686 lines
17 KiB
C++
686 lines
17 KiB
C++
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#include "stdafx.h"
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#pragma hdrstop
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/***************************************************************************
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*
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* INTEL Corporation Proprietary Information
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*
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*
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* Copyright (c) 1996 Intel Corporation.
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* All rights reserved.
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*
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***************************************************************************
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*/
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/*
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* jfdctint.c
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*
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* Copyright (C) 1991-1996, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains a slow-but-accurate integer implementation of the
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* forward DCT (Discrete Cosine Transform).
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*
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* A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT
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* on each column. Direct algorithms are also available, but they are
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* much more complex and seem not to be any faster when reduced to code.
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*
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* This implementation is based on an algorithm described in
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* C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT
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* Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics,
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* Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991.
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* The primary algorithm described there uses 11 multiplies and 29 adds.
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* We use their alternate method with 12 multiplies and 32 adds.
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* The advantage of this method is that no data path contains more than one
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* multiplication; this allows a very simple and accurate implementation in
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* scaled fixed-point arithmetic, with a minimal number of shifts.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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#include "jdct.h" /* Private declarations for DCT subsystem */
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#ifdef DCT_ISLOW_SUPPORTED
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/*
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* This module is specialized to the case DCTSIZE = 8.
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*/
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#if DCTSIZE != 8
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Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
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#endif
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/*
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* The poop on this scaling stuff is as follows:
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*
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* Each 1-D DCT step produces outputs which are a factor of sqrt(N)
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* larger than the true DCT outputs. The final outputs are therefore
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* a factor of N larger than desired; since N=8 this can be cured by
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* a simple right shift at the end of the algorithm. The advantage of
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* this arrangement is that we save two multiplications per 1-D DCT,
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* because the y0 and y4 outputs need not be divided by sqrt(N).
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* In the IJG code, this factor of 8 is removed by the quantization step
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* (in jcdctmgr.c), NOT in this module.
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*
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* We have to do addition and subtraction of the integer inputs, which
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* is no problem, and multiplication by fractional constants, which is
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* a problem to do in integer arithmetic. We multiply all the constants
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* by CONST_SCALE and convert them to integer constants (thus retaining
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* CONST_BITS bits of precision in the constants). After doing a
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* multiplication we have to divide the product by CONST_SCALE, with proper
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* rounding, to produce the correct output. This division can be done
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* cheaply as a right shift of CONST_BITS bits. We postpone shifting
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* as long as possible so that partial sums can be added together with
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* full fractional precision.
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*
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* The outputs of the first pass are scaled up by PASS1_BITS bits so that
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* they are represented to better-than-integral precision. These outputs
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* require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word
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* with the recommended scaling. (For 12-bit sample data, the intermediate
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* array is INT32 anyway.)
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*
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* To avoid overflow of the 32-bit intermediate results in pass 2, we must
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* have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis
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* shows that the values given below are the most effective.
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*/
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#if BITS_IN_JSAMPLE == 8
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#define CONST_BITS 13
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#define PASS1_BITS 2
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#else
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#define CONST_BITS 13
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#define PASS1_BITS 1 /* lose a little precision to avoid overflow */
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#endif
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/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
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* causing a lot of useless floating-point operations at run time.
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* To get around this we use the following pre-calculated constants.
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* If you change CONST_BITS you may want to add appropriate values.
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* (With a reasonable C compiler, you can just rely on the FIX() macro...)
