pkg/macos: font initializes, get glyphs

pkg/macos/foundation/string.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
 const foundation = @import("../foundation.zig");
 const c = @import("c.zig");
@@ -100,6 +101,14 @@ pub const StringEncoding = enum(u32) {
     utf32_le = 0x1c000100,
 };
 
+pub fn stringGetSurrogatePairForLongCharacter(
+    ch: u32,
+    surrogates: []u16,
+) bool {
+    assert(surrogates.len >= 2);
+    return c.CFStringGetSurrogatePairForLongCharacter(ch, surrogates.ptr) == 1;
+}
+
 test "string" {
     const testing = std.testing;
 
@@ -119,3 +128,10 @@ test "string" {
         try testing.expectEqualStrings("hello world", cstr);
     }
 }
+
+test "unichar" {
+    const testing = std.testing;
+
+    var unichars: [2]u16 = undefined;
+    try testing.expect(!stringGetSurrogatePairForLongCharacter('A', &unichars));
+}

pkg/macos/graphics.zig

@@ -0,0 +1,6 @@
+pub const c = @import("graphics/c.zig");
+pub usingnamespace @import("graphics/font.zig");
+
+test {
+    @import("std").testing.refAllDecls(@This());
+}

pkg/macos/graphics/c.zig

@@ -0,0 +1,3 @@
+pub usingnamespace @cImport({
+    @cInclude("CoreGraphics/CoreGraphics.h");
+});

pkg/macos/graphics/font.zig

@@ -0,0 +1,3 @@
+const c = @import("c.zig");
+
+pub const Glyph = c.CGGlyph;

pkg/macos/main.zig

@@ -1,4 +1,5 @@
 pub const foundation = @import("foundation.zig");
+pub const graphics = @import("graphics.zig");
 pub const text = @import("text.zig");
 
 test {

pkg/macos/text.zig

@@ -1,3 +1,4 @@
+pub usingnamespace @import("text/font.zig");
 pub usingnamespace @import("text/font_collection.zig");
 pub usingnamespace @import("text/font_descriptor.zig");
 

pkg/macos/text/font.zig

@@ -0,0 +1,53 @@
+const std = @import("std");
+const assert = std.debug.assert;
+const Allocator = std.mem.Allocator;
+const foundation = @import("../foundation.zig");
+const graphics = @import("../graphics.zig");
+const text = @import("../text.zig");
+const c = @import("c.zig");
+
+pub const Font = opaque {
+    pub fn createWithFontDescriptor(desc: *text.FontDescriptor, size: f32) Allocator.Error!*Font {
+        return @intToPtr(
+            ?*Font,
+            @ptrToInt(c.CTFontCreateWithFontDescriptor(
+                @ptrCast(c.CTFontDescriptorRef, desc),
+                size,
+                null,
+            )),
+        ) orelse Allocator.Error.OutOfMemory;
+    }
+
+    pub fn release(self: *Font) void {
+        c.CFRelease(self);
+    }
+
+    pub fn getGlyphsForCharacters(self: *Font, chars: []const u16, glyphs: []graphics.Glyph) bool {
+        assert(chars.len == glyphs.len);
+        return c.CTFontGetGlyphsForCharacters(
+            @ptrCast(c.CTFontRef, self),
+            chars.ptr,
+            glyphs.ptr,
+            @intCast(c_long, chars.len),
+        );
+    }
+};
+
+test {
+    const testing = std.testing;
+
+    const name = try foundation.String.createWithBytes("Monaco", .utf8, false);
+    defer name.release();
+    const desc = try text.FontDescriptor.createWithNameAndSize(name, 12);
+    defer desc.release();
+
+    const font = try Font.createWithFontDescriptor(desc, 12);
+    defer font.release();
+
+    var glyphs = [1]graphics.Glyph{0};
+    try testing.expect(font.getGlyphsForCharacters(
+        &[_]u16{'A'},
+        &glyphs,
+    ));
+    try testing.expect(glyphs[0] > 0);
+}