Add setting for thumbnail scaling

Output.php

@@ -58,12 +58,27 @@ class Output
         $thumbH = 150;
         $thumbQ = 80;
 
-        $placeholderUrl = DOKU_BASE . 'lib/images/blank.gif';
+        // Allow generating larger thumbnails (e.g. 2x) while still displaying them
+        // at 150x150 for sharper results on HiDPI screens.
+        $thumbScale = 1.0;
         $syntax = plugin_load('syntax', 'luxtools');
+        if ($syntax) {
+            $rawScale = (string)$syntax->getConf('gallery_thumb_scale');
+            if ($rawScale !== '') {
+                $thumbScale = (float)$rawScale;
+            }
+        }
+        if (!is_finite($thumbScale) || $thumbScale < 1.0) $thumbScale = 1.0;
+        if ($thumbScale > 4.0) $thumbScale = 4.0;
+
+        $genThumbW = (int)max(1, (int)round($thumbW * $thumbScale));
+        $genThumbH = (int)max(1, (int)round($thumbH * $thumbScale));
+
+        $placeholderUrl = DOKU_BASE . 'lib/images/blank.gif';
         $placeholderId = $syntax ? trim((string)$syntax->getConf('thumb_placeholder')) : '';
         if ($placeholderId !== '' && function_exists('ml')) {
             // ml() builds a fetch.php URL for a MediaManager item
-            $placeholderUrl = ml($placeholderId, ['w' => $thumbW, 'h' => $thumbH], true, '&');
+            $placeholderUrl = ml($placeholderId, ['w' => $genThumbW, 'h' => $genThumbH], true, '&');
         }
 
         /** @var \Doku_Renderer_xhtml $renderer */
@@ -74,8 +89,10 @@ class Output
             $url = $this->itemWebUrl($item, !empty($params['randlinks']));
             $thumbUrl = $this->withQueryParams($url, [
                 'thumb' => 1,
-                'w' => $thumbW,
-                'h' => $thumbH,
+                'w' => $genThumbW,
+                'h' => $genThumbH,
+                // Keep quality explicit so cache file naming stays stable.
+                'q' => $thumbQ,
             ]);
             $safeUrl = hsc($url);
             $safeThumbUrl = hsc($thumbUrl);
@@ -84,7 +101,7 @@ class Output
 
             $initialSrc = $safePlaceholderUrl;
                 $dataThumb = ' data-thumb-src="' . $safeThumbUrl . '"';
-            $thumbCachePath = $this->thumbCachePathForItem($item, $thumbW, $thumbH, $thumbQ);
+            $thumbCachePath = $this->thumbCachePathForItem($item, $genThumbW, $genThumbH, $thumbQ);
             if (is_string($thumbCachePath) && $thumbCachePath !== '' && @is_file($thumbCachePath)) {
                 // Thumb already exists: start with it immediately (no JS swap needed)
                 $initialSrc = $safeThumbUrl;

conf/default.php

@@ -12,6 +12,10 @@ $conf['extensions'] = '';
 // MediaManager ID for gallery thumbnail placeholder
 $conf['thumb_placeholder'] = ':wiki:thumb-placeholder.png';
 
+// Multiplier for gallery thumbnail generation size (1 = 150x150, 2 = 300x300).
+// Thumbnails are still displayed as 150x150 on the page.
+$conf['gallery_thumb_scale'] = 1;
+
 // Local opener service used by {{open>...}}.
 $conf['open_service_url'] = 'http://127.0.0.1:8765';
 $conf['open_service_token'] = '';

conf/metadata.php

@@ -14,5 +14,8 @@ $meta['extensions'] = array('string');
 
 $meta['thumb_placeholder'] = array('string');
 
+// Thumbnail generation scale factor for the {{images>...}} gallery.
+$meta['gallery_thumb_scale'] = array('string');
+
 $meta['open_service_url'] = array('string');
 $meta['open_service_token'] = array('string');

lang/de/settings.php

@@ -4,5 +4,7 @@ $lang['allow_in_comments'] = 'Files-Syntax in Kommentaren erlauben.';
 
 $lang['thumb_placeholder'] = 'MediaManager-ID für den Platzhalter der Galerie-Thumbnails';
 
+$lang['gallery_thumb_scale'] = 'Skalierungsfaktor für Galerie-Thumbnails. 2 erzeugt schärfere Thumbnails auf HiDPI-Displays (Anzeige bleibt 150×150).';
+
 $lang['open_service_url'] = 'URL des lokalen Öffner-Dienstes für {{open>...}} (z.B. http://127.0.0.1:8765).';
 $lang['open_service_token'] = 'Token für den lokalen Öffner-Dienst (X-Filetools-Token).';

lang/en/settings.php

@@ -6,5 +6,7 @@ $lang['extensions'] = 'Comma-separated list of allowed file extensions to list';
 
 $lang['thumb_placeholder'] = 'MediaManager ID for the gallery thumbnail placeholder';
 
+$lang['gallery_thumb_scale'] = 'Gallery thumbnail scale factor. Use 2 for sharper thumbnails on HiDPI screens (still displayed as 150×150).';
+
 $lang['open_service_url'] = 'Local opener service URL for the {{open>...}} button (e.g. http://127.0.0.1:8765).';
 $lang['open_service_token'] = 'Token sent to the local opener service (X-Filetools-Token).';

lang/nl/settings.php

@@ -10,5 +10,7 @@ $lang['extensions'] = 'Komma-gescheiden lijst van toegestane bestandsextensies v
 
 $lang['thumb_placeholder'] = 'MediaManager-ID voor de placeholder van galerij thumbnails';
 
+$lang['gallery_thumb_scale'] = 'Schaalfactor voor galerij thumbnails. Gebruik 2 voor scherpere thumbnails op HiDPI-schermen (weergave blijft 150×150).';
+
 $lang['open_service_url'] = 'Lokale opener service-URL voor de {{open>...}} knop (bijv. http://127.0.0.1:8765).';
 $lang['open_service_token'] = 'Token dat naar de lokale opener service wordt gestuurd (X-Filetools-Token).';