cc/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_PRIORITY_CALCULATOR_H_
   6 #define CC_PRIORITY_CALCULATOR_H_
   7
   8 #include "cc/cc_export.h"
   9
  10 namespace gfx {
  11 class Rect;
  12 }
  13
  14 namespace cc {
  15
  16 class CC_EXPORT PriorityCalculator {
  17 public:
  18     static int uiPriority(bool drawsToRootSurface);
  19     static int visiblePriority(bool drawsToRootSurface);
  20     static int renderSurfacePriority();
  21     static int lingeringPriority(int previousPriority);
  22     static int priorityFromDistance(const gfx::Rect& visibleRect, const gfx::Rect& textureRect, bool drawsToRootSurface);
  23     static int smallAnimatedLayerMinPriority();
  24
  25     static int highestPriority();
  26     static int lowestPriority();
  27     static inline bool priorityIsLower(int a, int b) { return a > b; }
  28     static inline bool priorityIsHigher(int a, int b) { return a < b; }
  29     static inline int maxPriority(int a, int b) { return priorityIsHigher(a, b) ? a : b; }
  30
  31     static int allowNothingCutoff();
  32     static int allowVisibleOnlyCutoff();
  33     static int allowVisibleAndNearbyCutoff();
  34     static int allowEverythingCutoff();
  35 };
  36
  37 }
  38
  39 #endif  // CC_PRIORITY_CALCULATOR_H_