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font: add Windows font discovery backend

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Adds a FreeType-based Discover implementation for Windows that walks
the system (C:\Windows\Fonts) and per-user
(%LOCALAPPDATA%\Microsoft\Windows\Fonts) font directories, matching
descriptors via family_name / SFNT name table and optionally codepoint
presence.

Wired up as a new .freetype_windows backend which Backend.default() now
returns on Windows. Existing freetype-only paths are untouched.

With this in place, standard code paths -- +list-fonts, SharedGridSet
font-family lookup, CodepointResolver fallback -- work on Windows
without any os.tag == .windows branches in the caller.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yasuhiro Matsumoto
2026-04-23 13:32:49 +09:00
parent e88c6c0991
commit 61fce4d0a4
8 changed files with 339 additions and 7 deletions
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15
src/cli/list_fonts.zig
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@@ -4,6 +4,7 @@ const ArenaAllocator = std.heap.ArenaAllocator;
const Action = @import("ghostty.zig").Action;
const args = @import("args.zig");
const font = @import("../font/main.zig");
const discovery = @import("../font/discovery.zig");
const log = std.log.scoped(.list_fonts);
@@ -100,8 +101,18 @@ fn runArgs(alloc_gpa: Allocator, argsIter: anytype) !u8 {
var families: std.ArrayList([]const u8) = .empty;
var map: std.StringHashMap(std.ArrayListUnmanaged([]const u8)) = .init(alloc);
// Look up all available fonts
var disco = font.Discover.init();
// Look up all available fonts. The Windows backend needs a FreeType
// library handle so it can open candidate font files while scanning
// the system/user font directories.
var font_lib = if (comptime font.Discover == discovery.Windows)
try font.Library.init(alloc)
else {};
defer if (comptime font.Discover == discovery.Windows) font_lib.deinit();
var disco = if (comptime font.Discover == discovery.Windows)
font.Discover.init(font_lib)
else
font.Discover.init();
defer disco.deinit();
var disco_it = try disco.discover(alloc, .{
.family = config.family,