1 <?php rcs_id('$Id: WikiPluginCached.php,v 1.11 2004-09-06 09:12:46 rurban Exp $');
3 Copyright (C) 2002 Johannes Große (Johannes Große)
5 This file is part of PhpWiki.
7 PhpWiki is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 PhpWiki is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with PhpWiki; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * You should set up the options in config/config.ini at Part seven:
24 * $ pear install http://pear.php.net/get/Cache
25 * This file belongs to WikiPluginCached.
26 * @author Johannes Große
30 require_once "lib/WikiPlugin.php";
31 // require_once "lib/plugincache-config.php"; // replaced by config.ini settings!
33 // Try the system pear class. See newCache()
34 @require_once('Cache.php');
36 define('PLUGIN_CACHED_HTML',0);
37 define('PLUGIN_CACHED_IMG_INLINE',1);
38 define('PLUGIN_CACHED_IMG_ONDEMAND',2);
39 define('PLUGIN_CACHED_MAP',3);
42 * An extension of the WikiPlugin class to allow image output and
44 * There are several abstract functions to be overloaded.
45 * Have a look at the example files
46 * <ul><li>plugin/TexToPng.php</li>
47 * <li>plugin/CacheTest.php (extremely simple example)</li>
48 * <li>plugin/RecentChanges.php</li>
49 * <li>plugin/VisualWiki.php</li></ul>
51 * @author Johannes Große
54 class WikiPluginCached extends WikiPlugin
57 * Produces URL and id number from plugin arguments which later on,
58 * will allow to find a cached image or to reconstruct the complete
59 * plugin call to recreate the image.
61 * @param cache object the cache object used to store the images
62 * @param argarray array all parameters (including those set to
63 * default values) of the plugin call to be
66 * @return array(id,url)
68 function genUrl($cache, $argarray) {
70 //$cacheparams = $GLOBALS['CacheParams'];
72 $plugincall = serialize( array(
73 'pluginname' => $this->getName(),
74 'arguments' => $argarray ) );
75 $id = $cache->generateId( $plugincall );
77 $url = DATA_PATH . '/getimg.php?';
78 if (($lastchar = substr($url,-1)) == '/') {
79 $url = substr($url, 0, -1);
81 if (strlen($plugincall) > PLUGIN_CACHED_MAXARGLEN) {
82 // we can't send the data as URL so we just send the id
83 if (!$request->getSessionVar('imagecache'.$id)) {
84 $request->setSessionVar('imagecache'.$id, $plugincall);
86 $plugincall = false; // not needed anymore
89 if ($lastchar == '?') {
90 // this indicates that a direct call of the image creation
91 // script is wished ($url is assumed to link to the script)
92 $url .= "id=$id" . ($plugincall ? '&args='.rawurlencode($plugincall) : '');
95 // We are supposed to use the indirect 404 ErrorDocument method
96 // ($url is assumed to be the url of the image in
97 // cache_dir and the image creation script is referred to in the
98 // ErrorDocument 404 directive.)
99 $url .= '/' . PLUGIN_CACHED_FILENAME_PREFIX . $id . '.img'
100 . ($plugincall ? '?args='.rawurlencode($plugincall) : '');
102 if ($request->getArg("start_debug"))
103 $url .= "&start_debug=1";
104 return array($id, $url);
108 * Replaces the abstract run method of WikiPlugin to implement
109 * a cache check which can avoid redundant runs.
110 * <b>Do not override this method in a subclass. Instead you may
111 * rename your run method to getHtml, getImage or getMap.
112 * Have a close look on the arguments and required return values,
116 * @param dbi WikiDB database abstraction class
117 * @param argstr string plugin arguments in the call from PhpWiki
118 * @param request Request ???
119 * @param string basepage Pagename to use to interpret links [/relative] page names.
