» function imagecreatefrombmp(): Läuft mit allen Bitraten!

if ( !function_exists("imagecreatefrombmp") ) {

/**
 * Credit goes to mgutt 
 * http://www.programmierer-forum.de/function-imagecreatefrombmp-welche-variante-laeuft-t143137.htm
 * Modified by Fabien Menager to support RGB555 BMP format
 */
function imagecreatefrombmp($filename) {
  // version 1.1
  if (!($fh = fopen($filename, 'rb'))) {
    trigger_error('imagecreatefrombmp: Can not open ' . $filename, E_USER_WARNING);
    return false;
  }
  
  // read file header
  $meta = unpack('vtype/Vfilesize/Vreserved/Voffset', fread($fh, 14));
  
  // check for bitmap
  if ($meta['type'] != 19778) {
    trigger_error('imagecreatefrombmp: ' . $filename . ' is not a bitmap!', E_USER_WARNING);
    return false;
  }
  
  // read image header
  $meta += unpack('Vheadersize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vcolors/Vimportant', fread($fh, 40));
  $bytes_read = 40;
  
  // read additional bitfield header
  if ($meta['compression'] == 3) {
    $meta += unpack('VrMask/VgMask/VbMask', fread($fh, 12));
    $bytes_read += 12;
  }
  
  // set bytes and padding
  $meta['bytes'] = $meta['bits'] / 8;
  $meta['decal'] = 4 - (4 * (($meta['width'] * $meta['bytes'] / 4)- floor($meta['width'] * $meta['bytes'] / 4)));
  if ($meta['decal'] == 4) {
    $meta['decal'] = 0;
  }
  
  // obtain imagesize
  if ($meta['imagesize'] < 1) {
    $meta['imagesize'] = $meta['filesize'] - $meta['offset'];
    // in rare cases filesize is equal to offset so we need to read physical size
    if ($meta['imagesize'] < 1) {
      $meta['imagesize'] = @filesize($filename) - $meta['offset'];
      if ($meta['imagesize'] < 1) {
        trigger_error('imagecreatefrombmp: Can not obtain filesize of ' . $filename . '!', E_USER_WARNING);
        return false;
      }
    }
  }
  
  // calculate colors
  $meta['colors'] = !$meta['colors'] ? pow(2, $meta['bits']) : $meta['colors'];
  
  // read color palette
  $palette = array();
  if ($meta['bits'] < 16) {
    $palette = unpack('l' . $meta['colors'], fread($fh, $meta['colors'] * 4));
    // in rare cases the color value is signed
    if ($palette[1] < 0) {
      foreach ($palette as $i => $color) {
        $palette[$i] = $color + 16777216;
      }
    }
  }
  
  // ignore extra bitmap headers
  if ($meta['headersize'] > $bytes_read) {
    fread($fh, $meta['headersize'] - $bytes_read);
  }
  
  // create gd image
  $im = imagecreatetruecolor($meta['width'], $meta['height']);
  $data = fread($fh, $meta['imagesize']);
  
  // uncompress data
  switch ($meta['compression']) {
    case 1: $data = rle8_decode($data, $meta['width']); break;
    case 2: $data = rle4_decode($data, $meta['width']); break;
  }

  $p = 0;
  $vide = chr(0);
  $y = $meta['height'] - 1;
  $error = 'imagecreatefrombmp: ' . $filename . ' has not enough data!';

  // loop through the image data beginning with the lower left corner
  while ($y >= 0) {
    $x = 0;
    while ($x < $meta['width']) {
      switch ($meta['bits']) {
        case 32:
        case 24:
          if (!($part = substr($data, $p, 3 /*$meta['bytes']*/))) {
            trigger_error($error, E_USER_WARNING);
            return $im;
          }
          $color = unpack('V', $part . $vide);
          break;
        case 16:
          if (!($part = substr($data, $p, 2 /*$meta['bytes']*/))) {
            trigger_error($error, E_USER_WARNING);
            return $im;
          }
          $color = unpack('v', $part);

          if (empty($meta['rMask']) || $meta['rMask'] != 0xf800) {
            $color[1] = (($color[1] & 0x7c00) >> 7) * 65536 + (($color[1] & 0x03e0) >> 2) * 256 + (($color[1] & 0x001f) << 3); // 555
          }
          else { 
            $color[1] = (($color[1] & 0xf800) >> 8) * 65536 + (($color[1] & 0x07e0) >> 3) * 256 + (($color[1] & 0x001f) << 3); // 565
          }
          break;
        case 8:
          $color = unpack('n', $vide . substr($data, $p, 1));
          $color[1] = $palette[ $color[1] + 1 ];
          break;
        case 4:
          $color = unpack('n', $vide . substr($data, floor($p), 1));
          $color[1] = ($p * 2) % 2 == 0 ? $color[1] >> 4 : $color[1] & 0x0F;
          $color[1] = $palette[ $color[1] + 1 ];
          break;
        case 1:
          $color = unpack('n', $vide . substr($data, floor($p), 1));
          switch (($p * 8) % 8) {
            case 0: $color[1] =  $color[1] >> 7; break;
            case 1: $color[1] = ($color[1] & 0x40) >> 6; break;
            case 2: $color[1] = ($color[1] & 0x20) >> 5; break;
            case 3: $color[1] = ($color[1] & 0x10) >> 4; break;
            case 4: $color[1] = ($color[1] & 0x8 ) >> 3; break;
            case 5: $color[1] = ($color[1] & 0x4 ) >> 2; break;
            case 6: $color[1] = ($color[1] & 0x2 ) >> 1; break;
            case 7: $color[1] = ($color[1] & 0x1 );      break;
          }
          $color[1] = $palette[ $color[1] + 1 ];
          break;
        default:
          trigger_error('imagecreatefrombmp: ' . $filename . ' has ' . $meta['bits'] . ' bits and this is not supported!', E_USER_WARNING);
          return false;
      }
      imagesetpixel($im, $x, $y, $color[1]);
      $x++;
      $p += $meta['bytes'];
    }
    $y--;
    $p += $meta['decal'];
  }
  fclose($fh);
  return $im;
}
}

