gpu: Optimize and cleanup code used for CHROMIUM_copy_texture.

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 <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 12 matching lines @@
 // via a blit to a framebuffer object.
 class GPU_EXPORT CopyTextureCHROMIUMResourceManager {
  public:
   CopyTextureCHROMIUMResourceManager();
   ~CopyTextureCHROMIUMResourceManager();
 
   void Initialize(const gles2::GLES2Decoder* decoder);
   void Destroy();
 
   void DoCopyTexture(const gles2::GLES2Decoder* decoder, GLenum source_target,
-                     GLenum dest_target, GLuint source_id, GLuint dest_id,
-                     GLint level, GLsizei width, GLsizei height,
+                     GLuint source_id, GLuint dest_id, GLint level,
+                     GLenum internal_format, 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,
+                                  GLenum source_target, GLuint source_id,
+                                  GLuint dest_id, GLint level,
+                                  GLenum internal_format,
                                   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:
+  void DoFastCopyTexture(const gles2::GLES2Decoder* decoder,
+                         GLuint source_id,
+                         GLuint dest_id,
+                         GLint level,
+                         GLenum internal_format,
+                         GLsizei width,
+                         GLsizei height);
+  bool BindFramebufferTexture2D(GLuint texture_id, GLint level);
+
   struct ProgramInfo {
     ProgramInfo()
         : program(0u),
           matrix_handle(0u),
           half_size_handle(0u),
           sampler_handle(0u) {}
 
     GLuint program;
     GLuint matrix_handle;
     GLuint half_size_handle;
     GLuint sampler_handle;
   };
 
   bool initialized_;
   typedef std::vector<GLuint> ShaderVector;
   ShaderVector vertex_shaders_;
   ShaderVector fragment_shaders_;
   typedef std::pair<int, int> ProgramMapKey;
   typedef base::hash_map<ProgramMapKey, ProgramInfo> ProgramMap;
   ProgramMap programs_;
   GLuint buffer_id_;
   GLuint framebuffer_;
 
   DISALLOW_COPY_AND_ASSIGN(CopyTextureCHROMIUMResourceManager);
 };
 
 }  // namespace gpu.
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_