for mpdf 4.2. progressive jpeg image path.

mpdf.progressive-jpeg.patch

Index: mpdf.php
===================================================================
--- mpdf.php	(original)
+++ mpdf.php	(new)
@@ -8000,16 +8000,25 @@
 
 	// JPEG
 	if ($type == 'jpeg' || $type == 'jpg') {
-		$hdr = $this->_jpgHeaderFromString($data);
-		if (!$hdr) { return $this->_imageError($file, $firsttime, 'Error parsing JPG header'); }
-		$a = $this->_jpgDataFromHeader($hdr);
-		$info = array('w'=>$a[0],'h'=>$a[1],'cs'=>$a[2],'bpc'=>$a[3],'f'=>'DCTDecode','data'=>$data);
-		$info['type']='jpg';
-		if ($firsttime) {
-			$info['i']=count($this->images)+1;
-			$this->images[$file]=$info;
-		}
-		return $info;
+	  
+        $im = @imagecreatefromstring($data);
+        if ($im) {
+            $tempfile = _MPDF_PATH.'tmp/_tempImgPNG'.RAND(1,10000).'.png';
+            imageinterlace($im, false);
+            $check = @imagepng($im, $tempfile);
+            if (!$check) { return $this->_imageError($file, $firsttime, 'Error creating temporary file ('.$tempfile.') whilst using GD library to parse JPEG image'); }
+            $info = $this->_getImage($tempfile, false);
+            if (!$info) { return $this->_imageError($file, $firsttime, 'Error parsing temporary file ('.$tempfile.') created with GD library to parse JPEG image'); }
+            imagedestroy($im);
+            unlink($tempfile);
+            $info['type']='jpg';
+            if ($firsttime) {
+                $info['i']=count($this->images)+1;
+                $this->images[$file]=$info;
+            }
+            return $info;
+        }
+        else { return $this->_imageError($file, $firsttime, 'Error creating GD image file from JPEG image'); }
 	}
 
 	// PNG