X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftags%2Fsynfig_0_61_04%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fjrevdct.c;fp=synfig-core%2Ftags%2Fsynfig_0_61_04%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fjrevdct.c;h=0000000000000000000000000000000000000000;hb=6fa8f2f38d4b0b35f8539bf94e27ae27015c7689;hp=3bd78c1925115995148ec203d8d373c08258f162;hpb=47fce282611fbba1044921d22ca887f9b53ad91a;p=synfig.git diff --git a/synfig-core/tags/synfig_0_61_04/synfig-core/src/modules/mod_libavcodec/libavcodec/jrevdct.c b/synfig-core/tags/synfig_0_61_04/synfig-core/src/modules/mod_libavcodec/libavcodec/jrevdct.c deleted file mode 100644 index 3bd78c1..0000000 --- a/synfig-core/tags/synfig_0_61_04/synfig-core/src/modules/mod_libavcodec/libavcodec/jrevdct.c +++ /dev/null @@ -1,1176 +0,0 @@ -/* - * jrevdct.c - * - * Copyright (C) 1991, 1992, Thomas G. Lane. - * 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 the basic inverse-DCT transformation subroutine. - * - * 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. - * - * I've made lots of modifications to attempt to take advantage of the - * sparse nature of the DCT matrices we're getting. Although the logic - * is cumbersome, it's straightforward and the resulting code is much - * faster. - * - * A better way to do this would be to pass in the DCT block as a sparse - * matrix, perhaps with the difference cases encoded. - */ - -/** - * @file jrevdct.c - * Independent JPEG Group's LLM idct. - */ - -#include "common.h" -#include "dsputil.h" - -#define EIGHT_BIT_SAMPLES - -#define DCTSIZE 8 -#define DCTSIZE2 64 - -#define GLOBAL - -#define RIGHT_SHIFT(x, n) ((x) >> (n)) - -typedef DCTELEM DCTBLOCK[DCTSIZE2]; - -#define CONST_BITS 13 - -/* - * This routine is specialized to the case DCTSIZE = 8. - */ - -#if DCTSIZE != 8 - Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */ -#endif - - -/* - * A 2-D IDCT can be done by 1-D IDCT on each row followed by 1-D IDCT - * on each column. Direct algorithms are also available, but they are - * much more complex and seem not to be any faster when reduced to code. - * - * 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. - */ - -#ifdef EIGHT_BIT_SAMPLES -#define PASS1_BITS 2 -#else -#define PASS1_BITS 1 /* lose a little precision to avoid overflow */ -#endif - -#define ONE ((int32_t) 1) - -#define CONST_SCALE (ONE << CONST_BITS) - -/* Convert a positive real constant to an integer scaled by CONST_SCALE. - * IMPORTANT: if your compiler doesn't do this arithmetic at compile time, - * you will pay a significant penalty in run time. In that case, figure - * the correct integer constant values and insert them by hand. - */ - -/* Actually FIX is no longer used, we precomputed them all */ -#define FIX(x) ((int32_t) ((x) * CONST_SCALE + 0.5)) - -/* Descale and correctly round an int32_t value that's scaled by N bits. - * We assume RIGHT_SHIFT rounds towards minus infinity, so adding - * the fudge factor is correct for either sign of X. - */ - -#define DESCALE(x,n) RIGHT_SHIFT((x) + (ONE << ((n)-1)), n) - -/* Multiply an int32_t variable by an int32_t constant to yield an int32_t 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; - * this provides a useful speedup on many machines. - * There is no way to specify a 16x16->32 multiply in portable C, but - * some C compilers will do the right thing if you provide the correct - * combination of casts. - * NB: for 12-bit samples, a full 32-bit multiplication will be needed. - */ - -#ifdef EIGHT_BIT_SAMPLES -#ifdef SHORTxSHORT_32 /* may work if 'int' is 32 bits */ -#define MULTIPLY(var,const) (((int16_t) (var)) * ((int16_t) (const))) -#endif -#ifdef SHORTxLCONST_32 /* known to work with Microsoft C 6.0 */ -#define MULTIPLY(var,const) (((int16_t) (var)) * ((int32_t) (const))) -#endif -#endif - -#ifndef MULTIPLY /* default definition */ -#define MULTIPLY(var,const) ((var) * (const)) -#endif - - -/* - Unlike our decoder where we approximate the FIXes, we need to use exact -ones here or successive P-frames will drift too much with Reference frame coding -*/ -#define FIX_0_211164243 1730 -#define FIX_0_275899380 2260 -#define FIX_0_298631336 2446 -#define FIX_0_390180644 3196 -#define FIX_0_509795579 4176 -#define FIX_0_541196100 4433 -#define FIX_0_601344887 4926 -#define FIX_0_765366865 6270 -#define FIX_0_785694958 6436 -#define FIX_0_899976223 7373 -#define FIX_1_061594337 