Ignore characters that are wrong in emoji-icon-font.ttf

Closes https://github.com/emilk/egui/issues/1284

epaint/src/text/font.rs

@@ -56,6 +56,7 @@ impl Default for GlyphInfo {
 /// A specific font with a size.
 /// The interface uses points as the unit for everything.
 pub struct FontImpl {
+    name: String,
     ab_glyph_font: ab_glyph::FontArc,
     /// Maximum character height
     scale_in_pixels: u32,
@@ -71,6 +72,7 @@ impl FontImpl {
     pub fn new(
         atlas: Arc<Mutex<TextureAtlas>>,
         pixels_per_point: f32,
+        name: String,
         ab_glyph_font: ab_glyph::FontArc,
         scale_in_pixels: u32,
         y_offset_points: f32,
@@ -91,6 +93,7 @@ impl FontImpl {
         let y_offset = (y_offset_points * pixels_per_point).round() / pixels_per_point;
 
         Self {
+            name,
             ab_glyph_font,
             scale_in_pixels,
             height_in_points,
@@ -101,14 +104,16 @@ impl FontImpl {
         }
     }
 
-    /// An un-ordered iterator over all supported characters.
-    fn characters(&self) -> impl Iterator<Item = char> + '_ {
-        use ab_glyph::Font as _;
-        self.ab_glyph_font
-            .codepoint_ids()
-            .map(|(_, chr)| chr)
-            .filter(|chr| {
-                !matches!(
+    fn ignore_character(&self, chr: char) -> bool {
+        if self.name == "emoji-icon-font" {
+            // HACK: https://github.com/emilk/egui/issues/1284 https://github.com/jslegers/emoji-icon-font/issues/18
+            // Don't show the wrong fullwidth capital letters:
+            if 'Ｓ' <= chr && chr <= 'Ｙ' {
+                return true;
+            }
+        }
+
+        matches!(
             chr,
             // Strip out a religious symbol with secondary nefarious interpretation:
             '\u{534d}' | '\u{5350}' |
@@ -116,7 +121,15 @@ impl FontImpl {
             // Ignore ubuntu-specific stuff in `Ubuntu-Light.ttf`:
             '\u{E0FF}' | '\u{EFFD}' | '\u{F0FF}' | '\u{F200}'
         )
-            })
+    }
+
+    /// An un-ordered iterator over all supported characters.
+    fn characters(&self) -> impl Iterator<Item = char> + '_ {
+        use ab_glyph::Font as _;
+        self.ab_glyph_font
+            .codepoint_ids()
+            .map(|(_, chr)| chr)
+            .filter(|&chr| !self.ignore_character(chr))
     }
 
     /// `\n` will result in `None`
@@ -127,9 +140,9 @@ impl FontImpl {
             }
         }
 
-        // Add new character:
-        use ab_glyph::Font as _;
-        let glyph_id = self.ab_glyph_font.glyph_id(c);
+        if self.ignore_character(c) {
+            return None;
+        }
 
         if c == '\t' {
             if let Some(space) = self.glyph_info(' ') {
@@ -142,6 +155,10 @@ impl FontImpl {
             }
         }
 
+        // Add new character:
+        use ab_glyph::Font as _;
+        let glyph_id = self.ab_glyph_font.glyph_id(c);
+
         if glyph_id.0 == 0 {
             if invisible_char(c) {
                 // hack
@@ -149,7 +166,7 @@ impl FontImpl {
                 self.glyph_info_cache.write().insert(c, glyph_info);
                 Some(glyph_info)
             } else {
-                None
+                None // unsupported character
             }
         } else {
             let glyph_info = allocate_glyph(

epaint/src/text/fonts.rs

@@ -714,6 +714,7 @@ impl FontImplCache {
                 Arc::new(FontImpl::new(
                     self.atlas.clone(),
                     self.pixels_per_point,
+                    font_name.to_owned(),
                     ab_glyph_font,
                     scale_in_pixels,
                     y_offset_points,