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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_LAYER_UPDATER_H_
#define CC_RESOURCES_LAYER_UPDATER_H_
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/vector2d.h"
namespace cc {
class PrioritizedResource;
class PrioritizedResourceManager;
class ResourceUpdateQueue;
class TextureManager;
class CC_EXPORT LayerUpdater : public base::RefCounted<LayerUpdater> {
public:
// Allows updaters to store per-resource update properties.
class CC_EXPORT Resource {
public:
virtual ~Resource();
PrioritizedResource* texture() { return texture_.get(); }
// TODO(reveman): partial_update should be a property of this class
// instead of an argument passed to Update().
virtual void Update(ResourceUpdateQueue* queue,
const gfx::Rect& source_rect,
const gfx::Vector2d& dest_offset,
bool partial_update) = 0;
protected:
explicit Resource(scoped_ptr<PrioritizedResource> texture);
private:
scoped_ptr<PrioritizedResource> texture_;
DISALLOW_COPY_AND_ASSIGN(Resource);
};
LayerUpdater() {}
virtual scoped_ptr<Resource> CreateResource(
PrioritizedResourceManager* manager) = 0;
// The |resulting_opaque_rect| gives back a region of the layer that was
// painted opaque. If the layer is marked opaque in the updater, then this
// region should be ignored in preference for the entire layer's area.
virtual void PrepareToUpdate(const gfx::Rect& content_rect,
const gfx::Size& tile_size,
float contents_width_scale,
float contents_height_scale,
gfx::Rect* resulting_opaque_rect) {}
virtual void ReduceMemoryUsage() {}
// Set true by the layer when it is known that the entire output is going to
// be opaque.
virtual void SetOpaque(bool opaque) {}
// Set true by the layer when it is known that the entire output bounds will
// be rasterized.
virtual void SetFillsBoundsCompletely(bool fills_bounds) {}
protected:
virtual ~LayerUpdater() {}
private:
friend class base::RefCounted<LayerUpdater>;
DISALLOW_COPY_AND_ASSIGN(LayerUpdater);
};
} // namespace cc
#endif // CC_RESOURCES_LAYER_UPDATER_H_
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