Add a DrawString benchmark.

truetype/face_test.go

+// Copyright 2015 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"image"
+	"image/draw"
+	"io/ioutil"
+	"strings"
+	"testing"
+
+	"golang.org/x/exp/shiny/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func BenchmarkDrawString(b *testing.B) {
+	data, err := ioutil.ReadFile("../licenses/gpl.txt")
+	if err != nil {
+		b.Fatal(err)
+	}
+	lines := strings.Split(string(data), "\n")
+	data, err = ioutil.ReadFile("../testdata/luxisr.ttf")
+	if err != nil {
+		b.Fatal(err)
+	}
+	f, err := Parse(data)
+	if err != nil {
+		b.Fatal(err)
+	}
+	dst := image.NewRGBA(image.Rect(0, 0, 800, 600))
+	draw.Draw(dst, dst.Bounds(), image.White, image.ZP, draw.Src)
+	d := &font.Drawer{
+		Dst:  dst,
+		Src:  image.Black,
+		Face: NewFace(f, Options{}),
+	}
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for j, line := range lines {
+			d.Dot = fixed.P(0, (j*16)%600)
+			d.DrawString(line)
+		}
+	}
+}