More font handling cleanup

Group all fields we need to determine a physical font into one FontRequest
structure and use that throughout.

That way adding more fields will require less changes.

sixtyfps_runtime/corelib/font/mod.rs

@@ -27,12 +27,21 @@ struct FontMatch {
     fonts_per_pixel_size: Vec<Rc<Font>>,
 }
 
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct FontRequest {
+    family: SharedString,
+    pixel_size: f32,
+}
+
 pub trait HasFont {
     fn font_family(&self) -> SharedString;
     fn font_pixel_size(&self, window: &crate::eventloop::ComponentWindow) -> f32;
+    fn font_request(&self, window: &crate::eventloop::ComponentWindow) -> FontRequest {
+        FontRequest { family: self.font_family(), pixel_size: self.font_pixel_size(window) }
+    }
     fn font(&self, window: &crate::eventloop::ComponentWindow) -> Rc<Font> {
-        crate::font::FONT_CACHE
-            .with(|fc| fc.find_font(&self.font_family(), self.font_pixel_size(window)))
+        crate::font::FONT_CACHE.with(|fc| fc.find_font(&self.font_request(window)))
     }
 }
 
@@ -43,21 +52,29 @@ pub struct FontCache {
 }
 
 impl FontCache {
-    pub fn find_font(&self, family: &SharedString, pixel_size: f32) -> Rc<Font> {
-        assert_ne!(pixel_size, 0.0);
+    pub fn find_font(&self, request: &FontRequest) -> Rc<Font> {
+        assert_ne!(request.pixel_size, 0.0);
 
         let mut loaded_fonts = self.loaded_fonts.borrow_mut();
-        let font_match = loaded_fonts.entry(family.clone()).or_insert_with(|| FontMatch {
-            handle: FontHandle::new_from_match(family),
+        let font_match = loaded_fonts.entry(request.family.clone()).or_insert_with(|| FontMatch {
+            handle: FontHandle::new_from_match(&request.family),
             fonts_per_pixel_size: Vec::new(),
         });
 
         font_match
             .fonts_per_pixel_size
             .iter()
-            .find_map(|font| if font.pixel_size == pixel_size { Some(font.clone()) } else { None })
+            .find_map(
+                |font| {
+                    if font.pixel_size == request.pixel_size {
+                        Some(font.clone())
+                    } else {
+                        None
+                    }
+                },
+            )
             .unwrap_or_else(|| {
-                let fnt = Rc::new(font_match.handle.load(pixel_size).unwrap());
+                let fnt = Rc::new(font_match.handle.load(request.pixel_size).unwrap());
                 font_match.fonts_per_pixel_size.push(fnt.clone());
                 fnt
             })

sixtyfps_runtime/corelib/graphics.rs

@@ -285,7 +285,7 @@ pub enum HighLevelRenderingPrimitive {
     /// Expected rendering variables:
     /// * [`RenderingVariable::Color`]: The color to use for rendering the glyphs.
     /// * [`RenderingVariable::TextCursor`]: Draw a text cursor.
-    Text { text: crate::SharedString, font_family: crate::SharedString, font_size: f32 },
+    Text { text: crate::SharedString, font_request: super::font::FontRequest },
     /// Renders a path specified by the `elements` parameter. The path will be scaled to fit into the given
     /// `width` and `height`. If the `stroke_width` is greater than zero, then path will also be outlined.
     ///

sixtyfps_runtime/corelib/items.rs

@@ -529,8 +529,7 @@ impl Item for Text {
     ) -> HighLevelRenderingPrimitive {
         HighLevelRenderingPrimitive::Text {
             text: Self::FIELD_OFFSETS.text.apply_pin(self).get(),
-            font_family: Self::FIELD_OFFSETS.font_family.apply_pin(self).get(),
-            font_size: Text::font_pixel_size(self, window),
+            font_request: self.font_request(window),
         }
     }
 
@@ -562,16 +561,12 @@ impl Item for Text {
     }
 
     fn layouting_info(self: Pin<&Self>, window: &ComponentWindow) -> LayoutInfo {
-        let font_family = Self::FIELD_OFFSETS.font_family.apply_pin(self).get();
-        let font_size = Text::font_pixel_size(self, window);
         let text = Self::FIELD_OFFSETS.text.apply_pin(self).get();
 
-        crate::font::FONT_CACHE.with(|fc| {
-            let font = fc.find_font(&font_family, font_size);
+        let font = self.font(window);
         let width = font.text_width(&text);
         let height = font.height();
         LayoutInfo { min_width: width, min_height: height, ..LayoutInfo::default() }
-        })
     }
 
     fn input_event(
@@ -596,17 +591,6 @@ impl ItemConsts for Text {
         Text::FIELD_OFFSETS.cached_rendering_data.as_unpinned_projection();
 }
 
