public function process(Image $image, $command_line = '')
{
if (!$this->compare_to) {
throw new ImageMagickException('No image to compare to!');
}
$output_file = $this->processor->getTempFilename('output_');
$left_file = $this->processor->getTempFilename('left_');
$right_file = $this->processor->getTempFilename('right_');
if ($this->use_current) {
$status = 0;
$output = array();
// Use the current queue, not the given file.
exec($command_line . ' ' . $left_file, $output, $status);
if ($status) {
throw new ImageMagickException('Could not compare images: ' . implode("\n", $output));
}
} else {
file_put_contents($left_file, $image->getImageData());
}
file_put_contents($right_file, $this->compare_to->getImageData());
$status = 0;
$output = array();
exec($this->processor->getImageMagickPath() . DIRECTORY_SEPARATOR . 'compare -metric PSNR ' . escapeshellarg($left_file) . ' ' . escapeshellarg($right_file) . ' ' . ' -quality 100 ' . escapeshellarg($output_file) . ' 2>&1', $output, $status);
if ($status == 1 && $this->processor->hasImageMagickQuirk(Processor::QUIRK_RESULT_IS_ONE_WHEN_COMPARE_FAILS)) {
// $status > 1 means something else failed. 1 means the images weren't exactly the same.
$status = 0;
}
if ($status == 0) {
if (stripos($output[0], 'inf') !== false) {
// IM sometimes returns 1.#INF instead of "inf". Normalize it to what we expect.
$output[0] = 'inf';
}
}
if ($status) {
throw new ImageMagickException('Could not compare images: (' . $status . ') ' . implode("\n", $output));
}
$result = new Result();
$result->setCommandLine($command_line);
if (!$status) {
$result->setImage(new File($output_file))->setExtra(implode(PHP_EOL, $output));
}
return $result;
}
