web_layer_impl_fixed_bounds.h revision 90dce4d38c5ff5333bea97d859d4e484e27edf0c 
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
12namespace 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.
19class 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 WebKit::WebFloatRect& rect);
28  virtual void setAnchorPoint(const WebKit::WebFloatPoint& anchor_point);
29  virtual void setBounds(const WebKit::WebSize& bounds);
30  virtual WebKit::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