120 * @return string HTML output to be printed to browser
126 function run($dbi, $argstr, &$request, $basepage) {
127 $cache = WikiPluginCached::newCache();
128 //$cacheparams = $GLOBALS['CacheParams'];
130 $sortedargs = $this->getArgs($argstr, $request);
131 if (is_array($sortedargs) )
133 $this->_args =& $sortedargs;
134 list($id,$url) = $this->genUrl($cache, $sortedargs);
136 // ---------- html and img gen. -----------------
137 if ($this->getPluginType() == PLUGIN_CACHED_IMG_ONDEMAND) {
138 return $this->embedImg($url, $dbi, $sortedargs, $request);
142 $content = $cache->get($id, 'imagecache');
143 switch($this->getPluginType()) {
144 case PLUGIN_CACHED_HTML:
145 if (!$content || !$content['html']) {
147 $content['html'] = $this->getHtml($dbi,$sortedargs,$request,$basepage);
148 if ($errortext = $this->getError()) {
149 WikiPluginCached::printError($errortext,'html');
155 case PLUGIN_CACHED_IMG_INLINE:
156 if (PLUGIN_CACHED_USECACHE && (!$content || !$content['image'])) {
157 $do_save = WikiPluginCached::produceImage($content, $this, $dbi, $sortedargs, $request, 'html');
158 $content['html'] = $do_save?$this->embedImg($url, $dbi, $sortedargs, $request) : false;
161 case PLUGIN_CACHED_MAP:
162 if (!$content || !$content['image'] || !$content['html'] ) {
163 $do_save = WikiPluginCached::produceImage($content, $this, $dbi, $sortedargs, $request, 'html');
164 $content['html'] = $do_save?WikiPluginCached::embedMap($id,
165 $url,$content['html'],$dbi,$sortedargs,$request):false;
170 $expire = $this->getExpire($dbi,$sortedargs,$request);
171 $cache->save($id, $content, $expire,'imagecache');
173 if ($content['html'])
174 return $content['html'];
179 /* --------------------- virtual or abstract functions ----------- */
182 * Sets the type of the plugin to html, image or map
186 * @return int determines the plugin to produce either html,
187 * an image or an image map; uses on of the
188 * following predefined values
190 * <li>PLUGIN_CACHED_HTML</li>
191 * <li>PLUGIN_CACHED_IMG_INLINE</li>
192 * <li>PLUGIN_CACHED_IMG_ONDEMAND</li>
193 * <li>PLUGIN_CACHED_MAP</li>
196 function getPluginType() {
197 return PLUGIN_CACHED_IMG_ONDEMAND;
201 * Creates an image handle from the given user arguments.
202 * This method is only called if the return value of
203 * <code>getPluginType</code> is set to
204 * PLUGIN_CACHED_IMG_INLINE or PLUGIN_CACHED_IMG_ONDEMAND.
206 * @access protected pure virtual
207 * @param dbi WikiDB database abstraction class
208 * @param argarray array complete (!) arguments to produce
209 * image. It is not necessary to call
210 * WikiPlugin->getArgs anymore.
211 * @param request Request ???
212 * @return imagehandle image handle if successful
213 * false if an error occured
215 function getImage($dbi,$argarray,$request) {
216 trigger_error('WikiPluginCached::getImage: pure virtual function in file '
217 . __FILE__ . ' line ' . __LINE__, E_USER_ERROR);
222 * Sets the life time of a cache entry in seconds.
223 * Expired entries are not used anymore.
224 * During a garbage collection each expired entry is
225 * removed. If removing all expired entries is not
226 * sufficient, the expire time is ignored and removing
227 * is determined by the last "touch" of the entry.
229 * @access protected virtual
230 * @param dbi WikiDB database abstraction class
231 * @param argarray array complete (!) arguments. It is
232 * not necessary to call
233 * WikiPlugin->getArgs anymore.
234 * @param request Request ???
235 * @return string format: '+seconds'
238 function getExpire($dbi,$argarray,$request) {
239 return '0'; // persist forever
243 * Decides the image type of an image output.
