cc/resources/managed_tile_state.h

   1 // Copyright 2013 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_RESOURCES_MANAGED_TILE_STATE_H_
   6 #define CC_RESOURCES_MANAGED_TILE_STATE_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "cc/resources/platform_color.h"
  10 #include "cc/resources/rasterizer.h"
  11 #include "cc/resources/resource_pool.h"
  12 #include "cc/resources/resource_provider.h"
  13 #include "cc/resources/scoped_resource.h"
  14 #include "cc/resources/tile_priority.h"
  15
  16 namespace cc {
  17
  18 class TileManager;
  19
  20 // Tile manager classifying tiles into a few basic bins:
  21 enum ManagedTileBin {
  22   NOW_AND_READY_TO_DRAW_BIN = 0,  // Ready to draw and within viewport.
  23   NOW_BIN = 1,                    // Needed ASAP.
  24   SOON_BIN = 2,                   // Impl-side version of prepainting.
  25   EVENTUALLY_AND_ACTIVE_BIN = 3,  // Nice to have, and has a task or resource.
  26   EVENTUALLY_BIN = 4,             // Nice to have, if we've got memory and time.
  27   AT_LAST_AND_ACTIVE_BIN = 5,     // Only do this after all other bins.
  28   AT_LAST_BIN = 6,                // Only do this after all other bins.
  29   NEVER_BIN = 7,                  // Dont bother.
  30   NUM_BINS = 8
  31   // NOTE: Be sure to update ManagedTileBinAsValue and kBinPolicyMap when adding
  32   // or reordering fields.
  33 };
  34 scoped_ptr<base::Value> ManagedTileBinAsValue(ManagedTileBin bin);
  35
  36 // This is state that is specific to a tile that is
  37 // managed by the TileManager.
  38 class CC_EXPORT ManagedTileState {
  39  public:
  40   // This class holds all the state relevant to drawing a tile.
  41   class CC_EXPORT DrawInfo {
  42    public:
  43     enum Mode { RESOURCE_MODE, SOLID_COLOR_MODE, PICTURE_PILE_MODE };
  44
  45     DrawInfo();
  46     ~DrawInfo();
  47
  48     Mode mode() const { return mode_; }
  49
  50     bool IsReadyToDraw() const;
  51
  52     ResourceProvider::ResourceId get_resource_id() const {
  53       DCHECK(mode_ == RESOURCE_MODE);
  54       DCHECK(resource_);
  55
  56       return resource_->id();
  57     }
  58
  59     SkColor get_solid_color() const {
  60       DCHECK(mode_ == SOLID_COLOR_MODE);
  61
  62       return solid_color_;
  63     }
  64
  65     bool contents_swizzled() const {
  66       DCHECK(resource_);
  67       return !PlatformColor::SameComponentOrder(resource_->format());
  68     }
  69
  70     bool requires_resource() const {
  71       return mode_ == RESOURCE_MODE || mode_ == PICTURE_PILE_MODE;
  72     }
  73
  74     inline bool has_resource() const { return !!resource_; }
  75
  76     void SetSolidColorForTesting(SkColor color) { set_solid_color(color); }
  77     void SetResourceForTesting(scoped_ptr<ScopedResource> resource) {
  78       resource_ = resource.Pass();
  79     }
  80
  81    private:
  82     friend class TileManager;
  83     friend class PrioritizedTileSet;
  84     friend class Tile;
  85     friend class ManagedTileState;
  86
  87     void set_use_resource() { mode_ = RESOURCE_MODE; }
  88
  89     void set_solid_color(const SkColor& color) {
  90       mode_ = SOLID_COLOR_MODE;
  91       solid_color_ = color;
  92     }
  93
  94     void set_rasterize_on_demand() { mode_ = PICTURE_PILE_MODE; }
  95
  96     Mode mode_;
  97     SkColor solid_color_;
  98     scoped_ptr<ScopedResource> resource_;
  99   };
 100
 101   ManagedTileState();
 102   ~ManagedTileState();
 103
 104   void AsValueInto(base::debug::TracedValue* dict) const;
 105
 106   // Persisted state: valid all the time.
 107   DrawInfo draw_info;
 108   scoped_refptr<RasterTask> raster_task;
 109
 110   ManagedTileBin bin;
 111
 112   TileResolution resolution;
 113   bool required_for_activation;
 114   TilePriority::PriorityBin priority_bin;
 115   float distance_to_visible;
 116   bool visible_and_ready_to_draw;
 117
 118   // Priority for this state from the last time we assigned memory.
 119   unsigned scheduled_priority;
 120 };
 121
 122 }  // namespace cc
 123
 124 #endif  // CC_RESOURCES_MANAGED_TILE_STATE_H_