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Diffstat (limited to 'src/3rdparty/libwebp/src/dsp/upsampling.c')
| -rw-r--r-- | src/3rdparty/libwebp/src/dsp/upsampling.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/src/3rdparty/libwebp/src/dsp/upsampling.c b/src/3rdparty/libwebp/src/dsp/upsampling.c new file mode 100644 index 0000000..978e3ce --- /dev/null +++ b/src/3rdparty/libwebp/src/dsp/upsampling.c @@ -0,0 +1,366 @@ +// 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 <assert.h> + +//------------------------------------------------------------------------------ +// 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 +} + |