yuv.h revision 5821806d5e7f356e8fa4b058a389a808ea183019
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright 2010 Google Inc. All Rights Reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This code is licensed under the same terms as WebM: 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Software License Agreement: http://www.webmproject.org/license/software/ 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// ----------------------------------------------------------------------------- 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// inline YUV<->RGB conversion function 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Author: Skal (pascal.massimino@gmail.com) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef WEBP_DSP_YUV_H_ 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define WEBP_DSP_YUV_H_ 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "../dec/decode_vp8.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// YUV -> RGB conversion 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(__cplusplus) || defined(c_plusplus) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern "C" { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum { YUV_FIX = 16, // fixed-point precision 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) YUV_RANGE_MIN = -227, // min value of r/g/b output 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) YUV_RANGE_MAX = 256 + 226 // max value of r/g/b output 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern int16_t VP8kVToR[256], VP8kUToB[256]; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern int32_t VP8kVToG[256], VP8kUToG[256]; 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN]; 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN]; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToRgb(uint8_t y, uint8_t u, uint8_t v, 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const rgb) { 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int r_off = VP8kVToR[v]; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int b_off = VP8kUToB[u]; 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgb[0] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgb[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgb[2] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToRgb565(uint8_t y, uint8_t u, uint8_t v, 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const rgb) { 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int r_off = VP8kVToR[v]; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int b_off = VP8kUToB[u]; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgb[0] = ((VP8kClip[y + r_off - YUV_RANGE_MIN] & 0xf8) | 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (VP8kClip[y + g_off - YUV_RANGE_MIN] >> 5)); 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgb[1] = (((VP8kClip[y + g_off - YUV_RANGE_MIN] << 3) & 0xe0) | 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (VP8kClip[y + b_off - YUV_RANGE_MIN] >> 3)); 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToArgb(uint8_t y, uint8_t u, uint8_t v, 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const argb) { 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) argb[0] = 0xff; 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8YuvToRgb(y, u, v, argb + 1); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToRgba4444(uint8_t y, uint8_t u, uint8_t v, 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const argb) { 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int r_off = VP8kVToR[v]; 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int b_off = VP8kUToB[u]; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Don't update alpha (last 4 bits of argb[1]) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) argb[0] = ((VP8kClip4Bits[y + r_off - YUV_RANGE_MIN] << 4) | 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8kClip4Bits[y + g_off - YUV_RANGE_MIN]); 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) argb[1] = 0x0f | (VP8kClip4Bits[y + b_off - YUV_RANGE_MIN] << 4); 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToBgr(uint8_t y, uint8_t u, uint8_t v, 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const bgr) { 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int r_off = VP8kVToR[v]; 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int b_off = VP8kUToB[u]; 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bgr[0] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bgr[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bgr[2] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToBgra(uint8_t y, uint8_t u, uint8_t v, 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const bgra) { 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8YuvToBgr(y, u, v, bgra); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bgra[3] = 0xff; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToRgba(uint8_t y, uint8_t u, uint8_t v, 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const rgba) { 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8YuvToRgb(y, u, v, rgba); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgba[3] = 0xff; 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE uint32_t VP8Clip4Bits(uint8_t c) { 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint32_t v = (c + 8) >> 4; 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (v > 15) ? 15 : v; 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Must be called before everything, to initialize the tables. 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void VP8YUVInit(void); 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// RGB -> YUV conversion 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The exact naming is Y'CbCr, following the ITU-R BT.601 standard. 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// More information at: http://en.wikipedia.org/wiki/YCbCr 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Y = 0.2569 * R + 0.5044 * G + 0.0979 * B + 16 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// U = -0.1483 * R - 0.2911 * G + 0.4394 * B + 128 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// V = 0.4394 * R - 0.3679 * G - 0.0715 * B + 128 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// We use 16bit fixed point operations. 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8ClipUV(int v) { 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) v = (v + (257 << (YUV_FIX + 2 - 1))) >> (YUV_FIX + 2); 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((v & ~0xff) == 0) ? v : (v < 0) ? 0 : 255; 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8RGBToY(int r, int g, int b) { 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int kRound = (1 << (YUV_FIX - 1)) + (16 << YUV_FIX); 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int luma = 16839 * r + 33059 * g + 6420 * b; 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (luma + kRound) >> YUV_FIX; // no need to clip 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8RGBToU(int r, int g, int b) { 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8ClipUV(-9719 * r - 19081 * g + 28800 * b); 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8RGBToV(int r, int g, int b) { 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8ClipUV(+28800 * r - 24116 * g - 4684 * b); 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(__cplusplus) || defined(c_plusplus) 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // extern "C" 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* WEBP_DSP_YUV_H_ */ 134