PHP Classes
elePHPant
Icontem

File: plugin_pngtransparency.php

Recommend this page to a friend!
Stumble It! Stumble It! Bookmark in del.icio.us Bookmark in del.icio.us
  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==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;
}
?>