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*/
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#if CONST_BITS == 13
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#define FIX_0_298631336 2446 /* FIX(0.298631336) */
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#define FIX_0_390180644 3196 /* FIX(0.390180644) */
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#define FIX_0_541196100 4433 /* FIX(0.541196100) */
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#define FIX_0_765366865 6270 /* FIX(0.765366865) */
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#define FIX_0_899976223 7373 /* FIX(0.899976223) */
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#define FIX_1_175875602 9633 /* FIX(1.175875602) */
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#define FIX_1_501321110 12299 /* FIX(1.501321110) */
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#define FIX_1_847759065 15137 /* FIX(1.847759065) */
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#define FIX_1_961570560 16069 /* FIX(1.961570560) */
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#define FIX_2_053119869 16819 /* FIX(2.053119869) */
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#define FIX_2_562915447 20995 /* FIX(2.562915447) */
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#define FIX_3_072711026 25172 /* FIX(3.072711026) */
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#else
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#define FIX_0_298631336 FIX(0.298631336)
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#define FIX_0_390180644 FIX(0.390180644)
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#define FIX_0_541196100 FIX(0.541196100)
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#define FIX_0_765366865 FIX(0.765366865)
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#define FIX_0_899976223 FIX(0.899976223)
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#define FIX_1_175875602 FIX(1.175875602)
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#define FIX_1_501321110 FIX(1.501321110)
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#define FIX_1_847759065 FIX(1.847759065)
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#define FIX_1_961570560 FIX(1.961570560)
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#define FIX_2_053119869 FIX(2.053119869)
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#define FIX_2_562915447 FIX(2.562915447)
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#define FIX_3_072711026 FIX(3.072711026)
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#endif
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/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
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* For 8-bit samples with the recommended scaling, all the variable
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* and constant values involved are no more than 16 bits wide, so a
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* 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
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* For 12-bit samples, a full 32-bit multiplication will be needed.
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*/
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#if BITS_IN_JSAMPLE == 8
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#define MULTIPLY(var,const) MULTIPLY16C16(var,const)
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#else
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#define MULTIPLY(var,const) ((var) * (const))
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#endif
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#define DATASIZE 4
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#define DCTWIDTH 32
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#if _MSC_FULL_VER >= 13008827 && defined(_M_IX86)
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#pragma warning(push)
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#pragma warning(disable:4731) // EBP modified with inline asm
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#endif
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/*
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* Perform the forward DCT on one block of samples.
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*/
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GLOBAL(void)
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pfdct8x8llm (DCTELEM * data)
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{
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INT32 tmp4, tmp5, tmp6, tmp7;
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int counter;
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__asm{
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/* Pass 1: process rows. */
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/* Note results are scaled up by sqrt(8) compared to a true DCT; */
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/* furthermore, we scale the results by 2**PASS1_BITS. */
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// dataptr = data;
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mov esi, [data]
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mov counter, 8
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// for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
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// tmp0 = dataptr[0] + dataptr[7];
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// tmp7 = dataptr[0] - dataptr[7];
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// tmp1 = dataptr[1] + dataptr[6];
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// tmp6 = dataptr[1] - dataptr[6];
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// tmp2 = dataptr[2] + dataptr[5];
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// tmp5 = dataptr[2] - dataptr[5];
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// tmp3 = dataptr[3] + dataptr[4];
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// tmp4 = dataptr[3] - dataptr[4];
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StartRow:
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mov eax, [esi][DATASIZE*0]
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mov ebx, [esi][DATASIZE*7]
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mov edx, eax
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add eax, ebx ; eax = tmp0
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sub edx, ebx ; edx = tmp7
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mov ebx, [esi][DATASIZE*3]
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mov ecx, [esi][DATASIZE*4]
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mov edi, ebx
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add ebx, ecx ; ebx = tmp3
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sub edi, ecx ; edi = tmp4
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mov tmp4, edi
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mov tmp7, edx
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/* Even part per LL&M figure 1 --- note that published figure is faulty;
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* rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
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*/
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// tmp10 = tmp0 + tmp3;
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// tmp13 = tmp0 - tmp3;
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// tmp11 = tmp1 + tmp2;
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// tmp12 = tmp1 - tmp2;
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mov ecx, eax
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add eax, ebx ; eax = tmp10
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sub ecx, ebx ; ecx = tmp13
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mov edx, [esi][DATASIZE*1]
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mov edi, [esi][DATASIZE*6]
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mov ebx, edx
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add edx, edi ; edx = tmp1
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sub ebx, edi ; ebx = tmp6
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mov tmp6, ebx
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push ebp
