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// 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:
virtual void CalculateContentsScale(float ideal_contents_scale,
float* contents_scale_x,
float* contents_scale_y,
gfx::Size* content_bounds) OVERRIDE;
virtual bool Update(ResourceUpdateQueue* queue,
const OcclusionTracker<Layer>* occlusion) OVERRIDE;
protected:
ContentsScalingLayer();
virtual ~ContentsScalingLayer();
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__
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