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/pixel_ref_utils.h"
  13 #include "skia/ext/refptr.h"
  14 #include "third_party/skia/include/core/SkPixelRef.h"
  15
  16 namespace cc {
  17
  18 class ImageDecodeController {
  19  public:
  20   ImageDecodeController();
  21   ~ImageDecodeController();
  22
  23   scoped_refptr<ImageDecodeTask> GetTaskForPixelRef(
  24       const skia::PositionPixelRef& pixel_ref,
  25       int layer_id,
  26       uint64_t prepare_tiles_id);
  27
  28   // Note that this function has to remain thread safe.
  29   void DecodePixelRef(SkPixelRef* pixel_ref);
  30
  31   // TODO(vmpstr): This should go away once the controller is decoding images
  32   // based on priority and memory.
  33   void AddLayerUsedCount(int layer_id);
  34   void SubtractLayerUsedCount(int layer_id);
  35
  36   void OnImageDecodeTaskCompleted(int layer_id,
  37                                   SkPixelRef* pixel_ref,
  38                                   bool was_canceled);
  39
  40  private:
  41   scoped_refptr<ImageDecodeTask> CreateTaskForPixelRef(
  42       SkPixelRef* pixel_ref,
  43       int layer_id,
  44       uint64_t prepare_tiles_id);
  45
  46   using PixelRefTaskMap =
  47       base::hash_map<uint32_t, scoped_refptr<ImageDecodeTask>>;
  48   using LayerPixelRefTaskMap = base::hash_map<int, PixelRefTaskMap>;
  49   LayerPixelRefTaskMap image_decode_tasks_;
  50
  51   using LayerCountMap = base::hash_map<int, int>;
  52   LayerCountMap used_layer_counts_;
  53 };
  54
  55 }  // namespace cc
  56
  57 #endif  // CC_TILES_IMAGE_DECODE_CONTROLLER_H_