Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2006 The Android Open Source Project
 * Copyright (C) 2013 YIXIA.COM
 *
 * 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.
 */

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;

public class Main {
    private static final int OPTIONS_NONE = 0x0;
    private static final int OPTIONS_SCALE_UP = 0x1;
    public static final int OPTIONS_RECYCLE_INPUT = 0x2;

    public static Bitmap extractThumbnail(Bitmap source, int width, int height) {
        return extractThumbnail(source, width, height, OPTIONS_NONE);
    }

    public static Bitmap extractThumbnail(Bitmap source, int width, int height, int options) {
        if (source == null)
            return null;

        float scale;
        if (source.getWidth() < source.getHeight())
            scale = width / (float) source.getWidth();
        else
            scale = height / (float) source.getHeight();
        Matrix matrix = new Matrix();
        matrix.setScale(scale, scale);
        Bitmap thumbnail = transform(matrix, source, width, height, OPTIONS_SCALE_UP | options);
        return thumbnail;
    }

    private static Bitmap transform(Matrix scaler, Bitmap source, int targetWidth, int targetHeight, int options) {
        boolean scaleUp = (options & OPTIONS_SCALE_UP) != 0;
        boolean recycle = (options & OPTIONS_RECYCLE_INPUT) != 0;

        int deltaX = source.getWidth() - targetWidth;
        int deltaY = source.getHeight() - targetHeight;
        if (!scaleUp && (deltaX < 0 || deltaY < 0)) {
            Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(b2);

            int deltaXHalf = Math.max(0, deltaX / 2);
            int deltaYHalf = Math.max(0, deltaY / 2);
            Rect src = new Rect(deltaXHalf, deltaYHalf, deltaXHalf + Math.min(targetWidth, source.getWidth()),
                    deltaYHalf + Math.min(targetHeight, source.getHeight()));
            int dstX = (targetWidth - src.width()) / 2;
            int dstY = (targetHeight - src.height()) / 2;
            Rect dst = new Rect(dstX, dstY, targetWidth - dstX, targetHeight - dstY);
            c.drawBitmap(source, src, dst, null);
            if (recycle)
                source.recycle();
            return b2;
        }

        float bitmapWidthF = source.getWidth();
        float bitmapHeightF = source.getHeight();
        float bitmapAspect = bitmapWidthF / bitmapHeightF;
        float viewAspect = (float) targetWidth / targetHeight;

        float scale = bitmapAspect > viewAspect ? targetHeight / bitmapHeightF : targetWidth / bitmapWidthF;
        if (scale < .9F || scale > 1F)
            scaler.setScale(scale, scale);
        else
            scaler = null;

        Bitmap b1;
        if (scaler != null)
            b1 = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), scaler, true);
        else
            b1 = source;

        if (recycle && b1 != source)
            source.recycle();

        int dx1 = Math.max(0, b1.getWidth() - targetWidth);
        int dy1 = Math.max(0, b1.getHeight() - targetHeight);

        Bitmap b2 = Bitmap.createBitmap(b1, dx1 / 2, dy1 / 2, targetWidth, targetHeight);

        if (b2 != b1 && (recycle || b1 != source))
            b1.recycle();

        return b2;
    }
}