+ return null;
+ }
+ }
+
+ static function filename($id, $extension, $extra=null)
+ {
+ return $id . (($extra) ? ('-' . $extra) : '') . $extension;
+ }
+
+ static function path($filename)
+ {
+ $dir = common_config('background', 'dir');
+
+ if ($dir[strlen($dir)-1] != '/') {
+ $dir .= '/';
+ }
+
+ return $dir . $filename;
+ }
+
+ static function url($filename)
+ {
+ $path = common_config('background', 'path');
+
+ if ($path[strlen($path)-1] != '/') {
+ $path .= '/';
+ }
+
+ if ($path[0] != '/') {
+ $path = '/'.$path;
+ }
+
+ $server = common_config('background', 'server');
+
+ if (empty($server)) {
+ $server = common_config('site', 'server');
+ }
+
+ // XXX: protocol
+
+ return 'http://'.$server.$path.$filename;
+ }
+
+ function setDisposition($on, $off, $tile)
+ {
+ if ($on) {
+ $this->disposition |= BACKGROUND_ON;
+ } else {
+ $this->disposition &= ~BACKGROUND_ON;
+ }
+
+ if ($off) {
+ $this->disposition |= BACKGROUND_OFF;
+ } else {
+ $this->disposition &= ~BACKGROUND_OFF;
+ }
+
+ if ($tile) {
+ $this->disposition |= BACKGROUND_TILE;
+ } else {
+ $this->disposition &= ~BACKGROUND_TILE;
+ }
+ }
+
+ /**
+ * Return a design object based on the configured site design.
+ *
+ * @return Design a singleton design object for the site.
+ */
+
+ static function siteDesign()
+ {
+ static $siteDesign = null;
+
+ if (empty($siteDesign)) {
+
+ $siteDesign = new Design();
+
+ $attrs = array('backgroundcolor',
+ 'contentcolor',
+ 'sidebarcolor',
+ 'textcolor',
+ 'linkcolor',
+ 'backgroundimage',
+ 'disposition');
+
+ foreach ($attrs as $attr) {
+ $val = common_config('design', $attr);
+ if ($val !== false) {
+ $siteDesign->$attr = $val;
+ }
+ }