1a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Copyright 2012 Google Inc. All Rights Reserved. 2a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// 30406ce1417f76f2034833414dcecc9f56253640cVikas Arora// Use of this source code is governed by a BSD-style license 40406ce1417f76f2034833414dcecc9f56253640cVikas Arora// that can be found in the COPYING file in the root of the source 50406ce1417f76f2034833414dcecc9f56253640cVikas Arora// tree. An additional intellectual property rights grant can be found 60406ce1417f76f2034833414dcecc9f56253640cVikas Arora// in the file PATENTS. All contributing project authors may 70406ce1417f76f2034833414dcecc9f56253640cVikas Arora// be found in the AUTHORS file in the root of the source tree. 8a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// ----------------------------------------------------------------------------- 9a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// 10a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Image transforms and color space conversion methods for lossless decoder. 11a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// 12a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Authors: Vikas Arora (vikaas.arora@gmail.com) 13a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Jyrki Alakuijala (jyrki@google.com) 14a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 15a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#ifndef WEBP_DSP_LOSSLESS_H_ 16a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define WEBP_DSP_LOSSLESS_H_ 17a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 189e80ee991168a0a6c2a906dd2c17c5e17df4566eJames Zern#include "../webp/types.h" 199e80ee991168a0a6c2a906dd2c17c5e17df4566eJames Zern#include "../webp/decode.h" 20a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 2133f74dabbc7920a65ed435d7417987589febdc16Vikas Arora#include "../enc/histogram.h" 2233f74dabbc7920a65ed435d7417987589febdc16Vikas Arora#include "../utils/utils.h" 2333f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 248b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#ifdef __cplusplus 25a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroraextern "C" { 26a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#endif 27a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 28a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora//------------------------------------------------------------------------------ 2933f74dabbc7920a65ed435d7417987589febdc16Vikas Arora// Signatures and generic function-pointers 3033f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 3133f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef uint32_t (*VP8LPredictorFunc)(uint32_t left, const uint32_t* const top); 3233f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LPredictorFunc VP8LPredictors[16]; 3333f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 3433f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef void (*VP8LProcessBlueAndRedFunc)(uint32_t* argb_data, int num_pixels); 3533f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LProcessBlueAndRedFunc VP8LSubtractGreenFromBlueAndRed; 3633f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LProcessBlueAndRedFunc VP8LAddGreenToBlueAndRed; 3733f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 3833f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef struct { 3933f74dabbc7920a65ed435d7417987589febdc16Vikas Arora // Note: the members are uint8_t, so that any negative values are 4033f74dabbc7920a65ed435d7417987589febdc16Vikas Arora // automatically converted to "mod 256" values. 4133f74dabbc7920a65ed435d7417987589febdc16Vikas Arora uint8_t green_to_red_; 4233f74dabbc7920a65ed435d7417987589febdc16Vikas Arora uint8_t green_to_blue_; 4333f74dabbc7920a65ed435d7417987589febdc16Vikas Arora uint8_t red_to_blue_; 4433f74dabbc7920a65ed435d7417987589febdc16Vikas Arora} VP8LMultipliers; 4533f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef void (*VP8LTransformColorFunc)(const VP8LMultipliers* const m, 4633f74dabbc7920a65ed435d7417987589febdc16Vikas Arora uint32_t* argb_data, int num_pixels); 4733f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LTransformColorFunc VP8LTransformColor; 4833f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LTransformColorFunc VP8LTransformColorInverse; 4933f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 5033f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef void (*VP8LConvertFunc)(const uint32_t* src, int num_pixels, 5133f74dabbc7920a65ed435d7417987589febdc16Vikas Arora uint8_t* dst); 5233f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LConvertFunc VP8LConvertBGRAToRGB; 5333f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LConvertFunc VP8LConvertBGRAToRGBA; 5433f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LConvertFunc VP8LConvertBGRAToRGBA4444; 5533f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LConvertFunc VP8LConvertBGRAToRGB565; 5633f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LConvertFunc VP8LConvertBGRAToBGR; 5733f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 5833f74dabbc7920a65ed435d7417987589febdc16Vikas Arora// Expose some C-only fallback functions 598c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LTransformColor_C(const VP8LMultipliers* const m, 608c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Arora uint32_t* data, int num_pixels); 618c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LTransformColorInverse_C(const VP8LMultipliers* const m, 6233f74dabbc7920a65ed435d7417987589febdc16Vikas Arora uint32_t* data, int num_pixels); 6333f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 648c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LConvertBGRAToRGB_C(const