webkit/renderer/compositor_bindings/web_layer_impl_fixed_bounds.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_FIXED_BOUNDS_H_
   6 #define WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_FIXED_BOUNDS_H_
   7
   8 #include "ui/gfx/size.h"
   9 #include "ui/gfx/transform.h"
  10 #include "webkit/renderer/compositor_bindings/web_layer_impl.h"
  11
  12 namespace webkit {
  13
  14 // A special implementation of WebLayerImpl for layers that its contents
  15 // need to be automatically scaled when the bounds changes. The compositor
  16 // can efficiently handle the bounds change of such layers if the bounds
  17 // is fixed to a given value and the change of bounds are converted to
  18 // transformation scales.
  19 class WebLayerImplFixedBounds : public WebLayerImpl {
  20  public:
  21   WEBKIT_COMPOSITOR_BINDINGS_EXPORT WebLayerImplFixedBounds();
  22   WEBKIT_COMPOSITOR_BINDINGS_EXPORT explicit WebLayerImplFixedBounds(
  23       scoped_refptr<cc::Layer>);
  24   virtual ~WebLayerImplFixedBounds();
  25
  26   // WebLayerImpl overrides.
  27   virtual void invalidateRect(const blink::WebFloatRect& rect);
  28   virtual void setAnchorPoint(const blink::WebFloatPoint& anchor_point);
  29   virtual void setBounds(const blink::WebSize& bounds);
  30   virtual blink::WebSize bounds() const;
  31   virtual void setSublayerTransform(const SkMatrix44& transform);
  32   virtual SkMatrix44 sublayerTransform() const;
  33   virtual void setTransform(const SkMatrix44& transform);
  34   virtual SkMatrix44 transform() const;
  35
  36   WEBKIT_COMPOSITOR_BINDINGS_EXPORT void SetFixedBounds(gfx::Size bounds);
  37
  38  protected:
  39   void SetTransformInternal(const gfx::Transform& transform);
  40   void SetSublayerTransformInternal(const gfx::Transform& transform);
  41   void UpdateLayerBoundsAndTransform();
  42
  43   gfx::Transform original_sublayer_transform_;
  44   gfx::Transform original_transform_;
  45   gfx::Size original_bounds_;
  46   gfx::Size fixed_bounds_;
  47
  48  private:
  49   DISALLOW_COPY_AND_ASSIGN(WebLayerImplFixedBounds);
  50 };
  51
  52 }  // namespace webkit
  53
  54 #endif  // WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_FIXED_BOUNDS_H_