yuv.h revision af51b94a435132e9014c324e25fb686b3d07a8c8
1a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Copyright 2010 Google Inc. All Rights Reserved. 29aea642eefa7a641ab8b89d953251939221d2719Eric Hassold// 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. 89aea642eefa7a641ab8b89d953251939221d2719Eric Hassold// ----------------------------------------------------------------------------- 99aea642eefa7a641ab8b89d953251939221d2719Eric Hassold// 10a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// inline YUV<->RGB conversion function 119aea642eefa7a641ab8b89d953251939221d2719Eric Hassold// 121e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// The exact naming is Y'CbCr, following the ITU-R BT.601 standard. 131e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// More information at: http://en.wikipedia.org/wiki/YCbCr 141e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// Y = 0.2569 * R + 0.5044 * G + 0.0979 * B + 16 151e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// U = -0.1483 * R - 0.2911 * G + 0.4394 * B + 128 161e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// V = 0.4394 * R - 0.3679 * G - 0.0715 * B + 128 178b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// We use 16bit fixed point operations for RGB->YUV conversion (YUV_FIX). 181e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// 191e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// For the Y'CbCr to RGB conversion, the BT.601 specification reads: 201e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// R = 1.164 * (Y-16) + 1.596 * (V-128) 211e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// G = 1.164 * (Y-16) - 0.813 * (V-128) - 0.391 * (U-128) 221e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// B = 1.164 * (Y-16) + 2.018 * (U-128) 231e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// where Y is in the [16,235] range, and U/V in the [16,240] range. 240406ce1417f76f2034833414dcecc9f56253640cVikas Arora// In the table-lookup version (WEBP_YUV_USE_TABLE), the common factor 250406ce1417f76f2034833414dcecc9f56253640cVikas Arora// "1.164 * (Y-16)" can be handled as an offset in the VP8kClip[] table. 268b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// So in this case the formulae should read: 271e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// R = 1.164 * [Y + 1.371 * (V-128) ] - 18.624 281e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// G = 1.164 * [Y - 0.698 * (V-128) - 0.336 * (U-128)] - 18.624 291e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// B = 1.164 * [Y + 1.733 * (U-128)] - 18.624 308b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// once factorized. 318b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// For YUV->RGB conversion, only 14bit fixed precision is used (YUV_FIX2). 328b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// That's the maximum possible for a convenient ARM implementation. 331e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// 349aea642eefa7a641ab8b89d953251939221d2719Eric Hassold// Author: Skal (pascal.massimino@gmail.com) 359aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 36a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#ifndef WEBP_DSP_YUV_H_ 37a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#define WEBP_DSP_YUV_H_ 389aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 398b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#include "./dsp.h" 40a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#include "../dec/decode_vp8.h" 419aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 420406ce1417f76f2034833414dcecc9f56253640cVikas Arora// Define the following to use the LUT-based code: 438b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// #define WEBP_YUV_USE_TABLE 440406ce1417f76f2034833414dcecc9f56253640cVikas Arora 451e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#if defined(WEBP_EXPERIMENTAL_FEATURES) 461e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// Do NOT activate this feature for real compression. This is only experimental! 471e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// This flag is for comparison purpose against JPEG's "YUVj" natural colorspace. 481e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// This colorspace is close to Rec.601's Y'CbCr model with the notable 491e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// difference of allowing larger range for luma/chroma. 501e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// See http://en.wikipedia.org/wiki/YCbCr#JPEG_conversion paragraph, and its 511e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// difference with http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion 521e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// #define USE_YUVj 531e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#endif 5488fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora 55a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora//------------------------------------------------------------------------------ 56a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// YUV -> RGB conversion 57a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 588b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#ifdef __cplusplus 599aea642eefa7a641ab8b89d953251939221d2719Eric Hassoldextern "C" { 609aea642eefa7a641ab8b89d953251939221d2719Eric Hassold#endif 619aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 