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      1 // Copyright 2011 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_RESOURCES_CONTENT_LAYER_UPDATER_H_
      6 #define CC_RESOURCES_CONTENT_LAYER_UPDATER_H_
      7 
      8 #include "cc/base/cc_export.h"
      9 #include "cc/resources/layer_updater.h"
     10 #include "ui/gfx/rect.h"
     11 
     12 class SkCanvas;
     13 
     14 namespace cc {
     15 
     16 class LayerPainter;
     17 class RenderingStatsInstrumentation;
     18 
     19 // Base class for BitmapContentLayerUpdater and
     20 // SkPictureContentLayerUpdater that reduces code duplication between
     21 // their respective PaintContents implementations.
     22 class CC_EXPORT ContentLayerUpdater : public LayerUpdater {
     23  public:
     24   void set_rendering_stats_instrumentation(RenderingStatsInstrumentation* rsi);
     25   virtual void SetOpaque(bool opaque) OVERRIDE;
     26   virtual void SetFillsBoundsCompletely(bool fills_bounds) OVERRIDE;
     27   virtual void SetBackgroundColor(SkColor background_color) OVERRIDE;
     28 
     29  protected:
     30   ContentLayerUpdater(scoped_ptr<LayerPainter> painter,
     31                       RenderingStatsInstrumentation* stats_instrumentation,
     32                       int layer_id);
     33   virtual ~ContentLayerUpdater();
     34 
     35   // Paints the contents. |content_size| size of the underlying layer in
     36   // layer's content space. |paint_rect| bounds to paint in content space of the
     37   // layer. Both |content_size| and |paint_rect| are in pixels.
     38   void PaintContents(SkCanvas* canvas,
     39                      const gfx::Size& layer_content_size,
     40                      const gfx::Rect& paint_rect,
     41                      float contents_width_scale,
     42                      float contents_height_scale);
     43   gfx::Rect paint_rect() const { return paint_rect_; }
     44 
     45   bool layer_is_opaque() const { return layer_is_opaque_; }
     46   bool layer_fills_bounds_completely() const {
     47     return layer_fills_bounds_completely_;
     48   }
     49 
     50   SkColor background_color() const { return background_color_; }
     51 
     52   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
     53   int layer_id_;
     54 
     55   // True when it is known that all output pixels will be opaque.
     56   bool layer_is_opaque_;
     57   // True when it is known that all output pixels will be filled.
     58   bool layer_fills_bounds_completely_;
     59 
     60  private:
     61   gfx::Rect paint_rect_;
     62   scoped_ptr<LayerPainter> painter_;
     63   SkColor background_color_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(ContentLayerUpdater);
     66 };
     67 
     68 }  // namespace cc
     69 
     70 #endif  // CC_RESOURCES_CONTENT_LAYER_UPDATER_H_
     71