Loading/Creating images for mutiple scale factors on the fly

ui/gfx/image/image_skia_rep.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_GFX_IMAGE_IMAGE_SKIA_REP_H_
 #define UI_GFX_IMAGE_IMAGE_SKIA_REP_H_
 #pragma once
 
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/layout.h"
 #include "ui/base/ui_export.h"
 
 namespace gfx {
+class Size;
 
 // An ImageSkiaRep represents a bitmap and the scale factor it is intended for.
 class UI_EXPORT ImageSkiaRep {
  public:
   // Create null bitmap.
   ImageSkiaRep();
   ~ImageSkiaRep();
 
-  // Creates a bitmap with kARGB_8888_Config config with given DIP |width| and
-  // |height| and |scale_factor|.
-  // Allocates pixels.
-  ImageSkiaRep(int width, int height, ui::ScaleFactor scale_factor);
+  // Creates a bitmap with kARGB_8888_Config config with given |size| in DIP.
+  // This allocates pixels in the bitmap.
+  ImageSkiaRep(const gfx::Size& size, ui::ScaleFactor scale_factor);
 
   // Creates a bitmap with a default scale factor of 1x.
   // Adds ref to |src|.
   // TODO(pkotwicz): This is temporary and should be removed ASAP.
   ImageSkiaRep(const SkBitmap& src);
 
   // Creates a bitmap with given scale factor.
   // Adds ref to |src|.
   ImageSkiaRep(const SkBitmap& src, ui::ScaleFactor scale_factor);
 
@@ skipping 21 matching lines @@
   const SkBitmap& sk_bitmap() const { return bitmap_; }
 
  private:
   SkBitmap bitmap_;
   ui::ScaleFactor scale_factor_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_SKIA_REP_H_