Update the nine patch layer to use UI resources

cc/layers/nine_patch_layer.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYERS_NINE_PATCH_LAYER_H_
 #define CC_LAYERS_NINE_PATCH_LAYER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
-#include "cc/resources/image_layer_updater.h"
-#include "third_party/skia/include/core/SkBitmap.h"
+#include "cc/resources/ui_resource_client.h"
 #include "ui/gfx/rect.h"
 
 namespace cc {
 
-class ResourceUpdateQueue;
+class LayerTreeHost;
+class ScopedUIResource;
 
 class CC_EXPORT NinePatchLayer : public Layer {
  public:
   static scoped_refptr<NinePatchLayer> Create();
 
   virtual bool DrawsContent() const OVERRIDE;
-  virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
-      OVERRIDE;
-  virtual bool Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker* occlusion) OVERRIDE;
+
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
 
+  virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
+
+  // The |border| is the space around the center rectangular region in layer
+  // space (known as aperture in image space).  |border.x()| and |border.y()|
+  // are the size of the left and top boundary, respectively.
+  // |border.width()-border.x()| and |border.height()-border.y()| are the size
+  // of the right and bottom boundary, respectively.
+  void SetBorder(gfx::Rect border);
+
   // aperture is in the pixel space of the bitmap resource and refers to
   // the center patch of the ninepatch (which is unused in this
   // implementation). We split off eight rects surrounding it and stick them
   // on the edges of the layer. The corners are unscaled, the top and bottom
   // rects are x-stretched to fit, and the left and right rects are
   // y-stretched to fit.
-  void SetBitmap(const SkBitmap& bitmap, gfx::Rect aperture);
+  void SetBitmap(const SkBitmap& skbitmap, gfx::Rect aperture);
+
+  // An alternative way of setting bitmap to allow for sharing of resources.
+  void SetUIResourceId(UIResourceId resource_id,
+                       gfx::Rect aperture,
+                       bool fill_center);

[aelias_OOO_until_Jul13, 2013/08/30 06:20:41]

Put this in a separate call SetFillCenter(bool); so it can be used with
SetBitmap as well (without needing to edit the Blink API for an existing
function which I understand is annoying to do).

[powei, 2013/09/03 23:36:05]

Done.

+
+  class UIResourceHolder {
+   public:
+    virtual UIResourceId id() = 0;

[aelias_OOO_until_Jul13, 2013/08/30 18:09:54]

Thinking about it further I think you're on to something with this and we should
make it public to avoid every layer type needing to reimplement this themselves.

How about this: get rid of ScopedUIResource and have this instead:

class UIResource : public base::RefCounted<UIResource> {
  public:
    virtual UIResourceId id() = 0;
    virtual ~UIResource();
};

class ManagedUIResource : public UIResource {
  // basically same implementation as ScopedUIResource
};

class UnmanagedUIResource : public UIResource {
  // just holds an ID
};

Then NinePatchLayer would just have void SetUIResource(scoped_refptr<UIResource>
uiresource, gfx::Rect, bool);  .  And change the webkit/compositor_bindings
NinePatchLayer shim to call that instead of SetBitmap.

[aelias_OOO_until_Jul13, 2013/08/30 19:02:40]

Powei pointed out offline that this has problems with LayerTreeHost changes, so
let's not do this yet.

[powei, 2013/09/03 23:36:05]

Left it as is for now.

+    virtual ~UIResourceHolder();
+  };
 
  private:
   NinePatchLayer();
   virtual ~NinePatchLayer();
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
 
-  void CreateUpdaterIfNeeded();
-  void CreateResource();
-
-  scoped_refptr<ImageLayerUpdater> updater_;
-  scoped_ptr<LayerUpdater::Resource> resource_;
-
-  SkBitmap bitmap_;
-  bool bitmap_dirty_;
+  gfx::Rect border_;
+  bool fill_center_;
+  scoped_ptr<UIResourceHolder> resource_;

[aelias_OOO_until_Jul13, 2013/08/30 06:20:41]

Rename this to ui_resource_holder_

[powei, 2013/09/03 23:36:05]

Done.

 
   // The transparent center region that shows the parent layer's contents in
   // image space.
   gfx::Rect image_aperture_;
 
   DISALLOW_COPY_AND_ASSIGN(NinePatchLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_NINE_PATCH_LAYER_H_