244 * Always used unless plugin type is PLUGIN_CACHED_HTML.
246 * @access protected virtual
247 * @param dbi WikiDB database abstraction class
248 * @param argarray array complete (!) arguments. It is
249 * not necessary to call
250 * WikiPlugin->getArgs anymore.
251 * @param request Request ???
252 * @return string 'png', 'jpeg' or 'gif'
254 function getImageType(&$dbi, $argarray, &$request) {
255 if (in_array($argarray['imgtype'], preg_split('/\s*:\s*/', PLUGIN_CACHED_IMGTYPES)))
256 return $argarray['imgtype'];
262 * Produces the alt text for an image.
263 * <code> <img src=... alt="getAlt(...)"> </code>
265 * @access protected virtual
266 * @param dbi WikiDB database abstraction class
267 * @param argarray array complete (!) arguments. It is
268 * not necessary to call
269 * WikiPlugin->getArgs anymore.
270 * @param request Request ???
271 * @return string "alt" description of the image
273 function getAlt($dbi,$argarray,$request) {
274 return '<?plugin '.$this->getName().' '.$this->glueArgs($argarray).'?>';
278 * Creates HTML output to be cached.
279 * This method is only called if the plugin_type is set to
280 * PLUGIN_CACHED_HTML.
282 * @access protected pure virtual
283 * @param dbi WikiDB database abstraction class
284 * @param argarray array complete (!) arguments to produce
285 * image. It is not necessary to call
286 * WikiPlugin->getArgs anymore.
287 * @param request Request ???
288 * @param string $basepage Pagename to use to interpret links [/relative] page names.
289 * @return string html to be printed in place of the plugin command
290 * false if an error occured
292 function getHtml($dbi, $argarray, $request, $basepage) {
293 trigger_error('WikiPluginCached::getHtml: pure virtual function in file '
294 . __FILE__ . ' line ' . __LINE__, E_USER_ERROR);
298 * Creates HTML output to be cached.
299 * This method is only called if the plugin_type is set to
300 * PLUGIN_CACHED_HTML.
302 * @access protected pure virtual
303 * @param dbi WikiDB database abstraction class
304 * @param argarray array complete (!) arguments to produce
305 * image. It is not necessary to call
306 * WikiPlugin->getArgs anymore.
307 * @param request Request ???
308 * @return array(html,handle) html for the map interior (to be specific,
309 * only <area;> tags defining hot spots)
310 * handle is an imagehandle to the corresponding
312 * array(false,false) if an error occured
314 function getMap($dbi, $argarray, $request) {
315 trigger_error('WikiPluginCached::getHtml: pure virtual function in file '
316 . __FILE__ . ' line ' . __LINE__, E_USER_ERROR);
319 /* --------------------- produce Html ----------------------------- */
322 * Creates an HTML map hyperlinked to the image specified
323 * by url and containing the hotspots given by map.
326 * @param id string unique id for the plugin call
327 * @param url string url pointing to the image part of the map
328 * @param map string <area> tags defining active
330 * @param dbi WikiDB database abstraction class
331 * @param argarray array complete (!) arguments to produce
332 * image. It is not necessary to call
333 * WikiPlugin->getArgs anymore.
334 * @param request Request ???
335 * @return string html output
337 function embedMap($id,$url,$map,$dbi,$argarray,$request) {
338 // id is not unique if the same map is produced twice
339 $key = substr($id,0,8).substr(microtime(),0,6);
340 return HTML(HTML::map(array( 'name' => $key ), $map ),
343 // 'alt' => htmlspecialchars($this->getAlt($dbi,$argarray,$request))
344 'usemap' => '#'.$key ))
349 * Creates an HTML <img> tag hyperlinking to the specified
350 * url and produces an alternative text for non-graphical
354 * @param url string url pointing to the image part of the map
355 * @param map string <area> tags defining active
357 * @param dbi WikiDB database abstraction class
358 * @param argarray array complete (!) arguments to produce
359 * image. It is not necessary to call
360 * WikiPlugin->getArgs anymore.
