freetype/truetype/truetype_test.go

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// Copyright 2012 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 (
"bufio"
"fmt"
"io"
"io/ioutil"
"os"
"strconv"
"strings"
"testing"
"golang.org/x/exp/shiny/font"
"golang.org/x/image/math/fixed"
)
func parseTestdataFont(name string) (f *Font, testdataIsOptional bool, err error) {
b, err := ioutil.ReadFile(fmt.Sprintf("../testdata/%s.ttf", name))
if err != nil {
// The "x-foo" fonts are optional tests, as they are not checked
// in for copyright or file size reasons.
return nil, strings.HasPrefix(name, "x-"), fmt.Errorf("%s: ReadFile: %v", name, err)
}
f, err = Parse(b)
if err != nil {
return nil, true, fmt.Errorf("%s: Parse: %v", name, err)
}
return f, false, nil
}
// TestParse tests that the luxisr.ttf metrics and glyphs are parsed correctly.
// The numerical values can be manually verified by examining luxisr.ttx.
func TestParse(t *testing.T) {
f, _, err := parseTestdataFont("luxisr")
if err != nil {
t.Fatal(err)
}
if got, want := f.FUnitsPerEm(), int32(2048); got != want {
t.Errorf("FUnitsPerEm: got %v, want %v", got, want)
}
fupe := fixed.Int26_6(f.FUnitsPerEm())
if got, want := f.Bounds(fupe), (Bounds{-441, -432, 2024, 2033}); got != want {
t.Errorf("Bounds: got %v, want %v", got, want)
}
i0 := f.Index('A')
i1 := f.Index('V')
if i0 != 36 || i1 != 57 {
t.Fatalf("Index: i0, i1 = %d, %d, want 36, 57", i0, i1)
}
if got, want := f.HMetric(fupe, i0), (HMetric{1366, 19}); got != want {
t.Errorf("HMetric: got %v, want %v", got, want)
}
if got, want := f.VMetric(fupe, i0), (VMetric{2465, 553}); got != want {
t.Errorf("VMetric: got %v, want %v", got, want)
}
if got, want := f.Kerning(fupe, i0, i1), fixed.Int26_6(-144); got != want {
t.Errorf("Kerning: got %v, want %v", got, want)
}
g := NewGlyphBuf()
err = g.Load(f, fupe, i0, font.HintingNone)
if err != nil {
t.Fatalf("Load: %v", err)
}
g0 := &GlyphBuf{
B: g.B,
Point: g.Point,
End: g.End,
}
g1 := &GlyphBuf{
B: Bounds{19, 0, 1342, 1480},
Point: []Point{
{19, 0, 51},
{581, 1480, 1},
{789, 1480, 51},
{1342, 0, 1},
{1116, 0, 35},
{962, 410, 3},
{368, 410, 33},
{214, 0, 3},
{428, 566, 19},
{904, 566, 33},
{667, 1200, 3},
},
End: []int{8, 11},
}
if got, want := fmt.Sprint(g0), fmt.Sprint(g1); got != want {
t.Errorf("GlyphBuf:\ngot %v\nwant %v", got, want)
}
}
func TestIndex(t *testing.T) {
testCases := map[string]map[rune]Index{
"luxisr": {
' ': 3,
'!': 4,
'A': 36,
'V': 57,
'É': 101,
'fl': 193,
'\u22c5': 385,
'中': 0,
},
// The x-etc test cases use those versions of the .ttf files provided
// by Ubuntu 14.04. See testdata/make-other-hinting-txts.sh for details.
"x-arial-bold": {
' ': 3,
'+': 14,
'0': 19,
'_': 66,
'w': 90,
'~': 97,
'Ä': 98,
'fl': 192,
'½': 242,
'σ': 305,
'λ': 540,
'ỹ': 1275,
'\u04e9': 1319,
'中': 0,
},
"x-deja-vu-sans-oblique": {
' ': 3,
'*': 13,
'Œ': 276,
'ω': 861,
'‡': 2571,
'⊕': 3110,
'fl': 4728,
'\ufb03': 4729,
'\ufffd': 4813,
// TODO: '\U0001f640': ???,
'中': 0,
},
"x-droid-sans-japanese": {
' ': 0,
'\u3000': 3,
'\u3041': 25,
'\u30fe': 201,
'\uff61': 202,
'\uff67': 208,
'\uff9e': 263,
'\uff9f': 264,
'\u4e00': 265,
'\u557e': 1000,
'\u61b6': 2024,
'\u6ede': 3177,
'\u7505': 3555,
'\u81e3': 4602,
'\u81e5': 4603,
'\u81e7': 4604,
'\u81e8': 4605,
'\u81ea': 4606,
'\u81ed': 4607,
'\u81f3': 4608,
'\u81f4': 4609,
'\u91c7': 5796,
'\u9fa0': 6620,
'\u203e': 12584,
},
"x-times-new-roman": {
' ': 3,
':': 29,
'fl': 192,
'Ŀ': 273,
'♠': 388,
'Ŗ': 451,
'Σ': 520,
'\u200D': 745,
'Ẽ': 1216,
'\u04e9': 1319,
'中': 0,
},
}
for name, wants := range testCases {
f, testdataIsOptional, err := parseTestdataFont(name)
if err != nil {
if testdataIsOptional {
t.Log(err)
} else {
t.Fatal(err)
}
continue
}
for r, want := range wants {
if got := f.Index(r); got != want {
t.Errorf("%s: Index of %q, aka %U: got %d, want %d", name, r, r, got, want)
}
}
}
}
type scalingTestData struct {
advanceWidth fixed.Int26_6
bounds Bounds
points []Point
}
// scalingTestParse parses a line of points like
// 213 -22 -111 236 555;-22 -111 1, 178 555 1, 236 555 1, 36 -111 1
// The line will not have a trailing "\n".
