cc/CCPriorityCalculator.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 CCPriorityCalculator_h
   6 #define CCPriorityCalculator_h
   7
   8 #include "GraphicsContext3D.h"
   9 #include "IntRect.h"
  10 #include "IntSize.h"
  11
  12 namespace WebCore {
  13
  14 class CCPriorityCalculator {
  15 public:
  16     static int uiPriority(bool drawsToRootSurface);
  17     static int visiblePriority(bool drawsToRootSurface);
  18     static int renderSurfacePriority();
  19     static int lingeringPriority(int previousPriority);
  20     int priorityFromDistance(const IntRect& visibleRect, const IntRect& textureRect, bool drawsToRootSurface) const;
  21     int priorityFromDistance(unsigned pixels, bool drawsToRootSurface) const;
  22     int priorityFromVisibility(bool visible, bool drawsToRootSurface) const;
  23
  24     static inline int highestPriority() { return std::numeric_limits<int>::min(); }
  25     static inline int lowestPriority() { return std::numeric_limits<int>::max(); }
  26     static inline bool priorityIsLower(int a, int b) { return a > b; }
  27     static inline bool priorityIsHigher(int a, int b) { return a < b; }
  28     static inline bool maxPriority(int a, int b) { return priorityIsHigher(a, b) ? a : b; }
  29 };
  30
  31 }
  32
  33 #endif