public void backgroundImpl() {
if (backgroundAlpha) {
// Create a small array that can be used to set the pixels several times.
// Using a single-pixel line of length 'width' is a tradeoff between
// speed (setting each pixel individually is too slow) and memory
// (an array for width*height would waste lots of memory if it stayed
// resident, and would terrify the gc if it were re-created on each trip
// to background().
WritableRaster raster = ((BufferedImage) image).getRaster();
if ((clearPixels == null) || (clearPixels.length < width)) {
clearPixels = new int[width];
}
java.util.Arrays.fill(clearPixels, backgroundColor);
for (int i = 0; i < height; i++) {
raster.setDataElements(0, i, width, 1, clearPixels);
}
} else {
// new Exception().printStackTrace(System.out);
// in case people do transformations before background(),
// need to handle this with a push/reset/pop
pushMatrix();
resetMatrix();
g2.setColor(new Color(backgroundColor)); // , backgroundAlpha));
g2.fillRect(0, 0, width, height);
popMatrix();
}
}