628b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroraenum { 638b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_FIX = 16, // fixed-point precision for RGB->YUV 648b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_HALF = 1 << (YUV_FIX - 1), 658b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_MASK = (256 << YUV_FIX) - 1, 668b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_RANGE_MIN = -227, // min value of r/g/b output 678b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_RANGE_MAX = 256 + 226, // max value of r/g/b output 688b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 698b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_FIX2 = 14, // fixed-point precision for YUV->RGB 708b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_HALF2 = 1 << (YUV_FIX2 - 1), 718b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora YUV_MASK2 = (256 << YUV_FIX2) - 1 729aea642eefa7a641ab8b89d953251939221d2719Eric Hassold}; 730406ce1417f76f2034833414dcecc9f56253640cVikas Arora 748b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// These constants are 14b fixed-point version of ITU-R BT.601 constants. 758b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kYScale 19077 // 1.164 = 255 / 219 768b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kVToR 26149 // 1.596 = 255 / 112 * 0.701 778b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kUToG 6419 // 0.391 = 255 / 112 * 0.886 * 0.114 / 0.587 788b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kVToG 13320 // 0.813 = 255 / 112 * 0.701 * 0.299 / 0.587 798b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kUToB 33050 // 2.018 = 255 / 112 * 0.886 808b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kRCst (-kYScale * 16 - kVToR * 128 + YUV_HALF2) 818b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kGCst (-kYScale * 16 + kUToG * 128 + kVToG * 128 + YUV_HALF2) 828b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#define kBCst (-kYScale * 16 - kUToB * 128 + YUV_HALF2) 830406ce1417f76f2034833414dcecc9f56253640cVikas Arora 848b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora//------------------------------------------------------------------------------ 858b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 868b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#if !defined(WEBP_YUV_USE_TABLE) 878b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 888b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// slower on x86 by ~7-8%, but bit-exact with the SSE2 version 898b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 908b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8Clip8(int v) { 918b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return ((v & ~YUV_MASK2) == 0) ? (v >> YUV_FIX2) : (v < 0) ? 0 : 255; 928b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 938b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 948b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8YUVToR(int y, int v) { 958b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return VP8Clip8(kYScale * y + kVToR * v + kRCst); 968b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 978b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 988b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8YUVToG(int y, int u, int v) { 998b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return VP8Clip8(kYScale * y - kUToG * u - kVToG * v + kGCst); 1008b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 1018b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 1028b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8YUVToB(int y, int u) { 1038b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return VP8Clip8(kYScale * y + kUToB * u + kBCst); 1048b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora} 1059aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 1068b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToRgb(int y, int u, int v, 107a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* const rgb) { 1088b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora rgb[0] = VP8YUVToR(y, v); 1098b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora rgb[1] = VP8YUVToG(y, u, v); 1108b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora rgb[2] = VP8YUVToB(y, u); 1119aea642eefa7a641ab8b89d953251939221d2719Eric Hassold} 1129aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 1138b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToBgr(int y, int u, int v, 1140406ce1417f76f2034833414dcecc9f56253640cVikas Arora uint8_t* const bgr) { 1158b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora bgr[0] = VP8YUVToB(y, u); 1168b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora bgr[1] = VP8YUVToG(y, u, v); 1178b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora bgr[2] = VP8YUVToR(y, v); 1180406ce1417f76f2034833414dcecc9f56253640cVikas Arora} 1190406ce1417f76f2034833414dcecc9f56253640cVikas Arora 1208b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToRgb565(int y, int u, int v, 121a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* const rgb) { 1228b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int r = VP8YUVToR(y, v); // 5 usable bits 1238b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int g = VP8YUVToG(y, u, v); // 6 usable bits 1248b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int b = VP8YUVToB(y, u); // 5 usable bits 1258b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int rg = (r & 0xf8) | (g >> 5); 1268b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int