<?php
/*
* KOIVI PNG Alpha IMG Tag Replacer for PHP (C) 2004-2005 Justin Koivisto
* Version 2.0.6
* Last Modified: 2/25/2005
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Full license agreement notice can be found in the LICENSE file contained
* within this distribution package.
*
* Justin Koivisto
* [email protected]
* http://www.koivi.com
*
* Modifies IMG and INPUT tags for MSIE5+ browsers to ensure that PNG-24
* transparencies are displayed correctly. Replaces original SRC attribute
* with a transparent GIF file (spacer.png) that is located in the same
* directory as the orignal image, and adds the STYLE attribute needed to for
* the browser. (Matching is case-insensitive. However, the width attribute
* should come before height.
*
* Also replaces code for PNG images specified as backgrounds via:
* background-image: url(image.png); or background-image: url('image.png');
* When using PNG images in the background, there is no need to use a spacer.png
* image. (Only supports inline CSS at this point.)
*
* @param $x String containing the content to search and replace in.
* @param $img_path The path to the directory with the spacer image relative to
* the DOCUMENT_ROOT. If none os supplied, the spacer.png image
* should be in the same directory as PNG-24 image.
* @param $sizeMeth String containing the sizingMethod to be used in the
* Microsoft.AlphaImageLoader call. Possible values are:
* crop - Clips the image to fit the dimensions of the object.
* image - Enlarges or reduces the border of the object to fit
* the dimensions of the image.
* scale - Default. Stretches or shrinks the image to fill the borders
* of the object.
* @result Returns the modified string.
*/
function replacePngTags($x,$img_path='',$sizeMeth='scale',$escapequotes=false){
$quotechar = $escapequotes ? '\"' : '"';
$arr2=array();
// make sure that we are only replacing for the Windows versions of Internet
// Explorer 5+
$msie='/msie\s(5\.[5-9]|[6-9]\.[0-9]*).*(win)/i';
if( !isset($_SERVER['HTTP_USER_AGENT']) ||
!preg_match($msie,$_SERVER['HTTP_USER_AGENT']) ||
preg_match('/opera/i',$_SERVER['HTTP_USER_AGENT']))
return $x;
// find all the png images in backgrounds
preg_match_all('/background-image:\s*url\((\'?)([^\)]+\.png)\1\);/Uis',$x,$background);
for($i=0;$i<count($background[0]);$i++){
// simply replace:
// "background-image: url('image.png');"
// with:
// "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(
// enabled=true, sizingMethod=scale src='image.png');"
// I don't think that the background-repeat styles will work with this...
$x=str_replace($background[0][$i],'filter:progid:DXImageTransform.'.
'Microsoft.AlphaImageLoader(enabled=true, sizingMethod='.$sizeMeth.
' src=\''.$background[2][$i].'\');',$x);
}
// find all the IMG tags with ".png" in them
$pattern='/<(input|img)[^>]*src=(\\\'|\\")([^>]*\.png)\2[^>]*>/i';
preg_match_all($pattern,$x,$images);
for($num_images=0;$num_images<count($images[0]);$num_images++){
// for each found image pattern
$original=$images[0][$num_images];
$quote=$images[2][$num_images];
$atts=''; $width=0; $height=0; $modified=$original;
// We do this so that we can put our spacer.png image in the same
// directory as the image - if a path wasn't passed to the function
if(empty($img_path)){
$tmp=split('[\\/]',$images[3][$num_images]);
$this_img=array_pop($tmp);
$img_path=join('/',$tmp);
if(empty($img_path)){
// this was a relative URI, image should be in this directory
$tmp=split('[\\/]',$_SERVER['SCRIPT_NAME']);
array_pop($tmp); // trash the script name, we only want the directory name
$img_path=join('/',$tmp).'/';
}else{
$img_path.='/';
}
}else if(substr($img_path,-1)!='/'){
// in case the supplied path didn't end with a /
$img_path.='/';
}
// this is a really ugly hack -- if the image class is _no_transparency, that indicates
// that we shouldn't try to apply the IE alpha transparency fix to the image
if (strpos($images[0][$num_images],'class="_no_transparency"')!==false) continue;
// If the size is defined by styles, find them
preg_match_all(
'/style=(\\\'|\\").*(\s?width:\s?([0-9]+(px|%));).*'.
'(\s?height:\s?([0-9]+(px|%));).*\\1/Ui',
$images[0][$num_images],$arr2);
if(is_array($arr2) && count($arr2[0])){
// size was defined by styles, get values
$width=$arr2[3][0];
$height=$arr2[6][0];
// remove the width and height from the style
$stripper=str_replace(' ','\s','/('.$arr2[2][0].'|'.$arr2[5][0].')/');
// Also remove any empty style tags
$modified=preg_replace(
'`style='.$arr2[1][0].$arr2[1][0].'`i',
'',
preg_replace($stripper,'',$modified));
}else{
// size was not defined by styles, get values from attributes
preg_match_all('/width=(\\\'|\\")?([0-9%]+)\\1?/i',$images[0][$num_images],$arr2);
if(is_array($arr2) && count($arr2[0])){
$width=$arr2[2][0];
if(is_numeric($width))
$width.='px';
// remove width from the tag
$modified=str_replace($arr2[0][0],'',$modified);
}
preg_match_all('/height=(\\\'|\\")?([0-9%]+)\\1?/i',$images[0][$num_images],$arr2);
if(is_array($arr2) && count($arr2[0])){
$height=$arr2[2][0];
if(is_numeric($height))
$height.='px';
// remove height from the tag
$modified=str_replace($arr2[0][0],'',$modified);
}
}
if($width==0 || $height==0){
// width and height not defined in HTML attributes or css style
$imagename = $images[3][$num_images];
if (substr($imagename,0,strlen(ADMIN_URI))==ADMIN_URI) {
$imagename = ADMIN_PATH.substr($imagename,strlen(ADMIN_URI));
} else {
$imagename = $_SERVER['DOCUMENT_ROOT'].$imagename;
}
if ($GLOBALS['_pngtrans_sizecache'][$imagename]) {
$size = $GLOBALS['_pngtrans_sizecache'][$imagename];
$width=$size[0].'px';
$height=$size[1].'px';
} else {
if(file_exists($imagename)){
// image is on this filesystem, get width & height
$size = getimagesize($imagename);
$width = $size[0].'px';
$height = $size[1].'px';
$GLOBALS['_pngtrans_sizecache'][$imagename] = array($size[0],$size[1]);
} else {
// can't figure out the width/height, so disable alpha transparency for this image
continue;
}
}
}
// end quote is already supplied by originial src attribute
$replace_src_with=$quote.$img_path.'spacer.png'.$quote.' style='.$quotechar.'width: '.$width.
'; height: '.$height.'; filter: progid:DXImageTransform.'.
'Microsoft.AlphaImageLoader(src=\''.$images[3][$num_images].'\', sizingMethod='.
$sizeMeth.');'.$quotechar;
// now create the new tag from the old
$new_tag=str_replace($quote.$images[3][$num_images].$quote,$replace_src_with,
str_replace(' ',' ',$modified));
// now place the new tag into the content
$x=str_replace($original,$new_tag,$x);
}
return $x;
}
function replacePngTagsQuoted($x,$img_path='',$sizeMeth='scale') {
return replacePngTags($x,$img_path,$sizeMeth,true);
}
function dt_register_pngtransparency(&$tpl) {
$tpl->filters['pngtransparency'] = 'replacePngTags';
return true;
}
?>
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