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_ 55