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font: if CoreText needs to allocate, stack allocate and log

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This commit is contained in:
Mitchell Hashimoto
2023-05-31 22:03:27 -07:00
parent d903e4a43b
commit 01de38b20d
1 changed files with 15 additions and 1 deletions
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16
src/font/DeferredFace.zig
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@ -113,7 +113,21 @@ pub fn name(self: DeferredFace) ![:0]const u8 {
.coretext, .coretext_freetype => if (self.ct) |ct| {
const display_name = ct.font.copyDisplayName();
return display_name.cstringPtr(.utf8) orelse "<unsupported internal encoding>";
return display_name.cstringPtr(.utf8) orelse unsupported: {
// "NULL if the internal storage of theString does not allow
// this to be returned efficiently." In this case, we need
// to allocate. But we can't return an allocated string because
// we don't have an allocator. Let's use the stack and log it.
var buf: [1024]u8 = undefined;
const buf_name = display_name.cstring(&buf, .utf8) orelse
"<not enough internal storage space>";
log.info(
"CoreText font required too much space to copy, value = {s}",
.{buf_name},
);
break :unsupported "<CoreText internal storage limited, see logs>";
};
},
.web_canvas => if (self.wc) |wc| return wc.font_str,