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<?php
/**
* BCGDrawJPG.php
*--------------------------------------------------------------------
*
* Image Class to draw JPG images with possibility to set DPI
*
*--------------------------------------------------------------------
* Revision History
* v2.1.0 8 nov 2009 Jean-Sébastien Goupil
*--------------------------------------------------------------------
* $Id: BCGDrawJPG.php,v 1.1 2009/11/09 04:14:37 jsgoupil Exp $
*--------------------------------------------------------------------
* Copyright (C) Jean-Sebastien Goupil
* http://www.barcodephp.com
*/
include_once('BCGDraw.php');
if (!function_exists('file_put_contents')) {
function file_put_contents($filename, $data) {
$f = @fopen($filename, 'w');
if (!$f) {
return false;
} else {
$bytes = fwrite($f, $data);
fclose($f);
return $bytes;
}
}
}
class BCGDrawJPG extends BCGDraw {
private $dpi;
private $quality;
/**
* Constructor
*
* @param resource $im
*/
public function __construct($im) {
parent::__construct($im);
}
/**
* Sets the DPI
*
* @param int $dpi
*/
public function setDPI($dpi) {
if(is_int($dpi)) {
$this->dpi = max(1, $dpi);
} else {
$this->dpi = null;
}
}
/**
* Sets the quality of the JPG
*
* @param int $quality
*/
public function setQuality($quality) {
$this->quality = $quality;
}
/**
* Draws the JPG on the screen or in a file
*/
public function draw() {
ob_start();
imagejpeg($this->im, null, $this->quality);
$bin = ob_get_contents();
ob_end_clean();
$this->setInternalProperties($bin);
if (empty($this->filename)) {
echo $bin;
} else {
file_put_contents($this->filename, $bin);
}
}
private function setInternalProperties(&$bin) {
$this->internalSetDPI($bin);
$this->internalSetC($bin);
}
private function internalSetDPI(&$bin) {
if($this->dpi !== null) {
$bin = substr_replace($bin, pack("Cnn", 0x01, $this->dpi, $this->dpi), 13, 5);
}
}
private function internalSetC(&$bin) {
if(strcmp(substr($bin, 0, 4), pack('H*', 'FFD8FFE0')) === 0) {
$offset = 4 + (ord($bin[4]) << 8 | ord($bin[5]));
$firstPart = substr($bin, 0, $offset);
$secondPart = substr($bin, $offset);
$cr = pack('H*', 'FFFE004447656E657261746564207769746820426172636F64652047656E657261746F7220666F722050485020687474703A2F2F7777772E626172636F64657068702E636F6D');
$bin = $firstPart;
$bin .= $cr;
$bin .= $secondPart;
}
}
}
?>
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