Enable 2D Canvas painting for Chrome on Android.

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.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 GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_
 
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
 namespace gles2 {
 
 class GLES2Decoder;
 
 }  // namespace gles2.
 
 // This class encapsulates the resources required to implement the
 // GL_CHROMIUM_copy_texture extension.  The copy operation is performed
 // via a blit to a framebuffer object.
 class GPU_EXPORT CopyTextureCHROMIUMResourceManager {
  public:
   CopyTextureCHROMIUMResourceManager() : initialized_(false) {}
 
   void Initialize(const gles2::GLES2Decoder* decoder);
   void Destroy();
 
   void DoCopyTexture(const gles2::GLES2Decoder* decoder, GLenum source_target,

[scherkus (not reviewing), 2013/04/10 00:05:08]

there only appear to be two callers:
https://code.google.com/p/chromium/codesearch#search/&q=%5C-%5C%3EDoCopyTextu...

do we really need to add a second variant of the API?

[hkuang1, 2013/04/10 01:32:35]

Yes. On Android, the video frames are emitted as streamtexture and there is a
transform matrix associated with it. So we should apply the transform matrix on
the texture for further usage. Also, this class's api is not for external usage.
It is only used inside the GPU process and by the DoCopyTexture extension. So
looks ok.

                      GLenum dest_target, GLuint source_id, GLuint dest_id,
                      GLint level, GLsizei width, GLsizei height,
                      bool flip_y, bool premultiply_alpha,
                      bool unpremultiply_alpha);
 
+  // This will apply a transform on the source texture before copying to
+  // destination texture.
+  void DoCopyTextureWithTransform(const gles2::GLES2Decoder* decoder,
+                                  GLenum source_target, GLenum dest_target,
+                                  GLuint source_id, GLuint dest_id, GLint level,
+                                  GLsizei width, GLsizei height, bool flip_y,
+                                  bool premultiply_alpha,
+                                  bool unpremultiply_alpha,
+                                  const GLfloat transform_matrix[16]);
+
   // The attributes used during invocation of the extension.
   static const GLuint kVertexPositionAttrib = 0;
 
  private:
   bool initialized_;
 
   static const int kNumPrograms = 12;
   GLuint programs_[kNumPrograms];
   GLuint buffer_id_;
   GLuint framebuffer_;
+  GLuint matrix_handle_[kNumPrograms];
   GLuint sampler_locations_[kNumPrograms];
 
   DISALLOW_COPY_AND_ASSIGN(CopyTextureCHROMIUMResourceManager);
 };
 
 }  // namespace gpu.
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_