361 * @param request Request ???
362 * @return string html output
364 function embedImg($url,$dbi,$argarray,$request) {
365 return HTML::img( array(
367 'alt' => htmlspecialchars($this->getAlt($dbi,$argarray,$request)) ) );
371 // --------------------------------------------------------------------------
372 // ---------------------- static member functions ---------------------------
373 // --------------------------------------------------------------------------
376 * Creates one static PEAR Cache object and returns copies afterwards.
377 * FIXME: There should be references returned
379 * @access static protected
380 * @return Cache copy of the cache object
382 function newCache() {
385 if (!is_object($staticcache)) {
386 if (!class_exists('Cache')) {
387 // uuh, pear not in include_path! should print a warning.
388 // search some possible pear paths.
389 $pearFinder = new PearFileFinder;
390 if ($lib = $pearFinder->findFile('Cache.php', 'missing_ok'))
392 else // fall back to our own copy
393 require_once('lib/pear/Cache.php');
395 $cacheparams = array();
396 foreach (explode(':','database:cache_dir:filename_prefix:highwater:lowwater'
397 .':maxlifetime:maxarglen:usecache:force_syncmap') as $key) {
398 $cacheparams[$key] = constant('PLUGIN_CACHED_'.strtoupper($key));
400 $cacheparams['imgtypes'] = preg_split('/\s*:\s*/', PLUGIN_CACHED_IMGTYPES);
401 $staticcache = new Cache(PLUGIN_CACHED_DATABASE, $cacheparams);
402 $staticcache->gc_maxlifetime = PLUGIN_CACHED_MAXLIFETIME;
404 if (! PLUGIN_CACHED_USECACHE ) {
405 $staticcache->setCaching(false);
408 return $staticcache; // FIXME: use references ?
412 * Determines whether a needed image type may is available
413 * from the GD library and gives an alternative otherwise.
415 * @access public static
416 * @param wish string one of 'png', 'gif', 'jpeg', 'jpg'
417 * @return string the image type to be used ('png', 'gif', 'jpeg')
418 * 'html' in case of an error
421 function decideImgType($wish) {
422 if ($wish=='html') return $wish;
423 if ($wish=='jpg') { $wish = 'jpeg'; }
425 $supportedtypes = array();
426 // Todo: swf, pdf, ...
433 /* // these do work but not with the ImageType bitmask
440 $presenttypes = ImageTypes();
441 foreach($imagetypes as $imgtype => $bitmask)
442 if ( $presenttypes && $bitmask )
443 array_push($supportedtypes, $imgtype);
445 if (in_array($wish, $supportedtypes))
447 elseif (!empty($supportedtypes))
448 return reset($supportedtypes);
456 * Writes an image into a file or to the browser.
457 * Note that there is no check if the image can
460 * @access public static
461 * @param imgtype string 'png', 'gif' or 'jpeg'
462 * @param imghandle string image handle containing the image
463 * @param imgfile string file name of the image to be produced
465 * @see decideImageType
467 function writeImage($imgtype, $imghandle, $imgfile=false) {
468 if ($imgtype != 'html') {
469 $func = "Image" . strtoupper($imgtype);
471 $func($imghandle,$imgfile);
480 * Sends HTTP Header for some predefined file types.
481 * There is no parameter check.
483 * @access public static
484 * @param doctype string 'gif', 'png', 'jpeg', 'html'
487 function writeHeader($doctype) {
488 static $IMAGEHEADER = array(
489 'gif' => 'Content-type: image/gif',
490 'png' => 'Content-type: image/png',
491 'jpeg' => 'Content-type: image/jpeg',
492 'xbm' => 'Content-type: image/xbm',
493 'xpm' => 'Content-type: image/xpm',
494 'gd' => 'Content-type: image/gd',
495 'gd2' => 'Content-type: image/gd2',
496 'wbmp' => 'Content-type: image/vnd.wap.wbmp', // wireless bitmaps for PDA's and such.
