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

egui-winit/src/epi.rs

@@ -198,6 +198,7 @@ pub struct EpiIntegration {
 impl EpiIntegration {
     pub fn new(
         integration_name: &'static str,
+        max_texture_side: usize,
         window: &winit::window::Window,
         repaint_signal: std::sync::Arc<dyn epi::backend::RepaintSignal>,
         persistence: crate::epi::Persistence,
@@ -223,7 +224,7 @@ impl EpiIntegration {
             frame,
             persistence,
             egui_ctx,
-            egui_winit: crate::State::new(window),
+            egui_winit: crate::State::new(max_texture_side, window),
             app,
             quit: false,
         };