| public static org.eclipse.swt.graphics.Image | renderTransparency(org.eclipse.swt.widgets.Display display, org.eclipse.swt.graphics.Image background, org.eclipse.swt.graphics.Image foreground)
//Checks
if( display == null || display.isDisposed() ||
background == null || background.isDisposed() ||
foreground == null || foreground.isDisposed()
) return null;
Rectangle r1 = background.getBounds();
Rectangle r2 = foreground.getBounds();
if(! r1.equals(r2)) return null;
Image image = new Image(display,r1);
ImageData backData = background.getImageData();
ImageData foreData = foreground.getImageData();
ImageData imgData = image.getImageData();
for(int y = 0 ; y < foreData.height ; y++) {
for(int x = 0 ; x < foreData.width ; x++) {
int cBack = backData.getPixel(x,y);
int cFore = foreData.getPixel(x,y);
int aFore = foreData.getAlpha(x,y);
int rBack = cBack & 0xFF;
int gBack = (cBack >> 8) & 0xFF;
int bBack = (cBack >> 16) & 0xFF;
int rFore = cFore & 0xFF;
int gFore = (cFore >> 8) & 0xFF;
int bFore = (cFore >> 16) & 0xFF;
int r = (rBack * aFore + (255 - aFore) * rFore) / 255;
r = r & 0xFF;
int g = (gBack * aFore + (255 - aFore) * gFore) / 255;
g = g & 0xFF;
int b = (bBack * aFore + (255 - aFore) * bFore) / 255;
b = b & 0xFF;
int color = r + g << 8 + b << 16;
imgData.setPixel(x,y,color);
}
}
return image;
|