497 'html' => 'Content-type: text/html' );
499 Header($IMAGEHEADER[$doctype]);
504 * Converts argument array to a string of format option="value".
505 * This should only be used for displaying plugin options for
506 * the quoting of arguments is not safe, yet.
508 * @access public static
509 * @param argarray array contains all arguments to be converted
510 * @return string concated arguments
512 function glueArgs($argarray) {
513 if (!empty($argarray)) {
515 while (list($key,$value)=each($argarray)) {
516 $argstr .= $key. '=' . '"' . $value . '" ';
517 // FIXME FIXME: How are values quoted? Can a value contain " ?
519 return substr($argstr,0,strlen($argstr)-1);
524 // ---------------------- FetchImageFromCache ------------------------------
527 * Extracts the cache entry id from the url and the plugin call
528 * parameters if available.
530 * @access private static
531 * @param id string return value. Image is stored under this id.
532 * @param plugincall string return value. Only returned if present in url.
533 * Contains all parameters to reconstruct
535 * @param cache Cache PEAR Cache object
536 * @param request Request ???
537 * @param errorformat string format which should be used to
538 * output errors ('html', 'png', 'gif', 'jpeg')
539 * @return boolean false if an error occurs, true otherwise.
540 * Param id and param plugincall are
541 * also return values.
543 function checkCall1(&$id, &$plugincall,$cache,$request, $errorformat) {
544 $id=$request->getArg('id');
545 $plugincall=rawurldecode($request->getArg('args'));
549 // This should never happen, so do not gettextify.
550 $errortext = "Neither 'args' nor 'id' given. Cannot proceed without parameters.";
551 WikiPluginCached::printError($errorformat, $errortext);
554 $id = $cache->generateId( $plugincall );
562 * Extracts the parameters necessary to reconstruct the plugin
563 * call needed to produce the requested image.
565 * @access static private
566 * @param plugincall string reference to serialized array containing both
567 * name and parameters of the plugin call
568 * @param request Request ???
569 * @return boolean false if an error occurs, true otherwise.
572 function checkCall2(&$plugincall,$request) {
573 // if plugincall wasn't sent by URL, it must have been
574 // stored in a session var instead and we can retreive it from there
576 if (!$plugincall=$request->getSessionVar('imagecache'.$id)) {
577 // I think this is the only error which may occur
578 // without having written bad code. So gettextify it.
579 $errortext = sprintf(
580 gettext ("There is no image creation data available to id '%s'. Please reload referring page." ),
582 WikiPluginCached::printError($errorformat, $errortext);
586 $plugincall = unserialize($plugincall);
592 * Creates an image or image map depending on the plugin type.
593 * @access static private
594 * @param content array reference to created array which overwrite the keys
595 * 'image', 'imagetype' and possibly 'html'
596 * @param plugin WikiPluginCached plugin which is called to create image or map
597 * @param dbi WikiDB handle to database
598 * @param argarray array Contains all arguments needed by plugin
599 * @param request Request ????
