blob: 6193dff8a8823da10a199418e7c83405402ed024 [file] [log] [blame]
/* libs/corecg/SkTSort.h
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifndef SkTSort_DEFINED
#define SkTSort_DEFINED
#include "SkTypes.h"
template <typename T>
void SkTHeapSort_SiftDown(T array[], int root, int bottom)
{
int root2 = root << 1;
while (root2 <= bottom)
{
int maxChild;
if (root2 == bottom)
maxChild = root2;
else if (array[root2] > array[root2 + 1])
maxChild = root2;
else
maxChild = root2 + 1;
if (array[root] < array[maxChild])
{
SkTSwap<T>(array[root], array[maxChild]);
root = maxChild;
root2 = root << 1;
}
else
break;
}
}
template <typename T>
void SkTHeapSort(T array[], int count)
{
int i;
for (i = count/2 - 1; i >= 0; --i)
SkTHeapSort_SiftDown<T>(array, i, count);
for (i = count - 2; i >= 0; --i)
{
SkTSwap<T>(array[0], array[i + 1]);
SkTHeapSort_SiftDown<T>(array, 0, i);
}
}
#endif