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<?php
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Urs Gehrig <urs@circle.ch> |
// +----------------------------------------------------------------------+
//
// $Id: image2svg.php,v 1.1 2002/05/01 21:31:37 chregu Exp $
/**
* XML_image2svg - Image to SVG conversion
*
* The class converts images, such as of the format JPEG, PNG
* and GIF to a standalone SVG representation. The image is being
* encoded by the PHP native encode_base64() function. You can use it
* to get back a complete SVG file, which is based on a predefinded,
* easy adaptable template file, or you can take the encoded
* file as a return value, using the get() method. Due to the
* encoding by base64, the SVG files will increase approx. 30% in
* size compared to the conventional image.
*
* NOTE:
* Since PHP 4.0.5 GetImageSize() support has been added.
*
* EXAMPLE:
* $i = &new XML_image2svg("test.jpg" );
* $i->tplFile = "tpl.image.svg";
* $i->show();
*
* The class allows also commandline conversion of images:
* C:\>php-cli -f Test_image2svg.php > test.svg
*
* REFERENCES:
* http://www.ietf.org/rfc/rfc2397.txt, The "data" URL scheme
* http://www.ietf.org/rfc/rfc2045.txt, Multipurpose Internet Mail Extensions
* http://www.w3.org/Graphics/SVG/, Scalable Vector Graphics (SVG)
*/
/**
* Image to svg conversion.
*
*
* @version $Id: image2svg.php,v 1.1 2002/05/01 21:31:37 chregu Exp $
* @package XML
* @author Urs Gehrig <urs@circle.ch>
*/
require_once( "PEAR.php") ;
require_once( "HTML/IT.php") ;
class XML_image2svg extends PEAR {
/**
* TODO: Modify the quality of the output image. Needs GD support.
*
* @var imageQuality
*/
var $imageQuality = 0.8;
/**
* Image file pointer.
*
*/
var $fp = null;
/**
* Storage representation of the image string
*
* @var string
*/
var $buffer = "";
/**
* Image information
*
* @var array
*/
var $par = array(0, 0, 0, "" );
/**
* Constructs a new XML_image2svg object.
*
* @param string image filename
* @access public
* @author Urs Gehrig <urs@circle.ch>
*/
function XML_image2svg ($fileName="" )
{
$this->PEAR();
$this->fileName = $fileName;
$this->tpl = new IntegratedTemplate("." );
$this->tplFile = "";
$this->_getImage();
}
/**
* Read the image file binary-safe
*
* @access private
* @return mixed bool on success or an error object otherwise
* @author Urs Gehrig <urs@circle.ch>
*/
function _getImage ()
{
if(file_exists($this->fileName )) {
$fp = fopen ($this->fileName, "rb" );
$this->buffer = fread($fp, filesize ($this->fileName ));
if (!$fp) {
return $this->errorHandler("FAILED_OPENING_FILE", __FILE__, __LINE__ );
}
$this->fp = $fp;
fclose ($fp);
return $this->_getImageParamteres();
}
return $this->errorHandler("FILE_NOT_FOUND", __FILE__, __LINE__ );
}
/**
* Get the specific image parameters
*
* @access private
* @return mixed bool on success or an error object on fail
* @author Urs Gehrig <urs@circle.ch>
*/
function _getImageParamteres ()
{
if (is_resource($this->fp )) {
$this->par = @getimagesize($this->fileName );
SWITCH ($this->par[2] ) {
case 1:
$this->imagetype = 'image/gif';
break;
case 2:
$this->imagetype = 'image/jpg';
break;
case 3:
$this->imagetype = 'image/png';
break;
default:
return $this->errorHandler("MIME_ERROR", __FILE__, __LINE__ );
}
return TRUE;
}
return $this->errorHandler("READ_ERROR", __FILE__, __LINE__ );
}
/**
* Convert the image to an SVG file. Having specified a template file
* allows direct inclusion of the image into a more sophisticated SVG file;
* while not giving a template file, a most slim standalone SVG string will
* be returned.
*
* @access private
* @return mixed a string on success or an error object otherwise
* @author Urs Gehrig <urs@circle.ch>
*/
function _convertToSvg ()
{
if(file_exists($this->tplFile ) ) {
if(strlen($this->tplFile )) {
$this->tpl->loadTemplatefile($this->tplFile, true, true);
$content = array(
"img_width" => $this->par[0],
"img_height" => $this->par[1],
"data_url_scheme" => sprintf("data:%s;base64,%s",
$this->imagetype,
$this->encodeImage()
)
);
$this->tpl->setVariable($content);
return $this->tpl->get();
} else {
$s .= sprintf("<?xml version=\"1.0\" ?>" );
$s .= sprintf("<svg %s viewBox=\"0 0 %s %s\" xml:space=\"preserve\">",
$this->par[3],
$this->par[0],
$this->par[1]
);
$s .= sprintf("<g><image %s xlink:href=\"data:%s;base64,%s\" /></g>",
$this->par[3],
$this->imagetype,
$this->encodeImage()
);
$s .= sprintf("</svg>");
return $s;
}
} else {
return $this->errorHandler("TEMPLATE_FILE_MISSING", __FILE__, __LINE__ );
}
}
/**
* Encode image by base 64
*
* @access public
* @return string Returns encoded image as string
* @author Urs Gehrig <urs@circle.ch>
*/
function encodeImage ()
{
return base64_encode($this->buffer );
}
/**
* Return the SVG output
*
* @access public
* @return mixed PEAR_Error object or string
* @author Urs Gehrig <urs@circle.ch>
*/
function get ()
{
if (is_resource($this->fp )) {
return $this->_convertToSvg();
}
return $this->errorHandler("CONVERSION", __FILE__, __LINE__ );;
}
/**
* Display the SVG output
*
* @access public
* @return mixed PEAR_Error object or bool on success
* @author Urs Gehrig <urs@circle.ch>
*/
function show ()
{
if ($res = $this->get() ) {
header("Content-type: image/svg+xml" );
echo $res;
return TRUE;
}
return $this->errorHandler("UNKNOWN", __FILE__, __LINE__ );
}
/**
* Handling the error messages
*
* @param string error message
* @param string file where the error occured
* @param string linenumber where the error occured
* @access public
* @return object PEAR_Error object
* @author Urs Gehrig <urs@circle.ch>
*/
function errorHandler ($err="UNKNOWN", $file=__FILE__, $line=__LINE__ )
{
$this->error_codes = array (
"FILE_NOT_FOUND" => "The image file could not be found.",
"FAILED_OPENING_FILE" => "The image file could not be opened.",
"READ_ERROR" => "The image file could not be read.",
"MIME_ERROR" => "Unsupported mimetype.",
"TEMPLATE_FILE_MISSING" => "The SVG template file is missing.",
"CONVERSION" => "Error on returning the conversion result.",
"UNKNOWN" => "Unknown error."
);
return $this->raiseError(sprintf("%s [%s on line %d].",
$this->error_codes[$err],
$file,
$line ),
null,
PEAR_ERROR_DIE
);
}
/**
* Class destructor
*
* @access private
* @author Urs Gehrig <urs@circle.ch>
*/
function _XML_image2svg ()
{
$this->_PEAR();
}
}
?>
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