70 lines
2.2 KiB
PHP
70 lines
2.2 KiB
PHP
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<?php
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function getPreview($imgFile, $maxSize = THUMB_SIZE)
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{
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# example: data/myalbum/100.mypic.jpg
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$newImgFile = DATA_DIR."/".dirname($imgFile)."/".$maxSize.".".basename($imgFile);
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# if the preview is a symlink, image is already good sized
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if (is_link($newImgFile)) return $imgFile;
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if (! is_file($newImgFile))
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{
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# this tels the template to flush output after displaying previews
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$GLOBALS["generating"] = true;
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# reset script time limit to 20s (wont work in safe mode)
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set_time_limit(20);
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$ext = strtolower(substr($imgFile, -4));
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if ($ext == ".jpg")
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$img = imagecreatefromjpeg($imgFile);
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else
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$img = imagecreatefrompng($imgFile);
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$w = imagesx($img);
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$h = imagesy($img);
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# if the image is already small and squared, make a symlink and return it
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if ($w <= $maxSize and $h <= $maxSize and $w == $h) {
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imagedestroy($img);
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symlink($imgFile, $newImgFile);
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return $imgFile;
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}
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# config to allow group writable files
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umask(DATA_UMASK);
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# create the thumbs directory recursively
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if (! is_dir(dirname($newImgFile))) mkdir(dirname($newImgFile), 0777, true);
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if ($w > $h) {
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$srcSize = $h;
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$srcY = 0;
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$srcX = ($w - $srcSize)/2;
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} elseif ($w < $h) {
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$srcSize = $w;
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$srcX = 0;
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$srcY = ($h - $srcSize)/2;
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} else {
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$srcSize = $w;
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$srcX = $srcY = 0;
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}
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$newImg = imagecreatetruecolor(THUMB_SIZE, THUMB_SIZE);
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imagecopyresampled($newImg, $img, 0, 0, $srcX, $srcY, THUMB_SIZE, THUMB_SIZE, $srcSize, $srcSize);
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if ($ext == ".jpg")
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imagejpeg($newImg, $newImgFile);
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else
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imagepng($newImg, $newImgFile);
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imagedestroy($img);
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imagedestroy($newImg);
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}
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return $newImgFile;
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}
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?>
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