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<?php |
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namespace WebPConvert\Convert\Converters; |
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use WebPConvert\Convert\Converters\AbstractConverter; |
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use WebPConvert\Convert\Converters\ConverterTraits\LosslessAutoTrait; |
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use WebPConvert\Convert\Exceptions\ConversionFailedException; |
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use WebPConvert\Convert\Exceptions\ConversionFailed\ConverterNotOperational\SystemRequirementsNotMetException; |
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//require '/home/rosell/.composer/vendor/autoload.php'; |
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/** |
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* Convert images to webp using Vips extension. |
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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 Vips extends AbstractConverter |
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{ |
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use LosslessAutoTrait; |
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/* |
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public function supportsLossless() |
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{ |
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return true; |
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} |
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*/ |
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protected function getOptionDefinitionsExtra() |
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{ |
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return [ |
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['smart-subsample', 'boolean', false], |
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]; |
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} |
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/** |
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* Check operationality of Vips converter. |
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* |
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* @throws SystemRequirementsNotMetException if system requirements are not met |
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*/ |
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public function checkOperationality() |
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{ |
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if (!extension_loaded('vips')) { |
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throw new SystemRequirementsNotMetException('Required Vips extension is not available.'); |
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} |
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if (!function_exists('vips_image_new_from_file')) { |
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throw new SystemRequirementsNotMetException( |
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'Vips extension seems to be installed, however something is not right: ' . |
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'the function "vips_image_new_from_file" is not available.' |
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); |
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} |
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// TODO: Should we also test if webp is available? (It seems not to be neccessary - it seems |
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// that webp be well intergrated part of vips) |
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} |
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/** |
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* Check if specific file is convertable with current converter / converter settings. |
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* |
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* @throws SystemRequirementsNotMetException if Vips does not support image type |
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*/ |
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public function checkConvertability() |
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{ |
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// It seems that png and jpeg are always supported by Vips |
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// - so nothing needs to be done here |
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if (function_exists('vips_version')) { |
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$this->logLn('vipslib version: ' . vips_version()); |
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} |
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$this->logLn('vips extension version: ' . phpversion('vips')); |
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} |
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/** |
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* Create vips image resource from source file |
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* |
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* @throws ConversionFailedException if image resource cannot be created |
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* @return resource vips image resource |
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*/ |
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private function createImageResource() |
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{ |
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// We are currently using vips_image_new_from_file(), but we could consider |
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// calling vips_jpegload / vips_pngload instead |
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$result = /** @scrutinizer ignore-call */ vips_image_new_from_file($this->source, []); |
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if ($result === -1) { |
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/*throw new ConversionFailedException( |
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'Failed creating new vips image from file: ' . $this->source |
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);*/ |
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$message = /** @scrutinizer ignore-call */ vips_error_buffer(); |
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throw new ConversionFailedException($message); |
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} |
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if (!is_array($result)) { |
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throw new ConversionFailedException( |
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'vips_image_new_from_file did not return an array, which we expected' |
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); |
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} |
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if (count($result) != 1) { |
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throw new ConversionFailedException( |
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'vips_image_new_from_file did not return an array of length 1 as we expected ' . |
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'- length was: ' . count($result) |
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); |
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} |
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$im = array_shift($result); |
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return $im; |
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} |
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/** |
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* Create parameters for webpsave |
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* |
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* @return array the parameters as an array |
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*/ |
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private function createParamsForVipsWebPSave() |
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{ |
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// webpsave options are described here: |
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// https://jcupitt.github.io/libvips/API/current/VipsForeignSave.html#vips-webpsave |
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$options = [ |
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"Q" => $this->getCalculatedQuality(), |
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'lossless' => $this->options['lossless'], |
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'strip' => $this->options['metadata'] == 'none', |
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]; |
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// Only set the following options if they differ from the default of vipslib |
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// This ensures we do not get warning if that property isn't supported |
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if ($this->options['smart-subsample'] !== false) { |
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$options['smart_subsample'] = $this->options['smart-subsample']; |
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} |
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if ($this->options['alpha-quality'] !== 100) { |
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$options['alpha_q'] = $this->options['alpha-quality']; |
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} |
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if (!is_null($this->options['preset'])) { |
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// preset. 0:default, 1:picture, 2:photo, 3:drawing, 4:icon, 5:text, 6:last |
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$options['preset'] = array_search( |
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$this->options['preset'], |
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['default', 'picture', 'photo', 'drawing', 'icon', 'text'] |
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); |
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} |
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if ($this->options['near-lossless'] !== 100) { |
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if ($options['lossless'] === true) { |
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// We only let near_lossless have effect when lossless is set. |
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// otherwise lossless auto would not work as expected |
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$options['near_lossless'] = true; |
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// In Vips, the near-lossless value is controlled by Q. |
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// this differs from how it is done in cwebp, where it is an integer. |
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// We have chosen same option syntax as cwebp |
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$options['Q'] = $this->options['near-lossless']; |
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} |
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} |
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return $options; |
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} |
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/** |
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* Convert with vips extension. |
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* |
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* Tries to create image resource and save it as webp using the calculated options. |
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* Vips fails when a parameter is not supported, but we detect this and unset that parameter and try again |
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* (recursively call itself until there is no more of these kind of errors). |
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* |
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* @param resource $im A vips image resource to save |
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* @throws ConversionFailedException if conversion fails. |
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*/ |
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private function webpsave($im, $options) |
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{ |
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$result = /** @scrutinizer ignore-call */ vips_call('webpsave', $im, $this->destination, $options); |
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if ($result === -1) { |
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$message = /** @scrutinizer ignore-call */ vips_error_buffer(); |
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// If the error |
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if (preg_match("#no property named .(.*).#", $message, $matches)) { |
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$nameOfPropertyNotFound = $matches[1]; |
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$this->logLn( |
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'Your version of vipslib does not support the "' . $nameOfPropertyNotFound . '" property. ' . |
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'The option is ignored.' |
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); |
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unset($options[$nameOfPropertyNotFound]); |
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$this->webpsave($im, $options); |
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} else { |
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throw new ConversionFailedException($message); |
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} |
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} |
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1 |
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} |
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/** |
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* Convert with vips extension. |
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* |
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* Tries to create image resource and save it as webp using the calculated options. |
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* Vips fails when a parameter is not supported, but we detect this and unset that parameter and try again |
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* (repeat until success). |
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* |
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* @throws ConversionFailedException if conversion fails. |
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*/ |
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protected function doActualConvert() |
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{ |
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/* |
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$im = \Jcupitt\Vips\Image::newFromFile($this->source); |
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//$im->writeToFile(__DIR__ . '/images/small-vips.webp', ["Q" => 10]); |
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$im->webpsave($this->destination, [ |
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"Q" => 80, |
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//'near_lossless' => true |
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]); |
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return;*/ |
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$im = $this->createImageResource(); |
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$options = $this->createParamsForVipsWebPSave(); |
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$this->webpsave($im, $options); |
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} |
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} |
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rosell-dk /
webp-convert
