cc/layers/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_LAYERS_NINE_PATCH_LAYER_H_
   6 #define CC_LAYERS_NINE_PATCH_LAYER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "cc/base/cc_export.h"
  10 #include "cc/layers/layer.h"
  11 #include "cc/layers/ui_resource_layer.h"
  12 #include "cc/resources/ui_resource_client.h"
  13 #include "ui/gfx/geometry/rect.h"
  14
  15 namespace cc {
  16
  17 class LayerTreeHost;
  18 class ScopedUIResource;
  19
  20 class CC_EXPORT NinePatchLayer : public UIResourceLayer {
  21  public:
  22   static scoped_refptr<NinePatchLayer> Create(const LayerSettings& settings);
  23
  24   void PushPropertiesTo(LayerImpl* layer) override;
  25
  26   // |border| is the space around the center rectangular region in layer space
  27   // (known as aperture in image space).  |border.x()| and |border.y()| are the
  28   // size of the left and top boundary, respectively.
  29   // |border.width()-border.x()| and |border.height()-border.y()| are the size
  30   // of the right and bottom boundary, respectively.
  31   void SetBorder(const gfx::Rect& border);
  32
  33   // aperture is in the pixel space of the bitmap resource and refers to
  34   // the center patch of the ninepatch (which is unused in this
  35   // implementation). We split off eight rects surrounding it and stick them
  36   // on the edges of the layer. The corners are unscaled, the top and bottom
  37   // rects are x-stretched to fit, and the left and right rects are
  38   // y-stretched to fit.
  39   void SetAperture(const gfx::Rect& aperture);
  40   void SetFillCenter(bool fill_center);
  41
  42  private:
  43   explicit NinePatchLayer(const LayerSettings& settings);
  44   ~NinePatchLayer() override;
  45   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
  46
  47   gfx::Rect border_;
  48   bool fill_center_;
  49
  50   // The transparent center region that shows the parent layer's contents in
  51   // image space.
  52   gfx::Rect image_aperture_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(NinePatchLayer);
  55 };
  56
  57 }  // namespace cc
  58
  59 #endif  // CC_LAYERS_NINE_PATCH_LAYER_H_