public function processOperations(Image $input_image, Image $output_image = null)
{
$command_line = $this->getImageMagickConvert();
$this->temp_input_filename = $this->getTempFilename('input_');
file_put_contents($this->temp_input_filename, $input_image->getImageData());
// Check for a SequenceNumber or Density operation. They're a little special.
foreach ($this->operations as $index => $operation) {
if ($operation instanceof SequenceNumber) {
$frame = (int) $operation->getValue();
if (!$frame) {
throw new ImageMagickException('Frame was not an integer');
}
$this->temp_input_filename .= '[' . $frame . ']';
unset($this->operations[$index]);
}
if ($operation instanceof Density) {
$density = (int) $operation->getValue();
if (!$density) {
throw new ImageMagickException('Density was not an integer');
}
$command_line .= ' -density ' . $density;
unset($this->operations[$index]);
}
}
$command_line .= ' ' . escapeshellarg($this->temp_input_filename) . ' ';
foreach ($this->operations as $operation) {
if ($operation instanceof InstantOperation) {
return $operation->process($input_image, $command_line);
}
$command_line = $operation->process($input_image, $command_line)->getCommandLine() . ' ';
}
$temp_output_filename = '';
if ($output_image) {
$temp_output_filename = $this->getTempFilename('output_');
$command_line .= $this->getOutputFileWithFormat($temp_output_filename);
}
// Remove extra whitespace between operations
$command_line = preg_replace('/\\s+/', ' ', $command_line);
// Check for a no-op. Don't lose fidelity by converting it to itself
// Also check to make sure it hasn't been forced. We assume that the Convert operation wouldn't set the format if it didn't have to.
if (!$this->output_format_is_forced && trim($command_line) == $this->getImageMagickConvert() . ' ' . escapeshellarg($this->temp_input_filename) . ' ' . $this->getOutputFileWithFormat($temp_output_filename)) {
copy($this->temp_input_filename, $temp_output_filename);
$output = array('No-op; Copied image');
$status = 0;
} else {
exec($command_line, $output, $status);
}
if ($status) {
throw new ImageMagickException('Error executing ImageMagick: ' . $status);
}
if ($output_image && $this->temp_input_filename) {
$output_image->setImageData(file_get_contents($temp_output_filename));
}
return implode("\n", $output);
}
