yuv.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd
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)// 102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// The exact naming is Y'CbCr, following the ITU-R BT.601 standard. 112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// More information at: http://en.wikipedia.org/wiki/YCbCr 122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// Y = 0.2569 * R + 0.5044 * G + 0.0979 * B + 16 132a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// U = -0.1483 * R - 0.2911 * G + 0.4394 * B + 128 142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// V = 0.4394 * R - 0.3679 * G - 0.0715 * B + 128 152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// We use 16bit fixed point operations for RGB->YUV conversion. 162a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// 172a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// For the Y'CbCr to RGB conversion, the BT.601 specification reads: 182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// R = 1.164 * (Y-16) + 1.596 * (V-128) 192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// G = 1.164 * (Y-16) - 0.813 * (V-128) - 0.391 * (U-128) 202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// B = 1.164 * (Y-16) + 2.018 * (U-128) 212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// where Y is in the [16,235] range, and U/V in the [16,240] range. 222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// In the table-lookup version (WEBP_YUV_USE_TABLE), the common factor 232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// "1.164 * (Y-16)" can be handled as an offset in the VP8kClip[] table. 242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// So in this case the formulae should be read as: 252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// R = 1.164 * [Y + 1.371 * (V-128) ] - 18.624 262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// G = 1.164 * [Y - 0.698 * (V-128) - 0.336 * (U-128)] - 18.624 272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// B = 1.164 * [Y + 1.733 * (U-128)] - 18.624 282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// once factorized. Here too, 16bit fixed precision is used. 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Author: Skal (pascal.massimino@gmail.com) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef WEBP_DSP_YUV_H_ 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define WEBP_DSP_YUV_H_ 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "../dec/decode_vp8.h" 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// Define the following to use the LUT-based code: 382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define WEBP_YUV_USE_TABLE 392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#if defined(WEBP_EXPERIMENTAL_FEATURES) 412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// Do NOT activate this feature for real compression. This is only experimental! 422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// This flag is for comparison purpose against JPEG's "YUVj" natural colorspace. 432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// This colorspace is close to Rec.601's Y'CbCr model with the notable 442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// difference of allowing larger range for luma/chroma. 452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// See http://en.wikipedia.org/wiki/YCbCr#JPEG_conversion paragraph, and its 462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// difference with http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion 472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// #define USE_YUVj 482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// YUV -> RGB conversion 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(__cplusplus) || defined(c_plusplus) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern "C" { 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum { YUV_FIX = 16, // fixed-point precision 582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) YUV_HALF = 1 << (YUV_FIX - 1), 592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) YUV_MASK = (256 << YUV_FIX) - 1, 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) YUV_RANGE_MIN = -227, // min value of r/g/b output 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) YUV_RANGE_MAX = 256 + 226 // max value of r/g/b output 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifdef WEBP_YUV_USE_TABLE 652a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern int16_t VP8kVToR[256], VP8kUToB[256]; 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern int32_t VP8kVToG[256], VP8kUToG[256]; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN]; 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN]; 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToRgb(uint8_t y, uint8_t u, uint8_t v, 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const rgb) { 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) rgb[0] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgb[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgb[2] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE void VP8YuvToBgr(uint8_t y, uint8_t u, uint8_t v, 822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) uint8_t* const bgr) { 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int r_off = VP8kVToR[v]; 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int b_off = VP8kUToB[u]; 862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bgr[0] = VP8kClip[y + b_off - YUV_RANGE_MIN]; 872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bgr[1] = VP8kClip[y + g_off - YUV_RANGE_MIN]; 882a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bgr[2] = VP8kClip[y + r_off - YUV_RANGE_MIN]; 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE void VP8YuvToRgb565(uint8_t y, uint8_t u, uint8_t v, 922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) uint8_t* const rgb) { 932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int r_off = VP8kVToR[v]; 942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int b_off = VP8kUToB[u]; 962a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t rg = ((VP8kClip[y + r_off - YUV_RANGE_MIN] & 0xf8) | 972a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) (VP8kClip[y + g_off - YUV_RANGE_MIN] >> 5)); 982a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t gb = (((VP8kClip[y + g_off - YUV_RANGE_MIN] << 3) & 0xe0) | 992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) (VP8kClip[y + b_off - YUV_RANGE_MIN] >> 3)); 1002a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifdef WEBP_SWAP_16BIT_CSP 1012a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[0] = gb; 1022a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[1] = rg; 1032a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#else 1042a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[0] = rg; 1052a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[1] = gb; 1062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToRgba4444(uint8_t y, uint8_t u, uint8_t v, 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const argb) { 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int r_off = VP8kVToR[v]; 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX; 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int b_off = VP8kUToB[u]; 1142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t rg = ((VP8kClip4Bits[y + r_off - YUV_RANGE_MIN] << 4) | 1152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) VP8kClip4Bits[y + g_off - YUV_RANGE_MIN]); 1162a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t ba = (VP8kClip4Bits[y + b_off - YUV_RANGE_MIN] << 4) | 0x0f; 1172a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifdef WEBP_SWAP_16BIT_CSP 1182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[0] = ba; 1192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[1] = rg; 1202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#else 1212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[0] = rg; 1222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[1] = ba; 1232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 1242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#else // Table-free version (slower on x86) 1272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// These constants are 16b fixed-point version of ITU-R BT.601 constants 1292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kYScale 76309 // 1.164 = 255 / 219 1302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kVToR 104597 // 1.596 = 255 / 112 * 0.701 1312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kUToG 25674 // 0.391 = 255 / 112 * 0.886 * 0.114 / 0.587 1322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kVToG 53278 // 0.813 = 255 / 112 * 0.701 * 0.299 / 0.587 1332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kUToB 132201 // 2.018 = 255 / 112 * 0.886 1342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kRCst (-kYScale * 16 - kVToR * 128 + YUV_HALF) 1352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kGCst (-kYScale * 16 + kUToG * 128 + kVToG * 128 + YUV_HALF) 1362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define kBCst (-kYScale * 16 - kUToB * 128 + YUV_HALF) 1372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE uint8_t VP8Clip8(int v) { 1392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return ((v & ~YUV_MASK) == 0) ? (uint8_t)(v >> YUV_FIX) 1402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) : (v < 0) ? 0u : 255u; 1412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE uint8_t VP8ClipN(int v, int N) { // clip to N bits 1442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return ((v & ~YUV_MASK) == 0) ? (uint8_t)(v >> (YUV_FIX + (8 - N))) 1452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) : (v < 0) ? 0u : (255u >> (8 - N)); 1462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE int VP8YUVToR(int y, int v) { 1492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return kYScale * y + kVToR * v + kRCst; 1502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE int VP8YUVToG(int y, int u, int v) { 1532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return kYScale * y - kUToG * u - kVToG * v + kGCst; 1542a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1552a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1562a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE int VP8YUVToB(int y, int u) { 1572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return kYScale * y + kUToB * u + kBCst; 1582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1602a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE void VP8YuvToRgb(uint8_t y, uint8_t u, uint8_t v, 1612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) uint8_t* const rgb) { 1622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[0] = VP8Clip8(VP8YUVToR(y, v)); 1632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[1] = VP8Clip8(VP8YUVToG(y, u, v)); 1642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[2] = VP8Clip8(VP8YUVToB(y, u)); 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToBgr(uint8_t y, uint8_t u, uint8_t v, 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const bgr) { 1692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bgr[0] = VP8Clip8(VP8YUVToB(y, u)); 1702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bgr[1] = VP8Clip8(VP8YUVToG(y, u, v)); 1712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bgr[2] = VP8Clip8(VP8YUVToR(y, v)); 1722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE void VP8YuvToRgb565(uint8_t y, uint8_t u, uint8_t v, 1752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) uint8_t* const rgb) { 1762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int r = VP8Clip8(VP8YUVToR(y, u)); 1772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int g = VP8ClipN(VP8YUVToG(y, u, v), 6); 1782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int b = VP8ClipN(VP8YUVToB(y, v), 5); 1792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t rg = (r & 0xf8) | (g >> 3); 1802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t gb = (g << 5) | b; 1812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifdef WEBP_SWAP_16BIT_CSP 1822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[0] = gb; 1832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[1] = rg; 