// Copyright 2011 Google Inc. All Rights Reserved. // // Use of this source code is governed by a BSD-style license // that can be found in the COPYING file in the root of the source // tree. An additional intellectual property rights grant can be found // in the file PATENTS. All contributing project authors may // be found in the AUTHORS file in the root of the source tree. // ----------------------------------------------------------------------------- // // YUV to RGB upsampling functions. // // Author: somnath@google.com (Somnath Banerjee) #include "./dsp.h" #include "./yuv.h" #include //------------------------------------------------------------------------------ // Fancy upsampler #ifdef FANCY_UPSAMPLING // Fancy upsampling functions to convert YUV to RGB WebPUpsampleLinePairFunc WebPUpsamplers[MODE_LAST]; // Given samples laid out in a square as: // [a b] // [c d] // we interpolate u/v as: // ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16 // ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16 // We process u and v together stashed into 32bit (16bit each). #define LOAD_UV(u, v) ((u) | ((v) << 16)) #define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \ const uint8_t* top_u, const uint8_t* top_v, \ const uint8_t* cur_u, const uint8_t* cur_v, \ uint8_t* top_dst, uint8_t* bottom_dst, int len) { \ int x; \ const int last_pixel_pair = (len - 1) >> 1; \ uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \ uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \ assert(top_y != NULL); \ { \ const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \ } \ if (bottom_y != NULL) { \ const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \ } \ for (x = 1; x <= last_pixel_pair; ++x) { \ const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \ const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \ /* precompute invariant values associated with first and second diagonals*/\ const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \ const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \ const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \ { \ const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \ const uint32_t uv1 = (diag_03 + t_uv) >> 1; \ FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ top_dst + (2 * x - 1) * XSTEP); \ FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \ top_dst + (2 * x - 0) * XSTEP); \ } \ if (bottom_y != NULL) { \ const uint32_t uv0 = (diag_03 + l_uv) >> 1; \ const uint32_t uv1 = (diag_12 + uv) >> 1; \ FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ bottom_dst + (2 * x - 1) * XSTEP); \ FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \ bottom_dst + (2 * x + 0) * XSTEP); \ } \ tl_uv = t_uv; \ l_uv = uv; \ } \ if (!(len & 1)) { \ { \ const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ top_dst + (len - 1) * XSTEP); \ } \ if (bottom_y != NULL) { \ const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ bottom_dst + (len - 1) * XSTEP); \ } \ } \ } // All variants implemented. UPSAMPLE_FUNC(UpsampleRgbLinePair, VP8YuvToRgb, 3) UPSAMPLE_FUNC(UpsampleBgrLinePair, VP8YuvToBgr, 3) UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4) UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4) UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4) UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2) UPSAMPLE_FUNC(UpsampleRgb565LinePair, VP8YuvToRgb565, 2) #undef LOAD_UV #undef UPSAMPLE_FUNC #endif // FANCY_UPSAMPLING //------------------------------------------------------------------------------ // simple point-sampling #define SAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \ const uint8_t* u, const uint8_t* v, \ uint8_t* top_dst, uint8_t* bottom_dst, int len) { \ int i; \ for (i = 0; i < len - 1; i += 2) { \ FUNC(top_y[0], u[0], v[0], top_dst); \ FUNC(top_y[1], u[0], v[0], top_dst + XSTEP); \ FUNC(bottom_y[0], u[0], v[0], bottom_dst); \ FUNC(bottom_y[1], u[0], v[0], bottom_dst + XSTEP); \ top_y += 2; \ bottom_y += 2; \ u++; \ v++; \ top_dst += 2 * XSTEP; \ bottom_dst += 2 * XSTEP; \ } \ if (i == len - 1) { /* last one */ \ FUNC(top_y[0], u[0], v[0], top_dst); \ FUNC(bottom_y[0], u[0], v[0], bottom_dst); \ } \ } // All variants implemented. SAMPLE_FUNC(SampleRgbLinePair, VP8YuvToRgb, 3) SAMPLE_FUNC(SampleBgrLinePair, VP8YuvToBgr, 3) SAMPLE_FUNC(SampleRgbaLinePair, VP8YuvToRgba, 4) SAMPLE_FUNC(SampleBgraLinePair, VP8YuvToBgra, 4) SAMPLE_FUNC(SampleArgbLinePair, VP8YuvToArgb, 4) SAMPLE_FUNC(SampleRgba4444LinePair, VP8YuvToRgba4444, 2) SAMPLE_FUNC(SampleRgb565LinePair, VP8YuvToRgb565, 2) #undef SAMPLE_FUNC const WebPSampleLinePairFunc WebPSamplers[MODE_LAST] = { SampleRgbLinePair, // MODE_RGB SampleRgbaLinePair, // MODE_RGBA SampleBgrLinePair, // MODE_BGR SampleBgraLinePair, // MODE_BGRA SampleArgbLinePair, // MODE_ARGB SampleRgba4444LinePair, // MODE_RGBA_4444 SampleRgb565LinePair, // MODE_RGB_565 SampleRgbaLinePair, // MODE_rgbA SampleBgraLinePair, // MODE_bgrA SampleArgbLinePair, // MODE_Argb SampleRgba4444LinePair // MODE_rgbA_4444 }; //------------------------------------------------------------------------------ #if !defined(FANCY_UPSAMPLING) #define DUAL_SAMPLE_FUNC(FUNC_NAME, FUNC) \ static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bot_y, \ const uint8_t* top_u, const uint8_t* top_v, \ const uint8_t* bot_u, const uint8_t* bot_v, \ uint8_t* top_dst, uint8_t* bot_dst, int len) { \ const int half_len = len >> 1; \ int x; \ assert(top_dst != NULL); \ { \ for (x = 0; x < half_len; ++x) { \ FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x + 0); \ FUNC(top_y[2 * x + 1], top_u[x], top_v[x], top_dst + 8 * x + 4); \ } \ if (len & 1) FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x); \ } \ if (bot_dst != NULL) { \ for (x = 0; x < half_len; ++x) { \ FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x + 0); \ FUNC(bot_y[2 * x + 1], bot_u[x], bot_v[x], bot_dst + 8 * x + 4); \ } \ if (len & 1) FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x); \ } \ } DUAL_SAMPLE_FUNC(DualLineSamplerBGRA, VP8YuvToBgra) DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb) #undef DUAL_SAMPLE_FUNC #endif // !FANCY_UPSAMPLING WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) { WebPInitUpsamplers(); VP8YUVInit(); #ifdef FANCY_UPSAMPLING return WebPUpsamplers[alpha_is_last ? MODE_BGRA : MODE_ARGB]; #else return (alpha_is_last ? DualLineSamplerBGRA : DualLineSamplerARGB); #endif } //------------------------------------------------------------------------------ // YUV444 converter #define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \ static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ uint8_t* dst, int len) { \ int i; \ for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \ } YUV444_FUNC(Yuv444ToRgb, VP8YuvToRgb, 3) YUV444_FUNC(Yuv444ToBgr, VP8YuvToBgr, 3) YUV444_FUNC(Yuv444ToRgba, VP8YuvToRgba, 4) YUV444_FUNC(Yuv444ToBgra, VP8YuvToBgra, 4) YUV444_FUNC(Yuv444ToArgb, VP8YuvToArgb, 4) YUV444_FUNC(Yuv444ToRgba4444, VP8YuvToRgba4444, 2) YUV444_FUNC(Yuv444ToRgb565, VP8YuvToRgb565, 2) #undef YUV444_FUNC const WebPYUV444Converter WebPYUV444Converters[MODE_LAST] = { Yuv444ToRgb, // MODE_RGB Yuv444ToRgba, // MODE_RGBA Yuv444ToBgr, // MODE_BGR