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jidctint.c

/*
 * jidctint.c
 *
 * Copyright (C) 1991-1998, Thomas G. Lane.
 * Modification developed 2002-2009 by Guido Vollbeding.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains a slow-but-accurate integer implementation of the
 * inverse DCT (Discrete Cosine Transform).  In the IJG code, this routine
 * must also perform dequantization of the input coefficients.
 *
 * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT
 * on each row (or vice versa, but it's more convenient to emit a row at
 * a time).  Direct algorithms are also available, but they are much more
 * complex and seem not to be any faster when reduced to code.
 *
 * This implementation is based on an algorithm described in
 *   C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT
 *   Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics,
 *   Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991.
 * The primary algorithm described there uses 11 multiplies and 29 adds.
 * We use their alternate method with 12 multiplies and 32 adds.
 * The advantage of this method is that no data path contains more than one
 * multiplication; this allows a very simple and accurate implementation in
 * scaled fixed-point arithmetic, with a minimal number of shifts.
 *
 * We also provide IDCT routines with various output sample block sizes for
 * direct resolution reduction or enlargement and for direct resolving the
 * common 2x1 and 1x2 subsampling cases without additional resampling: NxN
 * (N=1...16), 2NxN, and Nx2N (N=1...8) pixels for one 8x8 input DCT block.
 *
 * For N<8 we simply take the corresponding low-frequency coefficients of
 * the 8x8 input DCT block and apply an NxN point IDCT on the sub-block
 * to yield the downscaled outputs.
 * This can be seen as direct low-pass downsampling from the DCT domain
 * point of view rather than the usual spatial domain point of view,
 * yielding significant computational savings and results at least
 * as good as common bilinear (averaging) spatial downsampling.
 *
 * For N>8 we apply a partial NxN IDCT on the 8 input coefficients as
 * lower frequencies and higher frequencies assumed to be zero.
 * It turns out that the computational effort is similar to the 8x8 IDCT
 * regarding the output size.
 * Furthermore, the scaling and descaling is the same for all IDCT sizes.
 *
 * CAUTION: We rely on the FIX() macro except for the N=1,2,4,8 cases
 * since there would be too many additional constants to pre-calculate.
 */

#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jdct.h"       /* Private declarations for DCT subsystem */

#ifdef DCT_ISLOW_SUPPORTED


/*
 * This module is specialized to the case DCTSIZE = 8.
 */

#if DCTSIZE != 8
  Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */
#endif


/*
 * The poop on this scaling stuff is as follows:
 *
 * Each 1-D IDCT step produces outputs which are a factor of sqrt(N)
 * larger than the true IDCT outputs.  The final outputs are therefore
 * a factor of N larger than desired; since N=8 this can be cured by
 * a simple right shift at the end of the algorithm.  The advantage of
 * this arrangement is that we save two multiplications per 1-D IDCT,
 * because the y0 and y4 inputs need not be divided by sqrt(N).
 *
 * We have to do addition and subtraction of the integer inputs, which
 * is no problem, and multiplication by fractional constants, which is
 * a problem to do in integer arithmetic.  We multiply all the constants
 * by CONST_SCALE and convert them to integer constants (thus retaining
 * CONST_BITS bits of precision in the constants).  After doing a
 * multiplication we have to divide the product by CONST_SCALE, with proper
 * rounding, to produce the correct output.  This division can be done
 * cheaply as a right shift of CONST_BITS bits.  We postpone shifting
 * as long as possible so that partial sums can be added together with
 * full fractional precision.
 *
 * The outputs of the first pass are scaled up by PASS1_BITS bits so that
 * they are represented to better-than-integral precision.  These outputs
 * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word
 * with the recommended scaling.  (To scale up 12-bit sample data further, an
 * intermediate INT32 array would be needed.)
 *
 * To avoid overflow of the 32-bit intermediate results in pass 2, we must
 * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26.  Error analysis
 * shows that the values given below are the most effective.
 */

#if BITS_IN_JSAMPLE == 8
#define CONST_BITS  13
#define PASS1_BITS  2
#else
#define CONST_BITS  13
#define PASS1_BITS  1         /* lose a little precision to avoid overflow */
#endif

/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
 * causing a lot of useless floating-point operations at run time.
 * To get around this we use the following pre-calculated constants.
 * If you change CONST_BITS you may want to add appropriate values.
 * (With a reasonable C compiler, you can just rely on the FIX() macro...)
 */

#if CONST_BITS == 13
#define FIX_0_298631336  ((INT32)  2446)  /* FIX(0.298631336) */
#define FIX_0_390180644  ((INT32)  3196)  /* FIX(0.390180644) */
#define FIX_0_541196100  ((INT32)  4433)  /* FIX(0.541196100) */
#define FIX_0_765366865  ((INT32)  6270)  /* FIX(0.765366865) */
#define FIX_0_899976223  ((INT32)  7373)  /* FIX(0.899976223) */
#define FIX_1_175875602  ((INT32)  9633)  /* FIX(1.175875602) */
#define FIX_1_501321110  ((INT32)  12299) /* FIX(1.501321110) */
#define FIX_1_847759065  ((INT32)  15137) /* FIX(1.847759065) */
#define FIX_1_961570560  ((INT32)  16069) /* FIX(1.961570560) */
#define FIX_2_053119869  ((INT32)  16819) /* FIX(2.053119869) */
#define FIX_2_562915447  ((INT32)  20995) /* FIX(2.562915447) */
#define FIX_3_072711026  ((INT32)  25172) /* FIX(3.072711026) */
#else
#define FIX_0_298631336  FIX(0.298631336)
#define FIX_0_390180644  FIX(0.390180644)
#define FIX_0_541196100  FIX(0.541196100)
#define FIX_0_765366865  FIX(0.765366865)
#define FIX_0_899976223  FIX(0.899976223)
#define FIX_1_175875602  FIX(1.175875602)
#define FIX_1_501321110  FIX(1.501321110)
#define FIX_1_847759065  FIX(1.847759065)
#define FIX_1_961570560  FIX(1.961570560)
#define FIX_2_053119869  FIX(2.053119869)
#define FIX_2_562915447  FIX(2.562915447)
#define FIX_3_072711026  FIX(3.072711026)
#endif


/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
 * For 8-bit samples with the recommended scaling, all the variable
 * and constant values involved are no more than 16 bits wide, so a
 * 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
 * For 12-bit samples, a full 32-bit multiplication will be needed.
 */

#if BITS_IN_JSAMPLE == 8
#define MULTIPLY(var,const)  MULTIPLY16C16(var,const)
#else
#define MULTIPLY(var,const)  ((var) * (const))
#endif


/* Dequantize a coefficient by multiplying it by the multiplier-table
 * entry; produce an int result.  In this module, both inputs and result
 * are 16 bits or less, so either int or short multiply will work.
 */

#define DEQUANTIZE(coef,quantval)  (((ISLOW_MULT_TYPE) (coef)) * (quantval))


/*
 * Perform dequantization and inverse DCT on one block of coefficients.
 */

GLOBAL(void)
jpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3;
  INT32 tmp10, tmp11, tmp12, tmp13;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[DCTSIZE2];    /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */
  /* Note results are scaled up by sqrt(8) compared to a true IDCT; */
  /* furthermore, we scale the results by 2**PASS1_BITS. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = DCTSIZE; ctr > 0; ctr--) {
    /* Due to quantization, we will usually find that many of the input
     * coefficients are zero, especially the AC terms.  We can exploit this
     * by short-circuiting the IDCT calculation for any column in which all
     * the AC terms are zero.  In that case each output is equal to the
     * DC coefficient (with scale factor as needed).
     * With typical images and quantization tables, half or more of the
     * column DCT calculations can be simplified this way.
     */

    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
      inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 &&
      inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 &&
      inptr[DCTSIZE*7] == 0) {
      /* AC terms all zero */
      int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;

      wsptr[DCTSIZE*0] = dcval;
      wsptr[DCTSIZE*1] = dcval;
      wsptr[DCTSIZE*2] = dcval;
      wsptr[DCTSIZE*3] = dcval;
      wsptr[DCTSIZE*4] = dcval;
      wsptr[DCTSIZE*5] = dcval;
      wsptr[DCTSIZE*6] = dcval;
      wsptr[DCTSIZE*7] = dcval;

      inptr++;                /* advance pointers to next column */
      quantptr++;
      wsptr++;
      continue;
    }

    /* Even part: reverse the even part of the forward DCT. */
    /* The rotator is sqrt(2)*c(-6). */
    
    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
    tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865);
    tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065);

    z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z2 <<= CONST_BITS;
    z3 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z2 += ONE << (CONST_BITS-PASS1_BITS-1);

    tmp0 = z2 + z3;
    tmp1 = z2 - z3;

    tmp10 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;
    tmp11 = tmp1 + tmp3;
    tmp12 = tmp1 - tmp3;

    /* Odd part per figure 8; the matrix is unitary and hence its
     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
     */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
    tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    
    z2 = tmp0 + tmp2;
    z3 = tmp1 + tmp3;

    z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */
    z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
    z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
    z2 += z1;
    z3 += z1;

    z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
    tmp0 += z1 + z2;
    tmp3 += z1 + z3;

    z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
    tmp1 += z1 + z3;
    tmp2 += z1 + z2;

    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */

    wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS);
    
    inptr++;                  /* advance pointers to next column */
    quantptr++;
    wsptr++;
  }

  /* Pass 2: process rows from work array, store into output array. */
  /* Note that we must descale the results by a factor of 8 == 2**3, */
  /* and also undo the PASS1_BITS scaling. */

  wsptr = workspace;
  for (ctr = 0; ctr < DCTSIZE; ctr++) {
    outptr = output_buf[ctr] + output_col;
    /* Rows of zeroes can be exploited in the same way as we did with columns.
     * However, the column calculation has created many nonzero AC terms, so
     * the simplification applies less often (typically 5% to 10% of the time).
     * On machines with very fast multiplication, it's possible that the
     * test takes more time than it's worth.  In that case this section
     * may be commented out.
     */

#ifndef NO_ZERO_ROW_TEST
    if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 &&
      wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
      /* AC terms all zero */
      JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
                          & RANGE_MASK];

      outptr[0] = dcval;
      outptr[1] = dcval;
      outptr[2] = dcval;
      outptr[3] = dcval;
      outptr[4] = dcval;
      outptr[5] = dcval;
      outptr[6] = dcval;
      outptr[7] = dcval;

      wsptr += DCTSIZE;       /* advance pointer to next row */
      continue;
    }
#endif

    /* Even part: reverse the even part of the forward DCT. */
    /* The rotator is sqrt(2)*c(-6). */
    
    z2 = (INT32) wsptr[2];
    z3 = (INT32) wsptr[6];

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
    tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865);
    tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065);

    /* Add fudge factor here for final descale. */
    z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z3 = (INT32) wsptr[4];

    tmp0 = (z2 + z3) << CONST_BITS;
    tmp1 = (z2 - z3) << CONST_BITS;
    
    tmp10 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;
    tmp11 = tmp1 + tmp3;
    tmp12 = tmp1 - tmp3;

    /* Odd part per figure 8; the matrix is unitary and hence its
     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
     */

    tmp0 = (INT32) wsptr[7];
    tmp1 = (INT32) wsptr[5];
    tmp2 = (INT32) wsptr[3];
    tmp3 = (INT32) wsptr[1];

    z2 = tmp0 + tmp2;
    z3 = tmp1 + tmp3;

    z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */
    z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
    z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
    z2 += z1;
    z3 += z1;

    z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
    tmp0 += z1 + z2;
    tmp3 += z1 + z3;

    z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
    tmp1 += z1 + z3;
    tmp2 += z1 + z2;

    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += DCTSIZE;         /* advance pointer to next row */
  }
}

#ifdef IDCT_SCALING_SUPPORTED


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 7x7 output block.
 *
 * Optimized algorithm with 12 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/14).
 */

GLOBAL(void)
jpeg_idct_7x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12, tmp13;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[7*7];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp13 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp13 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp13 += ONE << (CONST_BITS-PASS1_BITS-1);

