add text benchmarks

text/text_test.go

@@ -0,0 +1,63 @@
+package text_test
+
+import (
+	"fmt"
+	"math/rand"
+	"testing"
+	"unicode"
+
+	"golang.org/x/image/font/basicfont"
+	"golang.org/x/image/font/gofont/goregular"
+
+	"github.com/faiface/pixel"
+	"github.com/faiface/pixel/text"
+	"github.com/golang/freetype/truetype"
+)
+
+func BenchmarkNewAtlas(b *testing.B) {
+	runeSets := []struct {
+		name string
+		set  []rune
+	}{
+		{"ASCII", text.ASCII},
+		{"Latin", text.RangeTable(unicode.Latin)},
+	}
+
+	ttf, _ := truetype.Parse(goregular.TTF)
+	face := truetype.NewFace(ttf, &truetype.Options{
+		Size:              16,
+		GlyphCacheEntries: 1,
+	})
+
+	for _, runeSet := range runeSets {
+		b.Run(runeSet.name, func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_ = text.NewAtlas(face, runeSet.set)
+			}
+		})
+	}
+}
+
+func BenchmarkTextWrite(b *testing.B) {
+	runeSet := text.ASCII
+	atlas := text.NewAtlas(basicfont.Face7x13, runeSet)
+
+	lengths := []int{1, 10, 100, 1000}
+	chunks := make([][]byte, len(lengths))
+	for i := range chunks {
+		chunk := make([]rune, lengths[i])
+		for j := range chunks[i] {
+			chunk[j] = runeSet[rand.Intn(len(runeSet))]
+		}
+		chunks[i] = []byte(string(chunk))
+	}
+
+	for _, chunk := range chunks {
+		b.Run(fmt.Sprintf("%d", len(chunk)), func(b *testing.B) {
+			txt := text.New(pixel.ZV, atlas)
+			for i := 0; i < b.N; i++ {
+				txt.Write(chunk)
+			}
+		})
+	}
+}