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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 LayerUpdater_h
#define LayerUpdater_h
#include "base/memory/ref_counted.h"
#include "cc/prioritized_texture.h"
#include "third_party/khronos/GLES2/gl2.h"
namespace cc {
class IntRect;
class IntSize;
class TextureManager;
struct RenderingStats;
class TextureUpdateQueue;
class LayerUpdater : public base::RefCounted<LayerUpdater> {
public:
// Allows texture uploaders to store per-tile resources.
class Texture {
public:
virtual ~Texture();
PrioritizedTexture* texture() { return m_texture.get(); }
void swapTextureWith(scoped_ptr<PrioritizedTexture>& texture) { m_texture.swap(texture); }
// TODO(reveman): partialUpdate should be a property of this class
// instead of an argument passed to update().
virtual void update(TextureUpdateQueue&, const IntRect& sourceRect, const IntSize& destOffset, bool partialUpdate, RenderingStats&) = 0;
protected:
explicit Texture(scoped_ptr<PrioritizedTexture> texture);
private:
scoped_ptr<PrioritizedTexture> m_texture;
};
LayerUpdater() { }
virtual scoped_ptr<Texture> createTexture(PrioritizedTextureManager*) = 0;
// The |resultingOpaqueRect| 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 IntRect& contentRect, const IntSize& tileSize, float contentsWidthScale, float contentsHeightScale, IntRect& resultingOpaqueRect, RenderingStats&) { }
// Set true by the layer when it is known that the entire output is going to be opaque.
virtual void setOpaque(bool) { }
protected:
virtual ~LayerUpdater() { }
private:
friend class base::RefCounted<LayerUpdater>;
};
} // namespace cc
#endif // LayerUpdater_h
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