migrations/egui
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Handle having no fonts (missing "default_fonts" feature) without a crash

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This commit is contained in:
Emil Ernerfeldt
2021-10-20 15:40:06 +02:00
parent 19a2a57f80
commit 087c6695bb
2 changed files with 10 additions and 5 deletions
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9
epaint/src/text/font.rs
View File

@@ -215,7 +215,7 @@ impl Font {
fonts, fonts,
characters: RwLock::new(None), characters: RwLock::new(None),
replacement_glyph: Default::default(), replacement_glyph: Default::default(),
pixels_per_point: 0.0, pixels_per_point: 1.0,
row_height: 0.0, row_height: 0.0,
glyph_info_cache: Default::default(), glyph_info_cache: Default::default(),
}; };
@@ -318,10 +318,13 @@ impl Font {
} }
#[inline] #[inline]
pub(crate) fn glyph_info_and_font_impl(&self, c: char) -> (&FontImpl, GlyphInfo) { pub(crate) fn glyph_info_and_font_impl(&self, c: char) -> (Option<&FontImpl>, GlyphInfo) {
if self.fonts.is_empty() {
return (None, self.replacement_glyph.1);
}
let (font_index, glyph_info) = self.glyph_info(c); let (font_index, glyph_info) = self.glyph_info(c);
let font_impl = &self.fonts[font_index]; let font_impl = &self.fonts[font_index];
(font_impl, glyph_info) (Some(font_impl), glyph_info)
} }
fn glyph_info_no_cache_or_fallback(&self, c: char) -> Option<(FontIndex, GlyphInfo)> { fn glyph_info_no_cache_or_fallback(&self, c: char) -> Option<(FontIndex, GlyphInfo)> {

6
epaint/src/text/text_layout.rs
View File

@@ -72,8 +72,10 @@ fn layout_section(
paragraph.empty_paragraph_height = font_height; // TODO: replace this hack with actually including `\n` in the glyphs? paragraph.empty_paragraph_height = font_height; // TODO: replace this hack with actually including `\n` in the glyphs?
} else { } else {
let (font_impl, glyph_info) = font.glyph_info_and_font_impl(chr); let (font_impl, glyph_info) = font.glyph_info_and_font_impl(chr);
if let Some(last_glyph_id) = last_glyph_id { if let Some(font_impl) = font_impl {
paragraph.cursor_x += font_impl.pair_kerning(last_glyph_id, glyph_info.id) if let Some(last_glyph_id) = last_glyph_id {
paragraph.cursor_x += font_impl.pair_kerning(last_glyph_id, glyph_info.id)
}
} }
paragraph.glyphs.push(Glyph { paragraph.glyphs.push(Glyph {