155 lines
5.5 KiB
C
155 lines
5.5 KiB
C
// Copyright 2010 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// YUV->RGB conversion functions
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "./yuv.h"
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#if defined(WEBP_YUV_USE_TABLE)
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static int done = 0;
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static WEBP_INLINE uint8_t clip(int v, int max_value) {
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return v < 0 ? 0 : v > max_value ? max_value : v;
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}
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int16_t VP8kVToR[256], VP8kUToB[256];
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int32_t VP8kVToG[256], VP8kUToG[256];
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uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
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uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
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void VP8YUVInit(void) {
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int i;
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if (done) {
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return;
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}
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#ifndef USE_YUVj
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for (i = 0; i < 256; ++i) {
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VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX;
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VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF;
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VP8kVToG[i] = -45773 * (i - 128);
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VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX;
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}
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for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
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const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX;
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VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
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VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
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}
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#else
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for (i = 0; i < 256; ++i) {
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VP8kVToR[i] = (91881 * (i - 128) + YUV_HALF) >> YUV_FIX;
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VP8kUToG[i] = -22554 * (i - 128) + YUV_HALF;
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VP8kVToG[i] = -46802 * (i - 128);
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VP8kUToB[i] = (116130 * (i - 128) + YUV_HALF) >> YUV_FIX;
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}
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for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
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const int k = i;
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VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
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VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
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}
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#endif
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done = 1;
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}
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#else
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void VP8YUVInit(void) {}
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#endif // WEBP_YUV_USE_TABLE
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//-----------------------------------------------------------------------------
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// Plain-C version
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#define ROW_FUNC(FUNC_NAME, FUNC, XSTEP) \
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static void FUNC_NAME(const uint8_t* y, \
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const uint8_t* u, const uint8_t* v, \
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uint8_t* dst, int len) { \
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const uint8_t* const end = dst + (len & ~1) * XSTEP; \
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while (dst != end) { \
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FUNC(y[0], u[0], v[0], dst); \
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FUNC(y[1], u[0], v[0], dst + XSTEP); \
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y += 2; \
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++u; \
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++v; \
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dst += 2 * XSTEP; \
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} \
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if (len & 1) { \
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FUNC(y[0], u[0], v[0], dst); \
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} \
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} \
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// All variants implemented.
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ROW_FUNC(YuvToRgbRow, VP8YuvToRgb, 3)
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ROW_FUNC(YuvToBgrRow, VP8YuvToBgr, 3)
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ROW_FUNC(YuvToRgbaRow, VP8YuvToRgba, 4)
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ROW_FUNC(YuvToBgraRow, VP8YuvToBgra, 4)
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ROW_FUNC(YuvToArgbRow, VP8YuvToArgb, 4)
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ROW_FUNC(YuvToRgba4444Row, VP8YuvToRgba4444, 2)
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ROW_FUNC(YuvToRgb565Row, VP8YuvToRgb565, 2)
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#undef ROW_FUNC
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// Main call for processing a plane with a WebPSamplerRowFunc function:
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void WebPSamplerProcessPlane(const uint8_t* y, int y_stride,
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const uint8_t* u, const uint8_t* v, int uv_stride,
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uint8_t* dst, int dst_stride,
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int width, int height, WebPSamplerRowFunc func) {
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int j;
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for (j = 0; j < height; ++j) {
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func(y, u, v, dst, width);
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y += y_stride;
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if (j & 1) {
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u += uv_stride;
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v += uv_stride;
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}
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dst += dst_stride;
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}
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}
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//-----------------------------------------------------------------------------
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// Main call
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WebPSamplerRowFunc WebPSamplers[MODE_LAST];
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extern void WebPInitSamplersSSE2(void);
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extern void WebPInitSamplersMIPS32(void);
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void WebPInitSamplers(void) {
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WebPSamplers[MODE_RGB] = YuvToRgbRow;
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WebPSamplers[MODE_RGBA] = YuvToRgbaRow;
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WebPSamplers[MODE_BGR] = YuvToBgrRow;
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WebPSamplers[MODE_BGRA] = YuvToBgraRow;
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WebPSamplers[MODE_ARGB] = YuvToArgbRow;
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WebPSamplers[MODE_RGBA_4444] = YuvToRgba4444Row;
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WebPSamplers[MODE_RGB_565] = YuvToRgb565Row;
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WebPSamplers[MODE_rgbA] = YuvToRgbaRow;
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WebPSamplers[MODE_bgrA] = YuvToBgraRow;
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WebPSamplers[MODE_Argb] = YuvToArgbRow;
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WebPSamplers[MODE_rgbA_4444] = YuvToRgba4444Row;
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// If defined, use CPUInfo() to overwrite some pointers with faster versions.
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if (VP8GetCPUInfo != NULL) {
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#if defined(WEBP_USE_SSE2)
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if (VP8GetCPUInfo(kSSE2)) {
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WebPInitSamplersSSE2();
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}
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#endif // WEBP_USE_SSE2
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#if defined(WEBP_USE_MIPS32)
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if (VP8GetCPUInfo(kMIPS32)) {
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WebPInitSamplersMIPS32();
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}
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#endif // WEBP_USE_MIPS32
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}
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}
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//-----------------------------------------------------------------------------
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