cc/layers/contents_scaling_layer.h

   1 // Copyright 2012 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_LAYERS_CONTENTS_SCALING_LAYER_H_
   6 #define CC_LAYERS_CONTENTS_SCALING_LAYER_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/layers/layer.h"
  10
  11 namespace cc {
  12
  13 // Base class for layers that need contents scale.
  14 // The content bounds are determined by bounds and scale of the contents.
  15 class CC_EXPORT ContentsScalingLayer : public Layer {
  16  public:
  17   virtual void CalculateContentsScale(float ideal_contents_scale,
  18                                       float device_scale_factor,
  19                                       float page_scale_factor,
  20                                       float maximum_animation_contents_scale,
  21                                       bool animating_transform_to_screen,
  22                                       float* contents_scale_x,
  23                                       float* contents_scale_y,
  24                                       gfx::Size* content_bounds) OVERRIDE;
  25
  26   virtual bool Update(ResourceUpdateQueue* queue,
  27                       const OcclusionTracker<Layer>* occlusion) OVERRIDE;
  28
  29  protected:
  30   ContentsScalingLayer();
  31   virtual ~ContentsScalingLayer();
  32
  33   gfx::Size ComputeContentBoundsForScale(float scale_x, float scale_y) const;
  34
  35  private:
  36   float last_update_contents_scale_x_;
  37   float last_update_contents_scale_y_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(ContentsScalingLayer);
  40 };
  41
  42 }  // namespace cc
  43
  44 #endif  // CC_LAYERS_CONTENTS_SCALING_LAYER_H__