--- /dev/null
+ <?php
+/*******************************************************************************
+* Software: PDF_ImageAlpha
+* Version: 1.4
+* Date: 2009-12-28
+* Author: Valentin Schmidt
+*
+* Requirements: FPDF 1.6
+*
+* This script allows to use images (PNGs or JPGs) with alpha-channels.
+* The alpha-channel can be either supplied as separate 8-bit PNG ("mask"),
+* or, for PNGs, also an internal alpha-channel can be used.
+* For the latter the GD 2.x extension is required.
+*******************************************************************************/
+
+require_once 'Fpdf.php';
+
+class Fpdf_ImageAlpha extends Fpdf{
+
+//Private properties
+var $tmpFiles = array();
+
+/*******************************************************************************
+* *
+* Public methods *
+* *
+*******************************************************************************/
+function Image($file,$x,$y,$w=0,$h=0,$type='',$link='', $isMask=false, $maskImg=0)
+{
+ //Put an image on the page
+ if(!isset($this->images[$file]))
+ {
+ //First use of image, get info
+ if($type=='')
+ {
+ $pos=strrpos($file,'.');
+ if(!$pos)
+ $this->Error('Image file has no extension and no type was specified: '.$file);
+ $type=substr($file,$pos+1);
+ }
+ $type=strtolower($type);
+ //$mqr=get_magic_quotes_runtime();
+ //@set_magic_quotes_runtime(0);
+ if($type=='jpg' || $type=='jpeg')
+ $info=$this->_parsejpg($file);
+ elseif($type=='png'){
+ $info=$this->_parsepng($file);
+ if ($info=='alpha') return $this->ImagePngWithAlpha($file,$x,$y,$w,$h,$link);
+ }
+ else
+ {
+ //Allow for additional formats
+ $mtd='_parse'.$type;
+ if(!method_exists($this,$mtd))
+ $this->Error('Unsupported image type: '.$type);
+ $info=$this->$mtd($file);
+ }
+ //set_magic_quotes_runtime($mqr);
+
+ if ($isMask){
+ $info['cs']="DeviceGray"; // try to force grayscale (instead of indexed)
+ }
+ $info['i']=count($this->images)+1;
+ if ($maskImg>0) $info['masked'] = $maskImg;###
+ $this->images[$file]=$info;
+ }
+ else
+ $info=$this->images[$file];
+ //Automatic width and height calculation if needed
+ if($w==0 && $h==0)
+ {
+ //Put image at 72 dpi
+ $w=$info['w']/$this->k;
+ $h=$info['h']/$this->k;
+ }
+ if($w==0)
+ $w=$h*$info['w']/$info['h'];
+ if($h==0)
+ $h=$w*$info['h']/$info['w'];
+
+ // embed hidden, ouside the canvas
+ if ((float)FPDF_VERSION>=1.7){
+ if ($isMask) $x = ($this->CurOrientation=='P'?$this->CurPageSize[0]:$this->CurPageSize[1]) + 10;
+ }else{
+ if ($isMask) $x = ($this->CurOrientation=='P'?$this->CurPageFormat[0]:$this->CurPageFormat[1]) + 10;
+ }
+
+ $this->_out(sprintf('q %.2f 0 0 %.2f %.2f %.2f cm /I%d Do Q',$w*$this->k,$h*$this->k,$x*$this->k,($this->h-($y+$h))*$this->k,$info['i']));
+ if($link)
+ $this->Link($x,$y,$w,$h,$link);
+
+ return $info['i'];
+}
+
+// needs GD 2.x extension
+// pixel-wise operation, not very fast
+function ImagePngWithAlpha($file,$x,$y,$w=0,$h=0,$link='')
+{
+ $tmp_alpha = tempnam('.', 'mska');
+ $this->tmpFiles[] = $tmp_alpha;
+ $tmp_plain = tempnam('.', 'mskp');
+ $this->tmpFiles[] = $tmp_plain;
+
+ list($wpx, $hpx) = getimagesize($file);
+ $img = imagecreatefrompng($file);
+ $alpha_img = imagecreate( $wpx, $hpx );
+
+ // generate gray scale pallete
+ for($c=0;$c<256;$c++) ImageColorAllocate($alpha_img, $c, $c, $c);
+
+ // extract alpha channel
+ $xpx=0;
+ while ($xpx<$wpx){
+ $ypx = 0;
+ while ($ypx<$hpx){
+ $color_index = imagecolorat($img, $xpx, $ypx);
+ $alpha = 255-($color_index>>24)*255/127; // GD alpha component: 7 bit only, 0..127!