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734));     /* c4 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123));     /* c6 */
    tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */
    tmp0 = z1 + z3;
    z2 -= tmp0;
    tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */
    tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536));  /* c2-c4-c6 */
    tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249));  /* c2+c4+c6 */
    tmp13 += MULTIPLY(z2, FIX(1.414213562));         /* c0 */

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);

    tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347));      /* (c3+c1-c5)/2 */
    tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339));      /* (c3+c5-c1)/2 */
    tmp0 = tmp1 - tmp2;
    tmp1 += tmp2;
    tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276));    /* -c1 */
    tmp1 += tmp2;
    z2 = MULTIPLY(z1 + z3, FIX(0.613604268));        /* c5 */
    tmp0 += z2;
    tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693));     /* c3+c1-c5 */

    /* Final output stage */

    wsptr[7*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[7*6] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS);
    wsptr[7*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS);
    wsptr[7*5] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS);
    wsptr[7*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS);
    wsptr[7*4] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS);
    wsptr[7*3] = (int) RIGHT_SHIFT(tmp13, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 7 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 7; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp13 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp13 <<= CONST_BITS;

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[4];
    z3 = (INT32) wsptr[6];

    tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734));     /* c4 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123));     /* c6 */
    tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */
    tmp0 = z1 + z3;
    z2 -= tmp0;
    tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */
    tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536));  /* c2-c4-c6 */
    tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249));  /* c2+c4+c6 */
    tmp13 += MULTIPLY(z2, FIX(1.414213562));         /* c0 */

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];

    tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347));      /* (c3+c1-c5)/2 */
    tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339));      /* (c3+c5-c1)/2 */
    tmp0 = tmp1 - tmp2;
    tmp1 += tmp2;
    tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276));    /* -c1 */
    tmp1 += tmp2;
    z2 = MULTIPLY(z1 + z3, FIX(0.613604268));        /* c5 */
    tmp0 += z2;
    tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693));     /* c3+c1-c5 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 7;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 6x6 output block.
 *
 * Optimized algorithm with 3 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/12).
 */

GLOBAL(void)
jpeg_idct_6x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[6*6];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp0 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp0 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    tmp10 = MULTIPLY(tmp2, FIX(0.707106781));   /* c4 */
    tmp1 = tmp0 + tmp10;
    tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS);
    tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    tmp0 = MULTIPLY(tmp10, FIX(1.224744871));   /* c2 */
    tmp10 = tmp1 + tmp0;
    tmp12 = tmp1 - tmp0;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */
    tmp0 = tmp1 + ((z1 + z2) << CONST_BITS);
    tmp2 = tmp1 + ((z3 - z2) << CONST_BITS);
    tmp1 = (z1 - z2 - z3) << PASS1_BITS;

    /* Final output stage */

    wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[6*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS);
    wsptr[6*1] = (int) (tmp11 + tmp1);
    wsptr[6*4] = (int) (tmp11 - tmp1);
    wsptr[6*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS);
    wsptr[6*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 6 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 6; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp0 <<= CONST_BITS;
    tmp2 = (INT32) wsptr[4];
    tmp10 = MULTIPLY(tmp2, FIX(0.707106781));   /* c4 */
    tmp1 = tmp0 + tmp10;
    tmp11 = tmp0 - tmp10 - tmp10;
    tmp10 = (INT32) wsptr[2];
    tmp0 = MULTIPLY(tmp10, FIX(1.224744871));   /* c2 */
    tmp10 = tmp1 + tmp0;
    tmp12 = tmp1 - tmp0;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */
    tmp0 = tmp1 + ((z1 + z2) << CONST_BITS);
    tmp2 = tmp1 + ((z3 - z2) << CONST_BITS);
    tmp1 = (z1 - z2 - z3) << CONST_BITS;

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 6;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 5x5 output block.
 *
 * Optimized algorithm with 5 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/10).
 */

GLOBAL(void)
jpeg_idct_5x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp10, tmp11, tmp12;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[5*5];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp12 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp12 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp0 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    tmp1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */
    z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */
    z3 = tmp12 + z2;
    tmp10 = z3 + z1;
    tmp11 = z3 - z1;
    tmp12 -= z2 << 2;

    /* Odd part */

    z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));     /* c3 */
    tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148));   /* c1-c3 */
    tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899));   /* c1+c3 */

    /* Final output stage */

    wsptr[5*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[5*4] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS);
    wsptr[5*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS);
    wsptr[5*3] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS);
    wsptr[5*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 5 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 5; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp12 <<= CONST_BITS;
    tmp0 = (INT32) wsptr[2];
    tmp1 = (INT32) wsptr[4];
    z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */
    z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */
    z3 = tmp12 + z2;
    tmp10 = z3 + z1;
    tmp11 = z3 - z1;
    tmp12 -= z2 << 2;

    /* Odd part */

    z2 = (INT32) wsptr[1];
    z3 = (INT32) wsptr[3];

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));     /* c3 */
    tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148));   /* c1-c3 */
    tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899));   /* c1+c3 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 5;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 4x4 output block.
 *
 * Optimized algorithm with 3 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT].
 */

GLOBAL(void)
jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp2, tmp10, tmp12;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[4*4];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    
    tmp10 = (tmp0 + tmp2) << PASS1_BITS;
    tmp12 = (tmp0 - tmp2) << PASS1_BITS;

    /* Odd part */
    /* Same rotation as in the even part of the 8x8 LL&M IDCT */

    z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);               /* c6 */
    /* Add fudge factor here for final descale. */
    z1 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */
                   CONST_BITS-PASS1_BITS);
    tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */
                   CONST_BITS-PASS1_BITS);

    /* Final output stage */

    wsptr[4*0] = (int) (tmp10 + tmp0);
    wsptr[4*3] = (int) (tmp10 - tmp0);
    wsptr[4*1] = (int) (tmp12 + tmp2);
    wsptr[4*2] = (int) (tmp12 - tmp2);
  }

  /* Pass 2: process 4 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 4; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp2 = (INT32) wsptr[2];

    tmp10 = (tmp0 + tmp2) << CONST_BITS;
    tmp12 = (tmp0 - tmp2) << CONST_BITS;

    /* Odd part */
    /* Same rotation as in the even part of the 8x8 LL&M IDCT */

    z2 = (INT32) wsptr[1];
    z3 = (INT32) wsptr[3];

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);   /* c6 */
    tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */
    tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 4;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 3x3 output block.
 *
 * Optimized algorithm with 2 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/6).
 */

GLOBAL(void)
jpeg_idct_3x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp2, tmp10, tmp12;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[3*3];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp0 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp0 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */
    tmp10 = tmp0 + tmp12;
    tmp2 = tmp0 - tmp12 - tmp12;

    /* Odd part */

    tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */

    /* Final output stage */

    wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[3*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS);
    wsptr[3*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 3 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 3; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp0 <<= CONST_BITS;
    tmp2 = (INT32) wsptr[2];
    tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */
    tmp10 = tmp0 + tmp12;
    tmp2 = tmp0 - tmp12 - tmp12;

    /* Odd part */

    tmp12 = (INT32) wsptr[1];
    tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 3;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 2x2 output block.
 *
 * Multiplication-less algorithm.
 */

GLOBAL(void)
jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5;
  ISLOW_MULT_TYPE * quantptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  SHIFT_TEMPS

  /* Pass 1: process columns from input. */

  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;

  /* Column 0 */
  tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]);
  tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]);
  /* Add fudge factor here for final descale. */
  tmp4 += ONE << 2;

  tmp0 = tmp4 + tmp5;
  tmp2 = tmp4 - tmp5;

  /* Column 1 */
  tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0+1], quantptr[DCTSIZE*0+1]);
  tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1+1], quantptr[DCTSIZE*1+1]);

  tmp1 = tmp4 + tmp5;
  tmp3 = tmp4 - tmp5;

  /* Pass 2: process 2 rows, store into output array. */

  /* Row 0 */
  outptr = output_buf[0] + output_col;

  outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp0 + tmp1, 3) & RANGE_MASK];
  outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp0 - tmp1, 3) & RANGE_MASK];

  /* Row 1 */
  outptr = output_buf[1] + output_col;

  outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp2 + tmp3, 3) & RANGE_MASK];
  outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2 - tmp3, 3) & RANGE_MASK];
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 1x1 output block.
 *
 * We hardly need an inverse DCT routine for this: just take the
 * average pixel value, which is one-eighth of the DC coefficient.
 */

GLOBAL(void)
jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  int dcval;
  ISLOW_MULT_TYPE * quantptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  SHIFT_TEMPS

  /* 1x1 is trivial: just take the DC coefficient divided by 8. */
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  dcval = DEQUANTIZE(coef_block[0], quantptr[0]);
  dcval = (int) DESCALE((INT32) dcval, 3);

  output_buf[0][output_col] = range_limit[dcval & RANGE_MASK];
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 9x9 output block.
 *
 * Optimized algorithm with 10 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/18).
 */

GLOBAL(void)
jpeg_idct_9x9 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13, tmp14;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*9];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp0 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp0 += ONE << (CONST_BITS-PASS1_BITS-1);

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    tmp3 = MULTIPLY(z3, FIX(0.707106781));      /* c6 */
    tmp1 = tmp0 + tmp3;
    tmp2 = tmp0 - tmp3 - tmp3;

    tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */
    tmp11 = tmp2 + tmp0;
    tmp14 = tmp2 - tmp0 - tmp0;

    tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */
    tmp2 = MULTIPLY(z1, FIX(1.083350441));      /* c4 */
    tmp3 = MULTIPLY(z2, FIX(0.245575608));      /* c8 */

    tmp10 = tmp1 + tmp0 - tmp3;
    tmp12 = tmp1 - tmp0 + tmp2;
    tmp13 = tmp1 - tmp2 + tmp3;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    z2 = MULTIPLY(z2, - FIX(1.224744871));           /* -c3 */

    tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955));      /* c5 */
    tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525));      /* c7 */
    tmp0 = tmp2 + tmp3 - z2;
    tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481));      /* c1 */
    tmp2 += z2 - tmp1;
    tmp3 += z2 + tmp1;
    tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */

    /* Final output stage */

    wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[8*8] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS);
    wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS);
    wsptr[8*7] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS);
    wsptr[8*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS);
    wsptr[8*6] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS);
    wsptr[8*3] = (int) RIGHT_SHIFT(tmp13 + tmp3, CONST_BITS-PASS1_BITS);
    wsptr[8*5] = (int) RIGHT_SHIFT(tmp13 - tmp3, CONST_BITS-PASS1_BITS);
    wsptr[8*4] = (int) RIGHT_SHIFT(tmp14, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 9 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 9; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp0 <<= CONST_BITS;

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[4];
    z3 = (INT32) wsptr[6];

    tmp3 = MULTIPLY(z3, FIX(0.707106781));      /* c6 */
    tmp1 = tmp0 + tmp3;
    tmp2 = tmp0 - tmp3 - tmp3;

    tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */
    tmp11 = tmp2 + tmp0;
    tmp14 = tmp2 - tmp0 - tmp0;

    tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */
    tmp2 = MULTIPLY(z1, FIX(1.083350441));      /* c4 */
    tmp3 = MULTIPLY(z2, FIX(0.245575608));      /* c8 */

    tmp10 = tmp1 + tmp0 - tmp3;
    tmp12 = tmp1 - tmp0 + tmp2;
    tmp13 = tmp1 - tmp2 + tmp3;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];

    z2 = MULTIPLY(z2, - FIX(1.224744871));           /* -c3 */

    tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955));      /* c5 */
    tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525));      /* c7 */
    tmp0 = tmp2 + tmp3 - z2;
    tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481));      /* c1 */
    tmp2 += z2 - tmp1;
    tmp3 += z2 + tmp1;
    tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp14,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 10x10 output block.
 *
 * Optimized algorithm with 12 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/20).
 */

GLOBAL(void)
jpeg_idct_10x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24;
  INT32 z1, z2, z3, z4, z5;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*10];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z3 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z3 += ONE << (CONST_BITS-PASS1_BITS-1);
    z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z1 = MULTIPLY(z4, FIX(1.144122806));         /* c4 */
    z2 = MULTIPLY(z4, FIX(0.437016024));         /* c8 */
    tmp10 = z3 + z1;
    tmp11 = z3 - z2;

    tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1),   /* c0 = (c4-c8)*2 */
                  CONST_BITS-PASS1_BITS);