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mov edi, [esi][DATASIZE*2]
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mov ebp, [esi][DATASIZE*5]
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mov ebx, edi
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add edi, ebp ; edi = tmp2
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sub ebx, ebp ; ebx = tmp5
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mov ebp, edx
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add edx, edi ; edx = tmp11
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sub ebp, edi ; ebp = tmp12
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// dataptr[0] = (DCTELEM) ((tmp10 + tmp11) << PASS1_BITS);
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// dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << PASS1_BITS);
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mov edi, eax
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add eax, edx ; eax = tmp10 + tmp11
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shl eax, 2
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sub edi, edx ; edi = tmp10 - tmp11
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shl edi, 2
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mov [esi][DATASIZE*0], eax
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mov [esi][DATASIZE*4], edi
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mov eax, ebp ; eax = tmp12
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// z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
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add ebp, ecx ; eax = tmp12 + tmp13
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add esi, 32
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imul ebp, FIX_0_541196100 ; ebp = z1
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// dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
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// CONST_BITS-PASS1_BITS);
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imul ecx, FIX_0_765366865
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// dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
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// CONST_BITS-PASS1_BITS);
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imul eax, FIX_1_847759065
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add ecx, ebp ; add z1
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xor eax, 0xFFFFFFFF
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add ecx, 1024 ; rounding adj
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inc eax ; negate the result
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add eax, ebp ; add z1
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pop ebp
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sar ecx, 11
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add eax, 1024
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mov [esi][DATASIZE*2-32], ecx
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mov edi, tmp4
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sar eax, 11
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mov ecx, tmp6
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mov [esi][DATASIZE*6-32], eax
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push esi
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/* Odd part per figure 8 --- note paper omits factor of sqrt(2).
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* cK represents cos(K*pi/16).
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* i0..i3 in the paper are tmp4..tmp7 here.
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*/
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// z1 = tmp4 + tmp7;
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// z2 = tmp5 + tmp6;
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// z3 = tmp4 + tmp6;
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// z4 = tmp5 + tmp7;
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mov edx, tmp7
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mov eax, edi ; edi = eax = tmp4
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mov esi, edi ; esi = tmp4
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add edi, edx ; edi = z1
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add eax, ecx ; eax = z3
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add ecx, ebx ; ecx = z2
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// z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
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// z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
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imul edi, FIX_0_899976223
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imul ecx, FIX_2_562915447
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xor ecx, 0xFFFFFFFF
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add edx, ebx ; edx = z4
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// tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
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// tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
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imul esi, FIX_0_298631336
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imul ebx, FIX_2_053119869
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xor edi, 0xFFFFFFFF
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inc ecx ; ecx = z2
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inc edi ; edi = z1
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add ebx, ecx ; ebx = z2 + tmp5
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add esi, edi ; esi = z1 + tmp4
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mov tmp5, ebx
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// z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
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mov ebx, eax ; ebx = z3
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add eax, edx ; eax = z3 + z4
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imul eax, FIX_1_175875602
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// z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
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// z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
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imul ebx, FIX_1_961570560
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imul edx, FIX_0_390180644
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xor ebx, 0xFFFFFFFF
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|
xor edx, 0xFFFFFFFF
|
||
|
|
|
||
|
|
inc ebx ; ebx = z3
|
||
|
|
inc edx ; edx = z4
|
||
|
|
|
||
|
|
// z3 += z5;
|
||
|
|
// z4 += z5;
|
||
|
|
|
||
|
|
add ebx, eax ; ebx = z3
|
||
|
|
add edx, eax ; edx = z4
|
||
|
|
|
||
|
|
// tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
|
||
|
|
// tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
|
||
|
|
|
||
|
|
mov eax, tmp6
|
||
|
|
add ecx, ebx ; ecx = z2 + z3
|
||
|
|
|
||
|
|
imul eax, FIX_3_072711026
|
||
|
|
|
||
|
|
add ecx, eax ; ecx = tmp6 + z2 + z3
|
||
|
|
mov eax, tmp7
|
||
|
|
|
||
|
|
imul eax, FIX_1_501321110
|
||
|
|
|
||
|
|
// dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS);
|
||
|
|
// dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS);
|
||
|
|
// dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS);
|
||
|
|
// dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS);
|
||
|
|
|
||
|
|
add edi, edx ; edi = z1 + z4
|
||
|
|
add ecx, 1024
|
||
|
|
|
||
|
|
add edi, eax ; edi = tmp7 + z1 + z4
|
||
|
|
mov eax, tmp5 ; eax = tmp5 + z2
|
||
|
|
|
||
|
|
add ebx, esi ; ebx = tmp4 + z1 + z3
|
||
|
|
add edx, eax ; edx = tmp5 + z2 + z4
|
||
|
|
|
||
|
|
sar ecx, 11
|
||
|
|
add ebx, 1024
|
||
|
|
|
||
|
|
sar ebx, 11
|
||
|
|
pop esi
|
||
|
|
|
||
|
|
add edx, 1024
|
||
|
|
add edi, 1024
|
||
|
|
|
||
|
|
sar edx, 11
|
||
|
|
mov [esi][DATASIZE*7-32], ebx
|
||
|
|
|
||
|
|
sar edi, 11
|
||
|
|
mov [esi][DATASIZE*3-32], ecx
|
||
|
|
|
||
|
|
mov [esi][DATASIZE*5-32], edx
|
||
|
|
mov ecx, counter
|
||
|
|
|
||
|
|
mov [esi][DATASIZE*1-32], edi
|
||
|
|
dec ecx
|
||
|
|
|
||
|
|
mov counter, ecx
|
||
|
|
jnz StartRow
|
||
|
|
|
||
|
|
// dataptr += DCTSIZE; /* advance pointer to next row */
|
||
|
|
// }
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/* Pass 2: process columns.