1842a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#else 1852a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[0] = rg; 1862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) rgb[1] = gb; 1872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 1882a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1892a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1902a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE void VP8YuvToRgba4444(uint8_t y, uint8_t u, uint8_t v, 1912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) uint8_t* const argb) { 1922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int r = VP8Clip8(VP8YUVToR(y, u)); 1932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int g = VP8ClipN(VP8YUVToG(y, u, v), 4); 1942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int b = VP8Clip8(VP8YUVToB(y, v)); 1952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t rg = (r & 0xf0) | g; 1962a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const uint8_t ba = b | 0x0f; // overwrite the lower 4 bits 1972a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifdef WEBP_SWAP_16BIT_CSP 1982a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[0] = ba; 1992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[1] = rg; 2002a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#else 2012a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[0] = rg; 2022a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[1] = ba; 2032a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 2042a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 2052a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif // WEBP_YUV_USE_TABLE 2072a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2082a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE void VP8YuvToArgb(uint8_t y, uint8_t u, uint8_t v, 2092a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) uint8_t* const argb) { 2102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) argb[0] = 0xff; 2112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) VP8YuvToRgb(y, u, v, argb + 1); 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToBgra(uint8_t y, uint8_t u, uint8_t v, 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const bgra) { 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8YuvToBgr(y, u, v, bgra); 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bgra[3] = 0xff; 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE void VP8YuvToRgba(uint8_t y, uint8_t u, uint8_t v, 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const rgba) { 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8YuvToRgb(y, u, v, rgba); 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rgba[3] = 0xff; 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Must be called before everything, to initialize the tables. 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void VP8YUVInit(void); 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// RGB -> YUV conversion 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8ClipUV(int v) { 2332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) v = (v + (257 << (YUV_FIX + 2 - 1))) >> (YUV_FIX + 2); 2342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return ((v & ~0xff) == 0) ? v : (v < 0) ? 0 : 255; 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifndef USE_YUVj 2382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8RGBToY(int r, int g, int b) { 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int kRound = (1 << (YUV_FIX - 1)) + (16 << YUV_FIX); 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int luma = 16839 * r + 33059 * g + 6420 * b; 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (luma + kRound) >> YUV_FIX; // no need to clip 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8RGBToU(int r, int g, int b) { 2462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int u = -9719 * r - 19081 * g + 28800 * b; 2472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return VP8ClipUV(u); 2482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 2492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE int VP8RGBToV(int r, int g, int b) { 2512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int v = +28800 * r - 24116 * g - 4684 * b; 2522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return VP8ClipUV(v); 2532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 2542a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2552a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#else 2562a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// This JPEG-YUV colorspace, only for comparison! 2582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// These are also 16-bit precision coefficients from Rec.601, but with full 2592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// [0..255] output range. 2602a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE int VP8RGBToY(int r, int g, int b) { 2612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int kRound = (1 << (YUV_FIX - 1)); 2622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int luma = 19595 * r + 38470 * g + 7471 * b; 2632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return (luma + kRound) >> YUV_FIX; // no need to clip 2642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 2652a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2662a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static WEBP_INLINE int VP8RGBToU(int r, int g, int b) { 2672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int u = -11058 * r - 21710 * g + 32768 * b; 2682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return VP8ClipUV(u); 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE int VP8RGBToV(int r, int g, int b) { 2722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int v = 32768 * r - 27439 * g - 5329 * b; 2732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return VP8ClipUV(v); 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif // USE_YUVj 2772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(__cplusplus) || defined(c_plusplus) 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // extern "C" 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* WEBP_DSP_YUV_H_ */ 283