/** 
 * Decoder for RLE8 compression in windows bitmaps
 * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp
 *
 * @param string  $str   Data to decode
 * @param integer $width Image width
 *
 * @return string
 */
function rle8_decode ($str, $width){
  $lineWidth = $width + (3 - ($width-1) % 4);
  $out = '';
  $cnt = strlen($str);
  
  for ($i = 0; $i <$cnt; $i++) {
    $o = ord($str[$i]);
    switch ($o){
      case 0: # ESCAPE
        $i++;
        switch (ord($str[$i])){
          case 0: # NEW LINE
            $padCnt = $lineWidth - strlen($out)%$lineWidth;
            if ($padCnt<$lineWidth) $out .= str_repeat(chr(0), $padCnt); # pad line
            break;
          case 1: # END OF FILE
            $padCnt = $lineWidth - strlen($out)%$lineWidth;
            if ($padCnt<$lineWidth) $out .= str_repeat(chr(0), $padCnt); # pad line
            break 3;
          case 2: # DELTA
            $i += 2;
            break;
          default: # ABSOLUTE MODE
            $num = ord($str[$i]);
            for ($j = 0; $j < $num; $j++)
              $out .= $str[++$i];
            if ($num % 2) $i++;
        }
      break;
      default:
      $out .= str_repeat($str[++$i], $o);
    }
  }
  return $out;
}
/** 
 * Decoder for RLE4 compression in windows bitmaps
 * see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp
 *
 * @param string  $str   Data to decode
 * @param integer $width Image width
 *
 * @return string
 */
function rle4_decode ($str, $width) {
  $w = floor($width/2) + ($width % 2);
  $lineWidth = $w + (3 - ( ($width-1) / 2) % 4);    
  $pixels = array();
  $cnt = strlen($str);
  $c = 0;
  
  for ($i = 0; $i < $cnt; $i++) {
    $o = ord($str[$i]);
    switch ($o) {
      case 0: # ESCAPE
        $i++;
        switch (ord($str[$i])){
          case 0: # NEW LINE
            while (count($pixels)%$lineWidth != 0) {
              $pixels[] = 0;
            }
            break;
          case 1: # END OF FILE
            while (count($pixels)%$lineWidth != 0) {
              $pixels[] = 0;
            }
            break 3;
          case 2: # DELTA
            $i += 2;
            break;
          default: # ABSOLUTE MODE
            $num = ord($str[$i]);
            for ($j = 0; $j < $num; $j++) {
              if ($j%2 == 0) {
                $c = ord($str[++$i]);
                $pixels[] = ($c & 240)>>4;
              }
              else {
                $pixels[] = $c & 15;
              }
            }
            
            if ($num % 2 == 0) {
              $i++;
            }
       }
       break;
      default:
        $c = ord($str[++$i]);
        for ($j = 0; $j < $o; $j++) {
          $pixels[] = ($j%2==0 ? ($c & 240)>>4 : $c & 15);
        }
    }
  }
  
  $out = '';
  if (count($pixels)%2) {
    $pixels[] = 0;
  }
  
  $cnt = count($pixels)/2;
  
  for ($i = 0; $i < $cnt; $i++) {
    $out .= chr(16*$pixels[2*$i] + $pixels[2*$i+1]);
  }
    
  return $out;
} 

Zitat

Ich habe ca. 1.000 durch Nutzer unserer Community hochgeladene Bitmaps zum Test herangezogen.

Diese Funktion geht nicht:
http://printf.ru/wiki/imagecreatefrombmp

Diese auch nicht:
http://snipplr.com/view/24283/imagecreatefrombmp/

Sinnfrei, weil die includete "function_imagecreatefrombmp.php" fehlt:
http://www.php-code.eu/code/Function-ImageCreateFromBMP-169.html

Weitere Tests laufen..

Zitat

Warning: imagecreatefromgd() [function.imagecreatefromgd]: '/tmp/GDZs5PSQ' is not a valid GD file in /www/htdocs/xyz on line 123

Mach mit!