Fix emoji glyph advance

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- FreeType proportional font metrics using `RasterizedGlyph::advance` and `Rasterize::kerning`
+
 ### Changed
 
 - Minimum Rust version has been bumped to 1.56.0

src/ft/mod.rs

@@ -203,8 +203,8 @@ impl Rasterize for FreeTypeRasterizer {
             }
         }
 
-        // Transform glyphs with the matrix from Fontconfig. Primarily used to generate italics.
         let advance = unsafe {
+            // Transform glyphs with the matrix from Fontconfig. Primarily used to generate italics.
             let raw_glyph = face.ft_face.raw().glyph;
             if let Some(matrix) = face.matrix.as_ref() {
                 // Check that the glyph is a vectorial outline, not a bitmap.
@@ -250,6 +250,10 @@ impl Rasterize for FreeTypeRasterizer {
                     },
                 };
 
+                // Scale glyph advance.
+                rasterized_glyph.advance.0 = (advance.0 as f64 * fixup_factor) as i32;
+                rasterized_glyph.advance.1 = (advance.1 as f64 * fixup_factor) as i32;
+
                 rasterized_glyph = downsample_bitmap(rasterized_glyph, fixup_factor);
             }