1// Copyright 2011 Google Inc. All Rights Reserved. 2// 3// Use of this source code is governed by a BSD-style license 4// that can be found in the COPYING file in the root of the source 5// tree. An additional intellectual property rights grant can be found 6// in the file PATENTS. All contributing project authors may 7// be found in the AUTHORS file in the root of the source tree. 8// ----------------------------------------------------------------------------- 9// 10// YUV to RGB upsampling functions. 11// 12// Author: somnath@google.com (Somnath Banerjee) 13 14#include "./dsp.h" 15#include "./yuv.h" 16 17#include <assert.h> 18 19//------------------------------------------------------------------------------ 20// Fancy upsampler 21 22#ifdef FANCY_UPSAMPLING 23 24// Fancy upsampling functions to convert YUV to RGB 25WebPUpsampleLinePairFunc WebPUpsamplers[MODE_LAST]; 26 27// Given samples laid out in a square as: 28// [a b] 29// [c d] 30// we interpolate u/v as: 31// ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16 32// ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16 33 34// We process u and v together stashed into 32bit (16bit each). 35#define LOAD_UV(u, v) ((u) | ((v) << 16)) 36 37#define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ 38static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \ 39 const uint8_t* top_u, const uint8_t* top_v, \ 40 const uint8_t* cur_u, const uint8_t* cur_v, \ 41 uint8_t* top_dst, uint8_t* bottom_dst, int len) { \ 42 int x; \ 43 const int last_pixel_pair = (len - 1) >> 1; \ 44 uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \ 45 uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \ 46 assert(top_y != NULL); \ 47 { \ 48 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ 49 FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \ 50 } \ 51 if (bottom_y != NULL) { \ 52 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ 53 FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \ 54 } \ 55 for (x = 1; x <= last_pixel_pair; ++x) { \ 56 const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \ 57 const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \ 58 /* precompute invariant values associated with first and second diagonals*/\ 59 const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \ 60 const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \ 61 const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \ 62 { \ 63 const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \ 64 const uint32_t uv1 = (diag_03 + t_uv) >> 1; \ 65 FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ 66 top_dst + (2 * x - 1) * XSTEP); \ 67 FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \ 68 top_dst + (2 * x - 0) * XSTEP); \ 69 } \ 70 if (bottom_y != NULL) { \ 71 const uint32_t uv0 = (diag_03 + l_uv) >> 1; \ 72 const uint32_t uv1 = (diag_12 + uv) >> 1; \ 73 FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ 74 bottom_dst + (2 * x - 1) * XSTEP); \ 75 FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \ 76 bottom_dst + (2 * x + 0) * XSTEP); \ 77 } \ 78 tl_uv = t_uv; \ 79 l_uv = uv; \ 80 } \ 81 if (!(len & 1)) { \ 82 { \ 83 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ 84 FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ 85 top_dst + (len - 1) * XSTEP); \ 86 } \ 87 if (bottom_y != NULL) { \ 88 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ 89 FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ 90 bottom_dst + (len - 1) * XSTEP); \ 91 } \ 92 } \ 93} 94 95// All variants implemented. 