uint32_t* src, int num_pixels, uint8_t* dst); 658c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LConvertBGRAToRGBA_C(const uint32_t* src, int num_pixels, uint8_t* dst); 668c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LConvertBGRAToRGBA4444_C(const uint32_t* src, 678c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Arora int num_pixels, uint8_t* dst); 688c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LConvertBGRAToRGB565_C(const uint32_t* src, 698c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Arora int num_pixels, uint8_t* dst); 708c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LConvertBGRAToBGR_C(const uint32_t* src, int num_pixels, uint8_t* dst); 718c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LSubtractGreenFromBlueAndRed_C(uint32_t* argb_data, int num_pixels); 728c098653157979e397d3954fc2ea0ee43bae6ab2Vikas Aroravoid VP8LAddGreenToBlueAndRed_C(uint32_t* data, int num_pixels); 738b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 748b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Must be called before calling any of the above methods. 758b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroravoid VP8LDspInit(void); 768b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 778b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora//------------------------------------------------------------------------------ 78a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Image transforms. 79a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 80a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastruct VP8LTransform; // Defined in dec/vp8li.h. 81a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 82a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Performs inverse transform of data given transform information, start and end 83a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// rows. Transform will be applied to rows [row_start, row_end[. 84a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// The *in and *out pointers refer to source and destination data respectively 85a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// corresponding to the intermediate row (row_start). 86a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroravoid VP8LInverseTransform(const struct VP8LTransform* const transform, 87a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora int row_start, int row_end, 88a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint32_t* const in, uint32_t* const out); 89a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 900406ce1417f76f2034833414dcecc9f56253640cVikas Arora// Similar to the static method ColorIndexInverseTransform() that is part of 910406ce1417f76f2034833414dcecc9f56253640cVikas Arora// lossless.c, but used only for alpha decoding. It takes uint8_t (rather than 920406ce1417f76f2034833414dcecc9f56253640cVikas Arora// uint32_t) arguments for 'src' and 'dst'. 930406ce1417f76f2034833414dcecc9f56253640cVikas Aroravoid VP8LColorIndexInverseTransformAlpha( 940406ce1417f76f2034833414dcecc9f56253640cVikas Arora const struct VP8LTransform* const transform, int y_start, int y_end, 950406ce1417f76f2034833414dcecc9f56253640cVikas Arora const uint8_t* src, uint8_t* dst); 960406ce1417f76f2034833414dcecc9f56253640cVikas Arora 97a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroravoid VP8LResidualImage(int width, int height, int bits, 98a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint32_t* const argb, uint32_t* const argb_scratch, 99a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint32_t* const image); 100a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 10133f74dabbc7920a65ed435d7417987589febdc16Vikas Aroravoid VP8LColorSpaceTransform(int width, int height, int bits, int quality, 102a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint32_t* const argb, uint32_t* image); 103a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 104a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora//------------------------------------------------------------------------------ 105a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Color space conversion. 106a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 107a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Converts from BGRA to other color spaces. 108a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroravoid VP8LConvertFromBGRA(const uint32_t* const in_data, int num_pixels, 109a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora WEBP_CSP_MODE out_colorspace, uint8_t* const rgba); 110a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 111a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora//------------------------------------------------------------------------------ 112a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Misc methods. 113a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 114a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Computes sampled size of 'size' when sampling using 'sampling bits'. 115a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic WEBP_INLINE uint32_t VP8LSubSampleSize(uint32_t size, 116a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint32_t sampling_bits) { 117a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return (size + (1 << sampling_bits) - 1) >> sampling_bits; 118a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 119a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 12033f74dabbc7920a65ed435d7417987589febdc16Vikas Arora// ----------------------------------------------------------------------------- 1211e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// Faster logarithm for integers. Small values use a look-up table. 