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4991ef2f9d
Also includes the fix for upstream issue #288 to avoid crashes on some older Win7 systems. Differential Revision: https://phabricator.services.mozilla.com/D7758 --HG-- rename : media/libjpeg/simd/jsimd_arm.c => media/libjpeg/simd/arm/jsimd.c rename : media/libjpeg/simd/jsimd_arm_neon.S => media/libjpeg/simd/arm/jsimd_neon.S rename : media/libjpeg/simd/jsimd_arm64.c => media/libjpeg/simd/arm64/jsimd.c rename : media/libjpeg/simd/jsimd_arm64_neon.S => media/libjpeg/simd/arm64/jsimd_neon.S rename : media/libjpeg/simd/jccolext-mmx.asm => media/libjpeg/simd/i386/jccolext-mmx.asm rename : media/libjpeg/simd/jccolext-sse2.asm => media/libjpeg/simd/i386/jccolext-sse2.asm rename : media/libjpeg/simd/jccolor-mmx.asm => media/libjpeg/simd/i386/jccolor-mmx.asm rename : media/libjpeg/simd/jccolor-sse2.asm => media/libjpeg/simd/i386/jccolor-sse2.asm rename : media/libjpeg/simd/jcgray-mmx.asm => media/libjpeg/simd/i386/jcgray-mmx.asm rename : media/libjpeg/simd/jcgray-sse2.asm => media/libjpeg/simd/i386/jcgray-sse2.asm rename : media/libjpeg/simd/jcgryext-mmx.asm => media/libjpeg/simd/i386/jcgryext-mmx.asm rename : media/libjpeg/simd/jcgryext-sse2.asm => media/libjpeg/simd/i386/jcgryext-sse2.asm rename : media/libjpeg/simd/jchuff-sse2.asm => media/libjpeg/simd/i386/jchuff-sse2.asm rename : media/libjpeg/simd/jcsample-mmx.asm => media/libjpeg/simd/i386/jcsample-mmx.asm rename : media/libjpeg/simd/jcsample-sse2.asm => media/libjpeg/simd/i386/jcsample-sse2.asm rename : media/libjpeg/simd/jdcolext-mmx.asm => media/libjpeg/simd/i386/jdcolext-mmx.asm rename : media/libjpeg/simd/jdcolext-sse2.asm => media/libjpeg/simd/i386/jdcolext-sse2.asm rename : media/libjpeg/simd/jdcolor-mmx.asm => media/libjpeg/simd/i386/jdcolor-mmx.asm rename : media/libjpeg/simd/jdcolor-sse2.asm => media/libjpeg/simd/i386/jdcolor-sse2.asm rename : media/libjpeg/simd/jdmerge-mmx.asm => media/libjpeg/simd/i386/jdmerge-mmx.asm rename : media/libjpeg/simd/jdmerge-sse2.asm => media/libjpeg/simd/i386/jdmerge-sse2.asm rename : media/libjpeg/simd/jdmrgext-mmx.asm => media/libjpeg/simd/i386/jdmrgext-mmx.asm rename : media/libjpeg/simd/jdmrgext-sse2.asm => media/libjpeg/simd/i386/jdmrgext-sse2.asm rename : media/libjpeg/simd/jdsample-mmx.asm => media/libjpeg/simd/i386/jdsample-mmx.asm rename : media/libjpeg/simd/jdsample-sse2.asm => media/libjpeg/simd/i386/jdsample-sse2.asm rename : media/libjpeg/simd/jfdctflt-3dn.asm => media/libjpeg/simd/i386/jfdctflt-3dn.asm rename : media/libjpeg/simd/jfdctflt-sse.asm => media/libjpeg/simd/i386/jfdctflt-sse.asm rename : media/libjpeg/simd/jfdctfst-mmx.asm => media/libjpeg/simd/i386/jfdctfst-mmx.asm rename : media/libjpeg/simd/jfdctfst-sse2.asm => media/libjpeg/simd/i386/jfdctfst-sse2.asm rename : media/libjpeg/simd/jfdctint-mmx.asm => media/libjpeg/simd/i386/jfdctint-mmx.asm rename : media/libjpeg/simd/jfdctint-sse2.asm => media/libjpeg/simd/i386/jfdctint-sse2.asm rename : media/libjpeg/simd/jidctflt-3dn.asm => media/libjpeg/simd/i386/jidctflt-3dn.asm rename : media/libjpeg/simd/jidctflt-sse.asm => media/libjpeg/simd/i386/jidctflt-sse.asm rename : media/libjpeg/simd/jidctflt-sse2.asm => media/libjpeg/simd/i386/jidctflt-sse2.asm rename : media/libjpeg/simd/jidctfst-mmx.asm => media/libjpeg/simd/i386/jidctfst-mmx.asm rename : media/libjpeg/simd/jidctfst-sse2.asm => media/libjpeg/simd/i386/jidctfst-sse2.asm rename : media/libjpeg/simd/jidctint-mmx.asm => media/libjpeg/simd/i386/jidctint-mmx.asm rename : media/libjpeg/simd/jidctint-sse2.asm => media/libjpeg/simd/i386/jidctint-sse2.asm rename : media/libjpeg/simd/jidctred-mmx.asm => media/libjpeg/simd/i386/jidctred-mmx.asm rename : media/libjpeg/simd/jidctred-sse2.asm => media/libjpeg/simd/i386/jidctred-sse2.asm rename : media/libjpeg/simd/jquant-3dn.asm => media/libjpeg/simd/i386/jquant-3dn.asm rename : media/libjpeg/simd/jquant-mmx.asm => media/libjpeg/simd/i386/jquant-mmx.asm rename : media/libjpeg/simd/jquant-sse.asm => media/libjpeg/simd/i386/jquant-sse.asm rename : media/libjpeg/simd/jquantf-sse2.asm => media/libjpeg/simd/i386/jquantf-sse2.asm rename : media/libjpeg/simd/jquanti-sse2.asm => media/libjpeg/simd/i386/jquanti-sse2.asm rename : media/libjpeg/simd/jsimd_i386.c => media/libjpeg/simd/i386/jsimd.c rename : media/libjpeg/simd/jsimdcpu.asm => media/libjpeg/simd/i386/jsimdcpu.asm rename : media/libjpeg/simd/jsimd_mips.c => media/libjpeg/simd/mips/jsimd.c rename : media/libjpeg/simd/jsimd_mips_dspr2.S => media/libjpeg/simd/mips/jsimd_dspr2.S rename : media/libjpeg/simd/jsimd_mips_dspr2_asm.h => media/libjpeg/simd/mips/jsimd_dspr2_asm.h rename : media/libjpeg/simd/jcolsamp.inc => media/libjpeg/simd/nasm/jcolsamp.inc rename : media/libjpeg/simd/jdct.inc => media/libjpeg/simd/nasm/jdct.inc rename : media/libjpeg/simd/jpeg_nbits_table.inc => media/libjpeg/simd/nasm/jpeg_nbits_table.inc rename : media/libjpeg/simd/jsimdcfg.inc => media/libjpeg/simd/nasm/jsimdcfg.inc rename : media/libjpeg/simd/jsimdext.inc => media/libjpeg/simd/nasm/jsimdext.inc rename : media/libjpeg/simd/jccolext-altivec.c => media/libjpeg/simd/powerpc/jccolext-altivec.c rename : media/libjpeg/simd/jccolor-altivec.c => media/libjpeg/simd/powerpc/jccolor-altivec.c rename : media/libjpeg/simd/jcgray-altivec.c => media/libjpeg/simd/powerpc/jcgray-altivec.c rename : media/libjpeg/simd/jcgryext-altivec.c => media/libjpeg/simd/powerpc/jcgryext-altivec.c rename : media/libjpeg/simd/jcsample-altivec.c => media/libjpeg/simd/powerpc/jcsample-altivec.c rename : media/libjpeg/simd/jcsample.h => media/libjpeg/simd/powerpc/jcsample.h rename : media/libjpeg/simd/jdcolext-altivec.c => media/libjpeg/simd/powerpc/jdcolext-altivec.c rename : media/libjpeg/simd/jdcolor-altivec.c => media/libjpeg/simd/powerpc/jdcolor-altivec.c rename : media/libjpeg/simd/jdmerge-altivec.c => media/libjpeg/simd/powerpc/jdmerge-altivec.c rename : media/libjpeg/simd/jdmrgext-altivec.c => media/libjpeg/simd/powerpc/jdmrgext-altivec.c