xgb-render: update comments

prototypes/xgb-xrender.go

@@ -1,10 +1,18 @@
 package main
 
+// We could also easily use x/image/font/basicfont to load some glyphs into X,
+// relying on the fact that it is a vertical array of A8 masks. Though it only
+// supports ASCII and has but one size. Best just make a custom BDF loader,
+// those fonts have larger coverages and we would be in control. Though again,
+// they don't seem to be capable of antialiasing.
+
 import (
 	"fmt"
 	"github.com/BurntSushi/xgb"
 	"github.com/BurntSushi/xgb/render"
 	"github.com/BurntSushi/xgb/xproto"
+	// golang.org/x/image/font/opentype cannot render yet but the API is
+	// more or less the same.
 	"github.com/golang/freetype"
 	"github.com/golang/freetype/truetype"
 	"golang.org/x/image/font"