Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/* Copyright_License {
    
 XCSoar Glide Computer - http://www.xcsoar.org/
 Copyright (C) 2000-2016 The XCSoar Project
 A detailed list of copyright holders can be found in the file "AUTHORS".
    
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.
    
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
    
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 }
 */

import android.graphics.Bitmap;
import android.graphics.Paint;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;

public class Main {
    /**
     * Convert the Bitmap to ALPHA_8.  The old one will be recycled.
     */
    static Bitmap toAlpha8(Bitmap src, boolean recycle) {
        if (!src.hasAlpha()) {
            src = redToAlpha(src, recycle);
            recycle = true;
        }

        Bitmap dest = src.copy(Bitmap.Config.ALPHA_8, false);
        if (recycle)
            src.recycle();
        return dest;
    }

    /**
     * Copy the red channel to a new Bitmap's alpha channel.  The old
     * one will be recycled.
     */
    static Bitmap redToAlpha(Bitmap src, boolean recycle) {
        Bitmap dest = Bitmap.createBitmap(src.getWidth(), src.getHeight(), Bitmap.Config.ARGB_8888);

        float[] matrix = new float[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 };

        Paint paint = new Paint();
        paint.setColorFilter(new ColorMatrixColorFilter(new ColorMatrix(matrix)));

        Canvas canvas = new Canvas(dest);
        canvas.setDensity(Bitmap.DENSITY_NONE);
        canvas.drawBitmap(src, 0, 0, paint);

        if (recycle)
            src.recycle();
        return dest;
    }
}