+ imagesetpixel($alpha_img, $xpx, $ypx, $alpha);
+ ++$ypx;
+ }
+ ++$xpx;
+ }
+
+ imagepng($alpha_img, $tmp_alpha);
+ imagedestroy($alpha_img);
+
+ // extract image without alpha channel
+ $plain_img = imagecreatetruecolor ( $wpx, $hpx );
+ imagecopy ($plain_img, $img, 0, 0, 0, 0, $wpx, $hpx );
+ imagepng($plain_img, $tmp_plain);
+ imagedestroy($plain_img);
+
+ //first embed mask image (w, h, x, will be ignored)
+ $maskImg = $this->Image($tmp_alpha, 0,0,0,0, 'PNG', '', true);
+
+ //embed image, masked with previously embedded mask
+ $this->Image($tmp_plain,$x,$y,$w,$h,'PNG',$link, false, $maskImg);
+}
+
+function Close()
+{
+ parent::Close();
+ // clean up tmp files
+ foreach($this->tmpFiles as $tmp) @unlink($tmp);
+}
+
+/*******************************************************************************
+* *
+* Private methods *
+* *
+*******************************************************************************/
+function _putimages()
+{
+ $filter=($this->compress) ? '/Filter /FlateDecode ' : '';
+ reset($this->images);
+ while(list($file,$info)=each($this->images))
+ {
+ $this->_newobj();
+ $this->images[$file]['n']=$this->n;
+ $this->_out('<</Type /XObject');
+ $this->_out('/Subtype /Image');
+ $this->_out('/Width '.$info['w']);
+ $this->_out('/Height '.$info['h']);
+
+ if (isset($info["masked"])) $this->_out('/SMask '.($this->n-1).' 0 R'); ###
+
+ if($info['cs']=='Indexed')
+ $this->_out('/ColorSpace [/Indexed /DeviceRGB '.(strlen($info['pal'])/3-1).' '.($this->n+1).' 0 R]');
+ else
+ {
+ $this->_out('/ColorSpace /'.$info['cs']);
+ if($info['cs']=='DeviceCMYK')
+ $this->_out('/Decode [1 0 1 0 1 0 1 0]');
+ }
+ $this->_out('/BitsPerComponent '.$info['bpc']);
+ if(isset($info['f']))
+ $this->_out('/Filter /'.$info['f']);
+ if(isset($info['parms']))
+ $this->_out($info['parms']);
+ if(isset($info['trns']) && is_array($info['trns']))
+ {
+ $trns='';
+ for($i=0;$i<count($info['trns']);$i++)
+ $trns.=$info['trns'][$i].' '.$info['trns'][$i].' ';
+ $this->_out('/Mask ['.$trns.']');
+ }
+ $this->_out('/Length '.strlen($info['data']).'>>');
+ $this->_putstream($info['data']);
+ unset($this->images[$file]['data']);
+ $this->_out('endobj');
+ //Palette
+ if($info['cs']=='Indexed')
+ {
+ $this->_newobj();
+ $pal=($this->compress) ? gzcompress($info['pal']) : $info['pal'];
+ $this->_out('<<'.$filter.'/Length '.strlen($pal).'>>');
+ $this->_putstream($pal);
+ $this->_out('endobj');
+ }
+ }
+}
+
+// this method overwriing the original version is only needed to make the Image method support PNGs with alpha channels.
