/**
* Uses WP_Image_Editor_Imagick to generate thumbnails.
*
* @param int $ID The attachment ID to retrieve thumbnail from.
* @param int $pg The page to get the thumbnail of.
*
* @return bool|string False on failure, URL to thumb on success.
*/
public function getThumbnail($ID, $pg = 1)
{
$doc_path = get_attached_file($ID);
$img = new DG_Image_Editor_Imagick($doc_path, $pg - 1);
$err = $img->load();
if (is_wp_error($err)) {
DG_Logger::writeLog(DG_LogLevel::Error, __('Failed to open file in Imagick: ', 'document-gallery') . $err->get_error_message());
return false;
}
$temp_file = DG_Util::getTempFile();
$err = $img->save($temp_file, 'image/png');
if (is_wp_error($err)) {
DG_Logger::writeLog(DG_LogLevel::Error, __('Failed to save image in Imagick: ', 'document-gallery') . $err->get_error_message());
return false;
}
return $temp_file;
}
/**
* @filter dg_thumbers Allows developers to filter the Thumbers used
* for specific filetypes. Index is the regex to match file extensions
* supported and the value is anything that can be accepted by call_user_func().
* The function must take two parameters, 1st is the int ID of the attachment
* to get a thumbnail for, 2nd is the page to take a thumbnail of
* (may not be relevant for some filetypes).
*
* @return array
*/
private static function getThumbers()
{
static $thumbers = null;
if (is_null($thumbers)) {
$options = self::getOptions();
$active = $options['active'];
$thumbers = array();
// Audio/Video embedded images
if ($active['av']) {
$exts = implode('|', self::getAudioVideoExts());
$thumbers[$exts] = array(__CLASS__, 'getAudioVideoThumbnail');
}
// Ghostscript
if ($active['gs'] && self::isGhostscriptAvailable()) {
$exts = implode('|', self::getGhostscriptExts());
$thumbers[$exts] = array(__CLASS__, 'getGhostscriptThumbnail');
}
// Imagick
if ($active['imagick'] && self::isImagickAvailable()) {
include_once DG_PATH . 'inc/class-image-editor-imagick.php';
if ($exts = DG_Image_Editor_Imagick::query_formats()) {
$exts = implode('|', $exts);
$thumbers[$exts] = array(__CLASS__, 'getImagickThumbnail');
}
}
// allow users to filter thumbers used
$thumbers = apply_filters('dg_thumbers', $thumbers);
// strip out anything that can't be called
$thumbers = array_filter($thumbers, 'is_callable');
// log which thumbers are being used
if (DG_Logger::logEnabled()) {
if (count($thumbers) > 0) {
$entry = __('Thumbnail Generators: ', 'document-gallery');
foreach ($thumbers as $k => $v) {
$thumber = is_array($v) ? implode('::', $v) : print_r($v, true);
// TODO: The following works for all internal regexes, but may have unpredictable
// results if developer adds additional thumbnail generators using different regexes
$filetypes = str_replace('|', ', ', $k);
$entry .= PHP_EOL . "{$thumber}: {$filetypes}";
}
} else {
$entry = __('No thumbnail generators enabled.', 'document-gallery');
}
DG_Logger::writeLog(DG_LogLevel::Detail, $entry);
}
}
return $thumbers;
}