    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));    /* c6 */
    tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */
    tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */

    tmp20 = tmp10 + tmp12;
    tmp24 = tmp10 - tmp12;
    tmp21 = tmp11 + tmp13;
    tmp23 = tmp11 - tmp13;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = z2 + z4;
    tmp13 = z2 - z4;

    tmp12 = MULTIPLY(tmp13, FIX(0.309016994));        /* (c3-c7)/2 */
    z5 = z3 << CONST_BITS;

    z2 = MULTIPLY(tmp11, FIX(0.951056516));           /* (c3+c7)/2 */
    z4 = z5 + tmp12;

    tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */
    tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */

    z2 = MULTIPLY(tmp11, FIX(0.587785252));           /* (c1-c9)/2 */
    z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1));

    tmp12 = (z1 - tmp13 - z3) << PASS1_BITS;

    tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */
    tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */

    /* Final output stage */

    wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*2] = (int) (tmp22 + tmp12);
    wsptr[8*7] = (int) (tmp22 - tmp12);
    wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 10 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 10; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z3 <<= CONST_BITS;
    z4 = (INT32) wsptr[4];
    z1 = MULTIPLY(z4, FIX(1.144122806));         /* c4 */
    z2 = MULTIPLY(z4, FIX(0.437016024));         /* c8 */
    tmp10 = z3 + z1;
    tmp11 = z3 - z2;

    tmp22 = z3 - ((z1 - z2) << 1);               /* c0 = (c4-c8)*2 */

    z2 = (INT32) wsptr[2];
    z3 = (INT32) wsptr[6];

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));    /* c6 */
    tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */
    tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */

    tmp20 = tmp10 + tmp12;
    tmp24 = tmp10 - tmp12;
    tmp21 = tmp11 + tmp13;
    tmp23 = tmp11 - tmp13;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z3 <<= CONST_BITS;
    z4 = (INT32) wsptr[7];

    tmp11 = z2 + z4;
    tmp13 = z2 - z4;

    tmp12 = MULTIPLY(tmp13, FIX(0.309016994));        /* (c3-c7)/2 */

    z2 = MULTIPLY(tmp11, FIX(0.951056516));           /* (c3+c7)/2 */
    z4 = z3 + tmp12;

    tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */
    tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */

    z2 = MULTIPLY(tmp11, FIX(0.587785252));           /* (c1-c9)/2 */
    z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1));

    tmp12 = ((z1 - tmp13) << CONST_BITS) - z3;

    tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */
    tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 11x11 output block.
 *
 * Optimized algorithm with 24 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/22).
 */

GLOBAL(void)
jpeg_idct_11x11 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*11];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp10 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp10 += ONE << (CONST_BITS-PASS1_BITS-1);

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132));     /* c2+c4 */
    tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045));     /* c2-c6 */
    z4 = z1 + z3;
    tmp24 = MULTIPLY(z4, - FIX(1.155664402));        /* -(c2-c10) */
    z4 -= z2;
    tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976));  /* c2 */
    tmp21 = tmp20 + tmp23 + tmp25 -
          MULTIPLY(z2, FIX(1.821790775));          /* c2+c4+c10-c6 */
    tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */
    tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */
    tmp24 += tmp25;
    tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120));  /* c8+c10 */
    tmp24 += MULTIPLY(z2, FIX(1.944413522)) -        /* c2+c8 */
           MULTIPLY(z1, FIX(1.390975730));         /* c4+c10 */
    tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562));  /* c0 */

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = z1 + z2;
    tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */
    tmp11 = MULTIPLY(tmp11, FIX(0.887983902));           /* c3-c9 */
    tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295));         /* c5-c9 */
    tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */
    tmp10 = tmp11 + tmp12 + tmp13 -
          MULTIPLY(z1, FIX(0.923107866));              /* c7+c5+c3-c1-2*c9 */
    z1    = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */
    tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588));        /* c1+c7+3*c9-c3 */
    tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623));        /* c3+c5-c7-c9 */
    z1    = MULTIPLY(z2 + z4, - FIX(1.798248910));       /* -(c1+c9) */
    tmp11 += z1;
    tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632));        /* c1+c5+c9-c7 */
    tmp14 += MULTIPLY(z2, - FIX(1.467221301)) +          /* -(c5+c9) */
           MULTIPLY(z3, FIX(1.001388905)) -            /* c1-c9 */
           MULTIPLY(z4, FIX(1.684843907));             /* c3+c9 */

    /* Final output stage */

    wsptr[8*0]  = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*10] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1]  = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*9]  = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*2]  = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*8]  = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*3]  = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*7]  = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*4]  = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*6]  = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*5]  = (int) RIGHT_SHIFT(tmp25, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 11 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 11; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp10 <<= CONST_BITS;

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[4];
    z3 = (INT32) wsptr[6];

    tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132));     /* c2+c4 */
    tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045));     /* c2-c6 */
    z4 = z1 + z3;
    tmp24 = MULTIPLY(z4, - FIX(1.155664402));        /* -(c2-c10) */
    z4 -= z2;
    tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976));  /* c2 */
    tmp21 = tmp20 + tmp23 + tmp25 -
          MULTIPLY(z2, FIX(1.821790775));          /* c2+c4+c10-c6 */
    tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */
    tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */
    tmp24 += tmp25;
    tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120));  /* c8+c10 */
    tmp24 += MULTIPLY(z2, FIX(1.944413522)) -        /* c2+c8 */
           MULTIPLY(z1, FIX(1.390975730));         /* c4+c10 */
    tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562));  /* c0 */

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];

    tmp11 = z1 + z2;
    tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */
    tmp11 = MULTIPLY(tmp11, FIX(0.887983902));           /* c3-c9 */
    tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295));         /* c5-c9 */
    tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */
    tmp10 = tmp11 + tmp12 + tmp13 -
          MULTIPLY(z1, FIX(0.923107866));              /* c7+c5+c3-c1-2*c9 */
    z1    = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */
    tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588));        /* c1+c7+3*c9-c3 */
    tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623));        /* c3+c5-c7-c9 */
    z1    = MULTIPLY(z2 + z4, - FIX(1.798248910));       /* -(c1+c9) */
    tmp11 += z1;
    tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632));        /* c1+c5+c9-c7 */
    tmp14 += MULTIPLY(z2, - FIX(1.467221301)) +          /* -(c5+c9) */
           MULTIPLY(z3, FIX(1.001388905)) -            /* c1-c9 */
           MULTIPLY(z4, FIX(1.684843907));             /* c3+c9 */

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 12x12 output block.
 *
 * Optimized algorithm with 15 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/24).
 */

GLOBAL(void)
jpeg_idct_12x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*12];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z3 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z3 += ONE << (CONST_BITS-PASS1_BITS-1);

    z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */

    tmp10 = z3 + z4;
    tmp11 = z3 - z4;

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */
    z1 <<= CONST_BITS;
    z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
    z2 <<= CONST_BITS;

    tmp12 = z1 - z2;

    tmp21 = z3 + tmp12;
    tmp24 = z3 - tmp12;

    tmp12 = z4 + z2;

    tmp20 = tmp10 + tmp12;
    tmp25 = tmp10 - tmp12;

    tmp12 = z4 - z1 - z2;

    tmp22 = tmp11 + tmp12;
    tmp23 = tmp11 - tmp12;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = MULTIPLY(z2, FIX(1.306562965));                  /* c3 */
    tmp14 = MULTIPLY(z2, - FIX_0_541196100);                 /* -c9 */

    tmp10 = z1 + z3;
    tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669));          /* c7 */
    tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384));       /* c5-c7 */
    tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716));  /* c1-c5 */
    tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580));           /* -(c7+c11) */
    tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */
    tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */
    tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) -        /* c7-c11 */
           MULTIPLY(z4, FIX(1.982889723));                 /* c5+c7 */

    z1 -= z4;
    z2 -= z3;
    z3 = MULTIPLY(z1 + z2, FIX_0_541196100);                 /* c9 */
    tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865);              /* c3-c9 */
    tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065);              /* c3+c9 */

    /* Final output stage */

    wsptr[8*0]  = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1]  = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*2]  = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*9]  = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*3]  = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*8]  = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*4]  = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*7]  = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*5]  = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS);
    wsptr[8*6]  = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 12 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 12; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z3 <<= CONST_BITS;

    z4 = (INT32) wsptr[4];
    z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */

    tmp10 = z3 + z4;
    tmp11 = z3 - z4;

    z1 = (INT32) wsptr[2];
    z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */
    z1 <<= CONST_BITS;
    z2 = (INT32) wsptr[6];
    z2 <<= CONST_BITS;

    tmp12 = z1 - z2;

    tmp21 = z3 + tmp12;
    tmp24 = z3 - tmp12;

    tmp12 = z4 + z2;

    tmp20 = tmp10 + tmp12;
    tmp25 = tmp10 - tmp12;

    tmp12 = z4 - z1 - z2;

    tmp22 = tmp11 + tmp12;
    tmp23 = tmp11 - tmp12;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];

    tmp11 = MULTIPLY(z2, FIX(1.306562965));                  /* c3 */
    tmp14 = MULTIPLY(z2, - FIX_0_541196100);                 /* -c9 */

    tmp10 = z1 + z3;
    tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669));          /* c7 */
    tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384));       /* c5-c7 */
    tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716));  /* c1-c5 */
    tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580));           /* -(c7+c11) */
    tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */
    tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */
    tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) -        /* c7-c11 */
           MULTIPLY(z4, FIX(1.982889723));                 /* c5+c7 */

    z1 -= z4;
    z2 -= z3;
    z3 = MULTIPLY(z1 + z2, FIX_0_541196100);                 /* c9 */
    tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865);              /* c3-c9 */
    tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065);              /* c3+c9 */

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 13x13 output block.
 *
 * Optimized algorithm with 29 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/26).
 */

GLOBAL(void)
jpeg_idct_13x13 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*13];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z1 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z1 += ONE << (CONST_BITS-PASS1_BITS-1);

    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    tmp10 = z3 + z4;
    tmp11 = z3 - z4;

    tmp12 = MULTIPLY(tmp10, FIX(1.155388986));                /* (c4+c6)/2 */
    tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1;           /* (c4-c6)/2 */

    tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13;   /* c2 */
    tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13;   /* c10 */

    tmp12 = MULTIPLY(tmp10, FIX(0.316450131));                /* (c8-c12)/2 */
    tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1;           /* (c8+c12)/2 */

    tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13;   /* c6 */
    tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */

    tmp12 = MULTIPLY(tmp10, FIX(0.435816023));                /* (c2-c10)/2 */
    tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1;           /* (c2+c10)/2 */

    tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */
    tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */

    tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1;      /* c0 */

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651));     /* c3 */
    tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945));     /* c5 */
    tmp15 = z1 + z4;
    tmp13 = MULTIPLY(tmp15, FIX(0.937797057));       /* c7 */
    tmp10 = tmp11 + tmp12 + tmp13 -
          MULTIPLY(z1, FIX(2.020082300));          /* c7+c5+c3-c1 */
    tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458));   /* -c11 */
    tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */
    tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */
    tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945));   /* -c5 */
    tmp11 += tmp14;
    tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */
    tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813));   /* -c9 */
    tmp12 += tmp14;
    tmp13 += tmp14;
    tmp15 = MULTIPLY(tmp15, FIX(0.338443458));       /* c11 */
    tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */
          MULTIPLY(z2, FIX(0.466105296));          /* c1-c7 */
    z1    = MULTIPLY(z3 - z2, FIX(0.937797057));     /* c7 */
    tmp14 += z1;
    tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) -   /* c3-c7 */
           MULTIPLY(z4, FIX(1.742345811));         /* c1+c11 */

