mpdf/src/SizeConverter.php at development · derklaro/mpdf · GitHub

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<?php

namespace Mpdf;

use Psr\Log\LoggerInterface;
use Mpdf\Log\Context as LogContext;

class SizeConverter implements \Psr\Log\LoggerAwareInterface
{

private $dpi;

private $defaultFontSize;

/**
 * @var \Mpdf\Mpdf
 */
private $mpdf;

/**
 * @var \Psr\Log\LoggerInterface
 */
private $logger;

public function __construct($dpi, $defaultFontSize, Mpdf $mpdf, LoggerInterface $logger)
{
$this->dpi = $dpi;
$this->defaultFontSize = $defaultFontSize;
$this->mpdf = $mpdf;
$this->logger = $logger;
}

public function setLogger(LoggerInterface $logger)
{
$this->logger = $logger;
}

/**
 * Depends of maxsize value to make % work properly. Usually maxsize == pagewidth
 * For text $maxsize = $fontsize
 * Setting e.g. margin % will use maxsize (pagewidth) and em will use fontsize
 *
 * @param mixed $size
 * @param mixed $maxsize
 * @param mixed $fontsize
 * @param mixed $usefontsize Set false for e.g. margins - will ignore fontsize for % values
 *
 * @return float Final size in mm
 */
public function convert($size = 5, $maxsize = 0, $fontsize = false, $usefontsize = true)
{
$size = trim(strtolower($size));
$res = preg_match('/^(?P<size>[-0-9.,]+([eE]\-?[0-9]+)?)?(?P<unit>[%a-z-]+)?$/', $size, $parts);
if (!$res) {
// ignore definition
$this->logger->warning(sprintf('Invalid size representation "%s"', $size), ['context' => LogContext::CSS_SIZE_CONVERSION]);
}

$unit = !empty($parts['unit']) ? $parts['unit'] : null;
$size = !empty($parts['size']) ? (float) $parts['size'] : 0.0;

switch ($unit) {
case 'mm':
// do nothing
break;

case 'cm':
$size *= 10;
break;

case 'pt':
$size *= 1 / Mpdf::SCALE;
break;

case 'rem':
$size *= $this->mpdf->default_font_size / Mpdf::SCALE;
break;

case '%':
if ($fontsize && $usefontsize) {
$size *= $fontsize / 100;
} else {
$size *= $maxsize / 100;
}
break;

case 'in':
// mm in an inch
$size *= 25.4;
break;

case 'pc':
// PostScript picas
$size *= 38.1 / 9;
break;

case 'ex':
// Approximates "ex" as half of font height
$size *= $this->multiplyFontSize($fontsize, $maxsize, 0.5);
break;

case 'em':
$size *= $this->multiplyFontSize($fontsize, $maxsize, 1);
break;

case 'thin':
$size = 1 * (25.4 / $this->dpi);
break;

case 'medium':
$size = 3 * (25.4 / $this->dpi);
// Commented-out dead code from legacy method
// $size *= $this->multiplyFontSize($fontsize, $maxsize, 1);
break;

case 'thick':
$size = 5 * (25.4 / $this->dpi); // 5 pixel width for table borders
break;

case 'xx-small':
$size *= $this->multiplyFontSize($fontsize, $maxsize, 0.7);
break;

case 'x-small':
$size *= $this->multiplyFontSize($fontsize, $maxsize, 0.77);
break;

case 'small':
$size *= $this->multiplyFontSize($fontsize, $maxsize, 0.86);
break;

case 'large':
$size *= $this->multiplyFontSize($fontsize, $maxsize, 1.2);
break;

case 'x-large':
$size *= $this->multiplyFontSize($fontsize, $maxsize, 1.5);
break;

case 'xx-large':
$size *= $this->multiplyFontSize($fontsize, $maxsize, 2);
break;

case 'px':
default:
$size *= (25.4 / $this->dpi);
break;
}

return $size;
}

private function multiplyFontSize($fontsize, $maxsize, $ratio)
{
if ($fontsize) {
return $fontsize * $ratio;
}

return $maxsize * $ratio;
}
}