|
||
|
|
* We remove the PASS1_BITS scaling, but leave the results scaled up
|
||
|
|
* by an overall factor of 8.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
// dataptr = data;
|
||
|
|
mov esi, [data]
|
||
|
|
|
||
|
|
mov counter, 8
|
||
|
|
|
||
|
|
//for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
|
||
|
|
// tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
|
||
|
|
// tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
|
||
|
|
// tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
|
||
|
|
// tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
|
||
|
|
// tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
|
||
|
|
// tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
|
||
|
|
// tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
|
||
|
|
// tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
|
||
|
|
|
||
|
|
StartCol:
|
||
|
|
mov eax, [esi][DCTWIDTH*0]
|
||
|
|
mov ebx, [esi][DCTWIDTH*7]
|
||
|
|
|
||
|
|
mov edx, eax
|
||
|
|
add eax, ebx ; eax = tmp0
|
||
|
|
|
||
|
|
sub edx, ebx ; edx = tmp7
|
||
|
|
mov ebx, [esi][DCTWIDTH*3]
|
||
|
|
|
||
|
|
mov ecx, [esi][DCTWIDTH*4]
|
||
|
|
mov edi, ebx
|
||
|
|
|
||
|
|
add ebx, ecx ; ebx = tmp3
|
||
|
|
sub edi, ecx ; edi = tmp4
|
||
|
|
|
||
|
|
mov tmp4, edi
|
||
|
|
mov tmp7, edx
|
||
|
|
|
||
|
|
/* Even part per LL&M figure 1 --- note that published figure is faulty;
|
||
|
|
* rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
|
||
|
|
*/
|
||
|
|
|
||
|
|
// tmp10 = tmp0 + tmp3;
|
||
|
|
// tmp13 = tmp0 - tmp3;
|
||
|
|
// tmp11 = tmp1 + tmp2;
|
||
|
|
// tmp12 = tmp1 - tmp2;
|
||
|
|
|
||
|
|
mov ecx, eax ; ecx = tmp0
|
||
|
|
add eax, ebx ; eax = tmp10
|
||
|
|
|
||
|
|
sub ecx, ebx ; ecx = tmp13
|
||
|
|
mov edx, [esi][DCTWIDTH*1]
|
||
|
|
|
||
|
|
mov edi, [esi][DCTWIDTH*6]
|
||
|
|
mov ebx, edx
|
||
|
|
|
||
|
|
add edx, edi ; edx = tmp1
|
||
|
|
sub ebx, edi ; ebx = tmp6
|
||
|
|
|
||
|
|
mov tmp6, ebx
|
||
|
|
push ebp
|
||
|
|
|
||
|
|
mov edi, [esi][DCTWIDTH*2]
|
||
|
|
mov ebp, [esi][DCTWIDTH*5]
|
||
|
|
|
||
|
|
mov ebx, edi
|
||
|
|
add edi, ebp ; edi = tmp2
|
||
|
|
|
||
|
|
sub ebx, ebp ; ebx = tmp5
|
||
|
|
mov ebp, edx ; ebp = tmp1
|
||
|
|
|
||
|
|
add edx, edi ; edx = tmp11
|
||
|
|
sub ebp, edi ; ebx = tmp12
|
||
|
|
|
||
|
|
// dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp11, PASS1_BITS);
|
||
|
|
// dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp10 - tmp11, PASS1_BITS);
|
||
|
|
|
||
|
|
add eax, 2 ; adj for rounding
|
||
|
|
|
||
|
|
mov edi, eax
