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- // Copyright 2010 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->RGB conversion functions
- //
- // Author: Skal (pascal.massimino@gmail.com)
- #include "./yuv.h"
- #if defined(WEBP_YUV_USE_TABLE)
- static int done = 0;
- static WEBP_INLINE uint8_t clip(int v, int max_value) {
- return v < 0 ? 0 : v > max_value ? max_value : v;
- }
- int16_t VP8kVToR[256], VP8kUToB[256];
- int32_t VP8kVToG[256], VP8kUToG[256];
- uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
- uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
- void VP8YUVInit(void) {
- int i;
- if (done) {
- return;
- }
- #ifndef USE_YUVj
- for (i = 0; i < 256; ++i) {
- VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX;
- VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF;
- VP8kVToG[i] = -45773 * (i - 128);
- VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX;
- }
- for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
- const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX;
- VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
- VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
- }
- #else
- for (i = 0; i < 256; ++i) {
- VP8kVToR[i] = (91881 * (i - 128) + YUV_HALF) >> YUV_FIX;
- VP8kUToG[i] = -22554 * (i - 128) + YUV_HALF;
- VP8kVToG[i] = -46802 * (i - 128);
- VP8kUToB[i] = (116130 * (i - 128) + YUV_HALF) >> YUV_FIX;
- }
- for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
- const int k = i;
- VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
- VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
- }
- #endif
- done = 1;
- }
- #else
- void VP8YUVInit(void) {}
- #endif // WEBP_YUV_USE_TABLE
- //-----------------------------------------------------------------------------
- // Plain-C version
- #define ROW_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) { \
- const uint8_t* const end = dst + (len & ~1) * XSTEP; \
- while (dst != end) { \
- FUNC(y[0], u[0], v[0], dst); \
- FUNC(y[1], u[0], v[0], dst + XSTEP); \
- y += 2; \
- ++u; \
- ++v; \
- dst += 2 * XSTEP; \
- } \
- if (len & 1) { \
- FUNC(y[0], u[0], v[0], dst); \
- } \
- } \
- // All variants implemented.
- ROW_FUNC(YuvToRgbRow, VP8YuvToRgb, 3)
- ROW_FUNC(YuvToBgrRow, VP8YuvToBgr, 3)
- ROW_FUNC(YuvToRgbaRow, VP8YuvToRgba, 4)
- ROW_FUNC(YuvToBgraRow, VP8YuvToBgra, 4)
- ROW_FUNC(YuvToArgbRow, VP8YuvToArgb, 4)
- ROW_FUNC(YuvToRgba4444Row, VP8YuvToRgba4444, 2)
- ROW_FUNC(YuvToRgb565Row, VP8YuvToRgb565, 2)
- #undef ROW_FUNC
- // Main call for processing a plane with a WebPSamplerRowFunc function:
- void WebPSamplerProcessPlane(const uint8_t* y, int y_stride,
- const uint8_t* u, const uint8_t* v, int uv_stride,
- uint8_t* dst, int dst_stride,
- int width, int height, WebPSamplerRowFunc func) {
- int j;
- for (j = 0; j < height; ++j) {
- func(y, u, v, dst, width);
- y += y_stride;
- if (j & 1) {
- u += uv_stride;
- v += uv_stride;
- }
- dst += dst_stride;
- }
- }
- //-----------------------------------------------------------------------------
- // Main call
- WebPSamplerRowFunc WebPSamplers[MODE_LAST];
- extern void WebPInitSamplersSSE2(void);
- extern void WebPInitSamplersMIPS32(void);
- void WebPInitSamplers(void) {
- WebPSamplers[MODE_RGB] = YuvToRgbRow;
- WebPSamplers[MODE_RGBA] = YuvToRgbaRow;
- WebPSamplers[MODE_BGR] = YuvToBgrRow;
- WebPSamplers[MODE_BGRA] = YuvToBgraRow;
- WebPSamplers[MODE_ARGB] = YuvToArgbRow;
- WebPSamplers[MODE_RGBA_4444] = YuvToRgba4444Row;
- WebPSamplers[MODE_RGB_565] = YuvToRgb565Row;
- WebPSamplers[MODE_rgbA] = YuvToRgbaRow;
- WebPSamplers[MODE_bgrA] = YuvToBgraRow;
- WebPSamplers[MODE_Argb] = YuvToArgbRow;
- WebPSamplers[MODE_rgbA_4444] = YuvToRgba4444Row;
- // If defined, use CPUInfo() to overwrite some pointers with faster versions.
- if (VP8GetCPUInfo != NULL) {
- #if defined(WEBP_USE_SSE2)
- if (VP8GetCPUInfo(kSSE2)) {
- WebPInitSamplersSSE2();
- }
- #endif // WEBP_USE_SSE2
- #if defined(WEBP_USE_MIPS32)
- if (VP8GetCPUInfo(kMIPS32)) {
- WebPInitSamplersMIPS32();
- }
- #endif // WEBP_USE_MIPS32
- }
- }
- //-----------------------------------------------------------------------------
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