    /* Final output stage */

    wsptr[8*0]  = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*12] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1]  = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*11] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*2]  = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*10] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*3]  = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*9]  = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*4]  = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*8]  = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*5]  = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS);
    wsptr[8*7]  = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS);
    wsptr[8*6]  = (int) RIGHT_SHIFT(tmp26, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 13 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 13; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z1 <<= CONST_BITS;

    z2 = (INT32) wsptr[2];
    z3 = (INT32) wsptr[4];
    z4 = (INT32) wsptr[6];

    tmp10 = z3 + z4;
    tmp11 = z3 - z4;

    tmp12 = MULTIPLY(tmp10, FIX(1.155388986));                /* (c4+c6)/2 */
    tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1;           /* (c4-c6)/2 */

    tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13;   /* c2 */
    tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13;   /* c10 */

    tmp12 = MULTIPLY(tmp10, FIX(0.316450131));                /* (c8-c12)/2 */
    tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1;           /* (c8+c12)/2 */

    tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13;   /* c6 */
    tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */

    tmp12 = MULTIPLY(tmp10, FIX(0.435816023));                /* (c2-c10)/2 */
    tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1;           /* (c2+c10)/2 */

    tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */
    tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */

    tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1;      /* c0 */

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];

    tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651));     /* c3 */
    tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945));     /* c5 */
    tmp15 = z1 + z4;
    tmp13 = MULTIPLY(tmp15, FIX(0.937797057));       /* c7 */
    tmp10 = tmp11 + tmp12 + tmp13 -
          MULTIPLY(z1, FIX(2.020082300));          /* c7+c5+c3-c1 */
    tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458));   /* -c11 */
    tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */
    tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */
    tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945));   /* -c5 */
    tmp11 += tmp14;
    tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */
    tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813));   /* -c9 */
    tmp12 += tmp14;
    tmp13 += tmp14;
    tmp15 = MULTIPLY(tmp15, FIX(0.338443458));       /* c11 */
    tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */
          MULTIPLY(z2, FIX(0.466105296));          /* c1-c7 */
    z1    = MULTIPLY(z3 - z2, FIX(0.937797057));     /* c7 */
    tmp14 += z1;
    tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) -   /* c3-c7 */
           MULTIPLY(z4, FIX(1.742345811));         /* c1+c11 */

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp26,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 14x14 output block.
 *
 * Optimized algorithm with 20 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/28).
 */

GLOBAL(void)
jpeg_idct_14x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*14];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z1 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z1 += ONE << (CONST_BITS-PASS1_BITS-1);
    z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z2 = MULTIPLY(z4, FIX(1.274162392));         /* c4 */
    z3 = MULTIPLY(z4, FIX(0.314692123));         /* c12 */
    z4 = MULTIPLY(z4, FIX(0.881747734));         /* c8 */

    tmp10 = z1 + z2;
    tmp11 = z1 + z3;
    tmp12 = z1 - z4;

    tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */
                  CONST_BITS-PASS1_BITS);

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    z3 = MULTIPLY(z1 + z2, FIX(1.105676686));    /* c6 */

    tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */
    tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */
    tmp15 = MULTIPLY(z1, FIX(0.613604268)) -     /* c10 */
          MULTIPLY(z2, FIX(1.378756276));      /* c2 */

    tmp20 = tmp10 + tmp13;
    tmp26 = tmp10 - tmp13;
    tmp21 = tmp11 + tmp14;
    tmp25 = tmp11 - tmp14;
    tmp22 = tmp12 + tmp15;
    tmp24 = tmp12 - tmp15;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
    tmp13 = z4 << CONST_BITS;

    tmp14 = z1 + z3;
    tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607));           /* c3 */
    tmp12 = MULTIPLY(tmp14, FIX(1.197448846));             /* c5 */
    tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */
    tmp14 = MULTIPLY(tmp14, FIX(0.752406978));             /* c9 */
    tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426));        /* c9+c11-c13 */
    z1    -= z2;
    tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13;        /* c11 */
    tmp16 += tmp15;
    z1    += z4;
    z4    = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */
    tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948));          /* c3-c9-c13 */
    tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773));          /* c3+c5-c13 */
    z4    = MULTIPLY(z3 - z2, FIX(1.405321284));           /* c1 */
    tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */
    tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567));          /* c1+c11-c5 */

    tmp13 = (z1 - z3) << PASS1_BITS;

    /* Final output stage */

    wsptr[8*0]  = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1]  = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*2]  = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*3]  = (int) (tmp23 + tmp13);
    wsptr[8*10] = (int) (tmp23 - tmp13);
    wsptr[8*4]  = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*9]  = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*5]  = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS);
    wsptr[8*8]  = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS);
    wsptr[8*6]  = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS);
    wsptr[8*7]  = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 14 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 14; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z1 <<= CONST_BITS;
    z4 = (INT32) wsptr[4];
    z2 = MULTIPLY(z4, FIX(1.274162392));         /* c4 */
    z3 = MULTIPLY(z4, FIX(0.314692123));         /* c12 */
    z4 = MULTIPLY(z4, FIX(0.881747734));         /* c8 */

    tmp10 = z1 + z2;
    tmp11 = z1 + z3;
    tmp12 = z1 - z4;

    tmp23 = z1 - ((z2 + z3 - z4) << 1);          /* c0 = (c4+c12-c8)*2 */

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[6];

    z3 = MULTIPLY(z1 + z2, FIX(1.105676686));    /* c6 */

    tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */
    tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */
    tmp15 = MULTIPLY(z1, FIX(0.613604268)) -     /* c10 */
          MULTIPLY(z2, FIX(1.378756276));      /* c2 */

    tmp20 = tmp10 + tmp13;
    tmp26 = tmp10 - tmp13;
    tmp21 = tmp11 + tmp14;
    tmp25 = tmp11 - tmp14;
    tmp22 = tmp12 + tmp15;
    tmp24 = tmp12 - tmp15;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];
    z4 <<= CONST_BITS;

    tmp14 = z1 + z3;
    tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607));           /* c3 */
    tmp12 = MULTIPLY(tmp14, FIX(1.197448846));             /* c5 */
    tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */
    tmp14 = MULTIPLY(tmp14, FIX(0.752406978));             /* c9 */
    tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426));        /* c9+c11-c13 */
    z1    -= z2;
    tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4;           /* c11 */
    tmp16 += tmp15;
    tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4;    /* -c13 */
    tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948));       /* c3-c9-c13 */
    tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773));       /* c3+c5-c13 */
    tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284));           /* c1 */
    tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */
    tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567));       /* c1+c11-c5 */

    tmp13 = ((z1 - z3) << CONST_BITS) + z4;

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 15x15 output block.
 *
 * Optimized algorithm with 22 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/30).
 */

GLOBAL(void)
jpeg_idct_15x15 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*15];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z1 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z1 += ONE << (CONST_BITS-PASS1_BITS-1);

    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */
    tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */

    tmp12 = z1 - tmp10;
    tmp13 = z1 + tmp11;
    z1 -= (tmp11 - tmp10) << 1;             /* c0 = (c6-c12)*2 */

    z4 = z2 - z3;
    z3 += z2;
    tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */
    tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */
    z2 = MULTIPLY(z2, FIX(1.439773946));    /* c4+c14 */

    tmp20 = tmp13 + tmp10 + tmp11;
    tmp23 = tmp12 - tmp10 + tmp11 + z2;

    tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */
    tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */

    tmp25 = tmp13 - tmp10 - tmp11;
    tmp26 = tmp12 + tmp10 - tmp11 - z2;

    tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */
    tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */

    tmp21 = tmp12 + tmp10 + tmp11;
    tmp24 = tmp13 - tmp10 + tmp11;
    tmp11 += tmp11;
    tmp22 = z1 + tmp11;                     /* c10 = c6-c12 */
    tmp27 = z1 - tmp11 - tmp11;             /* c0 = (c6-c12)*2 */

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z3 = MULTIPLY(z4, FIX(1.224744871));                    /* c5 */
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp13 = z2 - z4;
    tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876));         /* c9 */
    tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148));         /* c3-c9 */
    tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899));      /* c3+c9 */

    tmp13 = MULTIPLY(z2, - FIX(0.831253876));               /* -c9 */
    tmp15 = MULTIPLY(z2, - FIX(1.344997024));               /* -c3 */
    z2 = z1 - z4;
    tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353));            /* c1 */

    tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */
    tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */
    tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3;            /* c5 */
    z2 = MULTIPLY(z1 + z4, FIX(0.575212477));               /* c11 */
    tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3;      /* c7-c11 */
    tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3;      /* c11+c13 */

    /* Final output stage */

    wsptr[8*0]  = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*14] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1]  = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*13] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*2]  = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*12] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*3]  = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*11] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*4]  = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*10] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*5]  = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS);
    wsptr[8*9]  = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS);
    wsptr[8*6]  = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS);
    wsptr[8*8]  = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS);
    wsptr[8*7]  = (int) RIGHT_SHIFT(tmp27, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 15 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 15; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z1 <<= CONST_BITS;

    z2 = (INT32) wsptr[2];
    z3 = (INT32) wsptr[4];
    z4 = (INT32) wsptr[6];

    tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */
    tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */

    tmp12 = z1 - tmp10;
    tmp13 = z1 + tmp11;
    z1 -= (tmp11 - tmp10) << 1;             /* c0 = (c6-c12)*2 */

    z4 = z2 - z3;
    z3 += z2;
    tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */
    tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */
    z2 = MULTIPLY(z2, FIX(1.439773946));    /* c4+c14 */

    tmp20 = tmp13 + tmp10 + tmp11;
    tmp23 = tmp12 - tmp10 + tmp11 + z2;

    tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */
    tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */

    tmp25 = tmp13 - tmp10 - tmp11;
    tmp26 = tmp12 + tmp10 - tmp11 - z2;

    tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */
    tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */

    tmp21 = tmp12 + tmp10 + tmp11;
    tmp24 = tmp13 - tmp10 + tmp11;
    tmp11 += tmp11;
    tmp22 = z1 + tmp11;                     /* c10 = c6-c12 */
    tmp27 = z1 - tmp11 - tmp11;             /* c0 = (c6-c12)*2 */

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z4 = (INT32) wsptr[5];
    z3 = MULTIPLY(z4, FIX(1.224744871));                    /* c5 */
    z4 = (INT32) wsptr[7];

    tmp13 = z2 - z4;
    tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876));         /* c9 */
    tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148));         /* c3-c9 */
    tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899));      /* c3+c9 */

    tmp13 = MULTIPLY(z2, - FIX(0.831253876));               /* -c9 */
    tmp15 = MULTIPLY(z2, - FIX(1.344997024));               /* -c3 */
    z2 = z1 - z4;
    tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353));            /* c1 */

    tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */
    tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */
    tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3;            /* c5 */
    z2 = MULTIPLY(z1 + z4, FIX(0.575212477));               /* c11 */
    tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3;      /* c7-c11 */
    tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3;      /* c11+c13 */

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp27,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 16x16 output block.
 *
 * Optimized algorithm with 28 multiplications in the 1-D kernel.
 * cK represents sqrt(2) * cos(K*pi/32).
 */

