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__ 45
