00001 <?php
00002 /***************************************************************
00003 *  Copyright notice
00004 *
00005 *  (c) 1999-2005 Kasper Skaarhoj (kasperYYYY@typo3.com)
00006 *  All rights reserved
00007 *
00008 *  This script is part of the TYPO3 project. The TYPO3 project is
00009 *  free software; you can redistribute it and/or modify
00010 *  it under the terms of the GNU General Public License as published by
00011 *  the Free Software Foundation; either version 2 of the License, or
00012 *  (at your option) any later version.
00013 *
00014 *  The GNU General Public License can be found at
00015 *  http://www.gnu.org/copyleft/gpl.html.
00016 *  A copy is found in the textfile GPL.txt and important notices to the license
00017 *  from the author is found in LICENSE.txt distributed with these scripts.
00018 *
00019 *
00020 *  This script is distributed in the hope that it will be useful,
00021 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00022 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00023 *  GNU General Public License for more details.
00024 *
00025 *  This copyright notice MUST APPEAR in all copies of the script!
00026 ***************************************************************/
00102 class tslib_gifBuilder extends t3lib_stdGraphic {
00103 
00104                 // Internal
00105         var $im = '';           // the main image
00106         var $w = 0;                     // the image-width
00107         var $h = 0;                     // the image-height
00108         var $map;                       // map-data
00109         var $workArea;
00110         var $setup = Array ();          // This holds the operational setup for gifbuilder. Basically this is a TypoScript array with properties.
00111         var $combinedTextStrings = array();             // Contains all text strings used on this image
00112         var $combinedFileNames = array();               // Contains all filenames (basename without extension) used on this image
00113         var $data = Array();            // This is the array from which data->field: [key] is fetched. So this is the current record!
00114         var $objBB = Array();
00115         var $myClassName = 'gifbuilder';
00116         var $charRangeMap=array();
00117 
00129         function start($conf,$data)     {
00130 
00131                 if (is_array($conf))    {
00132                         $this->setup = $conf;
00133                         $this->data = $data;
00134 
00135 
00136                         /* Hook preprocess gifbuilder conf
00137                          * Added by Julle for 3.8.0
00138                          *
00139                          * Let's you pre-process the gifbuilder configuration. for
00140                          * example you can split a string up into lines and render each
00141                          * line as TEXT obj, see extension julle_gifbconf
00142                          */
00143 
00144                         if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_gifbuilder.php']['gifbuilder-ConfPreProcess']))    {
00145                                 foreach($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_gifbuilder.php']['gifbuilder-ConfPreProcess'] as $_funcRef)    {
00146                                         $_params = $this->setup;
00147                                         $this->setup = t3lib_div::callUserFunction($_funcRef,$_params,$this);
00148                                 }
00149                         }
00150 
00151                                 // Initializing global Char Range Map
00152                         $this->charRangeMap = array();
00153                         if (is_array($GLOBALS['TSFE']->tmpl->setup['_GIFBUILDER.']['charRangeMap.']))   {
00154                                 foreach($GLOBALS['TSFE']->tmpl->setup['_GIFBUILDER.']['charRangeMap.'] as $cRMcfgkey => $cRMcfg)        {
00155                                         if (is_array($cRMcfg))  {
00156 
00157                                                         // Initializing:
00158                                                 $cRMkey = $GLOBALS['TSFE']->tmpl->setup['_GIFBUILDER.']['charRangeMap.'][substr($cRMcfgkey,0,-1)];
00159                                                 $this->charRangeMap[$cRMkey] = array();
00160                                                 $this->charRangeMap[$cRMkey]['charMapConfig'] =  $cRMcfg['charMapConfig.'];
00161                                                 $this->charRangeMap[$cRMkey]['cfgKey'] = substr($cRMcfgkey,0,-1);
00162                                                 $this->charRangeMap[$cRMkey]['multiplicator'] = (double)$cRMcfg['fontSizeMultiplicator'];
00163                                                 $this->charRangeMap[$cRMkey]['pixelSpace'] = intval($cRMcfg['pixelSpaceFontSizeRef']);
00164                                         }
00165                                 }
00166                         }
00167 
00168                                 // Getting sorted list of TypoScript keys from setup.
