1 // Copyright 2014 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 CONTENT_RENDERER_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_FIXED_BOUNDS_H_ 6 #define CONTENT_RENDERER_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_FIXED_BOUNDS_H_ 7 8 #include "content/renderer/compositor_bindings/web_layer_impl.h" 9 #include "ui/gfx/size.h" 10 #include "ui/gfx/transform.h" 11 12 namespace content { 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 CONTENT_EXPORT WebLayerImplFixedBounds(); 22 CONTENT_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 setTransformOrigin( 29 const blink::WebFloatPoint3D& transform_origin); 30 virtual void setBounds(const blink::WebSize& bounds); 31 virtual blink::WebSize bounds() const; 32 virtual void setTransform(const SkMatrix44& transform); 33 virtual SkMatrix44 transform() const; 34 35 CONTENT_EXPORT void SetFixedBounds(gfx::Size bounds); 36 37 protected: 38 void SetTransformInternal(const gfx::Transform& transform); 39 void UpdateLayerBoundsAndTransform(); 40 41 gfx::Transform original_transform_; 42 gfx::Size original_bounds_; 43 gfx::Size fixed_bounds_; 44 45 private: 46 DISALLOW_COPY_AND_ASSIGN(WebLayerImplFixedBounds); 47 }; 48 49 } // namespace content 50 51 #endif // CONTENT_RENDERER_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_FIXED_BOUNDS_H_ 52 53
