yuv.h revision 9aea642eefa7a641ab8b89d953251939221d2719
1ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// Copyright 2010 Google Inc. 2ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// 3ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// This code is licensed under the same terms as WebM: 4ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// Software License Agreement: http://www.webmproject.org/license/software/ 5ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ 6ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// ----------------------------------------------------------------------------- 7ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// 8ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// inline YUV->RGB conversion function 9ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// 10ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// Author: Skal (pascal.massimino@gmail.com) 11ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 12ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifndef WEBP_DECODE_YUV_H_ 13ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#define WEBP_DECODE_YUV_H_ 14ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 15ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "webp/decode_vp8.h" 16ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 17ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#if defined(__cplusplus) || defined(c_plusplus) 18ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovextern "C" { 19ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif 20ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 21ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovenum { YUV_FIX = 16, // fixed-point precision 22ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov YUV_RANGE_MIN = -227, // min value of r/g/b output 23ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov YUV_RANGE_MAX = 256 + 226 // max value of r/g/b output 24ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}; 25ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovextern int16_t VP8kVToR[256], VP8kUToB[256]; 26ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovextern int32_t VP8kVToG[256], VP8kUToG[256]; 27ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovextern uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN]; 28ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 29ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovinline static void VP8YuvToRgb(uint8_t y, uint8_t u, uint8_t v, 30ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov uint8_t* const rgb) { 31ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov const int r_off = VP8kVToR[v]; 32ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 33ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov const int b_off = VP8kUToB[u]; 34ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov rgb[0] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 35ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov rgb[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 36ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov rgb[2] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 37ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} 38ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 39ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovinline static void VP8YuvToRgba(int y, int u, int v, uint8_t* const rgba) { 40ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov VP8YuvToRgb(y, u, v, rgba); 41ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov rgba[3] = 0xff; 42ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} 43ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 44ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovinline static void VP8YuvToBgr(uint8_t y, uint8_t u, uint8_t v, 45ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov uint8_t* const bgr) { 46ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov const int r_off = VP8kVToR[v]; 47ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 48ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov const int b_off = VP8kUToB[u]; 49ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov bgr[0] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 50ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov bgr[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 51ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov bgr[2] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 52ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} 53ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 54ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovinline static void VP8YuvToBgra(int y, int u, int v, uint8_t* const bgra) { 55ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov VP8YuvToBgr(y, u, v, bgra); 56ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov bgra[3] = 0xff; 57ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} 58ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 59ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov// Must be called before everything, to initialize the tables. 60ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovvoid VP8YUVInit(); 61ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 62ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#if defined(__cplusplus) || defined(c_plusplus) 63ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} // extern "C" 64ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif 65ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 66ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif // WEBP_DECODE_YUV_H_ 67ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov