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* $RCSfile: ImageHelper.java,v $
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package convwatch;
import java.awt.Image;
import java.awt.image.PixelGrabber;
import java.awt.image.ImageObserver;
import java.io.File;
//import javax.imageio.ImageIO;
import java.io.IOException;
import java.lang.reflect.Method;
class ImageHelper
{
Image m_aImage;
int[] m_aPixels;
int m_w = 0;
int m_h = 0;
boolean m_bGrabbed = false;
public ImageHelper(Image _aImage)
{
m_aImage = _aImage;
// grab all (consume much memory)
m_w = getWidth();
m_h = getHeight();
int x = 0;
int y = 0;
m_aPixels = new int[m_w * m_h];
PixelGrabber pg = new PixelGrabber(m_aImage, x, y, m_w, m_h, m_aPixels, 0, m_w);
try {
pg.grabPixels();
} catch (InterruptedException e) {
System.err.println("interrupted waiting for pixels!");
return;
}
if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
System.err.println("image fetch aborted or errored");
return;
}
m_bGrabbed = true;
}
public int getWidth() {return m_aImage.getWidth(null);}
public int getHeight() {return m_aImage.getHeight(null);}
// direct access to a pixel
public int getPixel(int x, int y)
{
return m_aPixels[y * m_w + x];
}
// Write down the current image to a file.
// public void storeImage(String _sFilename)
// {
// }
public static ImageHelper createImageHelper(String _sFilename)
throws java.io.IOException
{
Image aImage = null;
File aFile = new File(_sFilename);
Exception ex = null;
try {
Class imageIOClass = Class.forName("javax.imageio.ImageIO");
Method readMethod = imageIOClass.getDeclaredMethod("read", new Class[]{java.io.File.class});
Object retValue = readMethod.invoke(imageIOClass, new Object[]{aFile});
aImage = (Image)retValue;
}
catch(java.lang.ClassNotFoundException e) {
ex = e;
}
catch(java.lang.NoSuchMethodException e) {
ex = e;
}
catch(java.lang.IllegalAccessException e) {
ex = e;
}
catch(java.lang.reflect.InvocationTargetException e) {
ex = e;
}
if (ex != null) {
// get Java version:
String javaVersion = System.getProperty("java.version");
throw new java.io.IOException(
"Cannot construct object with current Java version " +
javaVersion + ": " + ex.getMessage());
}
// aImage = ImageIO.read(aFile);
return new ImageHelper(aImage);
}
}