cc/tiles/image_decode_controller.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_TILES_IMAGE_DECODE_CONTROLLER_H_
   6 #define CC_TILES_IMAGE_DECODE_CONTROLLER_H_
   7
   8 #include "base/containers/hash_tables.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "cc/base/cc_export.h"
  11 #include "cc/raster/tile_task_runner.h"
  12 #include "skia/ext/discardable_image_utils.h"
  13 #include "skia/ext/refptr.h"
  14
  15 namespace cc {
  16
  17 class ImageDecodeController {
  18  public:
  19   ImageDecodeController();
  20   ~ImageDecodeController();
  21
  22   scoped_refptr<ImageDecodeTask> GetTaskForImage(
  23       const skia::PositionImage& image,
  24       int layer_id,
  25       uint64_t prepare_tiles_id);
  26
  27   // Note that this function has to remain thread safe.
  28   void DecodeImage(const SkImage* image);
  29
  30   // TODO(vmpstr): This should go away once the controller is decoding images
  31   // based on priority and memory.
  32   void AddLayerUsedCount(int layer_id);
  33   void SubtractLayerUsedCount(int layer_id);
  34
  35   void OnImageDecodeTaskCompleted(int layer_id,
  36                                   const SkImage* image,
  37                                   bool was_canceled);
  38
  39  private:
  40   scoped_refptr<ImageDecodeTask> CreateTaskForImage(const SkImage* image,
  41                                                     int layer_id,
  42                                                     uint64_t prepare_tiles_id);
  43
  44   using ImageTaskMap = base::hash_map<uint32_t, scoped_refptr<ImageDecodeTask>>;
  45   using LayerImageTaskMap = base::hash_map<int, ImageTaskMap>;
  46   LayerImageTaskMap image_decode_tasks_;
  47
  48   using LayerCountMap = base::hash_map<int, int>;
  49   LayerCountMap used_layer_counts_;
  50 };
  51
  52 }  // namespace cc
  53
  54 #endif  // CC_TILES_IMAGE_DECODE_CONTROLLER_H_