|
||
|
|
add eax, edx ; eax = tmp10 + tmp11
|
||
|
|
|
||
|
|
sar eax, 2
|
||
|
|
sub edi, edx ; edi = tmp10 - tmp11
|
||
|
|
|
||
|
|
sar edi, 2
|
||
|
|
mov [esi][DCTWIDTH*0], eax
|
||
|
|
|
||
|
|
mov [esi][DCTWIDTH*4], edi
|
||
|
|
mov eax, ebp ; eax = tmp12
|
||
|
|
|
||
|
|
// z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
|
||
|
|
|
||
|
|
add ebp, ecx ; eax = tmp12 + tmp13
|
||
|
|
add esi, 4
|
||
|
|
|
||
|
|
imul ebp, FIX_0_541196100 ; ebp = z1
|
||
|
|
|
||
|
|
// dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
|
||
|
|
// CONST_BITS+PASS1_BITS);
|
||
|
|
|
||
|
|
imul ecx, FIX_0_765366865
|
||
|
|
|
||
|
|
// dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
|
||
|
|
// CONST_BITS+PASS1_BITS);
|
||
|
|
|
||
|
|
imul eax, FIX_1_847759065
|
||
|
|
|
||
|
|
add ecx, ebp ; add z1
|
||
|
|
xor eax, 0xFFFFFFFF
|
||
|
|
|
||
|
|
add ecx, 16384 ; rounding adj
|
||
|
|
inc eax ; negate the result
|
||
|
|
|
||
|
|
add eax, ebp ; add z1
|
||
|
|
pop ebp
|
||
|
|
|
||
|
|
sar ecx, 15
|
||
|
|
add eax, 16384
|
||
|
|
|
||
|
|
mov [esi][DCTWIDTH*2-4], ecx
|
||
|
|
mov edi, tmp4
|
||
|
|
|
||
|
|
sar eax, 15
|
||
|
|
mov ecx, tmp6
|
||
|
|
|
||
|
|
mov [esi][DCTWIDTH*6-4], eax
|
||
|
|
push esi
|
||
|
|
|
||
|
|
/* Odd part per figure 8 --- note paper omits factor of sqrt(2).
|
||
|
|
* cK represents cos(K*pi/16).
|
||
|
|
* i0..i3 in the paper are tmp4..tmp7 here.
|
||
|
|
*/
|
||
|
|
|
||
|
|
// z1 = tmp4 + tmp7;
|
||
|
|
// z2 = tmp5 + tmp6;
|
||
|
|
// z3 = tmp4 + tmp6;
|
||
|
|
// z4 = tmp5 + tmp7;
|
||
|
|
|
||
|
|
mov edx, tmp7
|
||
|
|
mov eax, edi ; edi = eax = tmp4
|
||
|
|
|
||
|
|
mov esi, edi ; esi = tmp4
|
||
|
|
add edi, edx ; edi = z1
|
||
|
|
|
||
|
|
add eax, ecx ; eax = z3
|
||
|
|
add ecx, ebx ; ecx = z2
|
||
|
|
|
||
|
|
// z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
|
||
|
|
// z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
|
||
|
|
|
||
|
|
imul edi, FIX_0_899976223
|
||
|
|
|
||
|
|
imul ecx, FIX_2_562915447
|
||
|
|
|
||
|
|
xor ecx, 0xFFFFFFFF
|
||
|
|
add edx, ebx ; edx = z4
|
||
|
|
|
||
|
|
// tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
|
||
|
|
// tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
|
||
|
|
|
||
|
|
imul esi, FIX_0_298631336
|
||
|
|
|
||
|
|
imul ebx, FIX_2_053119869
|
||
|
|
|
||
|
|
xor edi, 0xFFFFFFFF
|
||
|
|
inc ecx ; ecx = z2
|
||
|
|
|
||
|
|
inc edi ; edi = z1
|
||
|
|
add ebx, ecx ; ebx = z2 + tmp5
|
||
|
|
|
||
|
|
add esi, edi ; esi = z1 + tmp4
|
||
|
|
mov tmp5, ebx
|
||
|
|
|
