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font: calculate correct offset for non-scalable emoji fonts

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This commit is contained in:
Mitchell Hashimoto
2022-10-06 14:12:03 -07:00
parent 3b549e0709
commit 3a7e53e2e4
1 changed files with 19 additions and 5 deletions
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16
src/font/Face.zig
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@ -209,11 +209,25 @@ pub fn renderGlyph(self: Face, alloc: Allocator, atlas: *Atlas, glyph_index: u32
atlas.set(region, buffer);
}
const offset_y = offset_y: {
// For non-scalable colorized fonts, we assume they are pictographic
// and just center the glyph. So far this has only applied to emoji
// fonts. Emoji fonts don't always report a correct ascender/descender
// (mainly Apple Emoji) so we just center them. Also, since emoji font
// aren't scalable, cell_baseline is incorrect anyways.
//
// NOTE(mitchellh): I don't know if this is right, this doesn't
// _feel_ right, but it makes all my limited test cases work.
if (self.face.hasColor() and !self.face.isScalable()) {
break :offset_y @intCast(c_int, tgt_h);
}
// The Y offset is the offset of the top of our bitmap PLUS our
// baseline calculation. The baseline calculation is so that everything
// is properly centered when we render it out into a monospace grid.
// Note: we add here because our X/Y is actually reversed, adding goes UP.
const offset_y = glyph.*.bitmap_top + @floatToInt(c_int, self.metrics.cell_baseline);
break :offset_y glyph.*.bitmap_top + @floatToInt(c_int, self.metrics.cell_baseline);
};
// Store glyph metadata
return Glyph{