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coretext: fix emoji placement

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This commit is contained in:
Mitchell Hashimoto
2023-06-30 17:12:24 -07:00
parent c52dc229f3
commit 55254acaad
1 changed files with 24 additions and 1 deletions
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25
src/font/face/coretext.zig
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@ -215,7 +215,7 @@ pub const Face = struct {
});
ctx.setAllowsFontSmoothing(true);
ctx.setShouldSmoothFonts(true); // The amadeus "enthicken"
ctx.setShouldSmoothFonts(false); // The amadeus "enthicken"
ctx.setAllowsFontSubpixelQuantization(true);
ctx.setShouldSubpixelQuantizeFonts(true);
ctx.setAllowsFontSubpixelPositioning(true);
@ -247,6 +247,18 @@ pub const Face = struct {
atlas.set(region, buf);
const offset_y: i32 = 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 (color.color) {
break :offset_y @intFromFloat(self.metrics.cell_height);
}
// Our Y coordinate in 3D is (0, 0) bottom left, +y is UP.
// We need to calculate our baseline from the bottom of a cell.
const baseline_from_bottom = self.metrics.cell_height - self.metrics.cell_baseline;
@ -258,6 +270,17 @@ pub const Face = struct {
break :offset_y @intFromFloat(@ceil(baseline_with_offset));
};
log.warn("FONT FONT FONT width={} height={} render_x={} render_y={} offset_y={} ascent={} cell_height={} cell_baseline={}", .{
glyph_width,
glyph_height,
render_x,
render_y,
offset_y,
glyph_ascent,
self.metrics.cell_height,
self.metrics.cell_baseline,
});
return .{
.width = glyph_width,
.height = glyph_height,