cc/blink/web_layer_impl_fixed_bounds.h

   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 CC_BLINK_WEB_LAYER_IMPL_FIXED_BOUNDS_H_
   6 #define CC_BLINK_WEB_LAYER_IMPL_FIXED_BOUNDS_H_
   7
   8 #include "cc/blink/web_layer_impl.h"
   9 #include "ui/gfx/geometry/size.h"
  10 #include "ui/gfx/transform.h"
  11
  12 namespace cc_blink {
  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   CC_BLINK_EXPORT WebLayerImplFixedBounds();
  22   CC_BLINK_EXPORT explicit WebLayerImplFixedBounds(
  23       scoped_refptr<cc::Layer> layer);
  24   virtual ~WebLayerImplFixedBounds();
  25
  26   // WebLayerImpl overrides.
  27   void invalidateRect(const blink::WebRect& rect) override;
  28   void setTransformOrigin(
  29       const blink::WebFloatPoint3D& transform_origin) override;
  30   void setBounds(const blink::WebSize& bounds) override;
  31   blink::WebSize bounds() const override;
  32   void setTransform(const SkMatrix44& transform) override;
  33   SkMatrix44 transform() const override;
  34
  35   CC_BLINK_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 cc_blink
  50
  51 #endif  // CC_BLINK_WEB_LAYER_IMPL_FIXED_BOUNDS_H_