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[fontations] Render nothing if palette index out of range

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Matches ot. Ft crashes currently.
This commit is contained in:
Behdad Esfahbod 2025-03-06 17:25:56 -07:00
parent cd45a7f531
commit ad9fa13d23
1 changed files with 10 additions and 5 deletions
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15
src/fontations/lib.rs
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@ -375,17 +375,22 @@ impl HbColorPainter<'_> {
}
fn lookup_color(&self, color_index: u16, alpha: f32) -> hb_color_t {
if color_index == 0xFFFF {
// Apply alpha to foreground color
return ((self.foreground & 0xFFFFFF00)
| (((self.foreground & 0xFF) as f32 * alpha).round() as u32))
as hb_color_t;
}
let c = self.color_records.get(color_index as usize);
if let Some(c) = c.filter(|_| color_index != 0xFFFF) {
if c.is_some() {
let c = c.unwrap();
(((c.blue as u32) << 24)
| ((c.green as u32) << 16)
| ((c.red as u32) << 8)
| ((c.alpha as f32 * alpha).round() as u32)) as hb_color_t
} else {
// Apply alpha to foreground color
((self.foreground & 0xFFFFFF00)
| (((self.foreground & 0xFF) as f32 * alpha).round() as u32))
as hb_color_t
0 as hb_color_t
}
}