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// Copyright 2012 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.
#include "config.h"
#include "CCPriorityCalculator.h"
using namespace std;
namespace WebCore {
// static
int CCPriorityCalculator::uiPriority(bool drawsToRootSurface)
{
return drawsToRootSurface ? -1 : 2;
}
// static
int CCPriorityCalculator::visiblePriority(bool drawsToRootSurface)
{
return drawsToRootSurface ? 0 : 3;
}
// static
int CCPriorityCalculator::renderSurfacePriority()
{
return 1;
}
// static
int CCPriorityCalculator::lingeringPriority(int previousPriority)
{
// FIXME: We should remove this once we have priorities for all
// textures (we can't currently calculate distances for
// off-screen textures).
int lingeringPriority = 1000000;
return min(numeric_limits<int>::max() - 1,
max(lingeringPriority, previousPriority)) + 1;
}
namespace {
unsigned manhattanDistance(const IntRect& a, const IntRect& b)
{
IntRect c = unionRect(a, b);
int x = max(0, c.width() - a.width() - b.width() + 1);
int y = max(0, c.height() - a.height() - b.height() + 1);
return (x + y);
}
}
int CCPriorityCalculator::priorityFromDistance(const IntRect& visibleRect, const IntRect& textureRect, bool drawsToRootSurface) const
{
unsigned distance = manhattanDistance(visibleRect, textureRect);
if (!distance)
return visiblePriority(drawsToRootSurface);
return visiblePriority(false) + distance;
}
int CCPriorityCalculator::priorityFromDistance(unsigned pixels, bool drawsToRootSurface) const
{
if (!pixels)
return visiblePriority(drawsToRootSurface);
return visiblePriority(false) + pixels;
}
int CCPriorityCalculator::priorityFromVisibility(bool visible, bool drawsToRootSurface) const
{
return visible ? visiblePriority(drawsToRootSurface) : lowestPriority();
}
} // WebCore
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