rename : media/libjpeg/simd/jdsample-altivec.c => media/libjpeg/simd/powerpc/jdsample-altivec.c rename : media/libjpeg/simd/jfdctfst-altivec.c => media/libjpeg/simd/powerpc/jfdctfst-altivec.c rename : media/libjpeg/simd/jfdctint-altivec.c => media/libjpeg/simd/powerpc/jfdctint-altivec.c rename : media/libjpeg/simd/jidctfst-altivec.c => media/libjpeg/simd/powerpc/jidctfst-altivec.c rename : media/libjpeg/simd/jidctint-altivec.c => media/libjpeg/simd/powerpc/jidctint-altivec.c rename : media/libjpeg/simd/jquanti-altivec.c => media/libjpeg/simd/powerpc/jquanti-altivec.c rename : media/libjpeg/simd/jsimd_powerpc.c => media/libjpeg/simd/powerpc/jsimd.c rename : media/libjpeg/simd/jsimd_altivec.h => media/libjpeg/simd/powerpc/jsimd_altivec.h rename : media/libjpeg/simd/jccolext-sse2-64.asm => media/libjpeg/simd/x86_64/jccolext-sse2.asm rename : media/libjpeg/simd/jccolor-sse2-64.asm => media/libjpeg/simd/x86_64/jccolor-sse2.asm rename : media/libjpeg/simd/jcgray-sse2-64.asm => media/libjpeg/simd/x86_64/jcgray-sse2.asm rename : media/libjpeg/simd/jcgryext-sse2-64.asm => media/libjpeg/simd/x86_64/jcgryext-sse2.asm rename : media/libjpeg/simd/jchuff-sse2-64.asm => media/libjpeg/simd/x86_64/jchuff-sse2.asm rename : media/libjpeg/simd/jcsample-sse2-64.asm => media/libjpeg/simd/x86_64/jcsample-sse2.asm rename : media/libjpeg/simd/jdcolext-sse2-64.asm => media/libjpeg/simd/x86_64/jdcolext-sse2.asm rename : media/libjpeg/simd/jdcolor-sse2-64.asm => media/libjpeg/simd/x86_64/jdcolor-sse2.asm rename : media/libjpeg/simd/jdmerge-sse2-64.asm => media/libjpeg/simd/x86_64/jdmerge-sse2.asm rename : media/libjpeg/simd/jdmrgext-sse2-64.asm => media/libjpeg/simd/x86_64/jdmrgext-sse2.asm rename : media/libjpeg/simd/jdsample-sse2-64.asm => media/libjpeg/simd/x86_64/jdsample-sse2.asm rename : media/libjpeg/simd/jfdctflt-sse-64.asm => media/libjpeg/simd/x86_64/jfdctflt-sse.asm rename : media/libjpeg/simd/jfdctfst-sse2-64.asm => media/libjpeg/simd/x86_64/jfdctfst-sse2.asm rename : media/libjpeg/simd/jfdctint-sse2-64.asm => media/libjpeg/simd/x86_64/jfdctint-sse2.asm rename : media/libjpeg/simd/jidctflt-sse2-64.asm => media/libjpeg/simd/x86_64/jidctflt-sse2.asm rename : media/libjpeg/simd/jidctfst-sse2-64.asm => media/libjpeg/simd/x86_64/jidctfst-sse2.asm rename : media/libjpeg/simd/jidctint-sse2-64.asm => media/libjpeg/simd/x86_64/jidctint-sse2.asm rename : media/libjpeg/simd/jidctred-sse2-64.asm => media/libjpeg/simd/x86_64/jidctred-sse2.asm rename : media/libjpeg/simd/jquantf-sse2-64.asm => media/libjpeg/simd/x86_64/jquantf-sse2.asm rename : media/libjpeg/simd/jquanti-sse2-64.asm => media/libjpeg/simd/x86_64/jquanti-sse2.asm rename : media/libjpeg/simd/jsimd_x86_64.c => media/libjpeg/simd/x86_64/jsimd.c extra : moz-landing-system : lando
353 lines
11 KiB
C
353 lines
11 KiB
C
/*
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* jddctmgr.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* Modified 2002-2010 by Guido Vollbeding.
