fix(pkg/freetype): fully correct load flags

These now properly match the FreeType API- compared directly in the unit
tests against the values provided by the FreeType header itself.

This was ridiculously wrong before, like... wow.

pkg/freetype/face.zig

@@ -252,8 +252,12 @@ pub const RenderMode = enum(c_uint) {
     sdf = c.FT_RENDER_MODE_SDF,
 };
 
-/// A list of bit field constants for FT_Load_Glyph to indicate what kind of
-/// operations to perform during glyph loading.
+/// A collection of flags for FT_Load_Glyph that indicate
+/// what kind of operations to perform during glyph loading.
+///
+/// Some of these flags are not included in the official FreeType
+/// documentation, but are nevertheless present and named in the
+/// header, so the names have been copied from there.
 pub const LoadFlags = packed struct(c_int) {
     no_scale: bool = false,
     no_hinting: bool = false,
@@ -263,7 +267,7 @@ pub const LoadFlags = packed struct(c_int) {
     force_autohint: bool = false,
     crop_bitmap: bool = false,
     pedantic: bool = false,
-    _padding1: u1 = 0,
+    advance_only: bool = false,
     ignore_global_advance_width: bool = false,
     no_recurse: bool = false,
     ignore_transform: bool = false,
@@ -271,17 +275,13 @@ pub const LoadFlags = packed struct(c_int) {
     linear_design: bool = false,
     sbits_only: bool = false,
     no_autohint: bool = false,
-    target_normal: bool = false,
-    target_light: bool = false,
-    target_mono: bool = false,
-    target_lcd: bool = false,
+    target: Target = .normal,
     color: bool = false,
-    target_lcd_v: bool = false,
     compute_metrics: bool = false,
     bitmap_metrics_only: bool = false,
-    _padding2: u1 = 0,
+    svg_only: bool = false,
     no_svg: bool = false,
-    _padding3: u6 = 0,
+    _padding: u7 = 0,
 
     pub const Target = enum(u4) {
         normal = 0,

src/font/face/freetype.zig

@@ -376,11 +376,15 @@ pub const Face = struct {
             // If we're gonna be rendering this glyph in monochrome,
             // then we should use the monochrome hinter as well, or
             // else it won't look very good at all.
-            .target_mono = self.load_flags.monochrome,
-
-            // Otherwise we select hinter based on the `light` flag.
-            .target_normal = !self.load_flags.light and !self.load_flags.monochrome,
-            .target_light = self.load_flags.light and !self.load_flags.monochrome,
+            //
+            // Otherwise if the user asked for light hinting we
+            // use that, otherwise we just use the normal target.
+            .target = if (self.load_flags.monochrome)
+                .mono
+            else if (self.load_flags.light)
+                .light
+            else
+                .normal,
 
             // NO_SVG set to true because we don't currently support rendering
             // SVG glyphs under FreeType, since that requires bundling another