/**
* This function create, if necessary, an thumbnail of a strip
*
* @param string $src The original path of strip
* @param string $dest The thumbnail path of strip
* @throws Exception If the folder for the thumbnail doesn't exist, an exception is throwed
* @return boolean True if the thumbnail is created, False else
*/
function createThumb($src, $dest)
{
// check if the thumb exist
if (file_exists($dest) === true) {
$original_time = filemtime($src);
$thumbnail_time = filemtime($dest);
// if the thumb is created after the original, it's ok
if ($original_time < $thumbnail_time) {
return true;
}
}
// check if the directory for thumbnail exist or create it
if (checkDirAndCreate(Config::getThumbFolder()) === false) {
throw new Exception('Impossible to create thumbs folder : "' . Config::getThumbFolder() . '"');
}
// calculate the width and height of thumbnail
$width = Config::getThumbSize();
$size = getimagesize($src);
if ($size[0] > $width) {
$rapport = $size[0] / $width;
$height = $size[1] / $rapport;
} else {
$width = $size[0];
$height = $size[1];
}
$img_src = imagecreatefrompng($src);
$img_dst = imagecreatetruecolor($width, $height);
// Preserve alpha transparency : thank crash <http://www.php.net/manual/fr/function.imagecopyresampled.php#85038>
imagecolortransparent($img_dst, imagecolorallocate($img_dst, 0, 0, 0));
imagealphablending($img_dst, false);
imagesavealpha($img_dst, true);
$res = imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
if (!$res) {
return false;
}
$res = imagepng($img_dst, $dest);
if (!$res) {
return false;
}
return true;
}
/**
* Return the path with filename of thumbnail of the strip in PNG format
* @return string the path with filename of thumbnail of the strip in PNG format
* @access public
*/
public function getThumbSrc()
{
$original = $this->getFilenamePng();
$dest = Config::getThumbFolder() . '/' . pathinfo(Config::getStripFolder() . '/' . $this->getFilename(), PATHINFO_FILENAME) . '.png';
if (createThumb($original, $dest) === true) {
return $dest;
} else {
return $original;
}
}