8697 -#define FIX_1_111140466 9102 -#define FIX_1_175875602 9633 -#define FIX_1_306562965 10703 -#define FIX_1_387039845 11363 -#define FIX_1_451774981 11893 -#define FIX_1_501321110 12299 -#define FIX_1_662939225 13623 -#define FIX_1_847759065 15137 -#define FIX_1_961570560 16069 -#define FIX_2_053119869 16819 -#define FIX_2_172734803 17799 -#define FIX_2_562915447 20995 -#define FIX_3_072711026 25172 - -/* - * Perform the inverse DCT on one block of coefficients. - */ - -void j_rev_dct(DCTBLOCK data) -{ - int32_t tmp0, tmp1, tmp2, tmp3; - int32_t tmp10, tmp11, tmp12, tmp13; - int32_t z1, z2, z3, z4, z5; - int32_t d0, d1, d2, d3, d4, d5, d6, d7; - register DCTELEM *dataptr; - int rowctr; - - /* Pass 1: process rows. */ - /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ - /* furthermore, we scale the results by 2**PASS1_BITS. */ - - dataptr = data; - - for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--) { - /* 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 row 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 - * row DCT calculations can be simplified this way. - */ - - register int *idataptr = (int*)dataptr; - - /* WARNING: we do the same permutation as MMX idct to simplify the - video core */ - d0 = dataptr[0]; - d2 = dataptr[1]; - d4 = dataptr[2]; - d6 = dataptr[3]; - d1 = dataptr[4]; - d3 = dataptr[5]; - d5 = dataptr[6]; - d7 = dataptr[7]; - - if ((d1 | d2 | d3 | d4 | d5 | d6 | d7) == 0) { - /* AC terms all zero */ - if (d0) { - /* Compute a 32 bit value to assign. */ - DCTELEM dcval = (DCTELEM) (d0 << PASS1_BITS); - register int v = (dcval & 0xffff) | ((dcval << 16) & 0xffff0000); - - idataptr[0] = v; - idataptr[1] = v; - idataptr[2] = v; - idataptr[3] = v; - } - - dataptr += DCTSIZE; /* advance pointer to next row */ - continue; - } - - /* Even part: reverse the even part of the forward DCT. */ - /* The rotator is sqrt(2)*c(-6). */ -{ - if (d6) { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } - } - } else { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = (d0 + d4) << CONST_BITS; - tmp11 = tmp12 = (d0 - d4) << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = d4 << CONST_BITS; - tmp11 = tmp12 = -tmp10; - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = 0; - } - } - } - } - - /* Odd part per figure 8; the matrix is unitary and hence its - * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. - */ - - if (d7) { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z2 = d5 + d3; - z3 = d7 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(z3 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */ - z2 = d5 + d3; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d5, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d5, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 = z1 + z4; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z4 = d5 + d1; - z5 = MULTIPLY(d7 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z3 = MULTIPLY(-d7, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 = z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z5 = MULTIPLY(d5 + d7, FIX_1_175875602); - - z3 += z5; - z4 += z5; - - tmp0 += z3; - tmp1 += z4; - tmp2 = z2 + z3; - tmp3 = z1 + z4; - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d1, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d1, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 = z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */ - z3 = d7 + d3; - - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - tmp2 = MULTIPLY(d3, FIX_0_509795579); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z5 = MULTIPLY(z3, FIX_1_175875602); - z3 = MULTIPLY(-z3, FIX_0_785694958); - - tmp0 += z3; - tmp1 = z2 + z5; - tmp2 += z3; - tmp3 = z1 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z5 = MULTIPLY(z1, FIX_1_175875602); - - z1 = MULTIPLY(z1, FIX_0_275899380); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp0 = MULTIPLY(-d7, FIX_1_662939225); - z4 = MULTIPLY(-d1, FIX_0_390180644); - tmp3 = MULTIPLY(d1, FIX_1_111140466); - - tmp0 += z1; - tmp1 = z4 + z5; - tmp2 = z3 + z5; - tmp3 += z1; - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_1_387039845); - tmp1 = MULTIPLY(d7, FIX_1_175875602); - tmp2 = MULTIPLY(-d7, FIX_0_785694958); - tmp3 = MULTIPLY(d7, FIX_0_275899380); - } - } - } - } else { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(d3 + z4, FIX_1_175875602); - - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-d1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-d3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 = z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - - z5 = MULTIPLY(z2, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_1_662939225); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z2 = MULTIPLY(-z2, FIX_1_387039845); - tmp2 = MULTIPLY(d3, FIX_1_111140466); - z3 = MULTIPLY(-d3, FIX_1_961570560); - - tmp0 = z3 + z5; - tmp1 += z2; - tmp2 += z2; - tmp3 = z4 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */ - z4 = d5 + d1; - - z5 = MULTIPLY(z4, FIX_1_175875602); - z1 = MULTIPLY(-d1, FIX_0_899976223); - tmp3 = MULTIPLY(d1, FIX_0_601344887); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(z4, FIX_0_785694958); - - tmp0 = z1 + z5; - tmp1 += z4; - tmp2 = z2 + z5; - tmp3 += z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */ - tmp0 = MULTIPLY(d5, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_0_275899380); - tmp2 = MULTIPLY(-d5, FIX_1_387039845); - tmp3 = MULTIPLY(d5, FIX_0_785694958); - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */ - z5 = d1 + d3; - tmp3 = MULTIPLY(d1, FIX_0_211164243); - tmp2 = MULTIPLY(-d3, FIX_1_451774981); - z1 = MULTIPLY(d1, FIX_1_061594337); - z2 = MULTIPLY(-d3, FIX_2_172734803); - z4 = MULTIPLY(z5, FIX_0_785694958); - z5 = MULTIPLY(z5, FIX_1_175875602); - - tmp0 = z1 - z4; - tmp1 = z2 + z4; - tmp2 += z5; - tmp3 += z5; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(-d3, FIX_0_785694958); - tmp1 = MULTIPLY(-d3, FIX_1_387039845); - tmp2 = MULTIPLY(-d3, FIX_0_275899380); - tmp3 = MULTIPLY(d3, FIX_1_175875602); - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(d1, FIX_0_275899380); - tmp1 = MULTIPLY(d1, FIX_0_785694958); - tmp2 = MULTIPLY(d1, FIX_1_175875602); - tmp3 = MULTIPLY(d1, FIX_1_387039845); - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = tmp1 = tmp2 = tmp3 = 0; - } - } - } - } -} - /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ - - dataptr[0] = (DCTELEM) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS); - dataptr[7] = (DCTELEM) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS); - dataptr[1] = (DCTELEM) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS); - dataptr[6] = (DCTELEM) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS); - dataptr[2] = (DCTELEM) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS); - dataptr[5] = (DCTELEM) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS); - dataptr[3] = (DCTELEM) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS); - dataptr[4] = (DCTELEM) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS); - - dataptr += DCTSIZE; /* advance pointer to next row */ - } - - /* Pass 2: process columns. */ - /* Note that we must descale the results by a factor of 8 == 2**3, */ - /* and also undo the PASS1_BITS scaling. */ - - dataptr = data; - for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--) { - /* Columns of zeroes can be exploited in the same way as we did with rows. - * However, the row 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. - */ - - d0 = dataptr[DCTSIZE*0]; - d1 = dataptr[DCTSIZE*1]; - d2 = dataptr[DCTSIZE*2]; - d3 = dataptr[DCTSIZE*3]; - d4 = dataptr[DCTSIZE*4]; - d5 = dataptr[DCTSIZE*5]; - d6 = dataptr[DCTSIZE*6]; - d7 = dataptr[DCTSIZE*7]; - - /* Even part: reverse the even part of the forward DCT. */ - /* The rotator is sqrt(2)*c(-6). */ - if (d6) { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } - } - } else { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = (d0 + d4) << CONST_BITS; - tmp11 = tmp12 = (d0 - d4) << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = d4 << CONST_BITS; - tmp11 = tmp12 = -tmp10; - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = 0; - } - } - } - } - - /* Odd part per figure 8; the matrix is unitary and hence its - * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. - */ - if (d7) { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z2 = d5 + d3; - z3 = d7 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(z3 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */ - z1 = d7; - z2 = d5 + d3; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d5, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d5, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 = z1 + z4; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z2 = d5; - z3 = d7; - z4 = d5 + d1; - z5 = MULTIPLY(z3 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z3 = MULTIPLY(-d7, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 = z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z5 = MULTIPLY(d5 + d7, FIX_1_175875602); - - z3 += z5; - z4 += z5; - - tmp0 += z3; - tmp1 += z4; - tmp2 = z2 + z3; - tmp3 = z1 + z4; - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d1, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d1, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 = z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */ - z3 = d7 + d3; - - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - tmp2 = MULTIPLY(d3, FIX_0_509795579); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z5 = MULTIPLY(z3, FIX_1_175875602); - z3 = MULTIPLY(-z3, FIX_0_785694958); - - tmp0 += z3; - tmp1 = z2 + z5; - tmp2 += z3; - tmp3 = z1 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z5 = MULTIPLY(z1, FIX_1_175875602); - - z1 = MULTIPLY(z1, FIX_0_275899380); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp0 = MULTIPLY(-d7, FIX_1_662939225); - z4 = MULTIPLY(-d1, FIX_0_390180644); - tmp3 = MULTIPLY(d1, FIX_1_111140466); - - tmp0 += z1; - tmp1 = z4 + z5; - tmp2 = z3 + z5; - tmp3 += z1; - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_1_387039845); - tmp1 = MULTIPLY(d7, FIX_1_175875602); - tmp2 = MULTIPLY(-d7, FIX_0_785694958); - tmp3 = MULTIPLY(d7, FIX_0_275899380); - } - } - } - } else { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(d3 + z4, FIX_1_175875602); - - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-d1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-d3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 = z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - - z5 = MULTIPLY(z2, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_1_662939225); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z2 = MULTIPLY(-z2, FIX_1_387039845); - tmp2 = MULTIPLY(d3, FIX_1_111140466); - z3 = MULTIPLY(-d3, FIX_1_961570560); - - tmp0 = z3 + z5; - tmp1 += z2; - tmp2 += z2; - tmp3 = z4 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */ - z4 = d5 + d1; - - z5 = MULTIPLY(z4, FIX_1_175875602); - z1 = MULTIPLY(-d1, FIX_0_899976223); - tmp3 = MULTIPLY(d1, FIX_0_601344887); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(z4, FIX_0_785694958); - - tmp0 = z1 + z5; - tmp1 += z4; - tmp2 = z2 + z5; - tmp3 += z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */ - tmp0 = MULTIPLY(d5, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_0_275899380); - tmp2 = MULTIPLY(-d5, FIX_1_387039845); - tmp3 = MULTIPLY(d5, FIX_0_785694958); - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */ - z5 = d1 + d3; - tmp3 = MULTIPLY(d1, FIX_0_211164243); - tmp2 = MULTIPLY(-d3, FIX_1_451774981); - z1 = MULTIPLY(d1, FIX_1_061594337); - z2 = MULTIPLY(-d3, FIX_2_172734803); - z4 = MULTIPLY(z5, FIX_0_785694958); - z5 = MULTIPLY(z5, FIX_1_175875602); - - tmp0 = z1 - z4; - tmp1 = z2 + z4; - tmp2 += z5; - tmp3 += z5; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(-d3, FIX_0_785694958); - tmp1 = MULTIPLY(-d3, FIX_1_387039845); - tmp2 = MULTIPLY(-d3, FIX_0_275899380); - tmp3 = MULTIPLY(d3, FIX_1_175875602); - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(d1, FIX_0_275899380); - tmp1 = MULTIPLY(d1, FIX_0_785694958); - tmp2 = MULTIPLY(d1, FIX_1_175875602); - tmp3 = MULTIPLY(d1, FIX_1_387039845); - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = tmp1 = tmp2 = tmp3 = 0; - } - } - } - } - - /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ - - dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp3, - CONST_BITS+PASS1_BITS+3); - dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp10 - tmp3, - CONST_BITS+PASS1_BITS+3); - dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp11 + tmp2, - CONST_BITS+PASS1_BITS+3); - dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(tmp11 - tmp2, - CONST_BITS+PASS1_BITS+3); - dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(tmp12 + tmp1, - CONST_BITS+PASS1_BITS+3); - dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp12 - tmp1, - CONST_BITS+PASS1_BITS+3); - dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp13 + tmp0, - CONST_BITS+PASS1_BITS+3); - dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp13 - tmp0, - CONST_BITS+PASS1_BITS+3); - - dataptr++; /* advance pointer to next column */ - } -} - -#undef FIX -#undef CONST_BITS