swrenderer: Don't overflow for font bigger than 256px

Fixes #7936

internal/compiler/passes.rs

@@ -279,6 +279,7 @@ pub async fn run_passes(
             });
 
             // This is not perfect, as this includes translations that may not be used.
+            #[cfg(feature = "bundle-translations")]
             if let Some(translation_builder) = doc.translation_builder.as_ref() {
                 translation_builder.collect_characters_seen(&mut characters_seen);
             }

internal/core/software_renderer/fonts/pixelfont.rs

@@ -65,8 +65,12 @@ impl GlyphRenderer for PixelFont {
             sdf: self.bitmap_font.sdf,
         })
     }
-    fn scale_delta(&self) -> super::Fixed<u16, 8> {
-        super::Fixed::from_integer(self.glyphs.pixel_size as u16) / self.pixel_size.get() as u16
+    fn scale_delta(&self) -> Fixed<u16, 8> {
+        Fixed::try_from_fixed(Fixed::<u32, 8>::from_fraction(
+            self.glyphs.pixel_size as u32,
+            self.pixel_size.get() as u32,
+        ))
+        .unwrap()
     }
 }
 

tests/screenshots/cases/software/basic/text.slint

@@ -28,4 +28,12 @@ export component TestCase inherits Window {
             font-italic: true;
         }
     }
+
+    // Issue #7936
+    Text {
+        text: "s";
+        font-size: 256px;
+        color: red;
+        opacity: 0.1;
+    }
 }