feat: implement configurable freetype load flags

src/build/fish_completions.zig

@@ -12,7 +12,7 @@ pub const fish_completions = comptimeGenerateFishCompletions();
 
 fn comptimeGenerateFishCompletions() []const u8 {
     comptime {
-        @setEvalBranchQuota(17000);
+        @setEvalBranchQuota(18000);
         var counter = std.io.countingWriter(std.io.null_writer);
         try writeFishCompletions(&counter.writer());
 

src/build/mdgen/mdgen.zig

@@ -26,7 +26,7 @@ pub fn genConfig(writer: anytype, cli: bool) !void {
         \\
     );
 
-    @setEvalBranchQuota(2000);
+    @setEvalBranchQuota(3000);
     inline for (@typeInfo(Config).Struct.fields) |field| {
         if (field.name[0] == '_') continue;
 

src/config/Config.zig

@@ -287,6 +287,26 @@ const c = @cImport({
 /// terminals. Only new terminals will use the new configuration.
 @"grapheme-width-method": GraphemeWidthMethod = .unicode,
 
+/// Freetype load flags to enable. The format of this is a list of flags to
+/// enable separated by commas. If you prefix a flag with `no-` then it is
+/// disabled. If you omit a flag, it's default value is used, so you must
+/// explicitely disable flags you don't want. You can also use `true` or `false`
+/// to turn all flags on or off.
+///
+/// Available flags:
+///
+///   * `hinting` - Enable or disable hinting, enabled by default.
+///   * `bitmap` - Enable or disable loading of any pre-rendered bitmap strikes,
+///     enabled by default
+///   * `force-autohint` - Use the freetype auto-hinter rather than the font's
+///     native hinter. Enabled by default.
+///   * `monochrome` - Instructs renderer to use 1-bit monochrome rendering.
+///     This option doesn't impact the hinter. Enabled by default.
+///   * `autohint` - Use the freetype auto-hinter. Enabled by default.
+///
+/// Example: `hinting`, `no-hinting`, `force-autohint`, `no-force-autohint`
+@"freetype-load-flag": FreetypeLoadFlags = .{},
+
 /// A theme to use. If the theme is an absolute pathname, Ghostty will attempt
 /// to load that file as a theme. If that file does not exist or is inaccessible,
 /// an error will be logged and no other directories will be searched.
@@ -4565,6 +4585,15 @@ pub const GraphemeWidthMethod = enum {
     unicode,
 };
 
+/// See freetype-load-flag
+pub const FreetypeLoadFlags = packed struct  {
+    hinting: bool = true,
+    bitmap: bool = true,
+    @"force-autohint": bool = false,
+    monochrome: bool = false,
+    autohint: bool = true,
+};
+
 /// See linux-cgroup
 pub const LinuxCgroup = enum {
     never,

src/font/face.zig

@@ -2,6 +2,7 @@ const std = @import("std");
 const builtin = @import("builtin");
 const options = @import("main.zig").options;
 pub const Metrics = @import("face/Metrics.zig");
+const FreetypeLoadFlags = @import("../config/Config.zig").FreetypeLoadFlags;
 const freetype = @import("face/freetype.zig");
 const coretext = @import("face/coretext.zig");
 pub const web_canvas = @import("face/web_canvas.zig");
@@ -90,6 +91,8 @@ pub const RenderOptions = struct {
     ///
     /// This only works with CoreText currently.
     thicken: bool = false,
+
+    load_flags: FreetypeLoadFlags,
 };
 
 test {

src/font/face/freetype.zig

@@ -318,7 +318,13 @@ pub const Face = struct {
             //
             // This must be enabled for color faces though because those are
             // often colored bitmaps, which we support.
-            .no_bitmap = !self.face.hasColor(),
+            .no_bitmap = !self.face.hasColor() or !opts.load_flags.bitmap,
+
+            // use options from config
+            .no_hinting = !opts.load_flags.hinting,
+            .force_autohint = !opts.load_flags.@"force-autohint",
+            .monochrome = !opts.load_flags.monochrome,
+            .no_autohint = !opts.load_flags.autohint,
         });
         const glyph = self.face.handle.*.glyph;
 

src/renderer/Metal.zig

@@ -354,6 +354,7 @@ pub const DerivedConfig = struct {
     font_thicken: bool,
     font_features: std.ArrayListUnmanaged([:0]const u8),
     font_styles: font.CodepointResolver.StyleStatus,
+    load_flags: configpkg.Config.FreetypeLoadFlags,
     cursor_color: ?terminal.color.RGB,
     cursor_invert: bool,
     cursor_opacity: f64,
@@ -399,11 +400,14 @@ pub const DerivedConfig = struct {
 
         const cursor_invert = config.@"cursor-invert-fg-bg";
 
+        const load_flags = config.@"freetype-load-flag";
+
         return .{
             .background_opacity = @max(0, @min(1, config.@"background-opacity")),
             .font_thicken = config.@"font-thicken",
             .font_features = font_features,
             .font_styles = font_styles,
+            .load_flags = load_flags,
 
             .cursor_color = if (!cursor_invert and config.@"cursor-color" != null)
                 config.@"cursor-color".?.toTerminalRGB()
@@ -2719,6 +2723,7 @@ fn addUnderline(
         .{
             .cell_width = 1,
             .grid_metrics = self.grid_metrics,
+            .load_flags = self.config.load_flags,
         },
     );
 