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* libjpeg-turbo Modifications:
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* Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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* Copyright (C) 2010, 2015, D. R. Commander.
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* Copyright (C) 2013, MIPS Technologies, Inc., California.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains the inverse-DCT management logic.
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* This code selects a particular IDCT implementation to be used,
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* and it performs related housekeeping chores. No code in this file
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* is executed per IDCT step, only during output pass setup.
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*
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* Note that the IDCT routines are responsible for performing coefficient
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* dequantization as well as the IDCT proper. This module sets up the
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* dequantization multiplier table needed by the IDCT routine.
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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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#include "jsimddct.h"
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#include "jpegcomp.h"
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/*
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* The decompressor input side (jdinput.c) saves away the appropriate
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* quantization table for each component at the start of the first scan
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* involving that component. (This is necessary in order to correctly
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* decode files that reuse Q-table slots.)
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* When we are ready to make an output pass, the saved Q-table is converted
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* to a multiplier table that will actually be used by the IDCT routine.
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* The multiplier table contents are IDCT-method-dependent. To support
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* application changes in IDCT method between scans, we can remake the
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* multiplier tables if necessary.
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* In buffered-image mode, the first output pass may occur before any data
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* has been seen for some components, and thus before their Q-tables have
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* been saved away. To handle this case, multiplier tables are preset
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* to zeroes; the result of the IDCT will be a neutral gray level.
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*/
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/* Private subobject for this module */
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typedef struct {
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struct jpeg_inverse_dct pub; /* public fields */
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/* This array contains the IDCT method code that each multiplier table
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* is currently set up for, or -1 if it's not yet set up.
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* The actual multiplier tables are pointed to by dct_table in the
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* per-component comp_info structures.
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*/
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int cur_method[MAX_COMPONENTS];
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} my_idct_controller;
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typedef my_idct_controller *my_idct_ptr;
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/* Allocated multiplier tables: big enough for any supported variant */
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typedef union {
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ISLOW_MULT_TYPE islow_array[DCTSIZE2];
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#ifdef DCT_IFAST_SUPPORTED
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IFAST_MULT_TYPE ifast_array[DCTSIZE2];
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#endif
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#ifdef DCT_FLOAT_SUPPORTED
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FLOAT_MULT_TYPE float_array[DCTSIZE2];
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#endif
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} multiplier_table;
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/* The current scaled-IDCT routines require ISLOW-style multiplier tables,
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* so be sure to compile that code if either ISLOW or SCALING is requested.
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*/
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#ifdef DCT_ISLOW_SUPPORTED
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#define PROVIDE_ISLOW_TABLES
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#else
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#ifdef IDCT_SCALING_SUPPORTED
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#define PROVIDE_ISLOW_TABLES
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#endif
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#endif
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/*
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* Prepare for an output pass.
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* Here we select the proper IDCT routine for each component and build
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* a matching multiplier table.