||
|
|
// z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
|
||
|
|
|
||
|
|
mov ebx, eax ; ebx = z3
|
||
|
|
add eax, edx ; eax = z3 + z4
|
||
|
|
|
||
|
|
imul eax, FIX_1_175875602
|
||
|
|
|
||
|
|
// z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
|
||
|
|
// z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
|
||
|
|
|
||
|
|
imul ebx, FIX_1_961570560
|
||
|
|
|
||
|
|
imul edx, FIX_0_390180644
|
||
|
|
|
||
|
|
xor ebx, 0xFFFFFFFF
|
||
|
|
xor edx, 0xFFFFFFFF
|
||
|
|
|
||
|
|
inc ebx ; ebx = z3
|
||
|
|
inc edx ; edx = z4
|
||
|
|
|
||
|
|
// z3 += z5;
|
||
|
|
// z4 += z5;
|
||
|
|
|
||
|
|
add ebx, eax ; ebx = z3
|
||
|
|
add edx, eax ; edx = z4
|
||
|
|
|
||
|
|
// tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
|
||
|
|
// tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
|
||
|
|
|
||
|
|
mov eax, tmp6
|
||
|
|
add ecx, ebx ; ecx = z2 + z3
|
||
|
|
|
||
|
|
imul eax, FIX_3_072711026
|
||
|
|
|
||
|
|
add ecx, eax ; ecx = tmp6 + z2 + z3
|
||
|
|
mov eax, tmp7
|
||
|
|
|
||
|
|
imul eax, FIX_1_501321110
|
||
|
|
|
||
|
|
// dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp4 + z1 + z3,
|
||
|
|
// CONST_BITS+PASS1_BITS);
|
||
|
|
// dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp5 + z2 + z4,
|
||
|
|
// CONST_BITS+PASS1_BITS);
|
||
|
|
// dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp6 + z2 + z3,
|
||
|
|
// CONST_BITS+PASS1_BITS);
|
||
|
|
// dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp7 + z1 + z4,
|
||
|
|
// CONST_BITS+PASS1_BITS);
|
||
|
|
|
||
|
|
add edi, edx ; edi = z1 + z4
|
||
|
|
add ecx, 16384
|
||
|
|
|
||
|
|
add edi, eax ; edi = tmp7 + z1 + z4
|
||
|
|
mov eax, tmp5 ; eax = tmp5 + z2
|
||
|
|
|
||
|
|
add ebx, esi ; ebx = tmp4 + z1 + z3
|
||
|
|
add edx, eax ; edx = tmp5 + z2 + z4
|
||
|
|
|
||
|
|
sar ecx, 15
|
||
|
|
add ebx, 16384
|
||
|
|
|
||
|
|
sar ebx, 15
|
||
|
|
pop esi
|
||
|
|
|
||
|
|
add edx, 16384
|
||
|
|
add edi, 16384
|
||
|
|
|
||
|
|
sar edx, 15
|
||
|
|
mov [esi][DCTWIDTH*7-4], ebx
|
||
|
|
|
||
|
|
sar edi, 15
|
||
|
|
mov [esi][DCTWIDTH*3-4], ecx
|
||
|
|
|
||
|
|
mov [esi][DCTWIDTH*5-4], edx
|
||
|
|
mov ecx, counter
|
||
|
|
|
||
|
|
mov [esi][DCTWIDTH*1-4], edi
|
||
|
|
dec ecx
|
||
|
|
|
||
|
|
mov counter, ecx
|
||
|
|
jnz StartCol
|
||
|
|
} //end asm
|
||
|
|
|
||
|
|
// dataptr++; /* advance pointer to next column */
|
||
|
|
// }
|
||
|
|
}
|
||
|
|
|
||
|
|
#if _MSC_FULL_VER >= 13008827
|
||
|
|
#pragma warning(pop)
|
||
|
|
#endif
|
||
|
|
#endif /* DCT_ISLOW_SUPPORTED */
|