| // 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" |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| extern "C" { |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // 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 */ \ |
| if (top_y) { \ |
| const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ |
| FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \ |
| } \ |
| if (bottom_y) { \ |
| 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; \ |
| if (top_y) { \ |
| 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) { \ |
| 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)) { \ |
| if (top_y) { \ |
| 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) { \ |
| 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; \ |
| if (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 |
| } |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| } // extern "C" |
| #endif |
