public function compare()
{
$blocksA = Block::chunkImage($this->imageA, $this->chunkSize);
$blocksB = Block::chunkImage($this->imageB, $this->chunkSize);
$sizeX = count($blocksA);
$sizeY = count($blocksA[0]);
$this->chunksQuantity = ["x" => $sizeX, "y" => $sizeY];
$diff = 0;
for ($x = 0; $x < $sizeX; ++$x) {
for ($y = 0; $y < $sizeY; ++$y) {
$diff += $this->compareBlock($blocksA[$x][$y], $blocksB[$x][$y]);
if ($this->wasCompared) {
return;
}
}
}
$this->computeResult($diff);
}
protected function compareGreyBlock(Block $_a, Block $_b)
{
$colorA = $_a->getAverageColor();
$colorB = $_b->getAverageColor();
return $_a->getSize() * abs($colorA->getGrey() - $colorB->getGrey());
}
