fontconfig: font sets

pkg/fontconfig/font_set.zig

@@ -0,0 +1,39 @@
+const std = @import("std");
+const assert = std.debug.assert;
+const c = @import("c.zig");
+const Pattern = @import("pattern.zig").Pattern;
+
+pub const FontSet = opaque {
+    pub fn create() *FontSet {
+        return @ptrCast(*FontSet, c.FcFontSetCreate());
+    }
+
+    pub fn destroy(self: *FontSet) void {
+        c.FcFontSetDestroy(self.cval());
+    }
+
+    pub fn len(self: *FontSet) u32 {
+        return @intCast(u32, self.cval().nfont);
+    }
+
+    pub fn get(self: *FontSet, idx: usize) *Pattern {
+        assert(idx < self.len());
+        return @ptrCast(*Pattern, self.cval().fonts[idx]);
+    }
+
+    inline fn cval(self: *FontSet) *c.struct__FcFontSet {
+        return @ptrCast(
+            *c.struct__FcFontSet,
+            @alignCast(@alignOf(c.struct__FcFontSet), self),
+        );
+    }
+};
+
+test "create" {
+    const testing = std.testing;
+
+    var fs = FontSet.create();
+    defer fs.destroy();
+
+    try testing.expectEqual(@as(u32, 0), fs.len());
+}

pkg/fontconfig/main.zig

@@ -1,6 +1,7 @@
 pub const c = @import("c.zig");
 pub usingnamespace @import("init.zig");
 pub usingnamespace @import("config.zig");
+pub usingnamespace @import("font_set.zig");
 pub usingnamespace @import("object_set.zig");
 pub usingnamespace @import("pattern.zig");
 

pkg/fontconfig/pattern.zig

@@ -11,10 +11,15 @@ pub const Pattern = opaque {
     }
 
     pub fn destroy(self: *Pattern) void {
-        c.FcPatternDestroy(@ptrCast(
+        c.FcPatternDestroy(self.cval());
-            *c.struct__FcPattern,
+    }
-            self,
+
-        ));
+    pub fn print(self: *Pattern) void {
+        c.FcPatternPrint(self.cval());
+    }
+
+    inline fn cval(self: *Pattern) *c.struct__FcPattern {
+        return @ptrCast(*c.struct__FcPattern, self);
     }
 };