/**
* Get the composited canvas.
*
*/
public function getCompositeCanvas()
{
// Create our target canvas
$canvas = new Canvas($this->width, $this->height, 0x0);
$crect = $canvas->getRect();
// Precalculate some stuff for performance
$samesize = [];
foreach ($this->layers as $i => $layer) {
$samesize[$i] = $layer->position == $layer->canvas->getRect();
}
// Process the composite canvas
for ($n = 0; $n < $this->width; $n++) {
for ($m = 0; $m < $this->height; $m++) {
if ($this->background) {
$co = $this->background->getPixel($n, $m);
} else {
$co = 0x0;
}
foreach ($this->layers as $i => $layer) {
//printf("Pre [%d] (mode=%d): 0x%06x ", $i, $layer->blend, $co);
if ($layer->position->isXYWithin($n, $m)) {
$co = $this->blend($co, $layer->canvas->getPixel($n, $m), $layer->blend, $layer->opacity);
}
//printf("Post: 0x%06x\n", $co);
}
$canvas->setPixel($n, $m, $co);
}
}
return $canvas;
}
