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// 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 CC_LAYERS_CONTENT_LAYER_CLIENT_H_
#define CC_LAYERS_CONTENT_LAYER_CLIENT_H_
#include <stddef.h>
#include "cc/cc_export.h"
#include "cc/paint/display_item_list.h"
namespace gfx {
class Rect;
}
namespace cc {
class CC_EXPORT ContentLayerClient {
public:
enum PaintingControlSetting {
PAINTING_BEHAVIOR_NORMAL,
PAINTING_BEHAVIOR_NORMAL_FOR_TEST,
DISPLAY_LIST_CONSTRUCTION_DISABLED,
DISPLAY_LIST_CACHING_DISABLED,
DISPLAY_LIST_PAINTING_DISABLED,
SUBSEQUENCE_CACHING_DISABLED,
PARTIAL_INVALIDATION,
};
// The paintable region is the rectangular region, within the bounds of the
// layer this client paints, that the client is capable of painting via
// paintContents(). Calling paintContents() will return a DisplayItemList
// that is guaranteed valid only within this region.
virtual gfx::Rect PaintableRegion() = 0;
// Paints the content area for the layer, typically dirty rects submitted
// to the layer itself, into a DisplayItemList that it returns. The
// PaintingControlSetting enum controls painting to isolate different
// components in performance tests.
virtual scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
PaintingControlSetting painting_control) = 0;
// If true the layer may skip clearing the background before rasterizing,
// because it will cover any uncleared data with content.
virtual bool FillsBoundsCompletely() const = 0;
// Returns an estimate of the current memory usage within this object,
// excluding memory shared with painting artifacts (i.e.,
// DisplayItemList). Should be invoked after PaintContentsToDisplayList,
// so that the result includes data cached internally during painting.
virtual size_t GetApproximateUnsharedMemoryUsage() const = 0;
protected:
virtual ~ContentLayerClient() {}
};
} // namespace cc
#endif // CC_LAYERS_CONTENT_LAYER_CLIENT_H_
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