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- // 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
- //------------------------------------------------------------------------------
- #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
- };
- //------------------------------------------------------------------------------
- // Main calls
- extern void WebPInitUpsamplersSSE2(void);
- extern void WebPInitUpsamplersNEON(void);
- 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;
- WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
- WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
- WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
- WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
- // 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
- }
- //------------------------------------------------------------------------------
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