/**
* Create possibly volatile scratch image for fast painting. A scratch image can become
* invalidated, when this happens any actions involving it are ignored, and it needs to be
* recreated. Use isScratchImageValid() to check this.
*/
public static Image createScratchImage(int width, int height) {
try {
Image img =
(Image)
tryMethod(
output_comp,
"createVolatileImage",
new Object[] {new Integer(width), new Integer(height)});
if (img == null) {
// no such method -> create regular image
return output_comp.createImage(width, height);
}
// if (img.validate(output_comp.getGraphicsConfiguration())
// == VolatileImage.IMAGE_INCOMPATIBLE) {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
Integer valid = (Integer) tryMethod(img, "validate", new Object[] {gc});
// output_comp.getGraphicsConfiguration() });
if (valid.intValue() == 2) { // I checked, IMAGE_INCOMPATIBLE=2
// Hmm, somehow it didn't work. Create regular image.
return output_comp.createImage(width, height);
}
return img;
} catch (java.security.AccessControlException e) {
// we're not allowed to do this (we're probably an applet)
return output_comp.createImage(width, height);
}
}
/**
* Creates a device compatible BufferedImage
*
* @param width the width in pixels
* @param height the height in pixels
*/
public static BufferedImage getDeviceCompatibleImage(int width, int height) {
GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice screenDevice = graphicsEnvironment.getDefaultScreenDevice();
GraphicsConfiguration graphicConfiguration = screenDevice.getDefaultConfiguration();
BufferedImage image = graphicConfiguration.createCompatibleImage(width, height);
return image;
}
/** Create empty image with given alpha mode that should be efficient on this display */
public static BufferedImage createCompatibleImage(int width, int height, int transparency) {
// try {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
// always use bitmask transparency
BufferedImage bimage = gc.createCompatibleImage(width, height, transparency);
return bimage;
// } catch (HeadlessException e) { // this exception is not in 1.2
// The system does not have a screen
// e.printStackTrace();
// return null;
// }
}
// This method returns a buffered image with the contents of an image
// Source: http://www.exampledepot.com/egs/java.awt.image/Image2Buf.html
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 Determining If an Image Has Transparent Pixels
boolean hasAlpha = hasAlpha(image);
// 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 GraphicsConfiguration getDeviceConfiguration() {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
return (gd.getDefaultConfiguration());
}
