cc: Nine patch layer.

cc/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 NinePatchLayer_h
+#define NinePatchLayer_h
+
+#include "base/memory/scoped_ptr.h"
+#include "cc/cc_export.h"
+#include "cc/layer.h"
+#include "cc/image_layer_updater.h"
+#include "ui/gfx/rect.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace cc {
+
+class ResourceUpdateQueue;
+
+class CC_EXPORT NinePatchLayer : public Layer {
+public:
+    static scoped_refptr<NinePatchLayer> create();
+
+    virtual bool drawsContent() const OVERRIDE;
+    virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
+    virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
+    virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
+
+    // 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, const gfx::Rect& aperture);
+
+private:
+    NinePatchLayer();
+    virtual ~NinePatchLayer();
+    virtual scoped_ptr<LayerImpl> createLayerImpl() OVERRIDE;
+
+    void createUpdaterIfNeeded();
+
+    scoped_refptr<ImageLayerUpdater> m_updater;
+    scoped_ptr<LayerUpdater::Resource> m_resource;
+
+    SkBitmap m_bitmap;
+    bool m_bitmapDirty;
+
+    // The transparent center region that shows the parent layer's contents in image space.
+    gfx::Rect m_imageAperture;
+};
+
+}
+
+#endif