gb = ((g << 3) & 0xe0) | (b >> 3); 1271e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#ifdef WEBP_SWAP_16BIT_CSP 1281e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora rgb[0] = gb; 1291e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora rgb[1] = rg; 13088fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora#else 1311e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora rgb[0] = rg; 1321e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora rgb[1] = gb; 13388fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora#endif 134466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora} 135466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 1368b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToRgba4444(int y, int u, int v, 137466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora uint8_t* const argb) { 1388b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int r = VP8YUVToR(y, v); // 4 usable bits 1398b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int g = VP8YUVToG(y, u, v); // 4 usable bits 1408b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int b = VP8YUVToB(y, u); // 4 usable bits 1418b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int rg = (r & 0xf0) | (g >> 4); 1428b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int ba = (b & 0xf0) | 0x0f; // overwrite the lower 4 bits 1431e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#ifdef WEBP_SWAP_16BIT_CSP 1441e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora argb[0] = ba; 1451e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora argb[1] = rg; 14688fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora#else 1471e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora argb[0] = rg; 1481e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora argb[1] = ba; 14988fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora#endif 1509aea642eefa7a641ab8b89d953251939221d2719Eric Hassold} 1519aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 1528b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#else 1530406ce1417f76f2034833414dcecc9f56253640cVikas Arora 1548b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Table-based version, not totally equivalent to the SSE2 version. 1558b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Rounding diff is only +/-1 though. 1560406ce1417f76f2034833414dcecc9f56253640cVikas Arora 1578b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroraextern int16_t VP8kVToR[256], VP8kUToB[256]; 1588b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroraextern int32_t VP8kVToG[256], VP8kUToG[256]; 1598b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroraextern uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN]; 1608b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroraextern uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN]; 1610406ce1417f76f2034833414dcecc9f56253640cVikas Arora 1628b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToRgb(int y, int u, int v, 1630406ce1417f76f2034833414dcecc9f56253640cVikas Arora uint8_t* const rgb) { 1648b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int r_off = VP8kVToR[v]; 1658b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 1668b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int b_off = VP8kUToB[u]; 1678b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora rgb[0] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 1688b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora rgb[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 1698b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora rgb[2] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 1700406ce1417f76f2034833414dcecc9f56253640cVikas Arora} 1710406ce1417f76f2034833414dcecc9f56253640cVikas Arora 1728b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToBgr(int y, int u, int v, 173a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* const bgr) { 1748b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int r_off = VP8kVToR[v]; 1758b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 1768b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int b_off = VP8kUToB[u]; 1778b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora bgr[0] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 1788b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora bgr[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 1798b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora bgr[2] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 1800406ce1417f76f2034833414dcecc9f56253640cVikas Arora} 1810406ce1417f76f2034833414dcecc9f56253640cVikas Arora 1828b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToRgb565(int y, int u, int v, 1830406ce1417f76f2034833414dcecc9f56253640cVikas Arora uint8_t* const rgb) { 1848b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int r_off = VP8kVToR[v]; 1858b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 1868b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int b_off = VP8kUToB[u]; 1878b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int rg = ((VP8kClip[y + r_off - YUV_RANGE_MIN] & 0xf8) | 1888b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora (VP8kClip[y + g_off - YUV_RANGE_MIN] >> 5)); 1898b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int gb = (((VP8kClip[y + g_off - YUV_RANGE_MIN] << 3) & 0xe0) | 1908b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora (VP8kClip[y + b_off - YUV_RANGE_MIN] >> 3)); 