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  Classes of Helmut Daschnigrum  >  DirecTemplate  >  plugin_pngtransparency.php  >  Download  
File: plugin_pngtransparency.php
Role: Auxiliary script
Content type: text/plain
Description: PNG transparency plugin for IE PNG support
Class: DirecTemplate
Template engine based on regular expressions
Author: By
Last change:
Date: 8 years ago
Size: 9,125 bytes
 

Contents

Class file image Download
<?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
 *   justin.koivisto@gmail.com
 *   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==|| $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;
}
?>