comments

src/title/ab_glyph_renderer.rs

@@ -80,6 +80,8 @@ impl AbGlyphTitleText {
 
         let glyphs = self.layout(&font);
         let last_glyph = glyphs.last()?;
+        // + 2 because ab_glyph likes to draw outside of its area,
+        // so we add 1px border around the pixmap
         let width = (last_glyph.position.x + font.h_advance(last_glyph.id)).ceil() as u32 + 2;
         let height = font.height().ceil() as u32 + 2;
 
@@ -97,6 +99,7 @@ impl AbGlyphTitleText {
                     // same as 1.0. For our purposes, we need to contrain this value.
                     let c = c.min(1.0);
 
+                    // offset the index by 1, so it is in the center of the pixmap
                     let p_idx = (top + y + 1) * width + (left + x + 1);
                     let old_alpha_u8 = pixels[p_idx as usize].alpha();
                     let new_alpha = c + (old_alpha_u8 as f32 / 255.0);