00169                         $sKeyArray=t3lib_TStemplate::sortedKeyList($this->setup);
00170 
00171                                 // Setting the background color, passing it through stdWrap
00172                         if ($conf['backColor.'] || $conf['backColor'])  {
00173                                 $cObj =t3lib_div::makeInstance('tslib_cObj');
00174                                 $cObj->start($this->data);
00175                                 $this->setup['backColor'] = trim($cObj->stdWrap($this->setup['backColor'], $this->setup['backColor.']));
00176                         }
00177                         if (!$this->setup['backColor']) { $this->setup['backColor']='white'; }
00178 
00179                         if ($conf['transparentColor.'] || $conf['transparentColor'])    {
00180                                 $cObj =t3lib_div::makeInstance('tslib_cObj');
00181                                 $cObj->start($this->data);
00182                                 $this->setup['transparentColor_array'] = explode('|', trim($cObj->stdWrap($this->setup['transparentColor'], $this->setup['transparentColor.'])));
00183                         }
00184 
00185                                 // Transparency does not properly work when, GIFs or 8-bit PNGs are generated or reduceColors is set -- disable truecolor flag so they get generated "natively" in 8-bit.
00186                                 // not working with reduceColors and truecolor images
00187                         if (($this->setup['transparentBackground'] || is_array($this->setup['transparentColor_array'])) && ($this->gifExtension=='gif' || !$this->png_truecolor || isset($this->setup['reduceColors'])))        {
00188                                 $this->truecolor = false;
00189                         }
00190 
00191                                 // Set default dimensions
00192                         if (!$this->setup['XY'])        {$this->setup['XY']='120,50';}
00193 
00194 
00195                                 // Checking TEXT and IMAGE objects for files. If any errors the objects are cleared.
00196                                 // The Bounding Box for the objects is stored in an array
00197                         foreach($sKeyArray as $theKey) {
00198                                 $theValue = $this->setup[$theKey];
00199 
00200                                 if (intval($theKey) && $conf=$this->setup[$theKey.'.']) {
00201                                                 // Swipes through TEXT and IMAGE-objects
00202                                         switch($theValue)       {
00203                                                 case 'TEXT':
00204                                                         if ($this->setup[$theKey.'.'] = $this->checkTextObj($conf))     {
00205 
00206                                                                         // Adjust font width if max size is set:
00207                                                                 if ($this->setup[$theKey.'.']['maxWidth'])      {
00208                                                                         $this->setup[$theKey.'.']['fontSize'] = $this->fontResize($this->setup[$theKey.'.']); //RTF - this has to be done before calcBBox
00209                                                                 }
00210 
00211                                                                         // Calculate bounding box:
00212                                                                 $txtInfo=$this->calcBBox($this->setup[$theKey.'.']);
00213                                                                 $this->setup[$theKey.'.']['BBOX'] = $txtInfo;
00214                                                                 $this->objBB[$theKey] = $txtInfo;
00215                                                                 $this->setup[$theKey.'.']['imgMap'] = 0;
00216                                                         }
00217                                                 break;
00218                                                 case 'IMAGE':
00219                                                         $fileInfo = $this->getResource($conf['file'],$conf['file.']);
00220                                                         if ($fileInfo)  {
00221                                                                 $this->combinedFileNames[] = ereg_replace('\.[[:alnum:]]+$','',basename($fileInfo[3]));
00222                                                                 $this->setup[$theKey.'.']['file'] = $fileInfo[3];
00223                                                                 $this->setup[$theKey.'.']['BBOX'] = $fileInfo;
00224                                                                 $this->objBB[$theKey] = $fileInfo;
00225                                                                 if ($conf['mask'])      {
00226                                                                         $maskInfo = $this->getResource($conf['mask'],$conf['mask.']);
00227                                                                         if ($maskInfo)  {
00228                                                                                 $this->setup[$theKey.'.']['mask'] = $maskInfo[3];
00229                                                                         } else {
00230                                                                                 $this->setup[$theKey.'.']['mask'] = '';
00231                                                                         }
00232                                                                 }
00233                                                         } else {
00234                                                                 unset($this->setup[$theKey.'.']);
00235                                                         }
00236                                                 break;
00237                                         }
00238                                                 // Checks if disabled is set... (this is also done in menu.php / imgmenu!!)
