make Transparent Edges - Java 2D Graphics

Java examples for 2D Graphics:Color Alpha

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Description

make Transparent Edges

Demo Code

/*//from  w  w  w .j  ava 2s  .co m
    JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine
    Release Version 2.4

    A project from the Physics Dept, The University of Oxford

    Copyright (C) 2007-2010 The University of Oxford

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2 as published by
    the Free Software Foundation.

    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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
         
    Details (including contact information) can be found at: 

    jpc.sourceforge.net
    or the developer website
    sourceforge.net/projects/jpc/

    Conceived and Developed by:
    Rhys Newman, Ian Preston, Chris Dennis

    End of licence header
 */
//package com.java2s;
import java.awt.*;

import java.awt.image.*;

public class Main {
    public static BufferedImage makeTransparentEdges(BufferedImage src) {
        return makeTransparentEdges(src, 0, null);
    }

    public static BufferedImage makeTransparentEdges(BufferedImage src,
            float fraction, Color blend) {
        BufferedImage result = new BufferedImage(src.getWidth(),
                src.getHeight(), BufferedImage.TYPE_INT_ARGB);

        int bg = src.getRGB(0, 0);
        float r1 = 0, g1 = 0, b1 = 0;
        if (blend != null) {
            r1 = blend.getRed() * (1 - fraction);
            g1 = blend.getGreen() * (1 - fraction);
            b1 = blend.getBlue() * (1 - fraction);
        }

        for (int i = 0; i < src.getWidth(); i++)
            for (int j = 0; j < src.getHeight(); j++) {
                int rgb = src.getRGB(i, j);
                if (rgb == bg)
                    result.setRGB(i, j, 0x00000000);
                else {
                    if (blend != null) {
                        int a = blend.getAlpha();
                        int r = 0xFF & (rgb >> 16);
                        int g = 0xFF & (rgb >> 8);
                        int b = 0xFF & rgb;

                        r = (int) (fraction * r + r1);
                        g = (int) (fraction * g + g1);
                        b = (int) (fraction * b + b1);

                        rgb = (a << 24) | (r << 16) | (g << 8) | b;
                    }

                    result.setRGB(i, j, rgb);
                }
            }

        return result;
    }
}

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