1910406ce1417f76f2034833414dcecc9f56253640cVikas Arora#ifdef WEBP_SWAP_16BIT_CSP 1920406ce1417f76f2034833414dcecc9f56253640cVikas Arora rgb[0] = gb; 1930406ce1417f76f2034833414dcecc9f56253640cVikas Arora rgb[1] = rg; 1940406ce1417f76f2034833414dcecc9f56253640cVikas Arora#else 1950406ce1417f76f2034833414dcecc9f56253640cVikas Arora rgb[0] = rg; 1960406ce1417f76f2034833414dcecc9f56253640cVikas Arora rgb[1] = gb; 1970406ce1417f76f2034833414dcecc9f56253640cVikas Arora#endif 1980406ce1417f76f2034833414dcecc9f56253640cVikas Arora} 1990406ce1417f76f2034833414dcecc9f56253640cVikas Arora 2008b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE void VP8YuvToRgba4444(int y, int u, int v, 2010406ce1417f76f2034833414dcecc9f56253640cVikas Arora uint8_t* const argb) { 2028b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int r_off = VP8kVToR[v]; 2038b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 2048b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int b_off = VP8kUToB[u]; 2058b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int rg = ((VP8kClip4Bits[y + r_off - YUV_RANGE_MIN] << 4) | 2068b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8kClip4Bits[y + g_off - YUV_RANGE_MIN]); 2078b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora const int ba = (VP8kClip4Bits[y + b_off - YUV_RANGE_MIN] << 4) | 0x0f; 2080406ce1417f76f2034833414dcecc9f56253640cVikas Arora#ifdef WEBP_SWAP_16BIT_CSP 2090406ce1417f76f2034833414dcecc9f56253640cVikas Arora argb[0] = ba; 2100406ce1417f76f2034833414dcecc9f56253640cVikas Arora argb[1] = rg; 2110406ce1417f76f2034833414dcecc9f56253640cVikas Arora#else 2120406ce1417f76f2034833414dcecc9f56253640cVikas Arora argb[0] = rg; 2130406ce1417f76f2034833414dcecc9f56253640cVikas Arora argb[1] = ba; 2140406ce1417f76f2034833414dcecc9f56253640cVikas Arora#endif 2150406ce1417f76f2034833414dcecc9f56253640cVikas Arora} 2160406ce1417f76f2034833414dcecc9f56253640cVikas Arora 2170406ce1417f76f2034833414dcecc9f56253640cVikas Arora#endif // WEBP_YUV_USE_TABLE 2180406ce1417f76f2034833414dcecc9f56253640cVikas Arora 2198b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora//----------------------------------------------------------------------------- 2208b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Alpha handling variants 2218b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 2220406ce1417f76f2034833414dcecc9f56253640cVikas Arorastatic WEBP_INLINE void VP8YuvToArgb(uint8_t y, uint8_t u, uint8_t v, 2230406ce1417f76f2034833414dcecc9f56253640cVikas Arora uint8_t* const argb) { 2240406ce1417f76f2034833414dcecc9f56253640cVikas Arora argb[0] = 0xff; 2250406ce1417f76f2034833414dcecc9f56253640cVikas Arora VP8YuvToRgb(y, u, v, argb + 1); 2269aea642eefa7a641ab8b89d953251939221d2719Eric Hassold} 2279aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 228a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic WEBP_INLINE void VP8YuvToBgra(uint8_t y, uint8_t u, uint8_t v, 229a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* const bgra) { 2309aea642eefa7a641ab8b89d953251939221d2719Eric Hassold VP8YuvToBgr(y, u, v, bgra); 2319aea642eefa7a641ab8b89d953251939221d2719Eric Hassold bgra[3] = 0xff; 2329aea642eefa7a641ab8b89d953251939221d2719Eric Hassold} 2339aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 234a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic WEBP_INLINE void VP8YuvToRgba(uint8_t y, uint8_t u, uint8_t v, 235a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* const rgba) { 236466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora VP8YuvToRgb(y, u, v, rgba); 237466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora rgba[3] = 0xff; 238466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora} 239466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 2409aea642eefa7a641ab8b89d953251939221d2719Eric Hassold// Must be called before everything, to initialize the tables. 24103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Aroravoid VP8YUVInit(void); 2429aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 2438b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora//----------------------------------------------------------------------------- 2448b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// SSE2 extra functions (mostly for upsampling_sse2.c) 2458b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 2468b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#if defined(WEBP_USE_SSE2) 2478b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 248af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// When the following is defined, tables are initialized statically, adding ~12k 249af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// to the binary size. Otherwise, they are initialized at run-time (small cost). 250af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define WEBP_YUV_USE_SSE2_TABLES 251af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 2528b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#if defined(FANCY_UPSAMPLING) 2538b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Process 32 pixels and store the result (24b or 32b per pixel) in *dst. 2548b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroravoid VP8YuvToRgba32(const uint8_t* y, const uint8_t* u, const uint8_t* v, 2558b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora uint8_t* dst); 2568b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroravoid VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v, 2578b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora uint8_t* dst); 2588b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroravoid VP8YuvToBgra32(const uint8_t* y, const uint8_t* u, const uint8_t* v, 2598b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora uint8_t* dst); 2608b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroravoid VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v, 2618b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora uint8_t* dst); 2628b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#endif // FANCY_UPSAMPLING 2638b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 2648b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Must be called to initialize tables before using the functions. 