00239                                         if ($conf['if.'])       {
00240                                                 $cObj =t3lib_div::makeInstance('tslib_cObj');
00241                                                 $cObj->start($this->data);
00242 
00243                                                 if (!$cObj->checkIf($conf['if.']))      {
00244                                                         unset($this->setup[$theKey]);
00245                                                         unset($this->setup[$theKey.'.']);
00246                                                 }
00247                                         }
00248                                 }
00249                         }
00250 
00251                                 // Calculate offsets on elements
00252                         $this->setup['XY'] = $this->calcOffset($this->setup['XY']);
00253                         $this->setup['offset'] = $this->calcOffset($this->setup['offset']);
00254                         $this->setup['workArea'] = $this->calcOffset($this->setup['workArea']);
00255 
00256                         foreach ($sKeyArray as $theKey) {
00257                                 $theValue=$this->setup[$theKey];
00258 
00259                                 if (intval($theKey) && $conf=$this->setup[$theKey.'.']) {
00260                                         switch($theValue)       {
00261                                                 case 'TEXT':
00262                                                 case 'IMAGE':
00263                                                         if ($this->setup[$theKey.'.']['offset'])        {
00264                                                                 $this->setup[$theKey.'.']['offset'] = $this->calcOffset($this->setup[$theKey.'.']['offset']);
00265                                                         }
00266                                                 break;
00267                                                 case 'BOX':
00268                                                         if ($this->setup[$theKey.'.']['dimensions'])    {
00269                                                                 $this->setup[$theKey.'.']['dimensions'] = $this->calcOffset($this->setup[$theKey.'.']['dimensions']);
00270                                                         }
00271                                                 break;
00272                                                 case 'WORKAREA':
00273                                                         if ($this->setup[$theKey.'.']['set'])   {
00274                                                                 $this->setup[$theKey.'.']['set'] = $this->calcOffset($this->setup[$theKey.'.']['set']);
00275                                                         }
00276                                                 break;
00277                                                 case 'CROP':
00278                                                         if ($this->setup[$theKey.'.']['crop'])  {
00279                                                                 $this->setup[$theKey.'.']['crop'] = $this->calcOffset($this->setup[$theKey.'.']['crop']);
00280                                                         }
00281                                                 break;
00282                                                 case 'SCALE':
00283                                                         if ($this->setup[$theKey.'.']['width']) {
00284                                                                 $this->setup[$theKey.'.']['width'] = $this->calcOffset($this->setup[$theKey.'.']['width']);
00285                                                         }
00286                                                         if ($this->setup[$theKey.'.']['height'])        {
00287                                                                 $this->setup[$theKey.'.']['height'] = $this->calcOffset($this->setup[$theKey.'.']['height']);
00288                                                         }
00289                                                 break;
00290                                         }
00291                                 }
00292                         }
00293                                 // Get trivial data
00294                         $XY = t3lib_div::intExplode(',',$this->setup['XY']);
00295                         $maxWidth = intval($this->setup['maxWidth']);
00296                         $maxHeight = intval($this->setup['maxHeight']);
00297 
00298                         $XY[0] = t3lib_div::intInRange($XY[0],1, $maxWidth?$maxWidth:2000);
00299                         $XY[1] = t3lib_div::intInRange($XY[1],1, $maxHeight?$maxHeight:2000);
00300                         $this->XY = $XY;
00301                         $this->w = $XY[0];
00302                         $this->h = $XY[1];
00303                         $this->OFFSET = t3lib_div::intExplode(',',$this->setup['offset']);
00304 
00305                         $this->setWorkArea($this->setup['workArea']);   // this sets the workArea
00306                         $this->defaultWorkArea = $this->workArea;       // this sets the default to the current;
00307                 }
00308         }
00309 
00318         function gifBuild()     {
00319                 if ($this->setup)       {
00320                         $gifFileName = $this->fileName('GB/');  // Relative to PATH_site
00321                         if (!@file_exists($gifFileName))        {               // File exists
00322 
00323                                         // Create temporary directory if not done:
00324                                 $this->createTempSubDir('GB/');
00325 
00326                                         // Create file:
00327                                 $this->make();
00328                                 $this->output($gifFileName);
00329                                 $this->destroy();
00330                         }
00331                         return $gifFileName;
00332                 }
00333         }
00334 
00346         function make() {
00347                         // Get trivial data
00348                 $XY = $this->XY;
00349 
00350                         // Gif-start
00351                 $this->im = $this->imagecreate($XY[0],$XY[1]);
00352                 $this->w = $XY[0];
00353                 $this->h = $XY[1];
00354 
00355                         // backColor is set
00356                 $BGcols = $this->convertColor($this->setup['backColor']);
00357                 $Bcolor = ImageColorAllocate($this->im, $BGcols[0],$BGcols[1],$BGcols[2]);
00358                 ImageFilledRectangle($this->im, 0, 0, $XY[0], $XY[1], $Bcolor);
00359 
00360                         // Traverse the GIFBUILDER objects an render each one:
00361                 if (is_array($this->setup))     {
00362                         $sKeyArray=t3lib_TStemplate::sortedKeyList($this->setup);