1221e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#define LOG_LOOKUP_IDX_MAX 256 1231e7bf8805bd030c19924a5306837ecd72c295751Vikas Aroraextern const float kLog2Table[LOG_LOOKUP_IDX_MAX]; 1241e7bf8805bd030c19924a5306837ecd72c295751Vikas Aroraextern const float kSLog2Table[LOG_LOOKUP_IDX_MAX]; 12533f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef float (*VP8LFastLog2SlowFunc)(uint32_t v); 12633f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 12733f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LFastLog2SlowFunc VP8LFastLog2Slow; 12833f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LFastLog2SlowFunc VP8LFastSLog2Slow; 12933f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 13033f74dabbc7920a65ed435d7417987589febdc16Vikas Arorastatic WEBP_INLINE float VP8LFastLog2(uint32_t v) { 1311e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora return (v < LOG_LOOKUP_IDX_MAX) ? kLog2Table[v] : VP8LFastLog2Slow(v); 1321e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora} 133a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Fast calculation of v * log2(v) for integer input. 13433f74dabbc7920a65ed435d7417987589febdc16Vikas Arorastatic WEBP_INLINE float VP8LFastSLog2(uint32_t v) { 1351e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora return (v < LOG_LOOKUP_IDX_MAX) ? kSLog2Table[v] : VP8LFastSLog2Slow(v); 1361e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora} 1371e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 1388b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// ----------------------------------------------------------------------------- 13933f74dabbc7920a65ed435d7417987589febdc16Vikas Arora// Huffman-cost related functions. 1408b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 14133f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef double (*VP8LCostFunc)(const uint32_t* population, int length); 14233f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef double (*VP8LCostCombinedFunc)(const uint32_t* X, const uint32_t* Y, 14333f74dabbc7920a65ed435d7417987589febdc16Vikas Arora int length); 14433f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 14533f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LCostFunc VP8LExtraCost; 14633f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LCostCombinedFunc VP8LExtraCostCombined; 14733f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 14833f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef struct { // small struct to hold counters 14933f74dabbc7920a65ed435d7417987589febdc16Vikas Arora int counts[2]; // index: 0=zero steak, 1=non-zero streak 15033f74dabbc7920a65ed435d7417987589febdc16Vikas Arora int streaks[2][2]; // [zero/non-zero][streak<3 / streak>=3] 15133f74dabbc7920a65ed435d7417987589febdc16Vikas Arora} VP8LStreaks; 15233f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 15333f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef VP8LStreaks (*VP8LCostCountFunc)(const uint32_t* population, 15433f74dabbc7920a65ed435d7417987589febdc16Vikas Arora int length); 15533f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef VP8LStreaks (*VP8LCostCombinedCountFunc)(const uint32_t* X, 15633f74dabbc7920a65ed435d7417987589febdc16Vikas Arora const uint32_t* Y, int length); 15733f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 15833f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LCostCountFunc VP8LHuffmanCostCount; 15933f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LCostCombinedCountFunc VP8LHuffmanCostCombinedCount; 16033f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 16133f74dabbc7920a65ed435d7417987589febdc16Vikas Aroratypedef void (*VP8LHistogramAddFunc)(const VP8LHistogram* const a, 16233f74dabbc7920a65ed435d7417987589febdc16Vikas Arora const VP8LHistogram* const b, 16333f74dabbc7920a65ed435d7417987589febdc16Vikas Arora VP8LHistogram* const out); 16433f74dabbc7920a65ed435d7417987589febdc16Vikas Aroraextern VP8LHistogramAddFunc VP8LHistogramAdd; 16533f74dabbc7920a65ed435d7417987589febdc16Vikas Arora 16633f74dabbc7920a65ed435d7417987589febdc16Vikas Arora// ----------------------------------------------------------------------------- 16733f74dabbc7920a65ed435d7417987589febdc16Vikas Arora// PrefixEncode() 1688b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 1698b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8LBitsLog2Ceiling(uint32_t n) { 1708b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int log_floor = BitsLog2Floor(n); 1718b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (n == (n & ~(n - 1))) // zero or a power of two. 1728b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return log_floor; 1738b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora else 1748b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return log_floor + 1; 1758b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 1768b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 1778b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Splitting of distance and length codes into prefixes and 1788b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// extra bits. The prefixes are encoded with an entropy code 1798b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// while the extra bits are stored just as normal bits. 1808b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8LPrefixEncodeBitsNoLUT(int distance, int* const code, 1818b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int* const extra_bits) { 1828b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int highest_bit = BitsLog2Floor(--distance); 1838b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int second_highest_bit = (distance >> (highest_bit - 1)) & 1; 1848b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *extra_bits = highest_bit - 1; 