seeddms-code/inc/inc.ClassConversionServicePdfToImage.php
2024-09-17 14:29:43 +02:00

102 lines
3.2 KiB
PHP

<?php
/**
* Implementation of conversion service pdf class
*
* @category DMS
* @package SeedDMS
* @license GPL 2
* @version @version@
* @author Uwe Steinmann <uwe@steinmann.cx>
* @copyright Copyright (C) 2021 Uwe Steinmann
* @version Release: @package_version@
*/
require_once("inc/inc.ClassConversionServiceBase.php");
/**
* Implementation of conversion service pdf class
*
* @category DMS
* @package SeedDMS
* @author Uwe Steinmann <uwe@steinmann.cx>
* @copyright Copyright (C) 2021 Uwe Steinmann
* @version Release: @package_version@
*/
class SeedDMS_ConversionServicePdfToImage extends SeedDMS_ConversionServiceBase {
/**
* timeout
*/
public $timeout;
public function __construct($from, $to) { /* {{{ */
parent::__construct();
$this->from = $from;
$this->to = $to;
$this->timeout = 5;
} /* }}} */
public function getInfo() { /* {{{ */
return "Convert with imagick php functions";
} /* }}} */
public function getAdditionalParams() { /* {{{ */
return [
['name'=>'width', 'type'=>'number', 'description'=>'Width of converted image'],
['name'=>'page', 'type'=>'number', 'description'=>'Page of Pdf document'],
];
} /* }}} */
public function convert($infile, $target = null, $params = array()) { /* {{{ */
$start = microtime(true);
$imagick = new Imagick();
/* Setting a smaller resolution will speed up the conversion
* A resolution of 72,72 will create a 596x842 image
* Setting it to 36,36 will create a 298x421 image which should
* be sufficient in most cases, but keep in mind that images are
* not scaled up. Hence, a width of 400px still results in a 298px
* wide image
*/
$imagick->setResolution(72,72);
$page = 0;
if(!empty($params['page']) && intval($params['page']) > 0)
$page = intval($params['page'])-1;
try {
if($imagick->readImage($infile.'['.$page.']')) {
if(!empty($params['width']))
$imagick->scaleImage(min((int) $params['width'], $imagick->getImageWidth()), 0);
/* Remove alpha channel and set to white */
$imagick->setImageBackgroundColor('white');
/* Setting the color-type and bit-depth produces much smaller images
* because the default depth appears to be 16 bit
*/
$imagick->setOption('png:color-type', 6);
$imagick->setOption('png:bit-depth', 8);
$imagick->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
$imagick->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
$imagick->setImageFormat('png');
$end = microtime(true);
if($this->logger) {
$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' with pdf service took '.($end-$start).' sec.', PEAR_LOG_INFO);
}
if($target) {
return $imagick->writeImage($target);
} else {
return $imagick->getImageBlob();
}
} else {
if($this->logger) {
$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' with pdf service failed: could not read input file.', PEAR_LOG_ERR);
}
}
} catch (ImagickException $e) {
if($this->logger) {
$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' with pdf service failed: '.$e->getMessage(), PEAR_LOG_ERR);
}
$this->success = false;
return false;
}
return false;
} /* }}} */
}