00363                         foreach($sKeyArray as $theKey)  {
00364                                 $theValue=$this->setup[$theKey];
00365 
00366                                 if (intval($theKey) && $conf=$this->setup[$theKey.'.']) {
00367                                         switch($theValue)       {
00368                                                         // Images
00369                                                 case 'IMAGE':
00370                                                         if ($conf['mask'])      {
00371                                                                 $this->maskImageOntoImage($this->im,$conf,$this->workArea);
00372                                                         } else {
00373                                                                 $this->copyImageOntoImage($this->im,$conf,$this->workArea);
00374                                                         }
00375                                                 break;
00376 
00377                                                         // Text
00378                                                 case 'TEXT':
00379                                                         if (!$conf['hide'])     {
00380                                                                 if (is_array($conf['shadow.'])) {
00381                                                                         $this->makeShadow($this->im,$conf['shadow.'],$this->workArea,$conf);
00382                                                                 }
00383                                                                 if (is_array($conf['emboss.'])) {
00384                                                                         $this->makeEmboss($this->im,$conf['emboss.'],$this->workArea,$conf);
00385                                                                 }
00386                                                                 if (is_array($conf['outline.']))        {
00387                                                                         $this->makeOutline($this->im,$conf['outline.'],$this->workArea,$conf);
00388                                                                 }
00389                                                                 $conf['imgMap']=1;
00390                                                                 $this->makeText($this->im,$conf,$this->workArea);
00391                                                         }
00392                                                 break;
00393 
00394                                                         // Text effects:
00395                                                 case 'OUTLINE':
00396                                                         if ($this->setup[$conf['textObjNum']]=='TEXT' && $txtConf=$this->checkTextObj($this->setup[$conf['textObjNum'].'.']))   {
00397                                                                 $this->makeOutline($this->im,$conf,$this->workArea,$txtConf);
00398                                                         }
00399                                                 break;
00400                                                 case 'EMBOSS':
00401                                                         if ($this->setup[$conf['textObjNum']]=='TEXT' && $txtConf=$this->checkTextObj($this->setup[$conf['textObjNum'].'.']))   {
00402                                                                 $this->makeEmboss($this->im,$conf,$this->workArea,$txtConf);
00403                                                         }
00404                                                 break;
00405                                                 case 'SHADOW':
00406                                                         if ($this->setup[$conf['textObjNum']]=='TEXT' && $txtConf=$this->checkTextObj($this->setup[$conf['textObjNum'].'.']))   {
00407                                                                 $this->makeShadow($this->im,$conf,$this->workArea,$txtConf);
00408                                                         }
00409                                                 break;
00410 
00411                                                         // Other
00412                                                 case 'BOX':
00413                                                         $this->makeBox($this->im,$conf,$this->workArea);
00414                                                 break;
00415                                                 case 'EFFECT':
00416                                                         $this->makeEffect($this->im,$conf);
00417                                                 break;
00418                                                 case 'ADJUST':
00419                                                         $this->adjust($this->im,$conf);
00420                                                 break;
00421                                                 case 'CROP':
00422                                                         $this->crop($this->im,$conf);
00423                                                 break;
00424                                                 case 'SCALE':
00425                                                         $this->scale($this->im,$conf);
00426                                                 break;
00427                                                 case 'WORKAREA':
00428                                                         if ($conf['set'])       {
00429                                                                 $this->setWorkArea($conf['set']);       // this sets the workArea
00430                                                         }
00431                                                         if (isset($conf['clear']))      {
00432                                                                 $this->workArea = $this->defaultWorkArea;       // this sets the current to the default;
00433                                                         }
00434                                                 break;
00435                                         }
00436                                 }
00437                         }
00438                 }
00439 
00440 
00441                 if ($this->setup['transparentBackground'])      {
00442                                 // Auto transparent background is set
00443                         $Bcolor = ImageColorExact($this->im, $BGcols[0],$BGcols[1],$BGcols[2]);
00444                         imagecolortransparent($this->im, $Bcolor);
00445                 } elseif (is_array($this->setup['transparentColor_array']))     {
00446                                 // Multiple transparent colors are set. This is done via the trick that all transparent colors get converted to one color and then this one gets set as transparent as png/gif can just have one transparent color.