GLOBAL(void)
jpeg_idct_16x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*16];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp0 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp0 += 1 << (CONST_BITS-PASS1_BITS-1);

    z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    tmp1 = MULTIPLY(z1, FIX(1.306562965));      /* c4[16] = c2[8] */
    tmp2 = MULTIPLY(z1, FIX_0_541196100);       /* c12[16] = c6[8] */

    tmp10 = tmp0 + tmp1;
    tmp11 = tmp0 - tmp1;
    tmp12 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
    z3 = z1 - z2;
    z4 = MULTIPLY(z3, FIX(0.275899379));        /* c14[16] = c7[8] */
    z3 = MULTIPLY(z3, FIX(1.387039845));        /* c2[16] = c1[8] */

    tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447);  /* (c6+c2)[16] = (c3+c1)[8] */
    tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223);  /* (c6-c14)[16] = (c3-c7)[8] */
    tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */
    tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */

    tmp20 = tmp10 + tmp0;
    tmp27 = tmp10 - tmp0;
    tmp21 = tmp12 + tmp1;
    tmp26 = tmp12 - tmp1;
    tmp22 = tmp13 + tmp2;
    tmp25 = tmp13 - tmp2;
    tmp23 = tmp11 + tmp3;
    tmp24 = tmp11 - tmp3;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = z1 + z3;

    tmp1  = MULTIPLY(z1 + z2, FIX(1.353318001));   /* c3 */
    tmp2  = MULTIPLY(tmp11,   FIX(1.247225013));   /* c5 */
    tmp3  = MULTIPLY(z1 + z4, FIX(1.093201867));   /* c7 */
    tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586));   /* c9 */
    tmp11 = MULTIPLY(tmp11,   FIX(0.666655658));   /* c11 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528));   /* c13 */
    tmp0  = tmp1 + tmp2 + tmp3 -
          MULTIPLY(z1, FIX(2.286341144));        /* c7+c5+c3-c1 */
    tmp13 = tmp10 + tmp11 + tmp12 -
          MULTIPLY(z1, FIX(1.835730603));        /* c9+c11+c13-c15 */
    z1    = MULTIPLY(z2 + z3, FIX(0.138617169));   /* c15 */
    tmp1  += z1 + MULTIPLY(z2, FIX(0.071888074));  /* c9+c11-c3-c15 */
    tmp2  += z1 - MULTIPLY(z3, FIX(1.125726048));  /* c5+c7+c15-c3 */
    z1    = MULTIPLY(z3 - z2, FIX(1.407403738));   /* c1 */
    tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282));  /* c1+c11-c9-c13 */
    tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411));  /* c1+c5+c13-c7 */
    z2    += z4;
    z1    = MULTIPLY(z2, - FIX(0.666655658));      /* -c11 */
    tmp1  += z1;
    tmp3  += z1 + MULTIPLY(z4, FIX(1.065388962));  /* c3+c11+c15-c7 */
    z2    = MULTIPLY(z2, - FIX(1.247225013));      /* -c5 */
    tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809));  /* c1+c5+c9-c13 */
    tmp12 += z2;
    z2    = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */
    tmp2  += z2;
    tmp3  += z2;
    z2    = MULTIPLY(z4 - z3, FIX(0.410524528));   /* c13 */
    tmp10 += z2;
    tmp11 += z2;

    /* Final output stage */

    wsptr[8*0]  = (int) RIGHT_SHIFT(tmp20 + tmp0,  CONST_BITS-PASS1_BITS);
    wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0,  CONST_BITS-PASS1_BITS);
    wsptr[8*1]  = (int) RIGHT_SHIFT(tmp21 + tmp1,  CONST_BITS-PASS1_BITS);
    wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1,  CONST_BITS-PASS1_BITS);
    wsptr[8*2]  = (int) RIGHT_SHIFT(tmp22 + tmp2,  CONST_BITS-PASS1_BITS);
    wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2,  CONST_BITS-PASS1_BITS);
    wsptr[8*3]  = (int) RIGHT_SHIFT(tmp23 + tmp3,  CONST_BITS-PASS1_BITS);
    wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3,  CONST_BITS-PASS1_BITS);
    wsptr[8*4]  = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*5]  = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*6]  = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*9]  = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*7]  = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*8]  = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 16 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 16; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp0 <<= CONST_BITS;

    z1 = (INT32) wsptr[4];
    tmp1 = MULTIPLY(z1, FIX(1.306562965));      /* c4[16] = c2[8] */
    tmp2 = MULTIPLY(z1, FIX_0_541196100);       /* c12[16] = c6[8] */

    tmp10 = tmp0 + tmp1;
    tmp11 = tmp0 - tmp1;
    tmp12 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[6];
    z3 = z1 - z2;
    z4 = MULTIPLY(z3, FIX(0.275899379));        /* c14[16] = c7[8] */
    z3 = MULTIPLY(z3, FIX(1.387039845));        /* c2[16] = c1[8] */

    tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447);  /* (c6+c2)[16] = (c3+c1)[8] */
    tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223);  /* (c6-c14)[16] = (c3-c7)[8] */
    tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */
    tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */

    tmp20 = tmp10 + tmp0;
    tmp27 = tmp10 - tmp0;
    tmp21 = tmp12 + tmp1;
    tmp26 = tmp12 - tmp1;
    tmp22 = tmp13 + tmp2;
    tmp25 = tmp13 - tmp2;
    tmp23 = tmp11 + tmp3;
    tmp24 = tmp11 - tmp3;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];

    tmp11 = z1 + z3;

    tmp1  = MULTIPLY(z1 + z2, FIX(1.353318001));   /* c3 */
    tmp2  = MULTIPLY(tmp11,   FIX(1.247225013));   /* c5 */
    tmp3  = MULTIPLY(z1 + z4, FIX(1.093201867));   /* c7 */
    tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586));   /* c9 */
    tmp11 = MULTIPLY(tmp11,   FIX(0.666655658));   /* c11 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528));   /* c13 */
    tmp0  = tmp1 + tmp2 + tmp3 -
          MULTIPLY(z1, FIX(2.286341144));        /* c7+c5+c3-c1 */
    tmp13 = tmp10 + tmp11 + tmp12 -
          MULTIPLY(z1, FIX(1.835730603));        /* c9+c11+c13-c15 */
    z1    = MULTIPLY(z2 + z3, FIX(0.138617169));   /* c15 */
    tmp1  += z1 + MULTIPLY(z2, FIX(0.071888074));  /* c9+c11-c3-c15 */
    tmp2  += z1 - MULTIPLY(z3, FIX(1.125726048));  /* c5+c7+c15-c3 */
    z1    = MULTIPLY(z3 - z2, FIX(1.407403738));   /* c1 */
    tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282));  /* c1+c11-c9-c13 */
    tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411));  /* c1+c5+c13-c7 */
    z2    += z4;
    z1    = MULTIPLY(z2, - FIX(0.666655658));      /* -c11 */
    tmp1  += z1;
    tmp3  += z1 + MULTIPLY(z4, FIX(1.065388962));  /* c3+c11+c15-c7 */
    z2    = MULTIPLY(z2, - FIX(1.247225013));      /* -c5 */
    tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809));  /* c1+c5+c9-c13 */
    tmp12 += z2;
    z2    = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */
    tmp2  += z2;
    tmp3  += z2;
    z2    = MULTIPLY(z4 - z3, FIX(0.410524528));   /* c13 */
    tmp10 += z2;
    tmp11 += z2;

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 16x8 output block.
 *
 * 8-point IDCT in pass 1 (columns), 16-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_16x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*8];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */
  /* Note results are scaled up by sqrt(8) compared to a true IDCT; */
  /* furthermore, we scale the results by 2**PASS1_BITS. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = DCTSIZE; ctr > 0; ctr--) {
    /* Due to quantization, we will usually find that many of the input
     * coefficients are zero, especially the AC terms.  We can exploit this
     * by short-circuiting the IDCT calculation for any column in which all
     * the AC terms are zero.  In that case each output is equal to the
     * DC coefficient (with scale factor as needed).
     * With typical images and quantization tables, half or more of the
     * column DCT calculations can be simplified this way.
     */
    
    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
      inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 &&
      inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 &&
      inptr[DCTSIZE*7] == 0) {
      /* AC terms all zero */
      int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
      
      wsptr[DCTSIZE*0] = dcval;
      wsptr[DCTSIZE*1] = dcval;
      wsptr[DCTSIZE*2] = dcval;
      wsptr[DCTSIZE*3] = dcval;
      wsptr[DCTSIZE*4] = dcval;
      wsptr[DCTSIZE*5] = dcval;
      wsptr[DCTSIZE*6] = dcval;
      wsptr[DCTSIZE*7] = dcval;
      
      inptr++;                /* advance pointers to next column */
      quantptr++;
      wsptr++;
      continue;
    }
    
    /* Even part: reverse the even part of the forward DCT. */
    /* The rotator is sqrt(2)*c(-6). */
    
    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
    
    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
    tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865);
    tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065);
    
    z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z2 <<= CONST_BITS;
    z3 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z2 += ONE << (CONST_BITS-PASS1_BITS-1);

    tmp0 = z2 + z3;
    tmp1 = z2 - z3;
    
    tmp10 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;
    tmp11 = tmp1 + tmp3;
    tmp12 = tmp1 - tmp3;
    
    /* Odd part per figure 8; the matrix is unitary and hence its
     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
     */
    
    tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
    tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    
    z2 = tmp0 + tmp2;
    z3 = tmp1 + tmp3;

    z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */
    z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
    z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
    z2 += z1;
    z3 += z1;

    z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
    tmp0 += z1 + z2;
    tmp3 += z1 + z3;

    z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
    tmp1 += z1 + z3;
    tmp2 += z1 + z2;
    
    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
    
    wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS);
    
    inptr++;                  /* advance pointers to next column */
    quantptr++;
    wsptr++;
  }

  /* Pass 2: process 8 rows from work array, store into output array.
   * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp0 <<= CONST_BITS;

    z1 = (INT32) wsptr[4];
    tmp1 = MULTIPLY(z1, FIX(1.306562965));      /* c4[16] = c2[8] */
    tmp2 = MULTIPLY(z1, FIX_0_541196100);       /* c12[16] = c6[8] */

    tmp10 = tmp0 + tmp1;
    tmp11 = tmp0 - tmp1;
    tmp12 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[6];
    z3 = z1 - z2;
    z4 = MULTIPLY(z3, FIX(0.275899379));        /* c14[16] = c7[8] */
    z3 = MULTIPLY(z3, FIX(1.387039845));        /* c2[16] = c1[8] */

    tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447);  /* (c6+c2)[16] = (c3+c1)[8] */
    tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223);  /* (c6-c14)[16] = (c3-c7)[8] */
    tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */
    tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */

    tmp20 = tmp10 + tmp0;
    tmp27 = tmp10 - tmp0;
    tmp21 = tmp12 + tmp1;
    tmp26 = tmp12 - tmp1;
    tmp22 = tmp13 + tmp2;
    tmp25 = tmp13 - tmp2;
    tmp23 = tmp11 + tmp3;
    tmp24 = tmp11 - tmp3;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];

    tmp11 = z1 + z3;

    tmp1  = MULTIPLY(z1 + z2, FIX(1.353318001));   /* c3 */
    tmp2  = MULTIPLY(tmp11,   FIX(1.247225013));   /* c5 */
    tmp3  = MULTIPLY(z1 + z4, FIX(1.093201867));   /* c7 */
    tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586));   /* c9 */
    tmp11 = MULTIPLY(tmp11,   FIX(0.666655658));   /* c11 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528));   /* c13 */
    tmp0  = tmp1 + tmp2 + tmp3 -
          MULTIPLY(z1, FIX(2.286341144));        /* c7+c5+c3-c1 */
    tmp13 = tmp10 + tmp11 + tmp12 -
          MULTIPLY(z1, FIX(1.835730603));        /* c9+c11+c13-c15 */
    z1    = MULTIPLY(z2 + z3, FIX(0.138617169));   /* c15 */
    tmp1  += z1 + MULTIPLY(z2, FIX(0.071888074));  /* c9+c11-c3-c15 */
    tmp2  += z1 - MULTIPLY(z3, FIX(1.125726048));  /* c5+c7+c15-c3 */
    z1    = MULTIPLY(z3 - z2, FIX(1.407403738));   /* c1 */
    tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282));  /* c1+c11-c9-c13 */
    tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411));  /* c1+c5+c13-c7 */
    z2    += z4;
    z1    = MULTIPLY(z2, - FIX(0.666655658));      /* -c11 */
    tmp1  += z1;
    tmp3  += z1 + MULTIPLY(z4, FIX(1.065388962));  /* c3+c11+c15-c7 */
    z2    = MULTIPLY(z2, - FIX(1.247225013));      /* -c5 */
    tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809));  /* c1+c5+c9-c13 */
    tmp12 += z2;
    z2    = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */
    tmp2  += z2;
    tmp3  += z2;
    z2    = MULTIPLY(z4 - z3, FIX(0.410524528));   /* c13 */
    tmp10 += z2;
    tmp11 += z2;

