| // 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_PAINT_DISCARDABLE_IMAGE_MAP_H_ |
| #define CC_PAINT_DISCARDABLE_IMAGE_MAP_H_ |
| |
| #include <unordered_map> |
| #include <utility> |
| #include <vector> |
| |
| #include "cc/base/rtree.h" |
| #include "cc/paint/draw_image.h" |
| #include "cc/paint/image_id.h" |
| #include "cc/paint/paint_export.h" |
| #include "third_party/skia/include/core/SkCanvas.h" |
| #include "third_party/skia/include/core/SkRefCnt.h" |
| #include "ui/gfx/geometry/rect.h" |
| #include "ui/gfx/geometry/size.h" |
| |
| namespace cc { |
| |
| // Helper function to apply the matrix to the rect and return the result. |
| SkRect MapRect(const SkMatrix& matrix, const SkRect& src); |
| |
| // 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_PAINT_EXPORT DiscardableImageMap { |
| public: |
| class CC_PAINT_EXPORT ScopedMetadataGenerator { |
| public: |
| ScopedMetadataGenerator(DiscardableImageMap* image_map, |
| const gfx::Size& bounds); |
| ~ScopedMetadataGenerator(); |
| |
| SkCanvas* canvas() { return metadata_canvas_.get(); } |
| |
| private: |
| DiscardableImageMap* image_map_; |
| std::unique_ptr<SkCanvas> metadata_canvas_; |
| }; |
| |
| DiscardableImageMap(); |
| ~DiscardableImageMap(); |
| |
| bool empty() const { return all_images_.empty(); } |
| void GetDiscardableImagesInRect(const gfx::Rect& rect, |
| float contents_scale, |
| std::vector<DrawImage>* images) const; |
| gfx::Rect GetRectForImage(ImageId image_id) const; |
| |
| private: |
| friend class ScopedMetadataGenerator; |
| friend class DiscardableImageMapTest; |
| |
| std::unique_ptr<SkCanvas> BeginGeneratingMetadata(const gfx::Size& bounds); |
| void EndGeneratingMetadata(); |
| |
| std::vector<std::pair<DrawImage, gfx::Rect>> all_images_; |
| std::unordered_map<ImageId, gfx::Rect> image_id_to_rect_; |
| |
| RTree images_rtree_; |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_PAINT_DISCARDABLE_IMAGE_MAP_H_ |