+// if you only use the ImagePngWithAlpha method for such PNGs, you can remove it from this script.
+function _parsepng($file)
+{
+ //Extract info from a PNG file
+ $f=fopen($file,'rb');
+ if(!$f)
+ $this->Error('Can\'t open image file: '.$file);
+ //Check signature
+ if(fread($f,8)!=chr(137).'PNG'.chr(13).chr(10).chr(26).chr(10))
+ $this->Error('Not a PNG file: '.$file);
+ //Read header chunk
+ fread($f,4);
+ if(fread($f,4)!='IHDR')
+ $this->Error('Incorrect PNG file: '.$file);
+ $w=$this->_readint($f);
+ $h=$this->_readint($f);
+ $bpc=ord(fread($f,1));
+ if($bpc>8)
+ $this->Error('16-bit depth not supported: '.$file);
+ $ct=ord(fread($f,1));
+ if($ct==0)
+ $colspace='DeviceGray';
+ elseif($ct==2)
+ $colspace='DeviceRGB';
+ elseif($ct==3)
+ $colspace='Indexed';
+ else {
+ fclose($f); // the only changes are
+ return 'alpha'; // made in those 2 lines
+ }
+ if(ord(fread($f,1))!=0)
+ $this->Error('Unknown compression method: '.$file);
+ if(ord(fread($f,1))!=0)
+ $this->Error('Unknown filter method: '.$file);
+ if(ord(fread($f,1))!=0)
+ $this->Error('Interlacing not supported: '.$file);
+ fread($f,4);
+ $parms='/DecodeParms <</Predictor 15 /Colors '.($ct==2 ? 3 : 1).' /BitsPerComponent '.$bpc.' /Columns '.$w.'>>';
+ //Scan chunks looking for palette, transparency and image data
+ $pal='';
+ $trns='';
+ $data='';
+ do
+ {
+ $n=$this->_readint($f);
+ $type=fread($f,4);
+ if($type=='PLTE')
+ {
+ //Read palette
+ $pal=fread($f,$n);
+ fread($f,4);
+ }
+ elseif($type=='tRNS')
+ {
+ //Read transparency info
+ $t=fread($f,$n);
+ if($ct==0)
+ $trns=array(ord(substr($t,1,1)));
+ elseif($ct==2)
+ $trns=array(ord(substr($t,1,1)),ord(substr($t,3,1)),ord(substr($t,5,1)));
+ else
+ {
+ $pos=strpos($t,chr(0));
+ if($pos!==false)
+ $trns=array($pos);
+ }
+ fread($f,4);
+ }
+ elseif($type=='IDAT')
+ {
+ //Read image data block
+ $data.=fread($f,$n);
+ fread($f,4);
+ }
+ elseif($type=='IEND')
+ break;
+ else
+ fread($f,$n+4);
+ }
+ while($n);
+ if($colspace=='Indexed' && empty($pal))
+ $this->Error('Missing palette in '.$file);
+ fclose($f);
+ return array('w'=>$w,'h'=>$h,'cs'=>$colspace,'bpc'=>$bpc,'f'=>'FlateDecode','parms'=>$parms,'pal'=>$pal,'trns'=>$trns,'data'=>$data);
+}
+
+function _readstream($f, $n)
+{
+ // Read n bytes from stream
+ $res = '';
+ while($n>0 && !feof($f))
+ {
+ $s = fread($f,$n);
+ if($s===false)
+ $this->Error('Error while reading stream');
+ $n -= strlen($s);
+ $res .= $s;
+ }
+ if($n>0)
+ $this->Error('Unexpected end of stream');
+ return $res;
+}
+
+function _readint($f)
+{
+ // Read a 4-byte integer from stream
+ $a = unpack('Ni',$this->_readstream($f,4));
+ return $a['i'];
+}
+}
+
\ No newline at end of file
projects / pear / blobdiff