Fix WASM build: rename ScaledMetrics to StyledMetrics, fix web-sys API

- ScaledMetrics was renamed to StyledMetrics but canvas_renderer.rs and
  font.rs still referenced the old name
- web-sys 0.3.91 changed get_image_data params from f64 to i32

crates/epaint/src/text/canvas_renderer.rs

@@ -4,7 +4,7 @@ use wasm_bindgen::prelude::*;
 use wasm_bindgen::JsCast;
 use web_sys::{CanvasRenderingContext2d, HtmlCanvasElement};
 
-use crate::text::font::ScaledMetrics;
+use crate::text::font::StyledMetrics;
 
 /// Data for a glyph rendered via HTML5 canvas
 #[derive(Debug, Clone)]
@@ -63,7 +63,7 @@ impl CanvasGlyphRenderer {
     pub fn render_glyph(
         &mut self,
         chr: char,
-        metrics: &ScaledMetrics,
+        metrics: &StyledMetrics,
         font_families: &[String],
         bin: crate::text::font::SubpixelBin,
     ) -> Option<CanvasGlyphData> {
@@ -162,7 +162,7 @@ impl CanvasGlyphRenderer {
         // Extract image data (now at device pixel resolution)
         let image_data = self
             .context
-            .get_image_data(0.0, 0.0, width as f64, height as f64)
+            .get_image_data(0, 0, width as i32, height as i32)
             .ok()?;
 
         let rgba_data = image_data.data().0;
@@ -210,7 +210,7 @@ fn ensure_canvas_renderer() -> Result<(), JsValue> {
 /// Render a glyph using the thread-local canvas renderer
 pub fn render_glyph_with_canvas(
     chr: char,
-    metrics: &ScaledMetrics,
+    metrics: &StyledMetrics,
     font_families: &[String],
     bin: crate::text::font::SubpixelBin,
 ) -> Option<CanvasGlyphData> {

crates/epaint/src/text/font.rs

@@ -644,7 +644,7 @@ impl FontFace {
     #[cfg(target_arch = "wasm32")]
     fn try_allocate_canvas_glyph_static(
         atlas: &mut TextureAtlas,
-        metrics: &ScaledMetrics,
+        metrics: &StyledMetrics,
         chr: char,
         bin: SubpixelBin,
     ) -> Option<GlyphAllocation> {
@@ -826,7 +826,7 @@ fn invisible_char(c: char) -> bool {
 #[cfg(target_arch = "wasm32")]
 pub(super) fn allocate_canvas_glyph(
     atlas: &mut TextureAtlas,
-    metrics: &ScaledMetrics,
+    metrics: &StyledMetrics,
     canvas_data: crate::text::canvas_renderer::CanvasGlyphData,
 ) -> GlyphAllocation {
     use crate::text::canvas_renderer::CanvasGlyphData;

crates/epaint/src/text/text_layout.rs

@@ -176,7 +176,7 @@ fn layout_section(
 
     let mut last_glyph_id = None;
 
-    // Optimization: only recompute `ScaledMetrics` when the concrete `FontImpl` changes.
+    // Optimization: only recompute `StyledMetrics` when the concrete `FontImpl` changes.
     let mut current_font = FontFaceKey::INVALID;
     let mut current_font_face_metrics = StyledMetrics::default();