1 /* libs/graphics/sgl/SkTSort.h 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #ifndef SkTSort_DEFINED 19 #define SkTSort_DEFINED 20 21 #include "SkTypes.h" 22 23 template <typename T> 24 void SkTHeapSort_SiftDown(T array[], int root, int bottom) { 25 while (root*2 + 1 <= bottom) { 26 int child = root * 2 + 1; 27 if (child+1 <= bottom && array[child] < array[child+1]) { 28 child += 1; 29 } 30 if (array[root] < array[child]) { 31 SkTSwap<T>(array[root], array[child]); 32 root = child; 33 } else { 34 break; 35 } 36 } 37 } 38 39 template <typename T> void SkTHeapSort(T array[], int count) { 40 int i; 41 for (i = count/2 - 1; i >= 0; --i) { 42 SkTHeapSort_SiftDown<T>(array, i, count-1); 43 } 44 for (i = count - 1; i > 0; --i) { 45 SkTSwap<T>(array[0], array[i]); 46 SkTHeapSort_SiftDown<T>(array, 0, i-1); 47 } 48 } 49 50 #endif 51
