1 files changed, 33 insertions, 0 deletions
diff --git a/cc/CCPriorityCalculator.h b/cc/CCPriorityCalculator.h
new file mode 100644
index 0000000..91ad766
--- /dev/null
+++ b/cc/CCPriorityCalculator.h
@@ -0,0 +1,33 @@
+// Copyright 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CCPriorityCalculator_h
+#define CCPriorityCalculator_h
+
+#include "GraphicsContext3D.h"
+#include "IntRect.h"
+#include "IntSize.h"
+
+namespace WebCore {
+
+class CCPriorityCalculator {
+public:
+    static int uiPriority(bool drawsToRootSurface);
+    static int visiblePriority(bool drawsToRootSurface);
+    static int renderSurfacePriority();
+    static int lingeringPriority(int previousPriority);
+    int priorityFromDistance(const IntRect& visibleRect, const IntRect& textureRect, bool drawsToRootSurface) const;
+    int priorityFromDistance(unsigned pixels, bool drawsToRootSurface) const;
+    int priorityFromVisibility(bool visible, bool drawsToRootSurface) const;
+
+    static inline int highestPriority() { return std::numeric_limits<int>::min(); }
+    static inline int lowestPriority() { return std::numeric_limits<int>::max(); }
+    static inline bool priorityIsLower(int a, int b) { return a > b; }
+    static inline bool priorityIsHigher(int a, int b) { return a < b; }
+    static inline bool maxPriority(int a, int b) { return priorityIsHigher(a, b) ? a : b; }
+};
+
+}
+
+#endif