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/* libs/graphics/sgl/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) {
while (root*2 + 1 <= bottom) {
int child = root * 2 + 1;
if (child+1 <= bottom && array[child] < array[child+1]) {
child += 1;
}
if (array[root] < array[child]) {
SkTSwap<T>(array[root], array[child]);
root = child;
} 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-1);
}
for (i = count - 1; i > 0; --i) {
SkTSwap<T>(array[0], array[i]);
SkTHeapSort_SiftDown<T>(array, 0, i-1);
}
}
#endif
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