PHP: imagecopyresampled results in part black images

When using imagecopyresampled parts of the destination images was black. I solved this by using a script found on PHP.net that increases the memory limit for PHP, since large source images requires large amount of memory.

I did some modifications though, since I wanted the script to work for jpeg, gif and png, and I also returned the original memory limit for the script so that it would be easy to restore the memory limits after the image processing.

Anyway, here's the script:

    /**
     * Increases the memory limit for PHP so that images can be loaded
     *
     * @param string $filename - full path to the image file to be used
     * @return int - old memory limit so that you can restore the memory limit after image processing
     */
    function _memorySize($filename){
      $imageInfo = getimagesize($filename);

      if(strpos($filename,'.jpg')===false){
       $imageInfo['bits']=24;
       $imageInfo['channels']=16;
      }
  $MB = Pow(1024,2);   // number of bytes in 1M
  $K64 = Pow(2,16);    // number of bytes in 64K
  $TWEAKFACTOR = 1.8;   // Or whatever works for you
  $memoryNeeded = round( ( $imageInfo[0] * $imageInfo[1]
                                          * $imageInfo['bits']
                                          * $imageInfo['channels'] / 8
                            + $K64
                          ) * $TWEAKFACTOR
                       );
  $memoryHave = memory_get_usage();
  $memoryLimitMB = (integer) ini_get('memory_limit');
  $memoryLimit = $memoryLimitMB * $MB;
  if ( function_exists('memory_get_usage') 
       && (($memoryHave + $memoryNeeded) < $memoryLimit) 
     ) {
     $newLimit = $memoryLimitMB + ceil( ( $memoryHave 
                                        + $memoryNeeded 
                                        - $memoryLimit 
                                        ) / $MB 
                                      );
     ini_set( 'memory_limit', $newLimit . 'M' );
     return $memoryLimitMB;
  }
  return false;     
    }

Setting margin, padding and designMode enable a javascript created iframe in Firefox

It was a little bit tricky to designMode enable and change the style of a javascript created iframe in firefox.

Anyway, the trick seems to be to wait a little with a setTimeout before setting designMode='on' and changing the style of the javascript created iframe.

My successfull code looks like this [Firefox only, not IE]:

function addEditableField(parent, iframeId){
  // Create the iframe, give it an id and attach it to an existing dom-element
  var newIFrame = document.createElement('iframe');
  newIFrame.id = 'iframeId';
  document.getElementById(parent).appendChild(newIFrame);
  // Wait a little for the iframe document to be prepared before doing stuff to it
  setTimeout("enable('"+iframeId+"')",20);
}

function enable(id){
  // Now some time has passed, so now we can play with the iframe:
  document.getElementById(id).contentWindow.document.designMode='on';
  document.getElementById(id).contentWindow.document.body.style.margin = '3px';
  document.getElementById(id).contentWindow.document.body.style.padding = '3px';
}

addEditableField('parentDiv','testField');

And that's it. (Btw, sorry for the long title, but I prefer to know what I'll get when I go somewhere using google).