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 14x7 output block.
 *
 * 7-point IDCT in pass 1 (columns), 14-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_14x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*7];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp23 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp23 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp23 += ONE << (CONST_BITS-PASS1_BITS-1);

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734));       /* c4 */
    tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123));       /* c6 */
    tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */
    tmp10 = z1 + z3;
    z2 -= tmp10;
    tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */
    tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536));   /* c2-c4-c6 */
    tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249));   /* c2+c4+c6 */
    tmp23 += MULTIPLY(z2, FIX(1.414213562));           /* c0 */

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);

    tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347));       /* (c3+c1-c5)/2 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339));       /* (c3+c5-c1)/2 */
    tmp10 = tmp11 - tmp12;
    tmp11 += tmp12;
    tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276));     /* -c1 */
    tmp11 += tmp12;
    z2 = MULTIPLY(z1 + z3, FIX(0.613604268));          /* c5 */
    tmp10 += z2;
    tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693));      /* c3+c1-c5 */

    /* Final output stage */

    wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*6] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*5] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*4] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*3] = (int) RIGHT_SHIFT(tmp23, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 7 rows from work array, store into output array.
   * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 7; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z1 <<= CONST_BITS;
    z4 = (INT32) wsptr[4];
    z2 = MULTIPLY(z4, FIX(1.274162392));         /* c4 */
    z3 = MULTIPLY(z4, FIX(0.314692123));         /* c12 */
    z4 = MULTIPLY(z4, FIX(0.881747734));         /* c8 */

    tmp10 = z1 + z2;
    tmp11 = z1 + z3;
    tmp12 = z1 - z4;

    tmp23 = z1 - ((z2 + z3 - z4) << 1);          /* c0 = (c4+c12-c8)*2 */

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[6];

    z3 = MULTIPLY(z1 + z2, FIX(1.105676686));    /* c6 */

    tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */
    tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */
    tmp15 = MULTIPLY(z1, FIX(0.613604268)) -     /* c10 */
          MULTIPLY(z2, FIX(1.378756276));      /* c2 */

    tmp20 = tmp10 + tmp13;
    tmp26 = tmp10 - tmp13;
    tmp21 = tmp11 + tmp14;
    tmp25 = tmp11 - tmp14;
    tmp22 = tmp12 + tmp15;
    tmp24 = tmp12 - tmp15;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];
    z4 <<= CONST_BITS;

    tmp14 = z1 + z3;
    tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607));           /* c3 */
    tmp12 = MULTIPLY(tmp14, FIX(1.197448846));             /* c5 */
    tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */
    tmp14 = MULTIPLY(tmp14, FIX(0.752406978));             /* c9 */
    tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426));        /* c9+c11-c13 */
    z1    -= z2;
    tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4;           /* c11 */
    tmp16 += tmp15;
    tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4;    /* -c13 */
    tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948));       /* c3-c9-c13 */
    tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773));       /* c3+c5-c13 */
    tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284));           /* c1 */
    tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */
    tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567));       /* c1+c11-c5 */

    tmp13 = ((z1 - z3) << CONST_BITS) + z4;

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 12x6 output block.
 *
 * 6-point IDCT in pass 1 (columns), 12-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_12x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*6];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp10 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp10 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp12 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    tmp20 = MULTIPLY(tmp12, FIX(0.707106781));   /* c4 */
    tmp11 = tmp10 + tmp20;
    tmp21 = RIGHT_SHIFT(tmp10 - tmp20 - tmp20, CONST_BITS-PASS1_BITS);
    tmp20 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    tmp10 = MULTIPLY(tmp20, FIX(1.224744871));   /* c2 */
    tmp20 = tmp11 + tmp10;
    tmp22 = tmp11 - tmp10;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */
    tmp10 = tmp11 + ((z1 + z2) << CONST_BITS);
    tmp12 = tmp11 + ((z3 - z2) << CONST_BITS);
    tmp11 = (z1 - z2 - z3) << PASS1_BITS;

    /* Final output stage */

    wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*5] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*1] = (int) (tmp21 + tmp11);
    wsptr[8*4] = (int) (tmp21 - tmp11);
    wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*3] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 6 rows from work array, store into output array.
   * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 6; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z3 <<= CONST_BITS;

    z4 = (INT32) wsptr[4];
    z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */

    tmp10 = z3 + z4;
    tmp11 = z3 - z4;

    z1 = (INT32) wsptr[2];
    z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */
    z1 <<= CONST_BITS;
    z2 = (INT32) wsptr[6];
    z2 <<= CONST_BITS;

    tmp12 = z1 - z2;

    tmp21 = z3 + tmp12;
    tmp24 = z3 - tmp12;

    tmp12 = z4 + z2;

    tmp20 = tmp10 + tmp12;
    tmp25 = tmp10 - tmp12;

    tmp12 = z4 - z1 - z2;

    tmp22 = tmp11 + tmp12;
    tmp23 = tmp11 - tmp12;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z4 = (INT32) wsptr[7];

    tmp11 = MULTIPLY(z2, FIX(1.306562965));                  /* c3 */
    tmp14 = MULTIPLY(z2, - FIX_0_541196100);                 /* -c9 */

    tmp10 = z1 + z3;
    tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669));          /* c7 */
    tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384));       /* c5-c7 */
    tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716));  /* c1-c5 */
    tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580));           /* -(c7+c11) */
    tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */
    tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */
    tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) -        /* c7-c11 */
           MULTIPLY(z4, FIX(1.982889723));                 /* c5+c7 */

    z1 -= z4;
    z2 -= z3;
    z3 = MULTIPLY(z1 + z2, FIX_0_541196100);                 /* c9 */
    tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865);              /* c3-c9 */
    tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065);              /* c3+c9 */

    /* Final output stage */

    outptr[0]  = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[1]  = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[2]  = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[9]  = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[3]  = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[8]  = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[4]  = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[7]  = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[5]  = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];
    outptr[6]  = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15,
                                     CONST_BITS+PASS1_BITS+3)
                       & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 10x5 output block.
 *
 * 5-point IDCT in pass 1 (columns), 10-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_10x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*5];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp12 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp12 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp13 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    tmp14 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */
    z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */
    z3 = tmp12 + z2;
    tmp10 = z3 + z1;
    tmp11 = z3 - z1;
    tmp12 -= z2 << 2;

    /* Odd part */

    z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));       /* c3 */
    tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148));    /* c1-c3 */
    tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899));    /* c1+c3 */

    /* Final output stage */

    wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*4] = (int) RIGHT_SHIFT(tmp10 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*3] = (int) RIGHT_SHIFT(tmp11 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[8*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 5 rows from work array, store into output array.
   * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 5; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z3 <<= CONST_BITS;
    z4 = (INT32) wsptr[4];
    z1 = MULTIPLY(z4, FIX(1.144122806));         /* c4 */
    z2 = MULTIPLY(z4, FIX(0.437016024));         /* c8 */
    tmp10 = z3 + z1;
    tmp11 = z3 - z2;

    tmp22 = z3 - ((z1 - z2) << 1);               /* c0 = (c4-c8)*2 */

    z2 = (INT32) wsptr[2];
    z3 = (INT32) wsptr[6];

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));    /* c6 */
    tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */
    tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */

    tmp20 = tmp10 + tmp12;
    tmp24 = tmp10 - tmp12;
    tmp21 = tmp11 + tmp13;
    tmp23 = tmp11 - tmp13;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    z3 <<= CONST_BITS;
    z4 = (INT32) wsptr[7];

    tmp11 = z2 + z4;
    tmp13 = z2 - z4;

    tmp12 = MULTIPLY(tmp13, FIX(0.309016994));        /* (c3-c7)/2 */

    z2 = MULTIPLY(tmp11, FIX(0.951056516));           /* (c3+c7)/2 */
    z4 = z3 + tmp12;

    tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */
    tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */

    z2 = MULTIPLY(tmp11, FIX(0.587785252));           /* (c1-c9)/2 */
    z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1));

    tmp12 = ((z1 - tmp13) << CONST_BITS) - z3;

    tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */
    tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 8;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 8x4 output block.
 *
 * 4-point IDCT in pass 1 (columns), 8-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_8x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3;
  INT32 tmp10, tmp11, tmp12, tmp13;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*4];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);

    tmp10 = (tmp0 + tmp2) << PASS1_BITS;
    tmp12 = (tmp0 - tmp2) << PASS1_BITS;

    /* Odd part */
    /* Same rotation as in the even part of the 8x8 LL&M IDCT */

    z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);               /* c6 */
    /* Add fudge factor here for final descale. */
    z1 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */
                   CONST_BITS-PASS1_BITS);
    tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */
                   CONST_BITS-PASS1_BITS);

    /* Final output stage */

    wsptr[8*0] = (int) (tmp10 + tmp0);
    wsptr[8*3] = (int) (tmp10 - tmp0);
    wsptr[8*1] = (int) (tmp12 + tmp2);
    wsptr[8*2] = (int) (tmp12 - tmp2);
  }

  /* Pass 2: process rows from work array, store into output array. */
  /* Note that we must descale the results by a factor of 8 == 2**3, */
  /* and also undo the PASS1_BITS scaling. */

  wsptr = workspace;
  for (ctr = 0; ctr < 4; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part: reverse the even part of the forward DCT. */
    /* The rotator is sqrt(2)*c(-6). */

    z2 = (INT32) wsptr[2];
    z3 = (INT32) wsptr[6];
    
    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
    tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865);
    tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065);
    
    /* Add fudge factor here for final descale. */
    z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z3 = (INT32) wsptr[4];
    
    tmp0 = (z2 + z3) << CONST_BITS;
    tmp1 = (z2 - z3) << CONST_BITS;
    
    tmp10 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;
    tmp11 = tmp1 + tmp3;
    tmp12 = tmp1 - tmp3;

    /* Odd part per figure 8; the matrix is unitary and hence its
     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
     */

    tmp0 = (INT32) wsptr[7];
    tmp1 = (INT32) wsptr[5];
    tmp2 = (INT32) wsptr[3];
    tmp3 = (INT32) wsptr[1];

    z2 = tmp0 + tmp2;
    z3 = tmp1 + tmp3;

    z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */
    z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
    z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
    z2 += z1;
    z3 += z1;

    z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
    tmp0 += z1 + z2;
    tmp3 += z1 + z3;

    z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
    tmp1 += z1 + z3;
    tmp2 += z1 + z2;

    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += DCTSIZE;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 6x3 output block.
 *
 * 3-point IDCT in pass 1 (columns), 6-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_6x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[6*3];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp0 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp0 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */
    tmp10 = tmp0 + tmp12;
    tmp2 = tmp0 - tmp12 - tmp12;

    /* Odd part */

    tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */

    /* Final output stage */

    wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[6*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS);
    wsptr[6*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS);
  }
  
  /* Pass 2: process 3 rows from work array, store into output array.
   * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 3; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp0 <<= CONST_BITS;
    tmp2 = (INT32) wsptr[4];
    tmp10 = MULTIPLY(tmp2, FIX(0.707106781));   /* c4 */
    tmp1 = tmp0 + tmp10;
    tmp11 = tmp0 - tmp10 - tmp10;
    tmp10 = (INT32) wsptr[2];
    tmp0 = MULTIPLY(tmp10, FIX(1.224744871));   /* c2 */
    tmp10 = tmp1 + tmp0;
    tmp12 = tmp1 - tmp0;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */
    tmp0 = tmp1 + ((z1 + z2) << CONST_BITS);
    tmp2 = tmp1 + ((z3 - z2) << CONST_BITS);
    tmp1 = (z1 - z2 - z3) << CONST_BITS;

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 6;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 4x2 output block.
 *
 * 2-point IDCT in pass 1 (columns), 4-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_4x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp2, tmp10, tmp12;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  INT32 * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  INT32 workspace[4*2]; /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);

    /* Odd part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);

    /* Final output stage */

    wsptr[4*0] = tmp10 + tmp0;
    wsptr[4*1] = tmp10 - tmp0;
  }

  /* Pass 2: process 2 rows from work array, store into output array.
   * 4-point IDCT kernel,
   * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT].
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 2; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = wsptr[0] + (ONE << 2);
    tmp2 = wsptr[2];

    tmp10 = (tmp0 + tmp2) << CONST_BITS;
    tmp12 = (tmp0 - tmp2) << CONST_BITS;