600 * @param errorformat string outputs errors in 'png', 'gif', 'jpg' or 'html'
601 * @return boolean error status; true=ok; false=error
603 function produceImage(&$content, $plugin, $dbi, $argarray, $request, $errorformat) {
604 $plugin->resetError();
605 $content['html'] = $imagehandle = false;
606 if ($plugin->getPluginType() == PLUGIN_CACHED_MAP ) {
607 list($imagehandle,$content['html']) = $plugin->getMap($dbi, $argarray, $request);
609 $imagehandle = $plugin->getImage($dbi, $argarray, $request);
612 $content['imagetype']
613 = WikiPluginCached::decideImgType($plugin->getImageType($dbi, $argarray, $request));
614 $errortext = $plugin->getError();
616 if (!$imagehandle||$errortext) {
618 $errortext = "'<?plugin ".$plugin->getName(). ' '
619 . WikiPluginCached::glueArgs($argarray)." ?>' returned no image, "
620 . " although no error was reported.";
622 WikiPluginCached::printError($errorformat, $errortext);
626 // image handle -> image data
627 //$cacheparams = $GLOBALS['CacheParams'];
628 $tmpfile = $this->tempnam();
629 WikiPluginCached::writeImage($content['imagetype'], $imagehandle, $tmpfile);
630 ImageDestroy($imagehandle);
631 if (file_exists($tmpfile)) {
632 $fp = fopen($tmpfile,'rb');
633 $content['image'] = fread($fp,filesize($tmpfile));
636 if ($content['image'])
642 function tempnam($prefix = false) {
643 return tempnam(isWindows() ? str_replace('/', "\\", PLUGIN_CACHED_CACHE_DIR) : PLUGIN_CACHED_CACHE_DIR,
644 $prefix ? $prefix : PLUGIN_CACHED_FILENAME_PREFIX);
648 * Main function for obtaining images from cache or generating on-the-fly
649 * from parameters sent by url or session vars.
651 * @access static public
652 * @param dbi WikiDB handle to database
653 * @param request Request ???
654 * @param errorformat string outputs errors in 'png', 'gif', 'jpeg' or 'html'
656 function fetchImageFromCache($dbi,$request,$errorformat='png') {
657 $cache = WikiPluginCached::newCache();
658 $errorformat = WikiPluginCached::decideImgType($errorformat);
660 if (!WikiPluginCached::checkCall1($id,$plugincall,$cache,$request,$errorformat)) return false;
663 $content = $cache->get($id,'imagecache');
665 if ($content && $content['image']) {
666 WikiPluginCached::writeHeader($content['imagetype']);
667 print $content['image'];
671 // produce image, now. At first, we need plugincall parameters
672 if (!WikiPluginCached::checkCall2($plugincall,$request)) return false;
674 $pluginname = $plugincall['pluginname'];
675 $argarray = $plugincall['arguments'];
677 $loader = new WikiPluginLoader;
678 $plugin = $loader->getPlugin($pluginname);
680 // cache empty, but image maps have to be created _inline_
681 // so ask user to reload wiki page instead
682 //$cacheparams = $GLOBALS['CacheParams'];
683 if (($plugin->getPluginType() == PLUGIN_CACHED_MAP) && PLUGIN_CACHED_FORCE_SYNCMAP) {
684 $errortext = _("Image map expired. Reload wiki page to recreate its html part.");
685 WikiPluginCached::printError($errorformat, $errortext);
689 if (!WikiPluginCached::produceImage($content, $plugin, $dbi, $argarray,
690 $request, $errorformat) ) return false;
692 $expire = $plugin->getExpire($dbi,$argarray,$request);
694 if ($content['image']) {
695 $cache->save($id, $content, $expire,'imagecache');
696 WikiPluginCached::writeHeader($content['imagetype']);
697 print $content['image'];
701 $errortext = "Could not create image file from imagehandle.";
702 WikiPluginCached::printError($errorformat, $errortext);
704 } // FetchImageFromCache
706 // -------------------- error handling ----------------------------
709 * Resets buffer containing all error messages. This is allways
710 * done before invoking any abstract creation routines like
711 * <code>getImage</code>.
716 function resetError() {
717 $this->_errortext = '';
721 * Returns all accumulated error messages.
724 * @return string error messages printed with <code>complain</code>.
726 function getError() {
727 return $this->_errortext;
731 * Collects the error messages in a string for later output
732 * by WikiPluginCached. This should be used for any errors
733 * that occur during data (html,image,map) creation.
736 * @param addtext string errormessage to be printed (separate
737 * multiple lines with '\n')
740 function complain($addtext) {
741 $this->_errortext .= $addtext;
745 * Outputs the error as image if possible or as html text
746 * if wished or html header has already been sent.
