1 // Copyright 2010 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->RGB conversion functions 11 // 12 // Author: Skal (pascal.massimino (at) gmail.com) 13 14 #include "./yuv.h" 15 16 #if defined(WEBP_YUV_USE_TABLE) 17 18 static int done = 0; 19 20 static WEBP_INLINE uint8_t clip(int v, int max_value) { 21 return v < 0 ? 0 : v > max_value ? max_value : v; 22 } 23 24 int16_t VP8kVToR[256], VP8kUToB[256]; 25 int32_t VP8kVToG[256], VP8kUToG[256]; 26 uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN]; 27 uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN]; 28 29 void VP8YUVInit(void) { 30 int i; 31 if (done) { 32 return; 33 } 34 #ifndef USE_YUVj 35 for (i = 0; i < 256; ++i) { 36 VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX; 37 VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF; 38 VP8kVToG[i] = -45773 * (i - 128); 39 VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX; 40 } 41 for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) { 42 const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX; 43 VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255); 44 VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15); 45 } 46 #else 47 for (i = 0; i < 256; ++i) { 48 VP8kVToR[i] = (91881 * (i - 128) + YUV_HALF) >> YUV_FIX; 49 VP8kUToG[i] = -22554 * (i - 128) + YUV_HALF; 50 VP8kVToG[i] = -46802 * (i - 128); 51 VP8kUToB[i] = (116130 * (i - 128) + YUV_HALF) >> YUV_FIX; 52 } 53 for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) { 54 const int k = i; 55 VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255); 56 VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15); 57 } 58 #endif 59 60 done = 1; 61 } 62 63 #else 64 65 void VP8YUVInit(void) {} 66 67 #endif // WEBP_YUV_USE_TABLE 68 69 //----------------------------------------------------------------------------- 70 // Plain-C version 71 72 #define ROW_FUNC(FUNC_NAME, FUNC, XSTEP) \ 73 static void FUNC_NAME(const uint8_t* y, \ 74 const uint8_t* u, const uint8_t* v, \ 75 uint8_t* dst, int len) { \ 76 const uint8_t* const end = dst + (len & ~1) * XSTEP; \ 77 while (dst != end) { \ 78 FUNC(y[0], u[0], v[0], dst); \ 79 FUNC(y[1], u[0], v[0], dst + XSTEP); \ 80 y += 2; \ 81 ++u; \ 82 ++v; \ 83 dst += 2 * XSTEP; \ 84 } \ 85 if (len & 1) { \ 86 FUNC(y[0], u[0], v[0], dst); \ 87 } \ 88 } \ 89 90 // All variants implemented. 91 ROW_FUNC(YuvToRgbRow, VP8YuvToRgb, 3) 92 ROW_FUNC(YuvToBgrRow, VP8YuvToBgr, 3) 93 ROW_FUNC(YuvToRgbaRow, VP8YuvToRgba, 4) 94 ROW_FUNC(YuvToBgraRow, VP8YuvToBgra, 4) 95 ROW_FUNC(YuvToArgbRow, VP8YuvToArgb, 4) 96 ROW_FUNC(YuvToRgba4444Row, VP8YuvToRgba4444, 2) 97 ROW_FUNC(YuvToRgb565Row, VP8YuvToRgb565, 2) 98 99 #undef ROW_FUNC 100 101 // Main call for processing a plane with a WebPSamplerRowFunc function: 102 void WebPSamplerProcessPlane(const uint8_t* y, int y_stride, 103 const uint8_t* u, const uint8_t* v, int uv_stride, 104 uint8_t* dst, int dst_stride, 105 int width, int height, WebPSamplerRowFunc func) { 106 int j; 107 for (j = 0; j < height; ++j) { 108 func(y, u, v, dst, width); 109 y += y_stride; 110 if (j & 1) { 111 u += uv_stride; 112 v += uv_stride; 113 } 114 dst += dst_stride; 115 } 116 } 117 118 //----------------------------------------------------------------------------- 119 // Main call 120 121 WebPSamplerRowFunc WebPSamplers[MODE_LAST]; 122 123 extern void WebPInitSamplersSSE2(void); 124 extern void WebPInitSamplersMIPS32(void); 125 126 void WebPInitSamplers(void) { 127 WebPSamplers[MODE_RGB] = YuvToRgbRow; 128 WebPSamplers[MODE_RGBA] = YuvToRgbaRow; 129 WebPSamplers[MODE_BGR] = YuvToBgrRow; 130 WebPSamplers[MODE_BGRA] = YuvToBgraRow; 131 WebPSamplers[MODE_ARGB] = YuvToArgbRow; 132 WebPSamplers[MODE_RGBA_4444] = YuvToRgba4444Row; 133 WebPSamplers[MODE_RGB_565] = YuvToRgb565Row; 134 WebPSamplers[MODE_rgbA] = YuvToRgbaRow; 135 WebPSamplers[MODE_bgrA] = YuvToBgraRow; 136 WebPSamplers[MODE_Argb] = YuvToArgbRow; 137 WebPSamplers[MODE_rgbA_4444] = YuvToRgba4444Row; 138 139 // If defined, use CPUInfo() to overwrite some pointers with faster versions. 140 if (VP8GetCPUInfo != NULL) { 141 #if defined(WEBP_USE_SSE2) 142 if (VP8GetCPUInfo(kSSE2)) { 143 WebPInitSamplersSSE2(); 144 } 145 #endif // WEBP_USE_SSE2 146 #if defined(WEBP_USE_MIPS32) 147 if (VP8GetCPUInfo(kMIPS32)) { 148 WebPInitSamplersMIPS32(); 149 } 150 #endif // WEBP_USE_MIPS32 151 } 152 } 153 154 //----------------------------------------------------------------------------- 155