96UPSAMPLE_FUNC(UpsampleRgbLinePair, VP8YuvToRgb, 3) 97UPSAMPLE_FUNC(UpsampleBgrLinePair, VP8YuvToBgr, 3) 98UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4) 99UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4) 100UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4) 101UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2) 102UPSAMPLE_FUNC(UpsampleRgb565LinePair, VP8YuvToRgb565, 2) 103 104#undef LOAD_UV 105#undef UPSAMPLE_FUNC 106 107#endif // FANCY_UPSAMPLING 108 109//------------------------------------------------------------------------------ 110 111#if !defined(FANCY_UPSAMPLING) 112#define DUAL_SAMPLE_FUNC(FUNC_NAME, FUNC) \ 113static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bot_y, \ 114 const uint8_t* top_u, const uint8_t* top_v, \ 115 const uint8_t* bot_u, const uint8_t* bot_v, \ 116 uint8_t* top_dst, uint8_t* bot_dst, int len) { \ 117 const int half_len = len >> 1; \ 118 int x; \ 119 assert(top_dst != NULL); \ 120 { \ 121 for (x = 0; x < half_len; ++x) { \ 122 FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x + 0); \ 123 FUNC(top_y[2 * x + 1], top_u[x], top_v[x], top_dst + 8 * x + 4); \ 124 } \ 125 if (len & 1) FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x); \ 126 } \ 127 if (bot_dst != NULL) { \ 128 for (x = 0; x < half_len; ++x) { \ 129 FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x + 0); \ 130 FUNC(bot_y[2 * x + 1], bot_u[x], bot_v[x], bot_dst + 8 * x + 4); \ 131 } \ 132 if (len & 1) FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x); \ 133 } \ 134} 135 136DUAL_SAMPLE_FUNC(DualLineSamplerBGRA, VP8YuvToBgra) 137DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb) 138#undef DUAL_SAMPLE_FUNC 139 140#endif // !FANCY_UPSAMPLING 141 142WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) { 143 WebPInitUpsamplers(); 144 VP8YUVInit(); 145#ifdef FANCY_UPSAMPLING 146 return WebPUpsamplers[alpha_is_last ? MODE_BGRA : MODE_ARGB]; 147#else 148 return (alpha_is_last ? DualLineSamplerBGRA : DualLineSamplerARGB); 149#endif 150} 151 152//------------------------------------------------------------------------------ 153// YUV444 converter 154 155#define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \ 156static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ 157 uint8_t* dst, int len) { \ 158 int i; \ 159 for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \ 160} 161 162YUV444_FUNC(Yuv444ToRgb, VP8YuvToRgb, 3) 163YUV444_FUNC(Yuv444ToBgr, VP8YuvToBgr, 3) 164YUV444_FUNC(Yuv444ToRgba, VP8YuvToRgba, 4) 165YUV444_FUNC(Yuv444ToBgra, VP8YuvToBgra, 4) 166YUV444_FUNC(Yuv444ToArgb, VP8YuvToArgb, 4) 167YUV444_FUNC(Yuv444ToRgba4444, VP8YuvToRgba4444, 2) 168YUV444_FUNC(Yuv444ToRgb565, VP8YuvToRgb565, 2) 169 170#undef YUV444_FUNC 171 172const WebPYUV444Converter WebPYUV444Converters[MODE_LAST] = { 173 Yuv444ToRgb, // MODE_RGB 174 Yuv444ToRgba, // MODE_RGBA 175 Yuv444ToBgr, // MODE_BGR 176 Yuv444ToBgra, // MODE_BGRA 177 Yuv444ToArgb, // MODE_ARGB 178 Yuv444ToRgba4444, // MODE_RGBA_4444 179 Yuv444ToRgb565, // MODE_RGB_565 180 Yuv444ToRgba, // MODE_rgbA 181 Yuv444ToBgra, // MODE_bgrA 182 Yuv444ToArgb, // MODE_Argb 183 Yuv444ToRgba4444 // MODE_rgbA_4444 184}; 185 186//------------------------------------------------------------------------------ 187// Main calls 188 189extern void WebPInitUpsamplersSSE2(void); 190extern void WebPInitUpsamplersNEON(void); 191 192void WebPInitUpsamplers(void) { 193#ifdef FANCY_UPSAMPLING 194 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; 195 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; 196 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; 197 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; 198 WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair; 199 WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair; 200 WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair; 201 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; 202 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; 203 WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair; 204 WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair; 205 206 // If defined, use CPUInfo() to overwrite some pointers with faster versions. 207 if (VP8GetCPUInfo != NULL) { 208#if defined(WEBP_USE_SSE2) 209 if (VP8GetCPUInfo(kSSE2)) { 210 WebPInitUpsamplersSSE2(); 211 } 212#endif 213#if defined(WEBP_USE_NEON) 214 if (VP8GetCPUInfo(kNEON)) { 215 WebPInitUpsamplersNEON(); 216 } 217#endif 218 } 219#endif // FANCY_UPSAMPLING 220} 221 222//------------------------------------------------------------------------------ 223