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<?php |
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namespace WebPConvert\Convert\Converters\BaseTraits; |
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use WebPConvert\Convert\Helpers\JpegQualityDetector; |
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/** |
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* Trait for handling the "quality:auto" option. |
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* |
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* This trait is only used in the AbstractConverter class. It has been extracted into a |
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* trait in order to bundle the methods concerning auto quality. |
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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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trait AutoQualityTrait |
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{ |
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/** @var boolean Whether the quality option has been processed or not */ |
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private $processed = false; |
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/** @var boolean Whether the quality of the source could be detected or not (set upon processing) */ |
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private $qualityCouldNotBeDetected = false; |
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/** @var integer The calculated quality (set upon processing - on successful detection) */ |
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private $calculatedQuality; |
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abstract public function getMimeTypeOfSource(); |
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abstract public function logLn($msg, $style = ''); |
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/** |
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* Determine if quality detection is required but failing. |
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* |
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* It is considered "required" when: |
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* - Mime type is "image/jpeg" |
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* - Quality is set to "auto" |
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* |
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* If quality option hasn't been proccessed yet, it is triggered. |
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* |
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* @return boolean |
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*/ |
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public function isQualityDetectionRequiredButFailing() |
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{ |
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$this->processQualityOptionIfNotAlready(); |
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return $this->qualityCouldNotBeDetected; |
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} |
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/** |
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* Get calculated quality. |
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* |
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* If the "quality" option is a number, that number is returned. |
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* If mime type of source is something else than "image/jpeg", the "default-quality" option is returned |
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* If quality is "auto" and source is a jpeg image, it will be attempted to detect jpeg quality. |
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* In case of failure, the value of the "default-quality" option is returned. |
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* In case of success, the detected quality is returned, or the value of the "max-quality" if that is lower. |
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* |
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* @return int |
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*/ |
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public function getCalculatedQuality() |
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{ |
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$this->processQualityOptionIfNotAlready(); |
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return $this->calculatedQuality; |
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} |
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/** |
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* Process the quality option if it is not already processed. |
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* |
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* @return void |
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*/ |
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private function processQualityOptionIfNotAlready() |
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{ |
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if (!$this->processed) { |
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$this->processed = true; |
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$this->processQualityOption(); |
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} |
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} |
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/** |
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* Process the quality option. |
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* |
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* Sets the private property "calculatedQuality" according to the description for the getCalculatedQuality |
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* function. |
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* In case quality detection was attempted and failed, the private property "qualityCouldNotBeDetected" is set |
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* to true. This is used by the "isQualityDetectionRequiredButFailing" (and documented there too). |
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* |
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* @return void |
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*/ |
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private function processQualityOption() |
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{ |
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$options = $this->options; |
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$source = $this->source; |
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$q = $options['quality']; |
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if ($q == 'auto') { |
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if (($this->getMimeTypeOfSource() == 'image/jpeg')) { |
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$q = JpegQualityDetector::detectQualityOfJpg($source); |
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if (is_null($q)) { |
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$q = $options['default-quality']; |
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$this->logLn( |
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'Quality of source could not be established (Imagick or GraphicsMagick is required)' . |
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' - Using default instead (' . $options['default-quality'] . ').' |
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); |
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$this->qualityCouldNotBeDetected = true; |
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} else { |
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if ($q > $options['max-quality']) { |
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$this->logLn( |
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'Quality of source is ' . $q . '. ' . |
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'This is higher than max-quality, so using max-quality instead (' . |
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$options['max-quality'] . ')' |
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); |
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} else { |
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$this->logLn('Quality set to same as source: ' . $q); |
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} |
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} |
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$q = min($q, $options['max-quality']); |
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} else { |
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//$q = $options['default-quality']; |
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$q = min($options['default-quality'], $options['max-quality']); |
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$this->logLn('Quality: ' . $q . '. '); |
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} |
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} else { |
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$this->logLn( |
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'Quality: ' . $q . '. ' |
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); |
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if (($this->getMimeTypeOfSource() == 'image/jpeg')) { |
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$this->logLn( |
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'Consider setting quality to "auto" instead. It is generally a better idea' |
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); |
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} |
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} |
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$this->calculatedQuality = $q; |
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} |
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} |
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rosell-dk /
webp-convert
