WebGL: GL_RGB emulation for IOSurface backed textures. [For reference only]

ui/gl/gl_image.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 UI_GL_GL_IMAGE_H_
 #define UI_GL_GL_IMAGE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 56 matching lines @@
                                     gfx::OverlayTransform transform,
                                     const gfx::Rect& bounds_rect,
                                     const gfx::RectF& crop_rect) = 0;
 
   // Dumps information about the memory backing the GLImage to a dump named
   // |dump_name|.
   virtual void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd,
                             uint64_t process_tracing_id,
                             const std::string& dump_name) = 0;
 
+  // Whether the image is emulating an (GL_RGB or GL_BGR) internal format with
+  // (GL_RGBA or GL_BGRA).
+  virtual bool EmulatingRGB() const = 0;
+
  protected:
   virtual ~GLImage() {}
 
  private:
   friend class base::RefCounted<GLImage>;
 
   DISALLOW_COPY_AND_ASSIGN(GLImage);
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_IMAGE_H_