Snippet156.java Source code

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/*
 * example snippet: convert between SWT Image and AWT BufferedImage
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.WritableRaster;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class Snippet156 {

    static BufferedImage convertToAWT(ImageData data) {
        ColorModel colorModel = null;
        PaletteData palette = data.palette;
        if (palette.isDirect) {
            colorModel = new DirectColorModel(data.depth, palette.redMask, palette.greenMask, palette.blueMask);
            BufferedImage bufferedImage = new BufferedImage(colorModel,
                    colorModel.createCompatibleWritableRaster(data.width, data.height), false, null);
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[3];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    int pixel = data.getPixel(x, y);
                    RGB rgb = palette.getRGB(pixel);
                    pixelArray[0] = rgb.red;
                    pixelArray[1] = rgb.green;
                    pixelArray[2] = rgb.blue;
                    raster.setPixels(x, y, 1, 1, pixelArray);
                }
            }
            return bufferedImage;
        } else {
            RGB[] rgbs = palette.getRGBs();
            byte[] red = new byte[rgbs.length];
            byte[] green = new byte[rgbs.length];
            byte[] blue = new byte[rgbs.length];
            for (int i = 0; i < rgbs.length; i++) {
                RGB rgb = rgbs[i];
                red[i] = (byte) rgb.red;
                green[i] = (byte) rgb.green;
                blue[i] = (byte) rgb.blue;
            }
            if (data.transparentPixel != -1) {
                colorModel = new IndexColorModel(data.depth, rgbs.length, red, green, blue, data.transparentPixel);
            } else {
                colorModel = new IndexColorModel(data.depth, rgbs.length, red, green, blue);
            }
            BufferedImage bufferedImage = new BufferedImage(colorModel,
                    colorModel.createCompatibleWritableRaster(data.width, data.height), false, null);
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[1];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    int pixel = data.getPixel(x, y);
                    pixelArray[0] = pixel;
                    raster.setPixel(x, y, pixelArray);
                }
            }
            return bufferedImage;
        }
    }

    static ImageData convertToSWT(BufferedImage bufferedImage) {
        if (bufferedImage.getColorModel() instanceof DirectColorModel) {
            DirectColorModel colorModel = (DirectColorModel) bufferedImage.getColorModel();
            PaletteData palette = new PaletteData(colorModel.getRedMask(), colorModel.getGreenMask(),
                    colorModel.getBlueMask());
            ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(),
                    colorModel.getPixelSize(), palette);
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[3];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    raster.getPixel(x, y, pixelArray);
                    int pixel = palette.getPixel(new RGB(pixelArray[0], pixelArray[1], pixelArray[2]));
                    data.setPixel(x, y, pixel);
                }
            }
            return data;
        } else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
            IndexColorModel colorModel = (IndexColorModel) bufferedImage.getColorModel();
            int size = colorModel.getMapSize();
            byte[] reds = new byte[size];
            byte[] greens = new byte[size];
            byte[] blues = new byte[size];
            colorModel.getReds(reds);
            colorModel.getGreens(greens);
            colorModel.getBlues(blues);
            RGB[] rgbs = new RGB[size];
            for (int i = 0; i < rgbs.length; i++) {
                rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF, blues[i] & 0xFF);
            }
            PaletteData palette = new PaletteData(rgbs);
            ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(),
                    colorModel.getPixelSize(), palette);
            data.transparentPixel = colorModel.getTransparentPixel();
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[1];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    raster.getPixel(x, y, pixelArray);
                    data.setPixel(x, y, pixelArray[0]);
                }
            }
            return data;
        }
        return null;
    }

    static ImageData createSampleImage(Display display) {
        Image image = new Image(display, 100, 100);
        Rectangle bounds = image.getBounds();
        GC gc = new GC(image);
        gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
        gc.fillRectangle(bounds);
        gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
        gc.fillOval(0, 0, bounds.width, bounds.height);
        gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
        gc.drawLine(0, 0, bounds.width, bounds.height);
        gc.drawLine(bounds.width, 0, 0, bounds.height);
        gc.dispose();
        ImageData data = image.getImageData();
        image.dispose();
        return data;
    }

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("SWT Image");
        ImageData data;
        if (args.length > 0) {
            String fileName = args[0];
            data = new ImageData(fileName);
        } else {
            data = createSampleImage(display);
        }
        final Image swtImage = new Image(display, data);
        final BufferedImage awtImage = convertToAWT(data);
        final Image swtImage2 = new Image(display, convertToSWT(awtImage));
        shell.addListener(SWT.Paint, new Listener() {
            public void handleEvent(Event e) {
                int y = 10;
                if (swtImage != null) {
                    e.gc.drawImage(swtImage, 10, y);
                    y += swtImage.getBounds().height + 10;
                }
                if (swtImage2 != null) {
                    e.gc.drawImage(swtImage2, 10, y);
                }
            }
        });
        Frame frame = new Frame() {
            public void paint(Graphics g) {
                Insets insets = getInsets();
                if (awtImage != null) {
                    g.drawImage(awtImage, 10 + insets.left, 10 + insets.top, null);
                }
            }
        };
        frame.setTitle("AWT Image");
        shell.setLocation(50, 50);
        Rectangle bounds = swtImage.getBounds();
        shell.setSize(bounds.width + 50, bounds.height * 2 + 100);
        Point size = shell.getSize();
        Point location = shell.getLocation();
        Insets insets = frame.getInsets();
        frame.setLocation(location.x + size.x + 10, location.y);
        frame.setSize(size.x - (insets.left + insets.right), size.y - (insets.top + insets.bottom));
        frame.setVisible(true);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        if (swtImage != null)
            swtImage.dispose();
        if (swtImage2 != null)
            swtImage.dispose();
        frame.dispose();
        System.exit(0);
    }
}