748 * @access static protected
749 * @param imgtype string 'png', 'gif', 'jpeg' or 'html'
750 * @param errortext string guess what?
753 function printError($imgtype, $errortext) {
754 $imgtype = WikiPluginCached::decideImgType($imgtype);
756 $talkedallready = ob_get_contents() || headers_sent();
757 if (($imgtype=='html') || $talkedallready) {
758 trigger_error($errortext, E_USER_WARNING);
760 $red = array(255,0,0);
761 $grey = array(221,221,221);
762 $im = WikiPluginCached::text2img($errortext, 2, $red, $grey);
764 trigger_error($errortext, E_USER_WARNING);
767 WikiPluginCached::writeHeader($imgtype);
768 WikiPluginCached::writeImage($imgtype, $im);
775 * Basic text to image converter for error handling which allows
776 * multiple line output.
777 * It will only output the first 25 lines of 80 characters. Both
778 * values may be smaller if the chosen font is to big for there
779 * is further restriction to 600 pixel in width and 350 in height.
781 * @access static public
782 * @param txt string multi line text to be converted
783 * @param fontnr integer number (1-5) telling gd which internal font to use;
784 * I recommend font 2 for errors and 4 for help texts.
785 * @param textcol array text color as a list of the rgb components; array(red,green,blue)
786 * @param bgcol array background color; array(red,green,blue)
787 * @return string image handle for gd routines
789 function text2img($txt,$fontnr,$textcol,$bgcol) {
790 // basic (!) output for error handling
793 if ($fontnr<1 || $fontnr>5) {
796 if (!is_array($textcol) || !is_array($bgcol)) {
797 $textcol = array(0,0,0);
798 $bgcol = array(255,255,255);
800 foreach( array_merge($textcol,$bgcol) as $component) {
801 if ($component<0 || $component > 255) {
802 $textcol = array(0,0,0);
803 $bgcol = array(255,255,255);
808 // prepare Parameters
810 // set maximum values
817 $charx = ImageFontWidth($fontnr);
818 $chary = ImageFontHeight($fontnr);
820 $marginy = floor($chary/2);
822 $IMAGESIZE['cols'] = min($IMAGESIZE['cols'], floor(($IMAGESIZE['width'] - 2*$marginx )/$charx));
823 $IMAGESIZE['rows'] = min($IMAGESIZE['rows'], floor(($IMAGESIZE['height'] - 2*$marginy )/$chary));
830 $npos = strpos($txt, "\n");
833 $breaklen = min($IMAGESIZE['cols'],$len);
835 $breaklen = min($npos+1, $IMAGESIZE['cols']);
837 $lines[$y] = chop(substr($txt, 0, $breaklen));
838 $wx = max($wx,strlen($lines[$y++]));
839 $txt = substr($txt, $breaklen);
840 } while ($txt && ($y < $IMAGESIZE['rows']));
842 // recalculate image size
843 $IMAGESIZE['rows'] = $y;
844 $IMAGESIZE['cols'] = $wx;
846 $IMAGESIZE['width'] = $IMAGESIZE['cols'] * $charx + 2*$marginx;
847 $IMAGESIZE['height'] = $IMAGESIZE['rows'] * $chary + 2*$marginy;
849 // create blank image
850 $im = @ImageCreate($IMAGESIZE['width'],$IMAGESIZE['height']);
852 $col = ImageColorAllocate($im, $textcol[0], $textcol[1], $textcol[2]);
853 $bg = ImageColorAllocate($im, $bgcol[0], $bgcol[1], $bgcol[2]);
855 ImageFilledRectangle($im, 0, 0, $IMAGESIZE['width']-1, $IMAGESIZE['height']-1, $bg);
858 foreach($lines as $nr => $textstr) {
859 ImageString( $im, $fontnr, $marginx, $marginy+$nr*$chary,
865 } // WikiPluginCached
868 // $Log: not supported by cvs2svn $
875 // c-hanging-comment-ender-p: nil
876 // indent-tabs-mode: nil