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<?php |
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namespace WebPConvert\Convert\Helpers; |
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/** |
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* Try to detect quality of a jpeg image using various tools. |
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* |
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* @package WebPConvert |
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* @author Bjørn Rosell <[email protected]> |
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* @since Class available since Release 2.0.0 |
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*/ |
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class JpegQualityDetector |
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{ |
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/** |
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* Try to detect quality of jpeg using imagick extension |
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* |
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* @param string $filename A complete file path to file to be examined |
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* @return int|null Quality, or null if it was not possible to detect quality |
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*/ |
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private static function detectQualityOfJpgUsingImagickExtension($filename) |
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{ |
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if (extension_loaded('imagick') && class_exists('\\Imagick')) { |
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try { |
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$img = new \Imagick($filename); |
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// The required function is available as from PECL imagick v2.2.2 |
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if (method_exists($img, 'getImageCompressionQuality')) { |
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return $img->getImageCompressionQuality(); |
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} |
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} catch (\Exception $e) { |
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// Well well, it just didn't work out. |
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// - But perhaps next method will work... |
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} |
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} |
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return null; |
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} |
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/** |
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* Try to detect quality of jpeg using imagick binary |
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* |
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* @param string $filename A complete file path to file to be examined |
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* @return int|null Quality, or null if it was not possible to detect quality |
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*/ |
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private static function detectQualityOfJpgUsingImagickBinary($filename) |
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{ |
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if (function_exists('exec')) { |
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// Try Imagick using exec, and routing stderr to stdout (the "2>$1" magic) |
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exec("identify -format '%Q' " . escapeshellarg($filename) . " 2>&1", $output, $returnCode); |
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//echo 'out:' . print_r($output, true); |
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if ((intval($returnCode) == 0) && (is_array($output)) && (count($output) == 1)) { |
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return intval($output[0]); |
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} |
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} |
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return null; |
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} |
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/** |
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* Try to detect quality of jpeg using gmagick binary |
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* |
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* @param string $filename A complete file path to file to be examined |
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* @return int|null Quality, or null if it was not possible to detect quality |
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*/ |
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private static function detectQualityOfJpgUsingGmagickBinary($filename) |
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{ |
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if (function_exists('exec')) { |
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// Try GraphicsMagick |
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exec("gm identify -format '%Q' " . escapeshellarg($filename) . " 2>&1", $output, $returnCode); |
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if ((intval($returnCode) == 0) && (is_array($output)) && (count($output) == 1)) { |
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return intval($output[0]); |
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} |
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} |
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return null; |
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} |
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/** |
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* Try to detect quality of jpeg. |
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* |
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* Note: This method does not throw errors, but might dispatch warnings. |
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* You can use the WarningsIntoExceptions class if it is critical to you that nothing gets "printed" |
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* |
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* @param string $filename A complete file path to file to be examined |
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* @return int|null Quality, or null if it was not possible to detect quality |
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*/ |
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public static function detectQualityOfJpg($filename) |
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{ |
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//trigger_error('warning test', E_USER_WARNING); |
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// Test that file exists in order not to break things. |
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if (!file_exists($filename)) { |
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// One could argue that it would be better to throw an Exception...? |
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return null; |
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} |
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// Try Imagick extension, if available |
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$quality = self::detectQualityOfJpgUsingImagickExtension($filename); |
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if (is_null($quality)) { |
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$quality = self::detectQualityOfJpgUsingImagickBinary($filename); |
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} |
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if (is_null($quality)) { |
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$quality = self::detectQualityOfJpgUsingGmagickBinary($filename); |
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} |
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return $quality; |
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} |
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} |
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rosell-dk /
webp-convert