    /* Odd part */
    /* Same rotation as in the even part of the 8x8 LL&M IDCT */

    z2 = wsptr[1];
    z3 = wsptr[3];

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);   /* c6 */
    tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */
    tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2,
                                    CONST_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2,
                                    CONST_BITS+3)
                      & RANGE_MASK];

    wsptr += 4;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 2x1 output block.
 *
 * 1-point IDCT in pass 1 (columns), 2-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_2x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp10;
  ISLOW_MULT_TYPE * quantptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  SHIFT_TEMPS

  /* Pass 1: empty. */

  /* Pass 2: process 1 row from input, store into output array. */

  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  outptr = output_buf[0] + output_col;

  /* Even part */

  tmp10 = DEQUANTIZE(coef_block[0], quantptr[0]);
  /* Add fudge factor here for final descale. */
  tmp10 += ONE << 2;

  /* Odd part */

  tmp0 = DEQUANTIZE(coef_block[1], quantptr[1]);

  /* Final output stage */

  outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3) & RANGE_MASK];
  outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3) & RANGE_MASK];
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 8x16 output block.
 *
 * 16-point IDCT in pass 1 (columns), 8-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_8x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[8*16];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp0 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp0 += ONE << (CONST_BITS-PASS1_BITS-1);

    z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    tmp1 = MULTIPLY(z1, FIX(1.306562965));      /* c4[16] = c2[8] */
    tmp2 = MULTIPLY(z1, FIX_0_541196100);       /* c12[16] = c6[8] */

    tmp10 = tmp0 + tmp1;
    tmp11 = tmp0 - tmp1;
    tmp12 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
    z3 = z1 - z2;
    z4 = MULTIPLY(z3, FIX(0.275899379));        /* c14[16] = c7[8] */
    z3 = MULTIPLY(z3, FIX(1.387039845));        /* c2[16] = c1[8] */

    tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447);  /* (c6+c2)[16] = (c3+c1)[8] */
    tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223);  /* (c6-c14)[16] = (c3-c7)[8] */
    tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */
    tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */

    tmp20 = tmp10 + tmp0;
    tmp27 = tmp10 - tmp0;
    tmp21 = tmp12 + tmp1;
    tmp26 = tmp12 - tmp1;
    tmp22 = tmp13 + tmp2;
    tmp25 = tmp13 - tmp2;
    tmp23 = tmp11 + tmp3;
    tmp24 = tmp11 - tmp3;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = z1 + z3;

    tmp1  = MULTIPLY(z1 + z2, FIX(1.353318001));   /* c3 */
    tmp2  = MULTIPLY(tmp11,   FIX(1.247225013));   /* c5 */
    tmp3  = MULTIPLY(z1 + z4, FIX(1.093201867));   /* c7 */
    tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586));   /* c9 */
    tmp11 = MULTIPLY(tmp11,   FIX(0.666655658));   /* c11 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528));   /* c13 */
    tmp0  = tmp1 + tmp2 + tmp3 -
          MULTIPLY(z1, FIX(2.286341144));        /* c7+c5+c3-c1 */
    tmp13 = tmp10 + tmp11 + tmp12 -
          MULTIPLY(z1, FIX(1.835730603));        /* c9+c11+c13-c15 */
    z1    = MULTIPLY(z2 + z3, FIX(0.138617169));   /* c15 */
    tmp1  += z1 + MULTIPLY(z2, FIX(0.071888074));  /* c9+c11-c3-c15 */
    tmp2  += z1 - MULTIPLY(z3, FIX(1.125726048));  /* c5+c7+c15-c3 */
    z1    = MULTIPLY(z3 - z2, FIX(1.407403738));   /* c1 */
    tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282));  /* c1+c11-c9-c13 */
    tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411));  /* c1+c5+c13-c7 */
    z2    += z4;
    z1    = MULTIPLY(z2, - FIX(0.666655658));      /* -c11 */
    tmp1  += z1;
    tmp3  += z1 + MULTIPLY(z4, FIX(1.065388962));  /* c3+c11+c15-c7 */
    z2    = MULTIPLY(z2, - FIX(1.247225013));      /* -c5 */
    tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809));  /* c1+c5+c9-c13 */
    tmp12 += z2;
    z2    = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */
    tmp2  += z2;
    tmp3  += z2;
    z2    = MULTIPLY(z4 - z3, FIX(0.410524528));   /* c13 */
    tmp10 += z2;
    tmp11 += z2;

    /* Final output stage */

    wsptr[8*0]  = (int) RIGHT_SHIFT(tmp20 + tmp0,  CONST_BITS-PASS1_BITS);
    wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0,  CONST_BITS-PASS1_BITS);
    wsptr[8*1]  = (int) RIGHT_SHIFT(tmp21 + tmp1,  CONST_BITS-PASS1_BITS);
    wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1,  CONST_BITS-PASS1_BITS);
    wsptr[8*2]  = (int) RIGHT_SHIFT(tmp22 + tmp2,  CONST_BITS-PASS1_BITS);
    wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2,  CONST_BITS-PASS1_BITS);
    wsptr[8*3]  = (int) RIGHT_SHIFT(tmp23 + tmp3,  CONST_BITS-PASS1_BITS);
    wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3,  CONST_BITS-PASS1_BITS);
    wsptr[8*4]  = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[8*5]  = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[8*6]  = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*9]  = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[8*7]  = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[8*8]  = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS);
  }
  
  /* Pass 2: process rows from work array, store into output array. */
  /* Note that we must descale the results by a factor of 8 == 2**3, */
  /* and also undo the PASS1_BITS scaling. */

  wsptr = workspace;
  for (ctr = 0; ctr < 16; ctr++) {
    outptr = output_buf[ctr] + output_col;
    
    /* Even part: reverse the even part of the forward DCT. */
    /* The rotator is sqrt(2)*c(-6). */
    
    z2 = (INT32) wsptr[2];
    z3 = (INT32) wsptr[6];
    
    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
    tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865);
    tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065);
    
    /* Add fudge factor here for final descale. */
    z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    z3 = (INT32) wsptr[4];
    
    tmp0 = (z2 + z3) << CONST_BITS;
    tmp1 = (z2 - z3) << CONST_BITS;
    
    tmp10 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;
    tmp11 = tmp1 + tmp3;
    tmp12 = tmp1 - tmp3;
    
    /* Odd part per figure 8; the matrix is unitary and hence its
     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
     */
    
    tmp0 = (INT32) wsptr[7];
    tmp1 = (INT32) wsptr[5];
    tmp2 = (INT32) wsptr[3];
    tmp3 = (INT32) wsptr[1];
    
    z2 = tmp0 + tmp2;
    z3 = tmp1 + tmp3;

    z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */
    z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
    z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
    z2 += z1;
    z3 += z1;

    z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
    tmp0 += z1 + z2;
    tmp3 += z1 + z3;

    z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
    tmp1 += z1 + z3;
    tmp2 += z1 + z2;
    
    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
    
    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    
    wsptr += DCTSIZE;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 7x14 output block.
 *
 * 14-point IDCT in pass 1 (columns), 7-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_7x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[7*14];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z1 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z1 += ONE << (CONST_BITS-PASS1_BITS-1);
    z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z2 = MULTIPLY(z4, FIX(1.274162392));         /* c4 */
    z3 = MULTIPLY(z4, FIX(0.314692123));         /* c12 */
    z4 = MULTIPLY(z4, FIX(0.881747734));         /* c8 */

    tmp10 = z1 + z2;
    tmp11 = z1 + z3;
    tmp12 = z1 - z4;

    tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */
                  CONST_BITS-PASS1_BITS);

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    z3 = MULTIPLY(z1 + z2, FIX(1.105676686));    /* c6 */

    tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */
    tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */
    tmp15 = MULTIPLY(z1, FIX(0.613604268)) -     /* c10 */
          MULTIPLY(z2, FIX(1.378756276));      /* c2 */

    tmp20 = tmp10 + tmp13;
    tmp26 = tmp10 - tmp13;
    tmp21 = tmp11 + tmp14;
    tmp25 = tmp11 - tmp14;
    tmp22 = tmp12 + tmp15;
    tmp24 = tmp12 - tmp15;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
    tmp13 = z4 << CONST_BITS;

    tmp14 = z1 + z3;
    tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607));           /* c3 */
    tmp12 = MULTIPLY(tmp14, FIX(1.197448846));             /* c5 */
    tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */
    tmp14 = MULTIPLY(tmp14, FIX(0.752406978));             /* c9 */
    tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426));        /* c9+c11-c13 */
    z1    -= z2;
    tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13;        /* c11 */
    tmp16 += tmp15;
    z1    += z4;
    z4    = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */
    tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948));          /* c3-c9-c13 */
    tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773));          /* c3+c5-c13 */
    z4    = MULTIPLY(z3 - z2, FIX(1.405321284));           /* c1 */
    tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */
    tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567));          /* c1+c11-c5 */

    tmp13 = (z1 - z3) << PASS1_BITS;

    /* Final output stage */

    wsptr[7*0]  = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[7*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[7*1]  = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[7*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[7*2]  = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[7*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[7*3]  = (int) (tmp23 + tmp13);
    wsptr[7*10] = (int) (tmp23 - tmp13);
    wsptr[7*4]  = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[7*9]  = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[7*5]  = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS);
    wsptr[7*8]  = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS);
    wsptr[7*6]  = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS);
    wsptr[7*7]  = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 14 rows from work array, store into output array.
   * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 14; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp23 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp23 <<= CONST_BITS;

    z1 = (INT32) wsptr[2];
    z2 = (INT32) wsptr[4];
    z3 = (INT32) wsptr[6];

    tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734));       /* c4 */
    tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123));       /* c6 */
    tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */
    tmp10 = z1 + z3;
    z2 -= tmp10;
    tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */
    tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536));   /* c2-c4-c6 */
    tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249));   /* c2+c4+c6 */
    tmp23 += MULTIPLY(z2, FIX(1.414213562));           /* c0 */

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];

    tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347));       /* (c3+c1-c5)/2 */
    tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339));       /* (c3+c5-c1)/2 */
    tmp10 = tmp11 - tmp12;
    tmp11 += tmp12;
    tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276));     /* -c1 */
    tmp11 += tmp12;
    z2 = MULTIPLY(z1 + z3, FIX(0.613604268));          /* c5 */
    tmp10 += z2;
    tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693));      /* c3+c1-c5 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 7;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 6x12 output block.
 *
 * 12-point IDCT in pass 1 (columns), 6-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_6x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25;
  INT32 z1, z2, z3, z4;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[6*12];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z3 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z3 += ONE << (CONST_BITS-PASS1_BITS-1);

    z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */

    tmp10 = z3 + z4;
    tmp11 = z3 - z4;

    z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */
    z1 <<= CONST_BITS;
    z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
    z2 <<= CONST_BITS;

    tmp12 = z1 - z2;

    tmp21 = z3 + tmp12;
    tmp24 = z3 - tmp12;

    tmp12 = z4 + z2;

    tmp20 = tmp10 + tmp12;
    tmp25 = tmp10 - tmp12;

    tmp12 = z4 - z1 - z2;

    tmp22 = tmp11 + tmp12;
    tmp23 = tmp11 - tmp12;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = MULTIPLY(z2, FIX(1.306562965));                  /* c3 */
    tmp14 = MULTIPLY(z2, - FIX_0_541196100);                 /* -c9 */

    tmp10 = z1 + z3;
    tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669));          /* c7 */
    tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384));       /* c5-c7 */
    tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716));  /* c1-c5 */
    tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580));           /* -(c7+c11) */
    tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */
    tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */
    tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) -        /* c7-c11 */
           MULTIPLY(z4, FIX(1.982889723));                 /* c5+c7 */

    z1 -= z4;
    z2 -= z3;
    z3 = MULTIPLY(z1 + z2, FIX_0_541196100);                 /* c9 */
    tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865);              /* c3-c9 */
    tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065);              /* c3+c9 */