@@ -2751,6 +2756,7 @@ fn addOverline(
         .{
             .cell_width = 1,
             .grid_metrics = self.grid_metrics,
+            .load_flags = self.config.load_flags,
         },
     );
 
@@ -2783,6 +2789,7 @@ fn addStrikethrough(
         .{
             .cell_width = 1,
             .grid_metrics = self.grid_metrics,
+            .load_flags = self.config.load_flags,
         },
     );
 
@@ -2822,6 +2829,7 @@ fn addGlyph(
         .{
             .grid_metrics = self.grid_metrics,
             .thicken = self.config.font_thicken,
+            .load_flags = self.config.load_flags,
         },
     );
 
@@ -2901,6 +2909,7 @@ fn addCursor(
                 .{
                     .cell_width = if (wide) 2 else 1,
                     .grid_metrics = self.grid_metrics,
+                    .load_flags = self.config.load_flags,
                 },
             ) catch |err| {
                 log.warn("error rendering cursor glyph err={}", .{err});
@@ -2916,6 +2925,7 @@ fn addCursor(
             .{
                 .cell_width = if (wide) 2 else 1,
                 .grid_metrics = self.grid_metrics,
+                .load_flags = self.config.load_flags,
             },
         ) catch |err| {
             log.warn("error rendering cursor glyph err={}", .{err});
@@ -2956,7 +2966,7 @@ fn addPreeditCell(
         @intCast(cp.codepoint),
         .regular,
         .text,
-        .{ .grid_metrics = self.grid_metrics },
+        .{ .grid_metrics = self.grid_metrics, .load_flags = self.config.load_flags },
     ) catch |err| {
         log.warn("error rendering preedit glyph err={}", .{err});
         return;

src/renderer/OpenGL.zig

@@ -11,6 +11,7 @@ const ArenaAllocator = std.heap.ArenaAllocator;
 const link = @import("link.zig");
 const isCovering = @import("cell.zig").isCovering;
 const fgMode = @import("cell.zig").fgMode;
+const freetype = @import("freetype").Face;
 const shadertoy = @import("shadertoy.zig");
 const apprt = @import("../apprt.zig");
 const configpkg = @import("../config.zig");
@@ -288,6 +289,7 @@ pub const DerivedConfig = struct {
     font_thicken: bool,
     font_features: std.ArrayListUnmanaged([:0]const u8),
     font_styles: font.CodepointResolver.StyleStatus,
+    load_flags: configpkg.Config.FreetypeLoadFlags,
     cursor_color: ?terminal.color.RGB,
     cursor_invert: bool,
     cursor_text: ?terminal.color.RGB,
@@ -332,11 +334,14 @@ pub const DerivedConfig = struct {
 
         const cursor_invert = config.@"cursor-invert-fg-bg";
 
+        const load_flags = config.@"freetype-load-flag";
+
         return .{
             .background_opacity = @max(0, @min(1, config.@"background-opacity")),
             .font_thicken = config.@"font-thicken",
             .font_features = font_features,
             .font_styles = font_styles,
+            .load_flags = load_flags,
 
             .cursor_color = if (!cursor_invert and config.@"cursor-color" != null)
                 config.@"cursor-color".?.toTerminalRGB()
@@ -1765,7 +1770,7 @@ fn addPreeditCell(
         @intCast(cp.codepoint),
         .regular,
         .text,
-        .{ .grid_metrics = self.grid_metrics },
+        .{ .grid_metrics = self.grid_metrics, .load_flags = self.config.load_flags },
     ) catch |err| {
         log.warn("error rendering preedit glyph err={}", .{err});
         return;
@@ -1866,6 +1871,7 @@ fn addCursor(
                 .{
                     .cell_width = if (wide) 2 else 1,
                     .grid_metrics = self.grid_metrics,
+                    .load_flags = self.config.load_flags,
                 },
             ) catch |err| {
                 log.warn("error rendering cursor glyph err={}", .{err});
@@ -1881,6 +1887,7 @@ fn addCursor(
             .{
                 .cell_width = if (wide) 2 else 1,
                 .grid_metrics = self.grid_metrics,
+                .load_flags = self.config.load_flags,
             },
         ) catch |err| {
             log.warn("error rendering cursor glyph err={}", .{err});
@@ -1943,6 +1950,7 @@ fn addUnderline(
         .{
             .cell_width = 1,
             .grid_metrics = self.grid_metrics,
+            .load_flags = self.config.load_flags,
         },
     );
 
@@ -1984,6 +1992,7 @@ fn addOverline(
         .{
             .cell_width = 1,
             .grid_metrics = self.grid_metrics,
+            .load_flags = self.config.load_flags,
         },
     );
 
@@ -2025,6 +2034,7 @@ fn addStrikethrough(
         .{
             .cell_width = 1,
             .grid_metrics = self.grid_metrics,
+            .load_flags = self.config.load_flags,
         },
     );
 
@@ -2073,6 +2083,7 @@ fn addGlyph(
         .{
             .grid_metrics = self.grid_metrics,
             .thicken = self.config.font_thicken,
+            .load_flags = self.config.load_flags,
         },
     );