func scalingTestParse(line string) (ret scalingTestData) {
next := func(s string) (string, fixed.Int26_6) {
t, i := "", strings.Index(s, " ")
if i != -1 {
s, t = s[:i], s[i+1:]
}
x, _ := strconv.Atoi(s)
return t, fixed.Int26_6(x)
}
i := strings.Index(line, ";")
prefix, line := line[:i], line[i+1:]
prefix, ret.advanceWidth = next(prefix)
prefix, ret.bounds.XMin = next(prefix)
prefix, ret.bounds.YMin = next(prefix)
prefix, ret.bounds.XMax = next(prefix)
prefix, ret.bounds.YMax = next(prefix)
ret.points = make([]Point, 0, 1+strings.Count(line, ","))
for len(line) > 0 {
s := line
if i := strings.Index(line, ","); i != -1 {
s, line = line[:i], line[i+1:]
for len(line) > 0 && line[0] == ' ' {
line = line[1:]
}
} else {
line = ""
}
s, x := next(s)
s, y := next(s)
s, f := next(s)
ret.points = append(ret.points, Point{X: x, Y: y, Flags: uint32(f)})
}
return ret
}
// scalingTestEquals is equivalent to, but faster than, calling
// reflect.DeepEquals(a, b), and also returns the index of the first non-equal
// element. It also treats a nil []Point and an empty non-nil []Point as equal.
// a and b must have equal length.
func scalingTestEquals(a, b []Point) (index int, equals bool) {
for i, p := range a {
if p != b[i] {
return i, false
}
}
return 0, true
}
var scalingTestCases = []struct {
name string
size int
}{
{"luxisr", 12},
{"x-arial-bold", 11},
{"x-deja-vu-sans-oblique", 17},
{"x-droid-sans-japanese", 9},
{"x-times-new-roman", 13},
}
func testScaling(t *testing.T, h font.Hinting) {
for _, tc := range scalingTestCases {
f, testdataIsOptional, err := parseTestdataFont(tc.name)
if err != nil {
if testdataIsOptional {
t.Log(err)
} else {
t.Error(err)
}
continue
}
hintingStr := "sans"
if h != font.HintingNone {
hintingStr = "with"
}
testFile, err := os.Open(fmt.Sprintf(
"../testdata/%s-%dpt-%s-hinting.txt", tc.name, tc.size, hintingStr))
if err != nil {
t.Errorf("%s: Open: %v", tc.name, err)
continue
}
defer testFile.Close()
wants := []scalingTestData{}
scanner := bufio.NewScanner(testFile)
if scanner.Scan() {
major, minor, patch := 0, 0, 0
_, err := fmt.Sscanf(scanner.Text(), "freetype version %d.%d.%d", &major, &minor, &patch)
if err != nil {
t.Errorf("%s: version information: %v", tc.name, err)
}
if (major < 2) || (major == 2 && minor < 5) || (major == 2 && minor == 5 && patch < 1) {
t.Errorf("%s: need freetype version >= 2.5.1.\n"+
"Try setting LD_LIBRARY_PATH=/path/to/freetype_built_from_src/objs/.libs/\n"+
"and re-running testdata/make-other-hinting-txts.sh",
tc.name)
continue
}
} else {
t.Errorf("%s: no version information", tc.name)
continue
}
for scanner.Scan() {
wants = append(wants, scalingTestParse(scanner.Text()))
}
if err := scanner.Err(); err != nil && err != io.EOF {
t.Errorf("%s: Scanner: %v", tc.name, err)
continue
}
glyphBuf := NewGlyphBuf()
for i, want := range wants {
if err = glyphBuf.Load(f, fixed.I(tc.size), Index(i), h); err != nil {
t.Errorf("%s: glyph #%d: Load: %v", tc.name, i, err)
continue
}
got := scalingTestData{
advanceWidth: glyphBuf.AdvanceWidth,
bounds: glyphBuf.B,
points: glyphBuf.Point,
}
if got.advanceWidth != want.advanceWidth {
t.Errorf("%s: glyph #%d advance width:\ngot %v\nwant %v",
tc.name, i, got.advanceWidth, want.advanceWidth)
continue
}
if got.bounds != want.bounds {
t.Errorf("%s: glyph #%d bounds:\ngot %v\nwant %v",
tc.name, i, got.bounds, want.bounds)
continue
}
for i := range got.points {
got.points[i].Flags &= 0x01
}
if len(got.points) != len(want.points) {
t.Errorf("%s: glyph #%d:\ngot %v\nwant %v\ndifferent slice lengths: %d versus %d",
tc.name, i, got.points, want.points, len(got.points), len(want.points))
continue
}
if j, equals := scalingTestEquals(got.points, want.points); !equals {
t.Errorf("%s: glyph #%d:\ngot %v\nwant %v\nat index %d: %v versus %v",
tc.name, i, got.points, want.points, j, got.points[j], want.points[j])
continue
}
}
}
}
func TestScalingHintingNone(t *testing.T) { testScaling(t, font.HintingNone) }
func TestScalingHintingFull(t *testing.T) { testScaling(t, font.HintingFull) }