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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package opentype
import (
"image"
"testing"
"golang.org/x/image/font"
"golang.org/x/image/font/gofont/goregular"
"golang.org/x/image/font/sfnt"
"golang.org/x/image/math/fixed"
)
var (
regular font.Face
)
func init() {
font, err := sfnt.Parse(goregular.TTF)
if err != nil {
panic(err)
}
regular, err = NewFace(font, defaultFaceOptions())
if err != nil {
panic(err)
}
}
var runeTests = []struct {
r rune
advance fixed.Int26_6
dr image.Rectangle
}{
{' ', 213, image.Rect(0, 0, 0, 0)},
{'A', 512, image.Rect(0, -9, 8, 0)},
{'Á', 512, image.Rect(0, -12, 8, 0)},
{'Æ', 768, image.Rect(0, -9, 12, 0)},
{'i', 189, image.Rect(0, -9, 3, 0)},
{'x', 384, image.Rect(0, -7, 6, 0)},
}
func TestFaceGlyphAdvance(t *testing.T) {
for _, test := range runeTests {
got, ok := regular.GlyphAdvance(test.r)
if !ok {
t.Errorf("could not get glyph advance width for %q", test.r)
continue
}
if got != test.advance {
t.Errorf("%q: glyph advance width=%d. want=%d", test.r, got, test.advance)
continue
}
}
}
func TestFaceGlyphBounds(t *testing.T) {
for _, test := range runeTests {
bounds, advance, ok := regular.GlyphBounds(test.r)
if !ok {
t.Errorf("could not get glyph bounds for %q", test.r)
continue
}
// bounds must fit inside the draw rect.
testFixedBounds := fixed.R(test.dr.Min.X, test.dr.Min.Y,
test.dr.Max.X, test.dr.Max.Y)
if !bounds.In(testFixedBounds) {
t.Errorf("%q: glyph bounds %v must be inside %v", test.r, bounds, testFixedBounds)
continue
}
if advance != test.advance {
t.Errorf("%q: glyph advance width=%d. want=%d", test.r, advance, test.advance)
continue
}
}
}
func TestFaceGlyph(t *testing.T) {
dot := image.Pt(200, 500)
fixedDot := fixed.P(dot.X, dot.Y)
for _, test := range runeTests {
dr, mask, maskp, advance, ok := regular.Glyph(fixedDot, test.r)
if !ok {
t.Errorf("could not get glyph for %q", test.r)
continue
}
if got, want := dr, test.dr.Add(dot); got != want {
t.Errorf("%q: glyph draw rectangle=%d. want=%d", test.r, got, want)
continue
}
if got, want := mask.Bounds(), image.Rect(0, 0, dr.Dx(), dr.Dy()); got != want {
t.Errorf("%q: glyph mask rectangle=%d. want=%d", test.r, got, want)
continue
}
if maskp != (image.Point{}) {
t.Errorf("%q: glyph maskp=%d. want=%d", test.r, maskp, image.Point{})
continue
}
if advance != test.advance {
t.Errorf("%q: glyph advance width=%d. want=%d", test.r, advance, test.advance)
continue
}
}
}
func BenchmarkFaceGlyph(b *testing.B) {
fixedDot := fixed.P(200, 500)
r := 'A'
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, _, _, _, ok := regular.Glyph(fixedDot, r)
if !ok {
b.Fatalf("could not get glyph for %q", r)
}
}
}
func TestFaceKern(t *testing.T) {
// FIXME(sbinet) there is no kerning with gofont/goregular
for _, test := range []struct {
r1, r2 rune
want fixed.Int26_6
}{
{'A', 'A', 0},
{'A', 'V', 0},
{'V', 'A', 0},
{'A', 'v', 0},
{'W', 'a', 0},
{'W', 'i', 0},
{'Y', 'i', 0},
{'f', '(', 0},
{'f', 'f', 0},
{'f', 'i', 0},
{'T', 'a', 0},
{'T', 'e', 0},
} {
got := regular.Kern(test.r1, test.r2)
if got != test.want {
t.Errorf("(%q, %q): glyph kerning=%d. want=%d", test.r1, test.r2, got, test.want)
continue
}
}
}
func TestFaceMetrics(t *testing.T) {
want := font.Metrics{Height: 888, Ascent: 726, Descent: 162, XHeight: 407, CapHeight: 555,
CaretSlope: image.Point{X: 0, Y: 1}}
got := regular.Metrics()
if got != want {
t.Fatalf("metrics failed. got=%#v. want=%#v", got, want)
}
}
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