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-rw-r--r--media/libwebp/src/dsp/yuv.c244
1 files changed, 244 insertions, 0 deletions
diff --git a/media/libwebp/src/dsp/yuv.c b/media/libwebp/src/dsp/yuv.c
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index 0000000000..d16c13d3ca
--- /dev/null
+++ b/media/libwebp/src/dsp/yuv.c
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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 "src/dsp/yuv.h"
+
+#include <assert.h>
+#include <stdlib.h>
+
+//-----------------------------------------------------------------------------
+// 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 WebPInitSamplersSSE41(void);
+extern void WebPInitSamplersMIPS32(void);
+extern void WebPInitSamplersMIPSdspR2(void);
+
+WEBP_DSP_INIT_FUNC(WebPInitSamplers) {
+ 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_HAVE_SSE2)
+ if (VP8GetCPUInfo(kSSE2)) {
+ WebPInitSamplersSSE2();
+ }
+#endif // WEBP_HAVE_SSE2
+#if defined(WEBP_HAVE_SSE41)
+ if (VP8GetCPUInfo(kSSE4_1)) {
+ WebPInitSamplersSSE41();
+ }
+#endif // WEBP_HAVE_SSE41
+#if defined(WEBP_USE_MIPS32)
+ if (VP8GetCPUInfo(kMIPS32)) {
+ WebPInitSamplersMIPS32();
+ }
+#endif // WEBP_USE_MIPS32
+#if defined(WEBP_USE_MIPS_DSP_R2)
+ if (VP8GetCPUInfo(kMIPSdspR2)) {
+ WebPInitSamplersMIPSdspR2();
+ }
+#endif // WEBP_USE_MIPS_DSP_R2
+ }
+}
+
+//-----------------------------------------------------------------------------
+// ARGB -> YUV converters
+
+static void ConvertARGBToY_C(const uint32_t* argb, uint8_t* y, int width) {
+ int i;
+ for (i = 0; i < width; ++i) {
+ const uint32_t p = argb[i];
+ y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >> 0) & 0xff,
+ YUV_HALF);
+ }
+}
+
+void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v,
+ int src_width, int do_store) {
+ // No rounding. Last pixel is dealt with separately.
+ const int uv_width = src_width >> 1;
+ int i;
+ for (i = 0; i < uv_width; ++i) {
+ const uint32_t v0 = argb[2 * i + 0];
+ const uint32_t v1 = argb[2 * i + 1];
+ // VP8RGBToU/V expects four accumulated pixels. Hence we need to
+ // scale r/g/b value by a factor 2. We just shift v0/v1 one bit less.
+ const int r = ((v0 >> 15) & 0x1fe) + ((v1 >> 15) & 0x1fe);
+ const int g = ((v0 >> 7) & 0x1fe) + ((v1 >> 7) & 0x1fe);
+ const int b = ((v0 << 1) & 0x1fe) + ((v1 << 1) & 0x1fe);
+ const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);
+ const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);
+ if (do_store) {
+ u[i] = tmp_u;
+ v[i] = tmp_v;
+ } else {
+ // Approximated average-of-four. But it's an acceptable diff.
+ u[i] = (u[i] + tmp_u + 1) >> 1;
+ v[i] = (v[i] + tmp_v + 1) >> 1;
+ }
+ }
+ if (src_width & 1) { // last pixel
+ const uint32_t v0 = argb[2 * i + 0];
+ const int r = (v0 >> 14) & 0x3fc;
+ const int g = (v0 >> 6) & 0x3fc;
+ const int b = (v0 << 2) & 0x3fc;
+ const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);
+ const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);
+ if (do_store) {
+ u[i] = tmp_u;
+ v[i] = tmp_v;
+ } else {
+ u[i] = (u[i] + tmp_u + 1) >> 1;
+ v[i] = (v[i] + tmp_v + 1) >> 1;
+ }
+ }
+}
+
+//-----------------------------------------------------------------------------
+
+static void ConvertRGB24ToY_C(const uint8_t* rgb, uint8_t* y, int width) {
+ int i;
+ for (i = 0; i < width; ++i, rgb += 3) {
+ y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);
+ }
+}
+
+static void ConvertBGR24ToY_C(const uint8_t* bgr, uint8_t* y, int width) {
+ int i;
+ for (i = 0; i < width; ++i, bgr += 3) {
+ y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);
+ }
+}
+
+void WebPConvertRGBA32ToUV_C(const uint16_t* rgb,
+ uint8_t* u, uint8_t* v, int width) {
+ int i;
+ for (i = 0; i < width; i += 1, rgb += 4) {
+ const int r = rgb[0], g = rgb[1], b = rgb[2];
+ u[i] = VP8RGBToU(r, g, b, YUV_HALF << 2);
+ v[i] = VP8RGBToV(r, g, b, YUV_HALF << 2);
+ }
+}
+
+//-----------------------------------------------------------------------------
+
+void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width);
+void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width);
+void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb,
+ uint8_t* u, uint8_t* v, int width);
+
+void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width);
+void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v,
+ int src_width, int do_store);
+
+extern void WebPInitConvertARGBToYUVSSE2(void);
+extern void WebPInitConvertARGBToYUVSSE41(void);
+extern void WebPInitConvertARGBToYUVNEON(void);
+
+WEBP_DSP_INIT_FUNC(WebPInitConvertARGBToYUV) {
+ WebPConvertARGBToY = ConvertARGBToY_C;
+ WebPConvertARGBToUV = WebPConvertARGBToUV_C;
+
+ WebPConvertRGB24ToY = ConvertRGB24ToY_C;
+ WebPConvertBGR24ToY = ConvertBGR24ToY_C;
+
+ WebPConvertRGBA32ToUV = WebPConvertRGBA32ToUV_C;
+
+ if (VP8GetCPUInfo != NULL) {
+#if defined(WEBP_HAVE_SSE2)
+ if (VP8GetCPUInfo(kSSE2)) {
+ WebPInitConvertARGBToYUVSSE2();
+ }
+#endif // WEBP_HAVE_SSE2
+#if defined(WEBP_HAVE_SSE41)
+ if (VP8GetCPUInfo(kSSE4_1)) {
+ WebPInitConvertARGBToYUVSSE41();
+ }
+#endif // WEBP_HAVE_SSE41
+ }
+
+#if defined(WEBP_HAVE_NEON)
+ if (WEBP_NEON_OMIT_C_CODE ||
+ (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+ WebPInitConvertARGBToYUVNEON();
+ }
+#endif // WEBP_HAVE_NEON
+
+ assert(WebPConvertARGBToY != NULL);
+ assert(WebPConvertARGBToUV != NULL);
+ assert(WebPConvertRGB24ToY != NULL);
+ assert(WebPConvertBGR24ToY != NULL);
+ assert(WebPConvertRGBA32ToUV != NULL);
+}
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