gpu: Make glTexSubImage2D work with GL_SRGB_ALPHA on OpenGL

gpu/command_buffer/service/texture_manager.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_TEXTURE_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 
 #include <algorithm>
 #include <list>
 #include <set>
@@ skipping 850 matching lines @@
     // Presumes the pointer is valid.
     TextureRef** texture_ref);
 
   void ValidateAndDoTexImage(
     DecoderTextureState* texture_state,
     ContextState* state,
     DecoderFramebufferState* framebuffer_state,
     const char* function_name,
     const DoTexImageArguments& args);
 
+  struct DoTexSubImageArguments {
+    GLenum target;
+    GLint level;
+    GLint xoffset;
+    GLint yoffset;
+    GLsizei width;
+    GLsizei height;
+    GLenum format;
+    GLenum type;
+    const void* pixels;
+    uint32 pixels_size;
+    // TODO(kkinnunen): currently this is used only for TexSubImage2D.
+  };
+
+  bool ValidateTexSubImage(
+      ContextState* state,
+      const char* function_name,
+      const DoTexSubImageArguments& args,
+      // Pointer to TextureRef filled in if validation successful.
+      // Presumes the pointer is valid.
+      TextureRef** texture_ref);
+
+  void ValidateAndDoTexSubImage(GLES2Decoder* decoder,
+                                DecoderTextureState* texture_state,
+                                ContextState* state,
+                                DecoderFramebufferState* framebuffer_state,
+                                const char* function_name,
+                                const DoTexSubImageArguments& args);
+
   // TODO(kloveless): Make GetTexture* private once this is no longer called
   // from gles2_cmd_decoder.
   TextureRef* GetTextureInfoForTarget(ContextState* state, GLenum target);
   TextureRef* GetTextureInfoForTargetUnlessDefault(
       ContextState* state, GLenum target);
 
   // Note that internal_format is only checked in relation to the format
   // parameter, so that this function may be used to validate texSubImage2D.
   bool ValidateTextureParameters(
     ErrorState* error_state, const char* function_name,
     GLenum format, GLenum type, GLenum internal_format, GLint level);
 
   // base::trace_event::MemoryDumpProvider implementation.
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                     base::trace_event::ProcessMemoryDump* pmd) override;
 
+  // Returns the union of |rect1| and |rect2| if one of the rectangles is empty,
+  // contains the other rectangle or shares an edge with the other rectangle.
+  // Part of the public interface because texture pixel data rectangle
+  // operations are also implemented in decoder at the moment.
+  static bool CombineAdjacentRects(const gfx::Rect& rect1,
+                                   const gfx::Rect& rect2,
+                                   gfx::Rect* result);
+
  private:
   friend class Texture;
   friend class TextureRef;
 
   // Helper for Initialize().
   scoped_refptr<TextureRef> CreateDefaultAndBlackTextures(
       GLenum target,
       GLuint* black_texture);
 
   void DoTexImage(
@@ skipping 75 matching lines @@
  private:
   DecoderTextureState* texture_state_;
   base::TimeTicks begin_time_;
   DISALLOW_COPY_AND_ASSIGN(ScopedTextureUploadTimer);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_