Yuv444ToBgra, // MODE_BGRA Yuv444ToArgb, // MODE_ARGB Yuv444ToRgba4444, // MODE_RGBA_4444 Yuv444ToRgb565, // MODE_RGB_565 Yuv444ToRgba, // MODE_rgbA Yuv444ToBgra, // MODE_bgrA Yuv444ToArgb, // MODE_Argb Yuv444ToRgba4444 // MODE_rgbA_4444 }; //------------------------------------------------------------------------------ // Premultiplied modes // non dithered-modes // (x * a * 32897) >> 23 is bit-wise equivalent to (int)(x * a / 255.) // for all 8bit x or a. For bit-wise equivalence to (int)(x * a / 255. + .5), // one can use instead: (x * a * 65793 + (1 << 23)) >> 24 #if 1 // (int)(x * a / 255.) #define MULTIPLIER(a) ((a) * 32897UL) #define PREMULTIPLY(x, m) (((x) * (m)) >> 23) #else // (int)(x * a / 255. + .5) #define MULTIPLIER(a) ((a) * 65793UL) #define PREMULTIPLY(x, m) (((x) * (m) + (1UL << 23)) >> 24) #endif static void ApplyAlphaMultiply(uint8_t* rgba, int alpha_first, int w, int h, int stride) { while (h-- > 0) { uint8_t* const rgb = rgba + (alpha_first ? 1 : 0); const uint8_t* const alpha = rgba + (alpha_first ? 0 : 3); int i; for (i = 0; i < w; ++i) { const uint32_t a = alpha[4 * i]; if (a != 0xff) { const uint32_t mult = MULTIPLIER(a); rgb[4 * i + 0] = PREMULTIPLY(rgb[4 * i + 0], mult); rgb[4 * i + 1] = PREMULTIPLY(rgb[4 * i + 1], mult); rgb[4 * i + 2] = PREMULTIPLY(rgb[4 * i + 2], mult); } } rgba += stride; } } #undef MULTIPLIER #undef PREMULTIPLY // rgbA4444 #define MULTIPLIER(a) ((a) * 0x1111) // 0x1111 ~= (1 << 16) / 15 static WEBP_INLINE uint8_t dither_hi(uint8_t x) { return (x & 0xf0) | (x >> 4); } static WEBP_INLINE uint8_t dither_lo(uint8_t x) { return (x & 0x0f) | (x << 4); } static WEBP_INLINE uint8_t multiply(uint8_t x, uint32_t m) { return (x * m) >> 16; } static void ApplyAlphaMultiply4444(uint8_t* rgba4444, int w, int h, int stride) { while (h-- > 0) { int i; for (i = 0; i < w; ++i) { const uint8_t a = (rgba4444[2 * i + 1] & 0x0f); const uint32_t mult = MULTIPLIER(a); const uint8_t r = multiply(dither_hi(rgba4444[2 * i + 0]), mult); const uint8_t g = multiply(dither_lo(rgba4444[2 * i + 0]), mult); const uint8_t b = multiply(dither_hi(rgba4444[2 * i + 1]), mult); rgba4444[2 * i + 0] = (r & 0xf0) | ((g >> 4) & 0x0f); rgba4444[2 * i + 1] = (b & 0xf0) | a; } rgba4444 += stride; } } #undef MULTIPLIER void (*WebPApplyAlphaMultiply)(uint8_t*, int, int, int, int) = ApplyAlphaMultiply; void (*WebPApplyAlphaMultiply4444)(uint8_t*, int, int, int) = ApplyAlphaMultiply4444; //------------------------------------------------------------------------------ // Main call void WebPInitUpsamplers(void) { #ifdef FANCY_UPSAMPLING WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair; WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair; WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair; // If defined, use CPUInfo() to overwrite some pointers with faster versions. if (VP8GetCPUInfo != NULL) { #if defined(WEBP_USE_SSE2) if (VP8GetCPUInfo(kSSE2)) { WebPInitUpsamplersSSE2(); } #endif #if defined(WEBP_USE_NEON) if (VP8GetCPUInfo(kNEON)) { WebPInitUpsamplersNEON(); } #endif } #endif // FANCY_UPSAMPLING } void WebPInitPremultiply(void) { WebPApplyAlphaMultiply = ApplyAlphaMultiply; WebPApplyAlphaMultiply4444 = ApplyAlphaMultiply4444; #ifdef FANCY_UPSAMPLING WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair; WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair; if (VP8GetCPUInfo != NULL) { #if defined(WEBP_USE_SSE2) if (VP8GetCPUInfo(kSSE2)) { WebPInitPremultiplySSE2(); } #endif #if defined(WEBP_USE_NEON) if (VP8GetCPUInfo(kNEON)) { WebPInitPremultiplyNEON(); } #endif } #endif // FANCY_UPSAMPLING }