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pkg/harfbuzz: use extern funcs for freetype interop

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This commit is contained in:
Mitchell Hashimoto
2022-08-28 14:47:47 -07:00
parent c377e19bd0
commit f42bac6bc4
1 changed files with 9 additions and 6 deletions
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15
pkg/harfbuzz/freetype.zig
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@ -5,6 +5,13 @@ const Face = @import("face.zig").Face;
const Font = @import("font.zig").Font; const Font = @import("font.zig").Font;
const Error = @import("errors.zig").Error; const Error = @import("errors.zig").Error;
// Use custom extern functions so that the proper freetype structs are used
// without a ptrcast. These are only needed when interacting with freetype
// C structs.
extern fn hb_ft_face_create_referenced(ft_face: freetype.c.FT_Face) ?*c.hb_face_t;
extern fn hb_ft_font_create_referenced(ft_face: freetype.c.FT_Face) ?*c.hb_font_t;
extern fn hb_ft_font_get_face(font: ?*c.hb_font_t) freetype.c.FT_Face;
/// Creates an hb_face_t face object from the specified FT_Face. /// Creates an hb_face_t face object from the specified FT_Face.
/// ///
/// This is the preferred variant of the hb_ft_face_create* function /// This is the preferred variant of the hb_ft_face_create* function
@ -15,17 +22,13 @@ const Error = @import("errors.zig").Error;
/// ///
/// Use this version unless you know you have good reasons not to. /// Use this version unless you know you have good reasons not to.
pub fn createFace(face: freetype.c.FT_Face) Error!Face { pub fn createFace(face: freetype.c.FT_Face) Error!Face {
const handle = c.hb_ft_face_create_referenced( const handle = hb_ft_face_create_referenced(face) orelse return Error.HarfbuzzFailed;
@ptrCast(c.FT_Face, face),
) orelse return Error.HarfbuzzFailed;
return Face{ .handle = handle }; return Face{ .handle = handle };
} }
/// Creates an hb_font_t font object from the specified FT_Face. /// Creates an hb_font_t font object from the specified FT_Face.
pub fn createFont(face: freetype.c.FT_Face) Error!Font { pub fn createFont(face: freetype.c.FT_Face) Error!Font {
const handle = c.hb_ft_font_create_referenced( const handle = hb_ft_font_create_referenced(face) orelse return Error.HarfbuzzFailed;
@ptrCast(c.FT_Face, face),
) orelse return Error.HarfbuzzFailed;
return Font{ .handle = handle }; return Font{ .handle = handle };
} }