Introducing a helper wrapper for YUV-to-RGB convertion and/or scaling.

remoting/base/util.h

Index: remoting/base/util.h
diff --git a/remoting/base/util.h b/remoting/base/util.h
index c05ef2f99f9b24e262259ea7755ad063adcc9870..c4621cc0a3661ac1fc4a2e0eb532b29fa427c359 100644
--- a/remoting/base/util.h
+++ b/remoting/base/util.h
@@ -18,16 +18,33 @@ std::string GetTimestampString();
 // TODO(sergeyu): Move these methods to media.
 int GetBytesPerPixel(media::VideoFrame::Format format);
 
-// Convert YUV to RGB32 on a specific rectangle.
-void ConvertYUVToRGB32WithRect(const uint8* y_plane,
-                               const uint8* u_plane,
-                               const uint8* v_plane,
-                               uint8* rgb_plane,
-                               const SkIRect& rect,
-                               int y_stride,
-                               int uv_stride,
-                               int rgb_stride);
+// Convert and scale YUV to RGB32 on a specific rectangle. The source and
+// destination buffers are assumed to contain only |source_buffer_rect| and
+// |dest_buffer_rect| areas correspondingly. The scaling factor is determined
+// as ratio between |dest_size| and |source_size|. The target rectangle
+// |dect_rect| is specified in the destination coordinates.
+//
+// |source_buffer_rect| and |dest_buffer_rect| must fall entirely within
+// the source and destination dimensions, respectively. |dest_rect| must be
+// completely contained within the source and destinations buffers boundaries
+// including the case when scaling is requested.
+//
+// N.B. The top left corner coordinates of YUV buffer should have even X and Y
+// coordinates.
+void ConvertAndScaleYUVToRGB32Rect(const uint8* source_yplane,
+                                   const uint8* source_uplane,
+                                   const uint8* source_vplane,
+                                   int source_ystride,
+                                   int source_uvstride,
+                                   const SkISize& source_size,
+                                   const SkIRect& source_buffer_rect,
+                                   uint8* dest_buffer,
+                                   int dest_stride,
+                                   const SkISize& dest_size,
+                                   const SkIRect& dest_buffer_rect,
+                                   const SkIRect& dest_rect);
 
+// Convert RGB32 to YUV on a specific rectangle.
 void ConvertRGB32ToYUVWithRect(const uint8* rgb_plane,
                                uint8* y_plane,
                                uint8* u_plane,
@@ -60,6 +77,14 @@ void CopyRect(const uint8* src_plane,
               int bytes_per_pixel,
               const SkIRect& rect);
 
+void CopyRGB32Rect(const uint8* source_buffer,
+                   int source_stride,
+                   const SkIRect& source_buffer_rect,
+                   uint8* dest_buffer,
+                   int dest_stride,
+                   const SkIRect& dest_buffer_rect,
+                   const SkIRect& dest_rect);
+
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_UTIL_H_