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/refptr.h"
  13 #include "third_party/skia/include/core/SkPixelRef.h"
  14
  15 namespace cc {
  16
  17 class ImageDecodeController {
  18  public:
  19   ImageDecodeController();
  20   ~ImageDecodeController();
  21
  22   scoped_refptr<ImageDecodeTask> GetTaskForPixelRef(SkPixelRef* pixel_ref,
  23                                                     int layer_id,
  24                                                     uint64_t prepare_tiles_id);
  25
  26   // Note that this function has to remain thread safe.
  27   void DecodePixelRef(SkPixelRef* pixel_ref);
  28
  29   // TODO(vmpstr): This should go away once the controller is decoding images
  30   // based on priority and memory.
  31   void AddLayerUsedCount(int layer_id);
  32   void SubtractLayerUsedCount(int layer_id);
  33
  34   void OnImageDecodeTaskCompleted(int layer_id,
  35                                   SkPixelRef* pixel_ref,
  36                                   bool was_canceled);
  37
  38  private:
  39   scoped_refptr<ImageDecodeTask> CreateTaskForPixelRef(
  40       SkPixelRef* pixel_ref,
  41       int layer_id,
  42       uint64_t prepare_tiles_id);
  43
  44   using PixelRefTaskMap =
  45       base::hash_map<uint32_t, scoped_refptr<ImageDecodeTask>>;
  46   using LayerPixelRefTaskMap = base::hash_map<int, PixelRefTaskMap>;
  47   LayerPixelRefTaskMap image_decode_tasks_;
  48
  49   using LayerCountMap = base::hash_map<int, int>;
  50   LayerCountMap used_layer_counts_;
  51 };
  52
  53 }  // namespace cc
  54
  55 #endif  // CC_TILES_IMAGE_DECODE_CONTROLLER_H_