Android Hash Code Calculate hashBitmap(Bitmap bitmap)

Description

hash Bitmap

License

Apache License

Declaration

public static int hashBitmap(Bitmap bitmap) 

Method Source Code

//package com.java2s;
/**//from  w  ww  . j a v  a 2s.  c om
 * 
 * Copyright 2008 - 2011
 * 
 * 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.
 * 
 * @project loonframework
 * @author chenpeng
 * @email ceponline@yahoo.com.cn
 * @version 0.1.2
 */

import android.graphics.Bitmap;

public class Main {

    public static int hashBitmap(Bitmap bitmap) {
        int hash_result = 0;
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        hash_result = (hash_result << 7) ^ h;
        hash_result = (hash_result << 7) ^ w;
        for (int pixel = 0; pixel < 20; ++pixel) {
            int x = (pixel * 50) % w;
            int y = (pixel * 100) % h;
            hash_result = (hash_result << 7) ^ bitmap.getPixel(x, y);
        }
        return hash_result;
    }
}

Related

1. hash(int seed, Object o)
2. hash(int seed, boolean x)
3. hash(int seed, int x)
4. hash2jsonBytes(Map hash)
5. hashBitmap(Bitmap bitmap)
6. hashCode(T a)
7. hashCode(T a, T b)
8. hashCode(T a, T b, T c)
9. hashCode(T a, T b, T c, T d)