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// Copyright 2015 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_PLAYBACK_DISCARDABLE_IMAGE_MAP_H_
#define CC_PLAYBACK_DISCARDABLE_IMAGE_MAP_H_
#include <utility>
#include <vector>
#include "cc/base/cc_export.h"
#include "cc/base/rtree.h"
#include "cc/playback/draw_image.h"
#include "skia/ext/refptr.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
class SkImage;
namespace cc {
// Helper function to apply the matrix to the rect and return the result.
SkRect MapRect(const SkMatrix& matrix, const SkRect& src);
// Helper funciton to extract a scale from the matrix. Returns true on success
// and false on failure.
bool ExtractScale(const SkMatrix& matrix, SkSize* scale);
// This class is used for generating discardable images data (see DrawImage
// for the type of data it stores). It allows the client to query a particular
// rect and get back a list of DrawImages in that rect.
class CC_EXPORT DiscardableImageMap {
public:
class CC_EXPORT ScopedMetadataGenerator {
public:
ScopedMetadataGenerator(DiscardableImageMap* image_map,
const gfx::Size& bounds);
~ScopedMetadataGenerator();
SkCanvas* canvas() { return metadata_canvas_.get(); }
private:
DiscardableImageMap* image_map_;
skia::RefPtr<SkCanvas> metadata_canvas_;
};
DiscardableImageMap();
~DiscardableImageMap();
bool empty() const { return all_images_.empty(); }
void GetDiscardableImagesInRect(const gfx::Rect& rect,
float raster_scale,
std::vector<DrawImage>* images) const;
private:
friend class ScopedMetadataGenerator;
friend class DiscardableImageMapTest;
skia::RefPtr<SkCanvas> BeginGeneratingMetadata(const gfx::Size& bounds);
void EndGeneratingMetadata();
std::vector<std::pair<DrawImage, gfx::Rect>> all_images_;
RTree images_rtree_;
};
} // namespace cc
#endif // CC_PLAYBACK_DISCARDABLE_IMAGE_MAP_H_
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