00447                         $Tcolor = $this->unifyColors($this->im, $this->setup['transparentColor_array'], intval($this->setup['transparentColor.']['closest']));
00448                         if ($Tcolor>=0) {
00449                                 imagecolortransparent($this->im, $Tcolor);
00450                         }
00451                 }
00452 
00453         }
00454 
00455 
00456 
00457 
00458 
00459 
00460 
00461 
00462 
00463 
00464 
00465 
00466 
00467 
00468 
00469 
00470 
00471 
00472         /*********************************************
00473          *
00474          * Various helper functions
00475          *
00476          ********************************************/
00477 
00478 
00490         function checkTextObj($conf)    {
00491                 $conf['fontFile']=$this->checkFile($conf['fontFile']);
00492                 if (!$conf['fontFile']){$conf['fontFile']='t3lib/fonts/nimbus.ttf';}
00493                 if (!$conf['iterations']){$conf['iterations'] = 1;}
00494                 if (!$conf['fontSize']){$conf['fontSize']=12;}
00495                 if ($conf['spacing'] || $conf['wordSpacing'])   {               // If any kind of spacing applys, we cannot use angles!!
00496                         $conf['angle']=0;
00497                 }
00498                 if (!isset($conf['antiAlias'])){$conf['antiAlias']=1;}
00499                 $cObj =t3lib_div::makeInstance('tslib_cObj');
00500                 $cObj->start($this->data);
00501 
00502                 $conf['fontColor'] = trim($cObj->stdWrap($conf['fontColor'], $conf['fontColor.']));
00503                 $conf['text']=$cObj->stdWrap($conf['text'],$conf['text.']);
00504                         // Strip HTML
00505                 if (!$conf['doNotStripHTML'])   {
00506                         $conf['text'] = strip_tags($conf['text']);
00507                 }
00508                 $this->combinedTextStrings[] = strip_tags($conf['text']);
00509 
00510                         // Max length = 100
00511                 $tlen = intval($conf['textMaxLength']) ? intval($conf['textMaxLength']) : 100;
00512                 $conf['text'] = substr($conf['text'],0,$tlen);
00513                 if ((string)$conf['text']!='')  {
00514 
00515                                 // Char range map thingie:
00516                         $fontBaseName = basename($conf['fontFile']);
00517                         if (is_array($this->charRangeMap[$fontBaseName]))       {
00518 
00519                                         // Initialize splitRendering array:
00520                                 if (!is_array($conf['splitRendering.']))        {
00521                                         $conf['splitRendering.'] = array();
00522                                 }
00523 
00524                                 $cfgK = $this->charRangeMap[$fontBaseName]['cfgKey'];
00525                                 if (!isset($conf['splitRendering.'][$cfgK]))    {       // Do not impose settings if a splitRendering object already exists:
00526                                                 // Set configuration:
00527                                         $conf['splitRendering.'][$cfgK] = 'charRange';
00528                                         $conf['splitRendering.'][$cfgK.'.'] = $this->charRangeMap[$fontBaseName]['charMapConfig'];
00529 
00530                                                 // multiplicator of fontsize:
00531                                         if ($this->charRangeMap[$fontBaseName]['multiplicator'])        {
00532                                                 $conf['splitRendering.'][$cfgK.'.']['fontSize'] = round($conf['fontSize'] * $this->charRangeMap[$fontBaseName]['multiplicator']);
00533                                         }
00534                                                 // multiplicator of pixelSpace:
00535                                         if ($this->charRangeMap[$fontBaseName]['pixelSpace'])   {
00536                                                 $travKeys = array('xSpaceBefore','xSpaceAfter','ySpaceBefore','ySpaceAfter');
00537                                                 foreach($travKeys as $pxKey)    {
00538                                                         if (isset($conf['splitRendering.'][$cfgK.'.'][$pxKey])) {
00539                                                                 $conf['splitRendering.'][$cfgK.'.'][$pxKey] = round($conf['splitRendering.'][$cfgK.'.'][$pxKey] * ($conf['fontSize'] / $this->charRangeMap[$fontBaseName]['pixelSpace']));
00540                                                         }
00541                                                 }
00542                                         }
00543                                 }
00544                         }
00545                         if (is_array($conf['splitRendering.'])) {
00546                                 foreach($conf['splitRendering.'] as $key => $value)     {
00547                                         if (is_array($conf['splitRendering.'][$key]))   {
00548                                                 if (isset($conf['splitRendering.'][$key]['fontFile']))  {
00549                                                         $conf['splitRendering.'][$key]['fontFile'] = $this->checkFile($conf['splitRendering.'][$key]['fontFile']);
00550                                                 }
00551                                         }
