Add comments for hardcoded scaling values

src/controllers/dashboard/dashboard.js

@@ -634,6 +634,8 @@ define(["datetime", "events", "itemHelper", "serverNotifications", "dom", "globa
             return "<img src='" + iconUrl + "' />";
         },
         getNowPlayingImageUrl: function (item) {
+            /* Screen width is multiplied by 0.2, as the there is now way to get the width of
+            elements that aren't crated yet. */
             if (item && item.BackdropImageTags && item.BackdropImageTags.length) {
                 return ApiClient.getScaledImageUrl(item.Id, {
                     maxWidth: Math.round(dom.getScreenWidth() * 0.20),

src/controllers/itemdetailpage.js

@@ -767,6 +767,9 @@ define(["loading", "appRouter", "layoutManager", "connectionManager", "userSetti
         var shape = "portrait";
         var detectRatio = false;
 
+        /* In the following section, getScreenWidth() is multiplied by 0.5 as the posters
+        are 25vw and we need double the resolution to counter Skia's scaling. */
+        // TODO: Find a reliable way to get the poster width
         if (imageTags.Primary) {
             url = apiClient.getScaledImageUrl(item.Id, {
                 type: "Primary",