[blimp] Add SkPicture caching support.

cc/playback/display_item_list.h

 // Copyright 2014 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_DISPLAY_ITEM_LIST_H_
 #define CC_PLAYBACK_DISPLAY_ITEM_LIST_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/contiguous_container.h"
 #include "cc/playback/discardable_image_map.h"
 #include "cc/playback/display_item.h"
 #include "cc/playback/display_item_list_settings.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "ui/gfx/geometry/rect.h"
 
 class SkCanvas;
 class SkPictureRecorder;
 
 namespace cc {
+class ClientPictureCache;
 class DisplayItem;
 class DrawingDisplayItem;
-class ImageSerializationProcessor;
+class EnginePictureCache;
 
 namespace proto {
 class DisplayItemList;
 }
 
 class CC_EXPORT DisplayItemList
     : public base::RefCountedThreadSafe<DisplayItemList> {
  public:
   // Creates a display item list. If picture caching is used, then layer_rect
   // specifies the cull rect of the display item list (the picture will not
   // exceed this rect). If picture caching is not used, then the given rect can
   // be empty.
   // TODO(vmpstr): Maybe this cull rect can be part of the settings instead.
   static scoped_refptr<DisplayItemList> Create(
       const gfx::Rect& layer_rect,
       const DisplayItemListSettings& settings);
 
   // Creates a DisplayItemList from a Protobuf.
   // TODO(dtrainor): Pass in a list of possible DisplayItems to reuse
   // (crbug.com/548434).
   static scoped_refptr<DisplayItemList> CreateFromProto(
       const proto::DisplayItemList& proto,
-      ImageSerializationProcessor* image_serialization_processor);
+      ClientPictureCache* client_picture_cache);
 
   // Creates a Protobuf representing the state of this DisplayItemList.
   // TODO(dtrainor): Don't resend DisplayItems that were already serialized
   // (crbug.com/548434).
-  void ToProtobuf(proto::DisplayItemList* proto,
-                  ImageSerializationProcessor* image_serialization_processor);
+  void ToProtobuf(proto::DisplayItemList* proto);
+
+  // Informs the EnginePictureCache about which SkPictures that are in use.
+  void MarkForRegistrationEngine(EnginePictureCache* engine_picture_cache);
+  void MarkForUnregistrationEngine(EnginePictureCache* engine_picture_cache);
+
+  // Informs the ClientPictureCache about which SkPictures that are in use.
+  void MarkForRegistrationClient(ClientPictureCache* client_picture_cache);
+  void MarkForUnregistrationClient(ClientPictureCache* client_picture_cache);
 
   void Raster(SkCanvas* canvas,
               SkPicture::AbortCallback* callback,
               const gfx::Rect& canvas_target_playback_rect,
               float contents_scale) const;
 
   // This is a fast path for use only if canvas_ is set and
   // retain_individual_display_items_ is false. This method also updates
   // is_suitable_for_gpu_rasterization_ and approximate_op_count_.
   void RasterIntoCanvas(const DisplayItem& display_item);
@@ skipping 47 matching lines @@
 
   void ProcessAppendedItem(const DisplayItem* item);
 
   ContiguousContainer<DisplayItem> items_;
   // The visual rects associated with each of the display items in the
   // display item list. There is one rect per display item, and the
   // position in |visual_rects_| matches the position of the item in
   // |items_| . These rects are intentionally kept separate
   // because they are not needed while walking the |items_| for raster.
   std::vector<gfx::Rect> visual_rects_;
+
+  // The engine SkPicture IDs associated with each of the display items in the
+  // display item list. There is one ID per display item, and the
+  // position in |engine_picture_ids_| matches the position of the item in
+  // |items_| . These IDs are intentionally kept separate
+  // because they are not needed while walking the |items_| for raster.
+  std::vector<uint32_t> engine_picture_ids_;
+
   sk_sp<SkPicture> picture_;
 
   std::unique_ptr<SkPictureRecorder> recorder_;
   const DisplayItemListSettings settings_;
   bool retain_individual_display_items_;
 
   gfx::Rect layer_rect_;
   bool is_suitable_for_gpu_rasterization_;
   int approximate_op_count_;
 
   // Memory usage due to the cached SkPicture.
   size_t picture_memory_usage_;
 
   DiscardableImageMap image_map_;
 
+  // |marked_| is true when the last call was for marking SkPictures for
+  // registration, and set to false when they are marked for unregistration.
+  // It is illegal to call the same method twice in a row.
+  bool marked_ = false;
+
   friend class base::RefCountedThreadSafe<DisplayItemList>;
   FRIEND_TEST_ALL_PREFIXES(DisplayItemListTest, ApproximateMemoryUsage);
   DISALLOW_COPY_AND_ASSIGN(DisplayItemList);
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_DISPLAY_ITEM_LIST_H_