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// Copyright 2012 The Chromium Authors
// 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 <memory>
#include "cc/cc_export.h"
#include "cc/layers/layer.h"
#include "cc/layers/ui_resource_layer.h"
#include "cc/resources/ui_resource_client.h"
#include "ui/gfx/geometry/rect.h"
namespace cc {
class CC_EXPORT NinePatchLayer : public UIResourceLayer {
public:
static scoped_refptr<NinePatchLayer> Create();
NinePatchLayer(const NinePatchLayer&) = delete;
NinePatchLayer& operator=(const NinePatchLayer&) = delete;
// |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(const 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 SetAperture(const gfx::Rect& aperture);
void SetFillCenter(bool fill_center);
// |rect| is the space completely occluded by another layer in layer
// space. This can be used for example to occlude the entire window's
// content when drawing the shadow with a 9 patches layer.
void SetLayerOcclusion(const gfx::Rect& occlusion);
private:
NinePatchLayer();
~NinePatchLayer() override;
std::unique_ptr<LayerImpl> CreateLayerImpl(
LayerTreeImpl* tree_impl) const override;
void PushDirtyPropertiesTo(
LayerImpl* layer,
uint8_t dirty_flag,
const CommitState& commit_state,
const ThreadUnsafeCommitState& unsafe_state) override;
ProtectedSequenceReadable<gfx::Rect> border_;
ProtectedSequenceReadable<bool> fill_center_;
// The transparent center region that shows the parent layer's contents in
// image space.
ProtectedSequenceReadable<gfx::Rect> image_aperture_;
// The occluded region in layer space set by SetLayerOcclusion. It is
// usually larger than |image_aperture_|.
ProtectedSequenceReadable<gfx::Rect> layer_occlusion_;
};
} // namespace cc
#endif // CC_LAYERS_NINE_PATCH_LAYER_H_
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