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autoload/savant3/resources/Savant3_Plugin_image.php

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+<?php
+
+/**
+* 
+* Plugin to generate an <img ... /> tag.
+* 
+* @package Savant3
+* 
+* @author Paul M. Jones <pmjones@ciaweb.net>
+* 
+* @license http://www.gnu.org/copyleft/lesser.html LGPL
+* 
+* @version $Id: Savant3_Plugin_image.php,v 1.7 2005/08/12 14:34:09 pmjones Exp $
+*
+*/
+
+/**
+* 
+* Plugin to generate an <img ... /> tag.
+*
+* Support for alpha transparency of PNG files in Microsoft IE added by
+* Edward Ritter; thanks, Edward.
+* 
+* @package Savant3
+* 
+* @author Paul M. Jones <pmjones@ciaweb.net>
+* 
+*/
+
+class Savant3_Plugin_image extends Savant3_Plugin {
+	
+	
+	/**
+	* 
+	* The document root.
+	* 
+	* @access public
+	* 
+	* @var string
+	* 
+	*/
+	
+	protected $documentRoot = null;
+	
+	
+	/**
+	* 
+	* The base directory for images within the document root.
+	* 
+	* @access public
+	* 
+	* @var string
+	* 
+	*/
+	
+	protected $imageDir = null;
+	
+	
+	/**
+	* 
+	* Outputs an <img ... /> tag.
+	* 
+	* Microsoft IE alpha PNG support added by Edward Ritter.
+	* 
+	* @access public
+	* 
+	* @param string $file The path to the image on the local file system
+	* relative to $this->imageDir.
+	* 
+	* @param string $alt Alternative descriptive text for the image;
+	* defaults to the filename of the image.
+	* 
+	* @param int $border The border width for the image; defaults to zero.
+	* 
+	* @param int $width The displayed image width in pixels; defaults to
+	* the width of the image.
+	* 
+	* @param int $height The displayed image height in pixels; defaults to
+	* the height of the image.
+	* 
+	* @return string An <img ... /> tag.
+	* 
+	*/
+	
+	public function image($file, $alt = null, $height = null, $width = null,
+		$attr = null)
+	{
+		// is the document root set?
+		if (is_null($this->documentRoot) && isset($_SERVER['DOCUMENT_ROOT'])) {
+			// no, so set it
+			$this->documentRoot = $_SERVER['DOCUMENT_ROOT'];
+		}
+		
+		// make sure there's a DIRECTORY_SEPARATOR between the docroot
+		// and the image dir
+		if (substr($this->documentRoot, -1) != DIRECTORY_SEPARATOR &&
+			substr($this->imageDir, 0, 1) != DIRECTORY_SEPARATOR) {
+			$this->documentRoot .= DIRECTORY_SEPARATOR;
+		}
+		
+		// make sure there's a separator between the imageDir and the
+		// file name
+		if (substr($this->imageDir, -1) != DIRECTORY_SEPARATOR &&
+			substr($file, 0, 1) != DIRECTORY_SEPARATOR) {
+			$this->imageDir .= DIRECTORY_SEPARATOR;
+		}
+		
+		// the image file type code (PNG = 3)
+		$type = null;
+		
+		// get the file information
+		$info = false;
+		
+		if (strpos($file, '://') === false) {
+			// no "://" in the file, so it's local
+			$file = $this->imageDir . $file;
+			$tmp = $this->documentRoot . $file;
+			$info = @getimagesize($tmp);
+		} else {
+			// don't attempt to get file info from streams, it takes
+			// way too long.
+			$info = false;
+		}
+		
+		// did we find the file info?
+		if (is_array($info)) {
+		
+			// capture type info regardless
+			$type = $info[2];
+			
+			// capture size info where both not specified
+			if (is_null($width) && is_null($height)) {
+				$width = $info[0];
+				$height = $info[1];
+			}
+		}
+		
+		// clean up
+		unset($info);
+		
+		// is the file a PNG? if so, check user agent, we will need to
+		// make special allowances for Microsoft IE.
+		if (stristr($_SERVER['HTTP_USER_AGENT'], 'MSIE') && $type === 3) {
+			
+			// support alpha transparency for PNG files in MSIE
+			$html = '<span style="position: relative;';
+			
+			if ($height) {
+				$html .= ' height: ' . $height . 'px;';
+			}
+			
+			if ($width) {
+				$html .= ' width: ' . $width . 'px;';
+			}
+			
+			$html .= ' filter:progid:DXImageTransform.Microsoft.AlphaImageLoader';
+			$html .= "(src='" . htmlspecialchars($file) . "',sizingMethod='scale');\"";
+			$html .= ' title="' . htmlspecialchars($alt) . '"';
+			
+			$html .= $this->Savant->htmlAttribs($attr);
+
+			// done
+			$html .= '></span>';
+			
+		} else {
+			
+			// not IE, so build a normal image tag.
+			$html = '<img';
+			$html .= ' src="' . htmlspecialchars($file) . '"';
+			
+			// add the alt attribute
+			if (is_null($alt)) {
+				$alt = basename($file);
+			}
+			$html .= ' alt="' . htmlspecialchars($alt) . '"';
+			
+			// add the height attribute
+			if ($height) {
+				$html .= ' height="' . htmlspecialchars($height) . '"';
+			}
+			
+			// add the width attribute
+			if ($width) {
+				$html .= ' width="' . htmlspecialchars($width) . '"';
+			}
+			
+			$html .= $this->Savant->htmlAttribs($attr);
+			
+			// done
+			$html .= ' />';
+			
+		}
+		
+		// done!
+		return $html;
+	}
+}
+
+?>