private boolean spanEmpty(Image source) {
boolean spanEmpty = true;
while (source.hasNext())
if (source.next() != empty) {
spanEmpty = false;
break;
}
return spanEmpty;
}
public Image shrink(Image source) {
int originX;
int originY;
for (originX = 0; originX < source.getWidth(); originX++) {
source.iterateV(originX);
if (!spanEmpty(source)) break;
}
for (originY = 0; originY < source.getHeight(); originY++) {
source.iterateH(originY);
if (!spanEmpty(source)) break;
}
int borderX;
for (borderX = source.getWidth() - 1; borderX > originX; borderX--) {
source.iterateV(borderX);
if (!spanEmpty(source)) break;
}
int borderY;
for (borderY = source.getHeight() - 1; borderY > originY; borderY--) {
source.iterateH(borderY);
if (!spanEmpty(source)) break;
}
return source.chisel(originX, originY, borderX + 1 - originX, borderY + 1 - originY);
}