1858b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *code = 2 * highest_bit + second_highest_bit; 1868b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 1878b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 1888b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8LPrefixEncodeNoLUT(int distance, int* const code, 1898b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int* const extra_bits, 1908b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int* const extra_bits_value) { 1918b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int highest_bit = BitsLog2Floor(--distance); 1928b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int second_highest_bit = (distance >> (highest_bit - 1)) & 1; 1938b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *extra_bits = highest_bit - 1; 1948b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *extra_bits_value = distance & ((1 << *extra_bits) - 1); 1958b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *code = 2 * highest_bit + second_highest_bit; 1968b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 1978b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 1988b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define PREFIX_LOOKUP_IDX_MAX 512 1998b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroratypedef struct { 2008b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int8_t code_; 2018b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int8_t extra_bits_; 2028b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} VP8LPrefixCode; 2038b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 2048b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// These tables are derived using VP8LPrefixEncodeNoLUT. 2058b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroraextern const VP8LPrefixCode kPrefixEncodeCode[PREFIX_LOOKUP_IDX_MAX]; 2068b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroraextern const uint8_t kPrefixEncodeExtraBitsValue[PREFIX_LOOKUP_IDX_MAX]; 2078b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8LPrefixEncodeBits(int distance, int* const code, 2088b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int* const extra_bits) { 2098b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (distance < PREFIX_LOOKUP_IDX_MAX) { 2108b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const VP8LPrefixCode prefix_code = kPrefixEncodeCode[distance]; 2118b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *code = prefix_code.code_; 2128b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *extra_bits = prefix_code.extra_bits_; 2138b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } else { 2148b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8LPrefixEncodeBitsNoLUT(distance, code, extra_bits); 2158b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } 2168b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 2178b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 2188b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8LPrefixEncode(int distance, int* const code, 2198b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int* const extra_bits, 2208b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int* const extra_bits_value) { 2218b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (distance < PREFIX_LOOKUP_IDX_MAX) { 2228b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const VP8LPrefixCode prefix_code = kPrefixEncodeCode[distance]; 2238b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *code = prefix_code.code_; 2248b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *extra_bits = prefix_code.extra_bits_; 2258b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora *extra_bits_value = kPrefixEncodeExtraBitsValue[distance]; 2268b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } else { 2278b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8LPrefixEncodeNoLUT(distance, code, extra_bits, extra_bits_value); 2288b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } 2298b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 230a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 231a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// In-place difference of each component with mod 256. 232a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic WEBP_INLINE uint32_t VP8LSubPixels(uint32_t a, uint32_t b) { 233a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint32_t alpha_and_green = 234a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 0x00ff00ffu + (a & 0xff00ff00u) - (b & 0xff00ff00u); 235a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint32_t red_and_blue = 236a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 0xff00ff00u + (a & 0x00ff00ffu) - (b & 0x00ff00ffu); 237a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return (alpha_and_green & 0xff00ff00u) | (red_and_blue & 0x00ff00ffu); 238a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 239a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 2400406ce1417f76f2034833414dcecc9f56253640cVikas Aroravoid VP8LBundleColorMap(const uint8_t* const row, int width, 2410406ce1417f76f2034833414dcecc9f56253640cVikas Arora int xbits, uint32_t* const dst); 2420406ce1417f76f2034833414dcecc9f56253640cVikas Arora 243a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora//------------------------------------------------------------------------------ 244a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 2458b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#ifdef __cplusplus 246a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} // extern "C" 247a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#endif 248a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 249a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#endif // WEBP_DSP_LOSSLESS_H_ 250