    /* Final output stage */

    wsptr[6*0]  = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[6*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[6*1]  = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[6*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[6*2]  = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS);
    wsptr[6*9]  = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS);
    wsptr[6*3]  = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[6*8]  = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[6*4]  = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[6*7]  = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
    wsptr[6*5]  = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS);
    wsptr[6*6]  = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 12 rows from work array, store into output array.
   * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 12; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp10 <<= CONST_BITS;
    tmp12 = (INT32) wsptr[4];
    tmp20 = MULTIPLY(tmp12, FIX(0.707106781));   /* c4 */
    tmp11 = tmp10 + tmp20;
    tmp21 = tmp10 - tmp20 - tmp20;
    tmp20 = (INT32) wsptr[2];
    tmp10 = MULTIPLY(tmp20, FIX(1.224744871));   /* c2 */
    tmp20 = tmp11 + tmp10;
    tmp22 = tmp11 - tmp10;

    /* Odd part */

    z1 = (INT32) wsptr[1];
    z2 = (INT32) wsptr[3];
    z3 = (INT32) wsptr[5];
    tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */
    tmp10 = tmp11 + ((z1 + z2) << CONST_BITS);
    tmp12 = tmp11 + ((z3 - z2) << CONST_BITS);
    tmp11 = (z1 - z2 - z3) << CONST_BITS;

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 6;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 5x10 output block.
 *
 * 10-point IDCT in pass 1 (columns), 5-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_5x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
            JCOEFPTR coef_block,
            JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp10, tmp11, tmp12, tmp13, tmp14;
  INT32 tmp20, tmp21, tmp22, tmp23, tmp24;
  INT32 z1, z2, z3, z4, z5;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[5*10];  /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z3 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z3 += ONE << (CONST_BITS-PASS1_BITS-1);
    z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z1 = MULTIPLY(z4, FIX(1.144122806));         /* c4 */
    z2 = MULTIPLY(z4, FIX(0.437016024));         /* c8 */
    tmp10 = z3 + z1;
    tmp11 = z3 - z2;

    tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1),   /* c0 = (c4-c8)*2 */
                  CONST_BITS-PASS1_BITS);

    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));    /* c6 */
    tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */
    tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */

    tmp20 = tmp10 + tmp12;
    tmp24 = tmp10 - tmp12;
    tmp21 = tmp11 + tmp13;
    tmp23 = tmp11 - tmp13;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);

    tmp11 = z2 + z4;
    tmp13 = z2 - z4;

    tmp12 = MULTIPLY(tmp13, FIX(0.309016994));        /* (c3-c7)/2 */
    z5 = z3 << CONST_BITS;

    z2 = MULTIPLY(tmp11, FIX(0.951056516));           /* (c3+c7)/2 */
    z4 = z5 + tmp12;

    tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */
    tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */

    z2 = MULTIPLY(tmp11, FIX(0.587785252));           /* (c1-c9)/2 */
    z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1));

    tmp12 = (z1 - tmp13 - z3) << PASS1_BITS;

    tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */
    tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */

    /* Final output stage */

    wsptr[5*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS);
    wsptr[5*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS);
    wsptr[5*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS);
    wsptr[5*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS);
    wsptr[5*2] = (int) (tmp22 + tmp12);
    wsptr[5*7] = (int) (tmp22 - tmp12);
    wsptr[5*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS);
    wsptr[5*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS);
    wsptr[5*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS);
    wsptr[5*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 10 rows from work array, store into output array.
   * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 10; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp12 <<= CONST_BITS;
    tmp13 = (INT32) wsptr[2];
    tmp14 = (INT32) wsptr[4];
    z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */
    z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */
    z3 = tmp12 + z2;
    tmp10 = z3 + z1;
    tmp11 = z3 - z1;
    tmp12 -= z2 << 2;

    /* Odd part */

    z2 = (INT32) wsptr[1];
    z3 = (INT32) wsptr[3];

    z1 = MULTIPLY(z2 + z3, FIX(0.831253876));       /* c3 */
    tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148));    /* c1-c3 */
    tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899));    /* c1+c3 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp13,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp13,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp14,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp14,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 5;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 4x8 output block.
 *
 * 8-point IDCT in pass 1 (columns), 4-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp3;
  INT32 tmp10, tmp11, tmp12, tmp13;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[4*8];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array. */
  /* Note results are scaled up by sqrt(8) compared to a true IDCT; */
  /* furthermore, we scale the results by 2**PASS1_BITS. */

  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 4; ctr > 0; ctr--) {
    /* Due to quantization, we will usually find that many of the input
     * coefficients are zero, especially the AC terms.  We can exploit this
     * by short-circuiting the IDCT calculation for any column in which all
     * the AC terms are zero.  In that case each output is equal to the
     * DC coefficient (with scale factor as needed).
     * With typical images and quantization tables, half or more of the
     * column DCT calculations can be simplified this way.
     */

    if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
      inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 &&
      inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 &&
      inptr[DCTSIZE*7] == 0) {
      /* AC terms all zero */
      int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;

      wsptr[4*0] = dcval;
      wsptr[4*1] = dcval;
      wsptr[4*2] = dcval;
      wsptr[4*3] = dcval;
      wsptr[4*4] = dcval;
      wsptr[4*5] = dcval;
      wsptr[4*6] = dcval;
      wsptr[4*7] = dcval;

      inptr++;                /* advance pointers to next column */
      quantptr++;
      wsptr++;
      continue;
    }

    /* Even part: reverse the even part of the forward DCT. */
    /* The rotator is sqrt(2)*c(-6). */

    z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
    
    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
    tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865);
    tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065);
    
    z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    z2 <<= CONST_BITS;
    z3 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    z2 += ONE << (CONST_BITS-PASS1_BITS-1);

    tmp0 = z2 + z3;
    tmp1 = z2 - z3;
    
    tmp10 = tmp0 + tmp2;
    tmp13 = tmp0 - tmp2;
    tmp11 = tmp1 + tmp3;
    tmp12 = tmp1 - tmp3;

    /* Odd part per figure 8; the matrix is unitary and hence its
     * transpose is its inverse.  i0..i3 are y7,y5,y3,y1 respectively.
     */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
    tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);

    z2 = tmp0 + tmp2;
    z3 = tmp1 + tmp3;

    z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */
    z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
    z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
    z2 += z1;
    z3 += z1;

    z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
    tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
    tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
    tmp0 += z1 + z2;
    tmp3 += z1 + z3;

    z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
    tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
    tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
    tmp1 += z1 + z3;
    tmp2 += z1 + z2;

    /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */

    wsptr[4*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
    wsptr[4*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
    wsptr[4*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
    wsptr[4*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
    wsptr[4*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
    wsptr[4*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
    wsptr[4*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[4*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS);

    inptr++;                  /* advance pointers to next column */
    quantptr++;
    wsptr++;
  }

  /* Pass 2: process 8 rows from work array, store into output array.
   * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 8; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp2 = (INT32) wsptr[2];

    tmp10 = (tmp0 + tmp2) << CONST_BITS;
    tmp12 = (tmp0 - tmp2) << CONST_BITS;

    /* Odd part */
    /* Same rotation as in the even part of the 8x8 LL&M IDCT */

    z2 = (INT32) wsptr[1];
    z3 = (INT32) wsptr[3];

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);   /* c6 */
    tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */
    tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    
    wsptr += 4;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a reduced-size 3x6 output block.
 *
 * 6-point IDCT in pass 1 (columns), 3-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_3x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  int * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  int workspace[3*6];   /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12).
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp0 <<= CONST_BITS;
    /* Add fudge factor here for final descale. */
    tmp0 += ONE << (CONST_BITS-PASS1_BITS-1);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
    tmp10 = MULTIPLY(tmp2, FIX(0.707106781));   /* c4 */
    tmp1 = tmp0 + tmp10;
    tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS);
    tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
    tmp0 = MULTIPLY(tmp10, FIX(1.224744871));   /* c2 */
    tmp10 = tmp1 + tmp0;
    tmp12 = tmp1 - tmp0;

    /* Odd part */

    z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
    tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */
    tmp0 = tmp1 + ((z1 + z2) << CONST_BITS);
    tmp2 = tmp1 + ((z3 - z2) << CONST_BITS);
    tmp1 = (z1 - z2 - z3) << PASS1_BITS;

    /* Final output stage */

    wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS);
    wsptr[3*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS);
    wsptr[3*1] = (int) (tmp11 + tmp1);
    wsptr[3*4] = (int) (tmp11 - tmp1);
    wsptr[3*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS);
    wsptr[3*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS);
  }

  /* Pass 2: process 6 rows from work array, store into output array.
   * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6).
   */
  wsptr = workspace;
  for (ctr = 0; ctr < 6; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2));
    tmp0 <<= CONST_BITS;
    tmp2 = (INT32) wsptr[2];
    tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */
    tmp10 = tmp0 + tmp12;
    tmp2 = tmp0 - tmp12 - tmp12;

    /* Odd part */

    tmp12 = (INT32) wsptr[1];
    tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2,
                                    CONST_BITS+PASS1_BITS+3)
                      & RANGE_MASK];

    wsptr += 3;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 2x4 output block.
 *
 * 4-point IDCT in pass 1 (columns), 2-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_2x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp2, tmp10, tmp12;
  INT32 z1, z2, z3;
  JCOEFPTR inptr;
  ISLOW_MULT_TYPE * quantptr;
  INT32 * wsptr;
  JSAMPROW outptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  int ctr;
  INT32 workspace[2*4]; /* buffers data between passes */
  SHIFT_TEMPS

  /* Pass 1: process columns from input, store into work array.
   * 4-point IDCT kernel,
   * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT].
   */
  inptr = coef_block;
  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
  wsptr = workspace;
  for (ctr = 0; ctr < 2; ctr++, inptr++, quantptr++, wsptr++) {
    /* Even part */

    tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
    tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);

    tmp10 = (tmp0 + tmp2) << CONST_BITS;
    tmp12 = (tmp0 - tmp2) << CONST_BITS;

    /* Odd part */
    /* Same rotation as in the even part of the 8x8 LL&M IDCT */

    z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
    z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);

    z1 = MULTIPLY(z2 + z3, FIX_0_541196100);   /* c6 */
    tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */
    tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */

    /* Final output stage */

    wsptr[2*0] = tmp10 + tmp0;
    wsptr[2*3] = tmp10 - tmp0;
    wsptr[2*1] = tmp12 + tmp2;
    wsptr[2*2] = tmp12 - tmp2;
  }

  /* Pass 2: process 4 rows from work array, store into output array. */

  wsptr = workspace;
  for (ctr = 0; ctr < 4; ctr++) {
    outptr = output_buf[ctr] + output_col;

    /* Even part */

    /* Add fudge factor here for final descale. */
    tmp10 = wsptr[0] + (ONE << (CONST_BITS+2));

    /* Odd part */

    tmp0 = wsptr[1];

    /* Final output stage */

    outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS+3)
                      & RANGE_MASK];
    outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS+3)
                      & RANGE_MASK];

    wsptr += 2;         /* advance pointer to next row */
  }
}


/*
 * Perform dequantization and inverse DCT on one block of coefficients,
 * producing a 1x2 output block.
 *
 * 2-point IDCT in pass 1 (columns), 1-point in pass 2 (rows).
 */

GLOBAL(void)
jpeg_idct_1x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
             JCOEFPTR coef_block,
             JSAMPARRAY output_buf, JDIMENSION output_col)
{
  INT32 tmp0, tmp10;
  ISLOW_MULT_TYPE * quantptr;
  JSAMPLE *range_limit = IDCT_range_limit(cinfo);
  SHIFT_TEMPS

  /* Process 1 column from input, store into output array. */

  quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;

  /* Even part */
    
  tmp10 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]);
  /* Add fudge factor here for final descale. */
  tmp10 += ONE << 2;

  /* Odd part */

  tmp0 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]);

  /* Final output stage */

  output_buf[0][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3)
                                & RANGE_MASK];
  output_buf[1][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3)
                                & RANGE_MASK];
}

#endif /* IDCT_SCALING_SUPPORTED */
#endif /* DCT_ISLOW_SUPPORTED */

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