2658b720228d581a84fd173b6dcb2fa295b59db489aVikas Aroravoid VP8YUVInitSSE2(void); 2668b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 2678b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#endif // WEBP_USE_SSE2 2688b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 269a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora//------------------------------------------------------------------------------ 270a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// RGB -> YUV conversion 271a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 2728b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Stub functions that can be called with various rounding values: 2738b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8ClipUV(int uv, int rounding) { 2748b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora uv = (uv + rounding + (128 << (YUV_FIX + 2))) >> (YUV_FIX + 2); 2758b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return ((uv & ~0xff) == 0) ? uv : (uv < 0) ? 0 : 255; 276a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 277a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 2781e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#ifndef USE_YUVj 2791e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 2808b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) { 281a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const int luma = 16839 * r + 33059 * g + 6420 * b; 2828b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return (luma + rounding + (16 << YUV_FIX)) >> YUV_FIX; // no need to clip 283a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 284a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 2858b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8RGBToU(int r, int g, int b, int rounding) { 2861e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora const int u = -9719 * r - 19081 * g + 28800 * b; 2878b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return VP8ClipUV(u, rounding); 2881e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora} 2891e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 2908b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8RGBToV(int r, int g, int b, int rounding) { 2911e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora const int v = +28800 * r - 24116 * g - 4684 * b; 2928b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return VP8ClipUV(v, rounding); 2931e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora} 2941e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 2951e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#else 2961e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 2971e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// This JPEG-YUV colorspace, only for comparison! 2988b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// These are also 16bit precision coefficients from Rec.601, but with full 2991e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora// [0..255] output range. 3008b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) { 3011e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora const int luma = 19595 * r + 38470 * g + 7471 * b; 3028b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return (luma + rounding) >> YUV_FIX; // no need to clip 3031e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora} 3041e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 305af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic WEBP_INLINE int VP8RGBToU(int r, int g, int b, int rounding) { 3061e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora const int u = -11058 * r - 21710 * g + 32768 * b; 3078b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return VP8ClipUV(u, rounding); 308a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 309a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 310af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic WEBP_INLINE int VP8RGBToV(int r, int g, int b, int rounding) { 3111e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora const int v = 32768 * r - 27439 * g - 5329 * b; 3128b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora return VP8ClipUV(v, rounding); 313a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 314a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 3151e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora#endif // USE_YUVj 3161e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 3178b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#ifdef __cplusplus 3189aea642eefa7a641ab8b89d953251939221d2719Eric Hassold} // extern "C" 3199aea642eefa7a641ab8b89d953251939221d2719Eric Hassold#endif 3209aea642eefa7a641ab8b89d953251939221d2719Eric Hassold 321a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#endif /* WEBP_DSP_YUV_H_ */ 322