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// Copyright 2011 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_RESOURCES_SKPICTURE_CONTENT_LAYER_UPDATER_H_
#define CC_RESOURCES_SKPICTURE_CONTENT_LAYER_UPDATER_H_
#include "cc/resources/content_layer_updater.h"
#include "third_party/skia/include/core/SkPicture.h"
class SkCanvas;
namespace cc {
class LayerPainter;
// This class records the content_rect into an SkPicture. Subclasses, provide
// different implementations of tile updating based on this recorded picture.
// The BitmapSkPictureContentLayerUpdater and
// FrameBufferSkPictureContentLayerUpdater are two examples of such
// implementations.
class SkPictureContentLayerUpdater : public ContentLayerUpdater {
public:
class Resource : public LayerUpdater::Resource {
public:
Resource(SkPictureContentLayerUpdater* updater,
scoped_ptr<PrioritizedResource> texture);
virtual ~Resource();
virtual void Update(ResourceUpdateQueue* queue,
gfx::Rect source_rect,
gfx::Vector2d dest_offset,
bool partial_update,
RenderingStats* stats) OVERRIDE;
private:
SkPictureContentLayerUpdater* updater_;
DISALLOW_COPY_AND_ASSIGN(Resource);
};
static scoped_refptr<SkPictureContentLayerUpdater> Create(
scoped_ptr<LayerPainter> painter,
RenderingStatsInstrumentation* stats_instrumentation);
virtual scoped_ptr<LayerUpdater::Resource> CreateResource(
PrioritizedResourceManager* manager) OVERRIDE;
virtual void SetOpaque(bool opaque) OVERRIDE;
protected:
SkPictureContentLayerUpdater(
scoped_ptr<LayerPainter> painter,
RenderingStatsInstrumentation* stats_instrumentation);
virtual ~SkPictureContentLayerUpdater();
virtual void PrepareToUpdate(gfx::Rect content_rect,
gfx::Size tile_size,
float contents_width_scale,
float contents_height_scale,
gfx::Rect* resulting_opaque_rect,
RenderingStats* stats) OVERRIDE;
void DrawPicture(SkCanvas* canvas);
void UpdateTexture(ResourceUpdateQueue* queue,
PrioritizedResource* texture,
gfx::Rect source_rect,
gfx::Vector2d dest_offset,
bool partial_update);
bool layer_is_opaque() const { return layer_is_opaque_; }
private:
// Recording canvas.
SkPicture picture_;
// True when it is known that all output pixels will be opaque.
bool layer_is_opaque_;
DISALLOW_COPY_AND_ASSIGN(SkPictureContentLayerUpdater);
};
} // namespace cc
#endif // CC_RESOURCES_SKPICTURE_CONTENT_LAYER_UPDATER_H_
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