Choose your own font and size (#1154)

* Refactor text layout: don't need &Fonts in all functions
* Replace indexing in Fonts with member function
* Wrap Fonts in a Mutex
* Remove mutex for Font::glyph_info_cache
* Remove RwLock around Font::characters
* Put FontsImpl and GalleyCache behind the same Mutex
* Round font sizes to whole pixels before deduplicating them
* Make TextStyle !Copy
* Implement user-named TextStyle:s
* round font size earlier
* Cache fonts based on family and size
* Move TextStyle into egui and Style
* Remove body_text_style
* Query graphics about max texture size and use that as font atlas size
* Recreate texture atlas when it is getting full

eframe/examples/custom_font.rs

@@ -35,14 +35,14 @@ impl epi::App for MyApp {
 
         // Put my font first (highest priority) for proportional text:
         fonts
-            .fonts_for_family
+            .families
             .entry(egui::FontFamily::Proportional)
             .or_default()
             .insert(0, "my_font".to_owned());
 
         // Put my font as last fallback for monospace:
         fonts
-            .fonts_for_family
+            .families
             .entry(egui::FontFamily::Monospace)
             .or_default()
             .push("my_font".to_owned());

eframe/examples/file_dialog.rs

@@ -82,7 +82,7 @@ impl MyApp {
                 screen_rect.center(),
                 Align2::CENTER_CENTER,
                 text,
-                TextStyle::Heading,
+                TextStyle::Heading.resolve(&ctx.style()),
                 Color32::WHITE,
             );
         }