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add conversion service from text to image

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Uwe Steinmann 2023-01-04 14:30:45 +01:00
parent 0b94308831
commit dbe7f36eb0
2 changed files with 144 additions and 0 deletions
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inc/inc.ClassConversionMgr.php
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@ -16,6 +16,7 @@ require_once("inc/inc.ClassConversionServiceImageToImage.php");
require_once("inc/inc.ClassConversionServiceImageToText.php");
require_once("inc/inc.ClassConversionServicePdfToImage.php");
require_once("inc/inc.ClassConversionServiceTextToText.php");
require_once("inc/inc.ClassConversionServiceTextToImage.php");
/**
* Implementation of conversion manager

143
inc/inc.ClassConversionServiceTextToImage.php Normal file
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@ -0,0 +1,143 @@
<?php
/**
* Implementation of conversion service class
*
* @category DMS
* @package SeedDMS
* @license GPL 2
* @version @version@
* @author Uwe Steinmann <uwe@steinmann.cx>
* @copyright Copyright (C) 2023 Uwe Steinmann
* @version Release: @package_version@
*/
require_once("inc/inc.ClassConversionServiceBase.php");
/**
* Implementation of conversion service from text to image
*
* @category DMS
* @package SeedDMS
* @author Uwe Steinmann <uwe@steinmann.cx>
* @copyright Copyright (C) 2023 Uwe Steinmann
* @version Release: @package_version@
*/
class SeedDMS_ConversionServiceTextToImage extends SeedDMS_ConversionServiceBase {
public function __construct($from, $to) {
$this->from = $from;
$this->to = $to;
}
public function getInfo() {
return "Convert with imagick php functions";
}
public function getAdditionalParams() { /* {{{ */
return [
['name'=>'width', 'type'=>'number', 'description'=>'Width of converted image'],
['name'=>'page', 'type'=>'number', 'description'=>'Page of text document'],
];
} /* }}} */
private function wordWrapAnnotation($image, $draw, $text, $maxWidth) { /* {{{ */
$words = preg_split('%\s%', trim($text), -1, PREG_SPLIT_NO_EMPTY);
$lines = array();
$i = 0;
$lineHeight = 0;
while (count($words) > 0) {
$metrics = $image->queryFontMetrics($draw, implode(' ', array_slice($words, 0, ++$i)));
$lineHeight = max($metrics['textHeight'], $lineHeight);
// check if we have found the word that exceeds the line width
if ($metrics['textWidth'] > $maxWidth or count($words) < $i) {
// handle case where a single word is longer than the allowed line width (just add this as a word on its own line?)
if ($i == 1)
$i++;
$lines[] = implode(' ', array_slice($words, 0, --$i));
$words = array_slice($words, $i);
$i = 0;
}
}
return array($lines, $lineHeight);
} /* }}} */
public function convert($infile, $target = null, $params = array()) { /* {{{ */
$boxWidth = 596;
$boxHeight = 842;
$boxTop = 30;
$boxBottom = 30;
$boxLeft = 30;
$boxRight = 30;
$parSep = 10;
$fontSize = 10;
$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($imagick->newImage($boxWidth, $boxHeight, "white")) {
$draw = new ImagickDraw();
$draw->setStrokeColor("none");
$draw->setFont("Courier");
$draw->setFontSize($fontSize);
$draw->setTextAlignment(Imagick::ALIGN_LEFT);
$content = file_get_contents($infile);
$lines = preg_split('~\R~',$content);
$boxY = $boxTop;
$pagecount = 0;
foreach($lines as $line) {
if($line) {
$rlines = $this->wordWrapAnnotation($imagick, $draw, $line, $boxWidth-$boxLeft-$boxRight);
foreach($rlines[0] as $rline) {
if($pagecount == $page && $boxY < ($boxHeight-$boxBottom)) {
$imagick->annotateImage($draw, $boxLeft, $boxY, 0, $rline);
}
$boxY = $boxY + $rlines[1];
}
} else {
$boxY += $parSep;
}
if($boxY >= ($boxHeight-$boxBottom)) {
$pagecount++;
$boxY = $boxTop;
if($pagecount > $page)
break;
}
}
if(!empty($params['width']))
$imagick->scaleImage(min((int) $params['width'], $imagick->getImageWidth()), 0);
$imagick->setImageFormat('png');
$end = microtime(true);
if($this->logger) {
$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' with text service took '.($end-$start).' sec.', PEAR_LOG_INFO);
}
if($target) {
return $imagick->writeImage($target);
} else {
return $imagick->getImageBlob();
}
}
} catch (ImagickException $e) {
return false;
}
return false;
} /* }}} */
}