Java Image Create getImage(Component component)

Description

get Image

License

Apache License

Declaration

public static BufferedImage getImage(Component component) 

Method Source Code

//package com.java2s;
/*/*  w ww. j a va2 s  . c om*/
 * 
 * Copyright 2001-2004 The Apache Software Foundation
 * 
 * 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 java.awt.Component;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;

import java.awt.Transparency;

import java.awt.image.BufferedImage;

import java.awt.image.ColorModel;

import java.awt.image.PixelGrabber;

import javax.swing.ImageIcon;

public class Main {
    private static GraphicsConfiguration configuration = GraphicsEnvironment.getLocalGraphicsEnvironment()
            .getDefaultScreenDevice().getDefaultConfiguration();

    public static BufferedImage getImage(Component component) {
        if (component == null) {
            return null;
        }
        int width = component.getWidth();
        int height = component.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g = image.createGraphics();
        component.paintAll(g);
        g.dispose();
        return toBufferedImage(image);
    }

    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;
        }

        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();

        // Determine if the image has transparent pixels; for this method's
        // implementation, see e661 Determining If an Image Has Transparent Pixels
        boolean hasAlpha = hasAlpha(image);
        //        boolean hasAlpha = true;

        // Create a buffered image with a format that's compatible with the screen
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }

            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }

        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }

        // Copy image to buffered image
        Graphics g = bimage.createGraphics();

        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return bimage;
    }

    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage) image;
            return bimage.getColorModel().hasAlpha();
        }

        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
        PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }

        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }

    public static BufferedImage createCompatibleImage(int width, int height) {
        return configuration.createCompatibleImage(width, height);
    }
}

Related

1. createImageFromInvisibleComponent(JComponent component)
2. createImageFromVisibleComponent(JComponent comp, int cw, int ch)
3. createImagePanel(Image image, Color backColor)
4. getImage(Class clazz, String path)
5. getImage(Component component)
6. getImage(File imageFile)
7. getImage(final int width, final int height)
8. getImage(final String name)
9. getImage(ImageIcon imageIcon)