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*/
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METHODDEF(void)
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start_pass(j_decompress_ptr cinfo)
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{
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my_idct_ptr idct = (my_idct_ptr)cinfo->idct;
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int ci, i;
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jpeg_component_info *compptr;
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int method = 0;
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inverse_DCT_method_ptr method_ptr = NULL;
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JQUANT_TBL *qtbl;
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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/* Select the proper IDCT routine for this component's scaling */
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switch (compptr->_DCT_scaled_size) {
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#ifdef IDCT_SCALING_SUPPORTED
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case 1:
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method_ptr = jpeg_idct_1x1;
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method = JDCT_ISLOW; /* jidctred uses islow-style table */
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break;
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case 2:
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if (jsimd_can_idct_2x2())
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method_ptr = jsimd_idct_2x2;
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else
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method_ptr = jpeg_idct_2x2;
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method = JDCT_ISLOW; /* jidctred uses islow-style table */
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break;
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case 3:
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method_ptr = jpeg_idct_3x3;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 4:
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if (jsimd_can_idct_4x4())
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method_ptr = jsimd_idct_4x4;
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else
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method_ptr = jpeg_idct_4x4;
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method = JDCT_ISLOW; /* jidctred uses islow-style table */
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break;
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case 5:
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method_ptr = jpeg_idct_5x5;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 6:
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#if defined(__mips__)
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if (jsimd_can_idct_6x6())
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method_ptr = jsimd_idct_6x6;
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else
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#endif
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method_ptr = jpeg_idct_6x6;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 7:
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method_ptr = jpeg_idct_7x7;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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#endif
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case DCTSIZE:
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switch (cinfo->dct_method) {
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#ifdef DCT_ISLOW_SUPPORTED
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case JDCT_ISLOW:
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if (jsimd_can_idct_islow())
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method_ptr = jsimd_idct_islow;
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else
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method_ptr = jpeg_idct_islow;
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method = JDCT_ISLOW;
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break;
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#endif
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#ifdef DCT_IFAST_SUPPORTED
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case JDCT_IFAST:
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if (jsimd_can_idct_ifast())
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method_ptr = jsimd_idct_ifast;
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else
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method_ptr = jpeg_idct_ifast;
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method = JDCT_IFAST;
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break;
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#endif
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#ifdef DCT_FLOAT_SUPPORTED
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case JDCT_FLOAT:
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if (jsimd_can_idct_float())
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method_ptr = jsimd_idct_float;
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else
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method_ptr = jpeg_idct_float;
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method = JDCT_FLOAT;
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break;
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#endif
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default:
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ERREXIT(cinfo, JERR_NOT_COMPILED);
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break;
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}
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break;
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#ifdef IDCT_SCALING_SUPPORTED
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case 9:
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method_ptr = jpeg_idct_9x9;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 10:
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method_ptr = jpeg_idct_10x10;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 11:
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method_ptr = jpeg_idct_11x11;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 12:
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#if defined(__mips__)
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if (jsimd_can_idct_12x12())
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method_ptr = jsimd_idct_12x12;
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else
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#endif
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method_ptr = jpeg_idct_12x12;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 13:
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method_ptr = jpeg_idct_13x13;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 14:
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method_ptr = jpeg_idct_14x14;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 15:
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method_ptr = jpeg_idct_15x15;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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case 16:
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method_ptr = jpeg_idct_16x16;
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method = JDCT_ISLOW; /* jidctint uses islow-style table */
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break;
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#endif
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default:
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ERREXIT1(cinfo, JERR_BAD_DCTSIZE, compptr->_DCT_scaled_size);
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break;
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}
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idct->pub.inverse_DCT[ci] = method_ptr;
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/* Create multiplier table from quant table.
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* However, we can skip this if the component is uninteresting
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* or if we already built the table. Also, if no quant table
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* has yet been saved for the component, we leave the
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* multiplier table all-zero; we'll be reading zeroes from the
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* coefficient controller's buffer anyway.
