Vend common GL context

ui/gfx/compositor/compositor.h

 // Copyright (c) 2011 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_GFX_COMPOSITOR_COMPOSITOR_H_
 #define UI_GFX_COMPOSITOR_COMPOSITOR_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/compositor/compositor_export.h"
 #include "ui/gfx/transform.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/size.h"
 
 class SkCanvas;
 namespace gfx {
 class Point;
 class Rect;
-class Size;
 }
 
 namespace ui {
 
 struct TextureDrawParams {
-  TextureDrawParams() : transform(), blend(false) {}
+  TextureDrawParams() : transform(), blend(false), compositor_size() {}
 
   // The transform to be applied to the texture.
   ui::Transform transform;
 
   // If this is true, then the texture is blended with the pixels behind it.
   // Otherwise, the drawn pixels clobber the old pixels.
   bool blend;
 
+  // The size of the surface that the texture is drawn to.
+  gfx::Size compositor_size;
+
   // Copy and assignment are allowed.
 };
 
 // Textures are created by a Compositor for managing an accelerated view.
 // Any time a View with a texture needs to redraw itself it invokes SetCanvas().
 // When the view is ready to be drawn Draw() is invoked.
 //
 // Texture is really a proxy to the gpu. Texture does not itself keep a copy of
 // the bitmap.
 //
@@ skipping 41 matching lines @@
   virtual void NotifyEnd() = 0;
 
   // Blurs the specific region in the compositor.
   virtual void Blur(const gfx::Rect& bounds) = 0;
 
   // Schedules a paint on the widget this Compositor was created for.
   virtual void SchedulePaint() = 0;
 
   // Notifies the compositor that the size of the widget that it is
   // drawing to has changed.
-  virtual void OnWidgetSizeChanged(const gfx::Size& size) = 0;
+  void WidgetSizeChanged(const gfx::Size& size) {
+    size_ = size;
+    OnWidgetSizeChanged();
+  }
+
+  // Returns the size of the widget that is being drawn to.
+  const gfx::Size& size() { return size_; }
 
  protected:
+  explicit Compositor(const gfx::Size& size) : size_(size) {}
   virtual ~Compositor() {}
 
+  virtual void OnWidgetSizeChanged() = 0;
+
  private:
+  gfx::Size size_;
+
   friend class base::RefCounted<Compositor>;
 };
 
 }  // namespace ui
 
 #endif  // UI_GFX_COMPOSITOR_COMPOSITOR_H_