feat: init fonts

Author: RossComputerGuy

src/phantom.zig

@@ -1,6 +1,7 @@
 const root = @import("root");
 
 pub const display = @import("phantom/display.zig");
+pub const fonts = @import("phantom/fonts.zig");
 pub const gpu = @import("phantom/gpu.zig");
 pub const math = @import("phantom/math.zig");
 pub const painting = @import("phantom/painting.zig");

src/phantom/fonts.zig

@@ -0,0 +1 @@
+pub const Font = @import("fonts/font.zig");

src/phantom/fonts/font.zig

@@ -0,0 +1,33 @@
+const std = @import("std");
+const painting = @import("../painting.zig");
+const vizops = @import("vizops");
+const Self = @This();
+
+pub const Glyph = struct {
+    index: u32,
+    fb: *painting.fb.Base,
+    size: vizops.vector.Uint8Vector,
+    bearing: vizops.vector.Int8Vector,
+    advance: vizops.vector.Int8Vector,
+};
+
+pub const VTable = struct {
+    lookupGlyph: *const fn (*anyopaque, u21) anyerror!Glyph = null,
+    getSize: *const fn (*anyopaque) vizops.vector.UsizeVector2,
+    deinit: ?*const fn (*anyopaque) void = null,
+};
+
+vtable: *const VTable,
+ptr: *anyopaque,
+
+pub inline fn lookupGlyph(self: *Self, codepoint: u21) !Glyph {
+    return self.vtable.lookupGlyph(self.ptr, codepoint);
+}
+
+pub inline fn getSize(self: *Self) vizops.vector.UsizeVector2 {
+    return self.vtable.getSize(self.ptr);
+}
+
+pub inline fn deinit(self: *Self) void {
+    return if (self.vtable.deinit) |f| f(self.ptr) else {};
+}