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*/
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if (!compptr->component_needed || idct->cur_method[ci] == method)
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continue;
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qtbl = compptr->quant_table;
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if (qtbl == NULL) /* happens if no data yet for component */
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continue;
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idct->cur_method[ci] = method;
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switch (method) {
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#ifdef PROVIDE_ISLOW_TABLES
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case JDCT_ISLOW:
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{
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/* For LL&M IDCT method, multipliers are equal to raw quantization
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* coefficients, but are stored as ints to ensure access efficiency.
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*/
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ISLOW_MULT_TYPE *ismtbl = (ISLOW_MULT_TYPE *)compptr->dct_table;
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for (i = 0; i < DCTSIZE2; i++) {
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ismtbl[i] = (ISLOW_MULT_TYPE)qtbl->quantval[i];
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|
}
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef DCT_IFAST_SUPPORTED
|
|
case JDCT_IFAST:
|
|
{
|
|
/* For AA&N IDCT method, multipliers are equal to quantization
|
|
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
|
* scalefactor[0] = 1
|
|
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
|
* For integer operation, the multiplier table is to be scaled by
|
|
* IFAST_SCALE_BITS.
|
|
*/
|
|
IFAST_MULT_TYPE *ifmtbl = (IFAST_MULT_TYPE *)compptr->dct_table;
|
|
#define CONST_BITS 14
|
|
static const INT16 aanscales[DCTSIZE2] = {
|
|
/* precomputed values scaled up by 14 bits */
|
|
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
|
|
22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
|
|
21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
|
|
19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
|
|
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
|
|
12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
|
|
8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
|
|
4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247
|
|
};
|
|
SHIFT_TEMPS
|
|
|
|
for (i = 0; i < DCTSIZE2; i++) {
|
|
ifmtbl[i] = (IFAST_MULT_TYPE)
|
|
DESCALE(MULTIPLY16V16((JLONG)qtbl->quantval[i],
|
|
(JLONG)aanscales[i]),
|
|
CONST_BITS - IFAST_SCALE_BITS);
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef DCT_FLOAT_SUPPORTED
|
|
case JDCT_FLOAT:
|
|
{
|
|
/* For float AA&N IDCT method, multipliers are equal to quantization
|
|
* coefficients scaled by scalefactor[row]*scalefactor[col], where
|
|
* scalefactor[0] = 1
|
|
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
|
|
*/
|
|
FLOAT_MULT_TYPE *fmtbl = (FLOAT_MULT_TYPE *)compptr->dct_table;
|
|
int row, col;
|
|
static const double aanscalefactor[DCTSIZE] = {
|
|
1.0, 1.387039845, 1.306562965, 1.175875602,
|
|
1.0, 0.785694958, 0.541196100, 0.275899379
|
|
};
|
|
|
|
i = 0;
|
|
for (row = 0; row < DCTSIZE; row++) {
|
|
for (col = 0; col < DCTSIZE; col++) {
|
|
fmtbl[i] = (FLOAT_MULT_TYPE)
|
|
((double)qtbl->quantval[i] *
|
|
aanscalefactor[row] * aanscalefactor[col]);
|
|
i++;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialize IDCT manager.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jinit_inverse_dct(j_decompress_ptr cinfo)
|
|
{
|
|
my_idct_ptr idct;
|
|
int ci;
|
|
jpeg_component_info *compptr;
|
|
|
|
idct = (my_idct_ptr)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
|
|
sizeof(my_idct_controller));
|
|
cinfo->idct = (struct jpeg_inverse_dct *)idct;
|
|
idct->pub.start_pass = start_pass;
|
|
|
|
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
|
ci++, compptr++) {
|
|
/* Allocate and pre-zero a multiplier table for each component */
|
|
compptr->dct_table =
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
|
|
sizeof(multiplier_table));
|
|
MEMZERO(compptr->dct_table, sizeof(multiplier_table));
|
|
/* Mark multiplier table not yet set up for any method */
|
|
idct->cur_method[ci] = -1;
|
|
}
|
|
}
|