-impl Text {
-    fn font_pixel_size(self: Pin<&Self>, window: &ComponentWindow) -> f32 {
-        let font_size = Self::FIELD_OFFSETS.font_size.apply_pin(self).get();
-        if font_size == 0.0 {
-            DEFAULT_FONT_SIZE * window.scale_factor()
-        } else {
-            font_size
-        }
-    }
-}
-
 impl HasFont for Pin<&Text> {
     fn font_family(&self) -> SharedString {
         <Self as core::ops::Deref>::Target::FIELD_OFFSETS.font_family.apply_pin(*self).get()
@@ -1140,8 +1124,7 @@ impl Item for TextInput {
     ) -> HighLevelRenderingPrimitive {
         HighLevelRenderingPrimitive::Text {
             text: Self::FIELD_OFFSETS.text.apply_pin(self).get(),
-            font_family: Self::FIELD_OFFSETS.font_family.apply_pin(self).get(),
-            font_size: TextInput::font_pixel_size(self, window),
+            font_request: self.font_request(window),
         }
     }
 
@@ -1369,17 +1352,6 @@ impl Item for TextInput {
     }
 }
 
-impl TextInput {
-    fn font_pixel_size(self: Pin<&Self>, window: &ComponentWindow) -> f32 {
-        let font_size = Self::FIELD_OFFSETS.font_size.apply_pin(self).get();
-        if font_size == 0.0 {
-            DEFAULT_FONT_SIZE * window.scale_factor()
-        } else {
-            font_size
-        }
-    }
-}
-
 impl ItemConsts for TextInput {
     const cached_rendering_data_offset: const_field_offset::FieldOffset<
         TextInput,

sixtyfps_runtime/rendering_backends/gl/glyphcache.rs

@@ -12,9 +12,7 @@ use super::texture::{AtlasAllocation, TextureAtlas};
 use super::Vertex;
 use collections::hash_map::HashMap;
 use itertools::Itertools;
-use sixtyfps_corelib::font::Font;
-use sixtyfps_corelib::font::FontHandle;
-use sixtyfps_corelib::SharedString;
+use sixtyfps_corelib::font::{Font, FontHandle, FontRequest};
 use std::cell::RefCell;
 use std::{collections, rc::Rc};
 
@@ -28,13 +26,8 @@ pub(crate) struct GlyphCache {
 }
 
 impl GlyphCache {
-    pub fn find_font(
-        &self,
-        font_family: &SharedString,
-        pixel_size: f32,
-    ) -> Rc<RefCell<CachedFontGlyphs>> {
-        let font =
-            sixtyfps_corelib::font::FONT_CACHE.with(|fc| fc.find_font(font_family, pixel_size));
+    pub fn find_font(&self, request: &FontRequest) -> Rc<RefCell<CachedFontGlyphs>> {
+        let font = sixtyfps_corelib::font::FONT_CACHE.with(|fc| fc.find_font(request));
 
         let font_handle = font.handle();
 

sixtyfps_runtime/rendering_backends/gl/lib.rs

@@ -14,7 +14,7 @@ use lyon::tessellation::{
     FillAttributes, FillOptions, FillTessellator, StrokeAttributes, StrokeOptions,
     StrokeTessellator,
 };
-use sixtyfps_corelib::{eventloop::ComponentWindow, SharedString};
+use sixtyfps_corelib::{eventloop::ComponentWindow, font::FontRequest};
 use sixtyfps_corelib::{
     graphics::{
         Color, Frame as GraphicsFrame, GraphicsBackend, GraphicsWindow,
@@ -532,8 +532,8 @@ impl RenderingPrimitivesBuilder for GLRenderingPrimitivesBuilder {
                         Resource::None => SmallVec::new(),
                     }
                 }
-                HighLevelRenderingPrimitive::Text { text, font_family, font_size } => {
-                    smallvec![self.create_glyph_runs(text, font_family, *font_size)]
+                HighLevelRenderingPrimitive::Text { text, font_request } => {
+                    smallvec![self.create_glyph_runs(text, font_request)]
                 }
                 HighLevelRenderingPrimitive::Path { width, height, elements, stroke_width } => {
                     let mut primitives = SmallVec::new();
@@ -725,10 +725,9 @@ impl GLRenderingPrimitivesBuilder {
     fn create_glyph_runs(
         &mut self,
         text: &str,
-        font_family: &SharedString,
-        pixel_size: f32,
+        font_request: &FontRequest,
     ) -> GLRenderingPrimitive {
-        let cached_glyphs = self.platform_data.glyph_cache.find_font(font_family, pixel_size);
+        let cached_glyphs = self.platform_data.glyph_cache.find_font(font_request);
         let mut cached_glyphs = cached_glyphs.borrow_mut();
         let mut atlas = self.texture_atlas.borrow_mut();
         let glyphs_runs = cached_glyphs.render_glyphs(&self.context, &mut atlas, text);
@@ -739,11 +738,9 @@ impl GLRenderingPrimitivesBuilder {
     fn create_glyph_runs(
         &mut self,
         text: &str,
-        font_family: &SharedString,
-        pixel_size: f32,
+        font_request: &FontRequest,
     ) -> GLRenderingPrimitive {
-        let font =
-            sixtyfps_corelib::font::FONT_CACHE.with(|fc| fc.find_font(font_family, pixel_size));
+        let font = sixtyfps_corelib::font::FONT_CACHE.with(|fc| fc.find_font(font_request));
         let text_canvas = font.render_text(text);
 
         let texture = Rc::new(GLTexture::new_from_canvas(&self.context, &text_canvas));