101 lines
2.8 KiB
PHP
101 lines
2.8 KiB
PHP
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<?php
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namespace Kirby\Plugins\ImageKit\Optimizer;
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/**
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* Uses `mozjpeg` for encoding JPEG files. This often creates
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* much smaller JPEG files than most other encoders at a
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* comparable quality.
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*
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* See: https://github.com/mozilla/mozjpeg
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*/
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class MozJPEG extends Base {
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public static $selector = ['image/jpeg'];
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public $priority = [100, 5];
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protected $targetFile;
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protected $tmpFile;
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public static function defaults() {
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return [
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'imagekit.mozjpeg.bin' => null,
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'imagekit.mozjpeg.quality' => 85,
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'imagekit.mozjpeg.flags' => '',
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];
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}
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public static function available() {
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return !empty(static::$kirby->option('imagekit.mozjpeg.bin'));
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}
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public function pre() {
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$this->targetFile = $this->thumb->destination->root;
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if($this->isDriver('im')) {
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// Instruct imagemagick driver to write out a temporary,
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// uncrompressed TGA file, so our JPEG will not be
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// compressed twice. I played around with PNM too,
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// because it’s much faster as an intermediate format,
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// but some images got corrupted by mozjpeg.
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$this->tmpFile = $this->getTemporaryFilename('tga');
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$this->thumb->destination->root = $this->tmpFile;
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} else {
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// If GD driver (or an unknown driver) is active, we
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// need to encode twice, because SimpleImage can only
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// save to JPEG, PNG or GIF. As saving a 24-bit
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// lossless PNG as an intermediate step is too
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// expensive for large images, we need to encode
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// as JPEG :-(
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// This also needs a temporary file, because it seems
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// that mozjpeg cannot overwrite the it’s file.
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$this->tmpFile = $this->getTemporaryFilename();
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$this->thumb->destination->root = $this->tmpFile;
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$this->thumb->options['quality'] = 99;
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}
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}
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public function post() {
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$command = [];
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$command[] = static::$kirby->option('imagekit.mozjpeg.bin');
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// Quality
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$command[] = '-quality ' . $this->option('imagekit.mozjpeg.quality');
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// Interlace
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if($this->thumb->options['interlace']) {
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$command[] = '-progressive';
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}
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// Grayscale
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if($this->thumb->options['grayscale']) {
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$command[] = '-grayscale';
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}
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// Set output file.
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$command[] = '-outfile "' . $this->targetFile . '"';
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$flags = $this->option('imagekit.mozjpeg.flags');
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if(!empty($flags)) {
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// Add exra flags, if defined by user.
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$command[] = $flags;
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}
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// Use tmp file as input.
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$command[] = '"' . $this->tmpFile . '"';
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exec(implode(' ', $command));
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// Delete temporary file and restore destination path
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// on thumb object. This only needs to be done, if
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// ImageMagick driver is used and the input file was
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// in PNM format.
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@unlink($this->tmpFile);
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$this->thumb->destination->root = $this->targetFile;
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}
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}
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