<?php
/*
* thumbnailer.php
*/
/**
* @return string
* @param $o_file string Filename of image to make thumbnail of
* @param $t_file string Filename to use for thumbnail
* @desc Takes an image and makes a jpeg thumbnail defaulted to 100px high
*/
function makeThumbnail($o_file, $t_file, $t_ht = 100) {
$image_info = getImageSize($o_file) ; // see EXIF for faster way
switch ($image_info['mime']) {
case 'image/gif':
if (imagetypes() & IMG_GIF) { // not the same as IMAGETYPE
$o_im = imageCreateFromGIF($o_file) ;
} else {
$ermsg = 'GIF images are not supported<br />';
}
break;
case 'image/jpeg':
if (imagetypes() & IMG_JPG) {
$o_im = imageCreateFromJPEG($o_file) ;
} else {
$ermsg = 'JPEG images are not supported<br />';
}
break;
case 'image/png':
if (imagetypes() & IMG_PNG) {
$o_im = imageCreateFromPNG($o_file) ;
} else {
$ermsg = 'PNG images are not supported<br />';
}
break;
case 'image/wbmp':
if (imagetypes() & IMG_WBMP) {
$o_im = imageCreateFromWBMP($o_file) ;
} else {
$ermsg = 'WBMP images are not supported<br />';
}
break;
default:
$ermsg = $image_info['mime'].' images are not supported<br />';
break;
}
if (!isset($ermsg)) {
$o_wd = imagesx($o_im) ;
$o_ht = imagesy($o_im) ;
// thumbnail width = target * original width / original height
$t_wd = round($o_wd * $t_ht / $o_ht) ;
$t_im = imageCreateTrueColor($t_wd,100);
imageCopyResampled($t_im, $o_im, 0, 0, 0, 0, $t_wd, $t_ht, $o_wd, $o_ht);
imageJPEG($t_im,$t_file);
imageDestroy($o_im);
imageDestroy($t_im);
}
return isset($ermsg)?$ermsg:NULL;
}
?>
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