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face: web canvas can render grapheme clusters

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This commit is contained in:
Mitchell Hashimoto
2022-12-12 21:40:54 -08:00
parent a1dda2c37f
commit bc74033ad6
1 changed files with 20 additions and 2 deletions
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22
src/font/face/web_canvas.zig
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@ -107,6 +107,12 @@ pub const Face = struct {
/// have access to the underlying tables anyways. We let the browser deal
/// with bad codepoints.
pub fn glyphIndex(self: Face, cp: u32) ?u32 {
// If this is a multi-codepoint grapheme then we only check if
// we actually know about it.
if (cp >= grapheme_start) {
if (!self.glyph_to_grapheme.contains(cp)) return null;
}
// Render the glyph to determine if it is colored or not. We
// have to do this because the browser will always try to render
// whatever we give it and we have no API to determine color.
@ -342,8 +348,20 @@ pub const Face = struct {
) !RenderedGlyph {
// Encode our glyph to UTF-8 so we can build a JS string out of it.
var utf8: [4]u8 = undefined;
const utf8_len = try std.unicode.utf8Encode(@intCast(u21, glyph_index), &utf8);
const glyph_str = js.string(utf8[0..utf8_len]);
const glyph_str = glyph_str: {
// If we are a normal glyph then we are a single codepoint and
// we just UTF8 encode it as-is.
if (glyph_index < grapheme_start) {
const utf8_len = try std.unicode.utf8Encode(@intCast(u21, glyph_index), &utf8);
break :glyph_str js.string(utf8[0..utf8_len]);
}
// We are a multi-codepoint glyph so we have to read the glyph
// from the map and it is already utf8 encoded.
const slice = self.glyph_to_grapheme.get(glyph_index) orelse
return error.UnknownGraphemeCluster;
break :glyph_str js.string(slice);
};
// Get our drawing context
const measure_ctx = try self.context();