Working under the assumption that the only 'architecture dependant' part of the font files is endianness, I wrote a quick and dirty Python script to convert between the two. It has only been tested on a single font on a single machine so don't bet your life on it working. All it does is swap the byte order of the first four ints.
f = open("myfont.gdf", "rb");
d = open("myconvertedfont.gdf", "wb");
for i in xrange(4):
b = [f.read(1) for j in xrange(4)];
I successfully used this script to convert anonymous.gdf, from one of the font links below, into something useable on Mac OS X.
(PHP 4, PHP 5)
imageloadfont — Load a new font
imageloadfont() loads a user-defined bitmap and returns its identifier.
The font file format is currently binary and architecture dependent. This means you should generate the font files on the same type of CPU as the machine you are running PHP on.
Font file format byte position C data type description byte 0-3 int number of characters in the font byte 4-7 int value of first character in the font (often 32 for space) byte 8-11 int pixel width of each character byte 12-15 int pixel height of each character byte 16- char array with character data, one byte per pixel in each character, for a total of (nchars*width*height) bytes.
The font identifier which is always bigger than 5 to avoid conflicts with built-in fonts or FALSE on errors.
Example #1 imageloadfont() usage example
// Create a new image instance
$im = imagecreatetruecolor(50, 20);
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
// Make the background white
imagefilledrectangle($im, 0, 0, 49, 19, $white);
// Load the gd font and write 'Hello'
$font = imageloadfont('./04b.gdf');
imagestring($im, $font, 0, 0, 'Hello', $black);
// Output to browser
Confirmation code generation for preventing automated registrations on a website.
Function arguments are:
$code - the code that you shall random generate
$location - relative location of the image that shall be generated
$fonts_dir - relative location for the GDF fonts directory
This function will create an image with the code given by you and will save it in the directory specified with the name formed by MD5 hash of the code.
You may insert as many font types in the fonts directory as you wish, with random names.
function generate_image($code, $location, $fonts_dir)
$image = imagecreate(150, 60);
imagecolorallocate($image, rand(0, 100), rand(100, 150), rand(150, 250));
$fonts = scandir($fonts_dir);
$max = count($fonts) - 2;
$width = 10;
for ($i = 0; $i <= strlen($code); $i++)
$textcolor = imagecolorallocate($image, 255, 255, 255);
$rand = rand(2, $max);
$font = imageloadfont($fonts_dir."/".$fonts[$rand]);
$fh = imagefontheight($font);
$fw = imagefontwidth($font);
imagechar($image, $font, $width, rand(10, 50 - $fh), $code[$i], $textcolor);
$width = $width + $fw;
imagejpeg($image, $location."/".md5($code).".jpg", 100);
Remember - GD fonts aren't antialiased. If you're planning on using a pre-existing (TrueType) font, you may want to consider using imagettftext() instead of phillip's function.
I've written an online tool in PHP that allows you to create GD fonts from PNG images.
much usefulness for custom font creation, I feel.
see the tool@
(source available online)
Sometime ago I wrote a small tutorial on how to create dynamic signatures using gd_fonts. I also uploaded some gd_fonts...
You can check it out here, if you wish:
Hope that helps
After noting the gd fonts page from dryes58 above was down I contacted the him and have put the pages up at http://www.widgnet.com/gdf_fonts/ hows about that then =)