Implements RGB to YV12 conversion in YASM.

media/base/simd/yuv_convert.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.

[Alpha Left Google, 2011/08/22 14:16:59]

These functions should be defined in yuv_convert_sse2.cc

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/base/simd/yuv_convert.h"
+
+#include "build/build_config.h"
+#include "media/base/cpu_features.h"
+#include "media/base/simd/yuv_row.h"
+
+namespace media {
+
+namespace simd {
+
+void ConvertRGB32toYUV(const uint8* rgbframe,

[Alpha Left Google, 2011/08/22 14:16:59]

Call this ConvertRGB32toYUV_SSE2, you can call the old one
ConvertRGB32toYUV_SSE2_Old and put them side by side.

+                       uint8* yplane,
+                       uint8* uplane,
+                       uint8* vplane,
+                       int width,
+                       int height,
+                       int rgbstride,
+                       int ystride,
+                       int uvstride) {
+  for (; height >= 2; height -= 2) {
+    ConvertARGBtoYUVRow(rgbframe, yplane, uplane, vplane, width);
+    rgbframe += rgbstride;
+    yplane += ystride;
+
+    ConvertARGBtoYUVRow(rgbframe, yplane, NULL, NULL, width);
+    rgbframe += rgbstride;
+    yplane += ystride;
+
+    uplane += uvstride;
+    vplane += uvstride;
+  }
+
+  if (height)
+    ConvertARGBtoYUVRow(rgbframe, yplane, uplane, vplane, width);
+}
+
+void ConvertRGB24toYUV(const uint8* rgbframe,

[Alpha Left Google, 2011/08/22 14:16:59]

Same for this one, call it ConvertRGB24toYUV_SSE2

+                       uint8* yplane,
+                       uint8* uplane,
+                       uint8* vplane,
+                       int width,
+                       int height,
+                       int rgbstride,
+                       int ystride,
+                       int uvstride) {
+  for (; height >= 2; height -= 2) {
+    ConvertRGBtoYUVRow(rgbframe, yplane, uplane, vplane, width);
+    rgbframe += rgbstride;
+    yplane += ystride;
+
+    ConvertRGBtoYUVRow(rgbframe, yplane, NULL, NULL, width);
+    rgbframe += rgbstride;
+    yplane += ystride;
+
+    uplane += uvstride;
+    vplane += uvstride;
+  }
+
+  if (height)
+    ConvertARGBtoYUVRow(rgbframe, yplane, uplane, vplane, width);
+}
+
+void ConvertYUVtoRGB32(const uint8* y_buf,

[Alpha Left Google, 2011/08/22 14:16:59]

Call this ConvertYUVtoRGB32_SSE2.

+                       const uint8* u_buf,
+                       const uint8* v_buf,
+                       uint8* rgb_buf,
+                       int width,
+                       int height,
+                       int y_pitch,
+                       int uv_pitch,
+                       int rgb_pitch,
+                       YUVType yuv_type) {
+  if (yuv_type == YV12) {

[Alpha Left Google, 2011/08/22 14:16:59]

Please this use construct:

if (yuv_type != YV12)
  NOTIMPLMENTED();

...
to save an extra scope.

+    for (; height >= 2; height -= 2) {
+      ConvertYUVtoARGBRow(y_buf, u_buf, v_buf, rgb_buf, width);
+      rgb_buf += rgb_pitch;
+      y_buf += y_pitch;
+
+      ConvertYUVtoARGBRow(y_buf, u_buf, v_buf, rgb_buf, width);
+      rgb_buf += rgb_pitch;
+      y_buf += y_pitch;
+
+      u_buf += uv_pitch;
+      v_buf += uv_pitch;
+    }
+
+    if (height)
+      ConvertYUVtoARGBRow(y_buf, u_buf, v_buf, rgb_buf, width);
+  } else {
+  }
+}
+
+void ConvertYUVtoRGB24(const uint8* y_buf,

[Alpha Left Google, 2011/08/22 14:16:59]

Call this ConvertYUVtoRGB24_SSE2.

+                       const uint8* u_buf,
+                       const uint8* v_buf,
+                       uint8* rgb_buf,
+                       int width,
+                       int height,
+                       int y_pitch,
+                       int uv_pitch,
+                       int rgb_pitch,
+                       YUVType yuv_type) {
+  if (yuv_type == YV12) {

[Alpha Left Google, 2011/08/22 14:16:59]

Please this use construct:

if (yuv_type != YV12)
  NOTIMPLMENTED();

...
to save an extra scope.

+    for (; height >= 2; height -= 2) {
+      ConvertYUVtoRGBRow(y_buf, u_buf, v_buf, rgb_buf, width);
+      rgb_buf += rgb_pitch;
+      y_buf += y_pitch;
+
+      ConvertYUVtoRGBRow(y_buf, u_buf, v_buf, rgb_buf, width);
+      rgb_buf += rgb_pitch;
+      y_buf += y_pitch;
+
+      u_buf += uv_pitch;
+      v_buf += uv_pitch;
+    }
+
+    if (height)
+      ConvertYUVtoRGBRow(y_buf, u_buf, v_buf, rgb_buf, width);
+  } else {
+  }
+}
+
+}  // namespace simd
+
+}  // namespace media