00552                                 }
00553                         }
00554 
00555                         return $conf;
00556                 }
00557         }
00558 
00570         function calcOffset($string)    {
00571                 $numbers=explode(',',$string);
00572                 while(list($key,$val)=each($numbers))   {
00573                         $val = trim($val);
00574                         if ((string)$val==(string)intval($val)) {
00575                                 $value[$key]=intval($val);
00576                         } else {
00577                                 $parts= t3lib_div::splitCalc($val,'+-*/%');
00578                                 $value[$key]=0;
00579                                 reset($parts);
00580                                 while(list(,$part)=each($parts))        {
00581                                         $theVal = $part[1];
00582                                         $sign =  $part[0];
00583                                         if ((string)intval($theVal)==(string)$theVal)   {
00584                                                 $theVal = intval($theVal);
00585                                         } elseif ('['.substr($theVal,1,-1).']'==$theVal)        {
00586                                                 $objParts=explode('.',substr($theVal,1,-1));
00587                                                 $theVal=0;
00588                                                 if (isset($this->objBB[$objParts[0]]))  {
00589                                                         if ($objParts[1]=='w')  {$theVal=intval($this->objBB[$objParts[0]][0]);}
00590                                                         if ($objParts[1]=='h')  {$theVal=intval($this->objBB[$objParts[0]][1]);}
00591                                                 }
00592                                         } else {
00593                                                 $theVal =0;
00594                                         }
00595                                         if ($sign=='-') {$value[$key]-=$theVal;}
00596                                         if ($sign=='+') {$value[$key]+=$theVal;}
00597                                         if ($sign=='/') {if (intval($theVal)) $value[$key]/=intval($theVal);}
00598                                         if ($sign=='*') {$value[$key]*=$theVal;}
00599                                         if ($sign=='%') {if (intval($theVal)) $value[$key]%=intval($theVal);}
00600                                 }
00601                                 $value[$key]=intval($value[$key]);
00602                         }
00603                 }
00604                 $string = implode(',',$value);
00605                 return $string;
00606         }
00607 
00619         function getResource($file,$fileArray)  {
00620                 if (!t3lib_div::inList($this->imageFileExt, $fileArray['ext'])) {
00621                         $fileArray['ext'] = $this->gifExtension;
00622                 }
00623                 $cObj =t3lib_div::makeInstance('tslib_cObj');
00624                 $cObj->start($this->data);
00625                 return $cObj->getImgResource($file,$fileArray);
00626         }
00627 
00636         function checkFile($file)       {
00637                 return $GLOBALS['TSFE']->tmpl->getFileName($file);
00638         }
00639 
00647         function fileName($pre) {
00648 
00649                         // WARNING: In PHP5 I discovered that rendering with freetype of Japanese letters was totally corrupt. Not only the wrong glyphs are printed but also some memory stack overflow resulted in strange additional chars - and finally the reason for this investigation: The Bounding box data was changing all the time resulting in new images being generated all the time. With PHP4 it works fine.
00650                 return $this->tempPath.
00651                                 $pre.
00652                                 ($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix'] ? $GLOBALS['TSFE']->fileNameASCIIPrefix(implode('_',array_merge($this->combinedTextStrings,$this->combinedFileNames)),intval($GLOBALS['TSFE']->config['config']['meaningfulTempFilePrefix']),'_') : '').
00653                                 t3lib_div::shortMD5(serialize($this->setup)).
00654                                 '.'.$this->extension();
00655         }
00656 
00663         function extension() {
00664                 switch(strtolower($this->setup['format']))      {
00665                         case 'jpg':
00666                         case 'jpeg':
00667                                 return 'jpg';
00668                         break;
00669                         case 'png':
00670                                 return 'png';
00671                         break;
00672                         case 'gif':
00673                                 return 'gif';
00674                         break;
00675                         default:
00676                                 return $this->gifExtension;
00677                         break;
00678                 }
00679         }
00680 }
00681 
00682 
00683 if (defined('TYPO3_MODE') && $TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['tslib/class.tslib_gifbuilder.php'])        {
00684         include_once($TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['tslib/class.tslib_gifbuilder.php']);
00685 }
00686 
00687 ?>