cc/nine_patch_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_NINE_PATCH_LAYER_H_
   6 #define CC_NINE_PATCH_LAYER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "cc/cc_export.h"
  10 #include "cc/layer.h"
  11 #include "cc/image_layer_updater.h"
  12 #include "ui/gfx/rect.h"
  13 #include "third_party/skia/include/core/SkBitmap.h"
  14
  15 namespace cc {
  16
  17 class ResourceUpdateQueue;
  18
  19 class CC_EXPORT NinePatchLayer : public Layer {
  20 public:
  21     static scoped_refptr<NinePatchLayer> create();
  22
  23     virtual bool drawsContent() const OVERRIDE;
  24     virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
  25     virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
  26     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
  27
  28     // aperture is in the pixel space of the bitmap resource and refers to
  29     // the center patch of the ninepatch (which is unused in this
  30     // implementation). We split off eight rects surrounding it and stick them
  31     // on the edges of the layer. The corners are unscaled, the top and bottom
  32     // rects are x-stretched to fit, and the left and right rects are
  33     // y-stretched to fit.
  34     void setBitmap(const SkBitmap& bitmap, const gfx::Rect& aperture);
  35
  36 private:
  37     NinePatchLayer();
  38     virtual ~NinePatchLayer();
  39     virtual scoped_ptr<LayerImpl> createLayerImpl(LayerTreeHostImpl* hostImpl) OVERRIDE;
  40
  41     void createUpdaterIfNeeded();
  42     void createResource();
  43
  44     scoped_refptr<ImageLayerUpdater> m_updater;
  45     scoped_ptr<LayerUpdater::Resource> m_resource;
  46
  47     SkBitmap m_bitmap;
  48     bool m_bitmapDirty;
  49
  50     // The transparent center region that shows the parent layer's contents in image space.
  51     gfx::Rect m_imageAperture;
  52 };
  53
  54 }  // namespace cc
  55
  56 #endif  // CC_NINE_PATCH_LAYER_H_