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Display an animated GIF

Display an animated GIF


/*
 * Image example snippet: display an animated GIF
 *
 * 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 org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet141 {
  static Display display;
  static Shell shell;
  static GC shellGC;
  static Color shellBackground;
  static ImageLoader loader;
  static ImageData[] imageDataArray;
  static Thread animateThread;
  static Image image;
  static final boolean useGIFBackground = false;
  
  public static void main(String[] args) {
    display = new Display();
    shell = new Shell(display);
    shell.setSize(300, 300);
    shell.open();
    shellGC = new GC(shell);
    shellBackground = shell.getBackground();

    FileDialog dialog = new FileDialog(shell);
    dialog.setFilterExtensions(new String[] {"*.gif"});
    String fileName = dialog.open();
    if (fileName != null) {
      loader = new ImageLoader();
      try {
        imageDataArray = loader.load(fileName);
        if (imageDataArray.length > 1) {
          animateThread = new Thread("Animation") {
            public void run() {
              /* Create an off-screen image to draw on, and fill it with the shell background. */
              Image offScreenImage = new Image(display, loader.logicalScreenWidth, loader.logicalScreenHeight);
              GC offScreenImageGC = new GC(offScreenImage);
              offScreenImageGC.setBackground(shellBackground);
              offScreenImageGC.fillRectangle(0, 0, loader.logicalScreenWidth, loader.logicalScreenHeight);
                
              try {
                /* Create the first image and draw it on the off-screen image. */
                int imageDataIndex = 0;  
                ImageData imageData = imageDataArray[imageDataIndex];
                if (image != null && !image.isDisposed()) image.dispose();
                image = new Image(display, imageData);
                offScreenImageGC.drawImage(
                  image,
                  0,
                  0,
                  imageData.width,
                  imageData.height,
                  imageData.x,
                  imageData.y,
                  imageData.width,
                  imageData.height);

                /* Now loop through the images, creating and drawing each one
                 * on the off-screen image before drawing it on the shell. */
                int repeatCount = loader.repeatCount;
                while (loader.repeatCount == 0 || repeatCount > 0) {
                  switch (imageData.disposalMethod) {
                  case SWT.DM_FILL_BACKGROUND:
                    /* Fill with the background color before drawing. */
                    Color bgColor = null;
                    if (useGIFBackground && loader.backgroundPixel != -1) {
                      bgColor = new Color(display, imageData.palette.getRGB(loader.backgroundPixel));
                    }
                    offScreenImageGC.setBackground(bgColor != null ? bgColor : shellBackground);
                    offScreenImageGC.fillRectangle(imageData.x, imageData.y, imageData.width, imageData.height);
                    if (bgColor != null) bgColor.dispose();
                    break;
                  case SWT.DM_FILL_PREVIOUS:
                    /* Restore the previous image before drawing. */
                    offScreenImageGC.drawImage(
                      image,
                      0,
                      0,
                      imageData.width,
                      imageData.height,
                      imageData.x,
                      imageData.y,
                      imageData.width,
                      imageData.height);
                    break;
                  }
                            
                  imageDataIndex = (imageDataIndex + 1) % imageDataArray.length;
                  imageData = imageDataArray[imageDataIndex];
                  image.dispose();
                  image = new Image(display, imageData);
                  offScreenImageGC.drawImage(
                    image,
                    0,
                    0,
                    imageData.width,
                    imageData.height,
                    imageData.x,
                    imageData.y,
                    imageData.width,
                    imageData.height);
                  
                  /* Draw the off-screen image to the shell. */
                  shellGC.drawImage(offScreenImage, 0, 0);
                  
                  /* Sleep for the specified delay time (adding commonly-used slow-down fudge factors). */
                  try {
                    int ms = imageData.delayTime * 10;
                    if (ms < 20) ms += 30;
                    if (ms < 30) ms += 10;
                    Thread.sleep(ms);
                  } catch (InterruptedException e) {
                  }
                  
                  /* If we have just drawn the last image, decrement the repeat count and start again. */
                  if (imageDataIndex == imageDataArray.length - 1) repeatCount--;
                }
              } catch (SWTException ex) {
                System.out.println("There was an error animating the GIF");
              } finally {
                if (offScreenImage != null && !offScreenImage.isDisposed()) offScreenImage.dispose();
                if (offScreenImageGC != null && !offScreenImageGC.isDisposed()) offScreenImageGC.dispose();
                if (image != null && !image.isDisposed()) image.dispose();
              }
            }
          };
          animateThread.setDaemon(true);
          animateThread.start();
        }
      } catch (SWTException ex) {
        System.out.println("There was an error loading the GIF");
      }
    }

    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) display.sleep();
    }
    display.dispose();
  }
}


           
       










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