Java tutorial
//package com.java2s; /* * Copyright (C) 2010 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. */ public class Main { public static final int UNCONSTRAINED = -1; private static int computeInitialSampleSize(int w, int h, int minSideLength, int maxNumOfPixels) { if (maxNumOfPixels == UNCONSTRAINED && minSideLength == UNCONSTRAINED) return 1; int lowerBound = (maxNumOfPixels == UNCONSTRAINED) ? 1 : (int) Math.ceil(Math.sqrt((float) (w * h) / maxNumOfPixels)); if (minSideLength == UNCONSTRAINED) { return lowerBound; } else { int sampleSize = Math.min(w / minSideLength, h / minSideLength); return Math.max(sampleSize, lowerBound); } } }