Allow the Chromoting client plugin to support up-scaling, albeit slowly.

remoting/base/util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_BASE_UTIL_H_
 #define REMOTING_BASE_UTIL_H_
 
 #include <string>
 
 #include "media/base/video_frame.h"
 #include "third_party/skia/include/core/SkRect.h"
 
 namespace remoting {
 
 // Return a string that contains the current date formatted as 'MMDD/HHMMSS:'.
 std::string GetTimestampString();
 
+// Calculate the offset of a specific pixel in an RGB32 buffer.
+int CalculateRGBOffset(int x, int y, int stride);
+
+// Calculate the offset of a specific pixel in a YV12/YUV420 buffer. Note that
+// the X and Y coordinates must both be even owing to the YV12 buffer layout.
+int CalculateYOffset(int x, int y, int stride);
+int CalculateUVOffset(int x, int y, int 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.
@@ skipping 56 matching lines @@
 
 // Replaces every occurrence of "\n" in a string by "\r\n".
 std::string ReplaceLfByCrLf(const std::string& in);
 
 // Replaces every occurrence of "\r\n" in a string by "\n".
 std::string ReplaceCrLfByLf(const std::string& in);
 
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_UTIL_H_