cc/layers/nine_patch_layer_impl.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_LAYERS_NINE_PATCH_LAYER_IMPL_H_
   6 #define CC_LAYERS_NINE_PATCH_LAYER_IMPL_H_
   7
   8 #include <string>
   9
  10 #include "cc/base/cc_export.h"
  11 #include "cc/layers/layer_impl.h"
  12 #include "cc/layers/ui_resource_layer_impl.h"
  13 #include "cc/resources/resource_provider.h"
  14 #include "cc/resources/ui_resource_client.h"
  15 #include "ui/gfx/rect.h"
  16 #include "ui/gfx/size.h"
  17
  18 namespace base {
  19 class DictionaryValue;
  20 }
  21
  22 namespace cc {
  23
  24 class CC_EXPORT NinePatchLayerImpl : public UIResourceLayerImpl {
  25  public:
  26   static scoped_ptr<NinePatchLayerImpl> Create(LayerTreeImpl* tree_impl,
  27                                                int id) {
  28     return make_scoped_ptr(new NinePatchLayerImpl(tree_impl, id));
  29   }
  30   virtual ~NinePatchLayerImpl();
  31
  32   // The bitmap stretches out the bounds of the layer.  The following picture
  33   // illustrates the parameters associated with the dimensions.
  34   //
  35   // Layer space layout              Bitmap space layout
  36   //
  37   // ------------------------       ~~~~~~~~~~ W ~~~~~~~~~~
  38   // |          :           |       :     :                |
  39   // |          C           |       :     Y                |
  40   // |          :           |       :     :                |
  41   // |     ------------     |       :~~X~~------------     |
  42   // |     |          |     |       :     |          :     |
  43   // |     |          |     |       :     |          :     |
  44   // |~~A~~|          |~~B~~|       H     |          Q     |
  45   // |     |          |     |       :     |          :     |
  46   // |     ------------     |       :     ~~~~~P~~~~~      |
  47   // |          :           |       :                      |
  48   // |          D           |       :                      |
  49   // |          :           |       :                      |
  50   // ------------------------       ------------------------
  51   //
  52   // |image_bounds| = (W, H)
  53   // |image_aperture| = (X, Y, P, Q)
  54   // |border| = (A, C, A + B, C + D)
  55   // |fill_center| indicates whether to draw the center quad or not.
  56   void SetLayout(const gfx::Rect& image_aperture,
  57                  const gfx::Rect& border,
  58                  bool fill_center);
  59
  60   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
  61       OVERRIDE;
  62   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
  63
  64   virtual void AppendQuads(QuadSink* quad_sink,
  65                            AppendQuadsData* append_quads_data) OVERRIDE;
  66
  67   virtual base::DictionaryValue* LayerTreeAsJson() const OVERRIDE;
  68
  69  protected:
  70   NinePatchLayerImpl(LayerTreeImpl* tree_impl, int id);
  71
  72  private:
  73   virtual const char* LayerTypeAsString() const OVERRIDE;
  74
  75   void CheckGeometryLimitations();
  76
  77   // The transparent center region that shows the parent layer's contents in
  78   // image space.
  79   gfx::Rect image_aperture_;
  80
  81   // An inset border that the patches will be mapped to.
  82   gfx::Rect border_;
  83
  84   bool fill_center_;
  85
  86   DISALLOW_COPY_AND_ASSIGN(NinePatchLayerImpl);
  87 };
  88
  89 }  // namespace cc
  90
  91 #endif  // CC_LAYERS_NINE_PATCH_LAYER_IMPL_H_