/**
* @param $file
* @param $commad_prefix
*
* @throws Exception
*/
private function _optimize_png($file, $commad_prefix)
{
//pngquant lossy compresssion
if ($this->mode == self::MODE_LOSSY) {
$pngquant = self::_find_tool('pngquant');
$min_quality = 50;
$max_quality = max($min_quality, $this->lossy_quality);
$levels = array(self::LEVEL_FAST => 10, self::LEVEL_NORMAL => 3, self::LEVEL_HIGH => 1, self::LEVEL_EXTREME => 1);
//compress using a temp file because pngquant dont allow direct writing of input file
$i = 0;
do {
$tmp = sys_get_temp_dir() . '/pngquant_' . $i . '.png';
$i++;
} while (file_exists($tmp));
copy($file, $tmp);
$this->_exec("{$commad_prefix}{$pngquant} --speed {$levels[$this->level]} --quality={$min_quality}-{$max_quality} --ext _pq.png :file", array(':file' => $tmp));
$out = preg_replace('/\\.png$/', '_pq.png', $tmp);
if (file_exists($out)) {
if (!$this->check_output || Tinyfier_Image_Tool::is_valid_image($out)) {
rename($out, $file);
} else {
if ($this->verbose) {
echo "<h5>Ignored invalid image '{$out}' generated by pngquant</h5>";
}
unlink($out);
}
}
if (file_exists($tmp)) {
unlink($tmp);
}
}
if ($this->check_lossless_output) {
$original_image = new Tinyfier_Image_Tool($file);
}
//Optipng Lossless compression
$optipng = self::_find_tool('optipng');
$metadata_copy = $this->remove_metadata ? '-strip all' : '';
$levels = array(self::LEVEL_FAST => 2, self::LEVEL_NORMAL => 3, self::LEVEL_HIGH => 4, self::LEVEL_EXTREME => 6);
$this->_exec("{$commad_prefix}{$optipng} -o{$levels[$this->level]} -quiet {$metadata_copy} :file", array(':file' => $file));
//Pngout Lossless compression
$pngout = self::_find_tool('pngout');
$levels = array(self::LEVEL_FAST => 3, self::LEVEL_NORMAL => 2, self::LEVEL_HIGH => 1, self::LEVEL_EXTREME => 0);
$this->_exec("{$commad_prefix}{$pngout} -s{$levels[$this->level]} -q :file", array(':file' => $file));
if (isset($original_image) && !Tinyfier_Image_Tool::equal($original_image, $file)) {
throw new Exception('Lossless compression output was different to original');
}
return true;
}
/**
* Apply a filter on the selected image
* @see http://php.net/manual/function.imagefilter.php
*/
public function lib_resize($arg)
{
//Get parameters
$url = $this->_remove_quotes(trim($arg[2][0][2][0]));
$width = $this->_remove_quotes(trim($arg[2][1][1]));
$width_unit = trim($arg[2][1][2]);
$height = isset($arg[2][2]) ? $this->_remove_quotes(trim($arg[2][2][1])) : null;
$height_unit = isset($arg[2][2]) ? trim($arg[2][2][2]) : 'px';
$keep_aspect = isset($arg[2][3]) ? $this->_remove_quotes(trim($arg[2][3][1])) : true;
if (strtolower($keep_aspect) == 'false') {
$keep_aspect = false;
}
//Find local file
$local_path = $this->_local_path($url);
//Apply filter
$image = new Tinyfier_Image_Tool($local_path);
if ($width_unit == '%') {
$width = round($image->width() * ($width / 100.0));
}
if ($height_unit == '%') {
$height = round($image->height() * ($height / 100.0));
}
if ($width == $image->width() && $height == $image->height()) {
return array('string', '', array("url('{$url}')"));
}
$image->resize($width, $height, $keep_aspect);
//Save image and generate CSS
$format = in_array($image->format(), array('gif', 'png', 'jpg')) ? $image->format() : 'png';
$path = $this->_get_cache_path('resize', $format);
$image->save($path, $this->_settings['lossy_quality'], $this->_settings['optimize_images']);
return array('string', '', array("url('{$this->_get_cache_url($path)}')"));
}