| // Copyright 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CC_LAYERS_CONTENTS_SCALING_LAYER_H_ |
| #define CC_LAYERS_CONTENTS_SCALING_LAYER_H_ |
| |
| #include "cc/base/cc_export.h" |
| #include "cc/layers/layer.h" |
| |
| namespace cc { |
| |
| // Base class for layers that need contents scale. |
| // The content bounds are determined by bounds and scale of the contents. |
| class CC_EXPORT ContentsScalingLayer : public Layer { |
| public: |
| void CalculateContentsScale(float ideal_contents_scale, |
| float* contents_scale_x, |
| float* contents_scale_y, |
| gfx::Size* content_bounds) override; |
| |
| bool Update(ResourceUpdateQueue* queue, |
| const OcclusionTracker<Layer>* occlusion) override; |
| |
| protected: |
| ContentsScalingLayer(); |
| ~ContentsScalingLayer() override; |
| |
| gfx::Size ComputeContentBoundsForScale(float scale_x, float scale_y) const; |
| |
| private: |
| float last_update_contents_scale_x_; |
| float last_update_contents_scale_y_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ContentsScalingLayer); |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_LAYERS_CONTENTS_SCALING_LAYER_H__ |