cc/resources/priority_calculator.h

   1 // Copyright 2010 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_PRIORITY_CALCULATOR_H_
   6 #define CC_RESOURCES_PRIORITY_CALCULATOR_H_
   7
   8 #include "base/basictypes.h"
   9 #include "cc/base/cc_export.h"
  10
  11 namespace gfx { class Rect; }
  12
  13 namespace cc {
  14
  15 class CC_EXPORT PriorityCalculator {
  16  public:
  17   PriorityCalculator() {}
  18
  19   static int UIPriority(bool draws_to_root_surface);
  20   static int VisiblePriority(bool draws_to_root_surface);
  21   static int RenderSurfacePriority();
  22   static int LingeringPriority(int previous_priority);
  23   static int PriorityFromDistance(const gfx::Rect& visible_rect,
  24                                   const gfx::Rect& texture_rect,
  25                                   bool draws_to_root_surface);
  26   static int SmallAnimatedLayerMinPriority();
  27
  28   static int HighestPriority();
  29   static int LowestPriority();
  30   static inline bool priority_is_lower(int a, int b) { return a > b; }
  31   static inline bool priority_is_higher(int a, int b) { return a < b; }
  32   static inline int max_priority(int a, int b) {
  33     return priority_is_higher(a, b) ? a : b;
  34   }
  35
  36   static int AllowNothingCutoff();
  37   static int AllowVisibleOnlyCutoff();
  38   static int AllowVisibleAndNearbyCutoff();
  39   static int AllowEverythingCutoff();
  40
  41  private:
  42   DISALLOW_COPY_AND_ASSIGN(PriorityCalculator);
  43 };
  44
  45 }  // namespace cc
  46
  47 #endif  // CC_RESOURCES_PRIORITY_CALCULATOR_H_