3ba1c0f728
The slice Foos is plural; it refers to multiple elements. The element Foos[i] is the i'th Foo.
377 lines
9.3 KiB
Go
377 lines
9.3 KiB
Go
// Copyright 2012 The Freetype-Go Authors. All rights reserved.
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// Use of this source code is governed by your choice of either the
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// FreeType License or the GNU General Public License version 2 (or
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// any later version), both of which can be found in the LICENSE file.
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package truetype
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"testing"
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"golang.org/x/exp/shiny/font"
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"golang.org/x/image/math/fixed"
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)
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func parseTestdataFont(name string) (f *Font, testdataIsOptional bool, err error) {
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b, err := ioutil.ReadFile(fmt.Sprintf("../testdata/%s.ttf", name))
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if err != nil {
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// The "x-foo" fonts are optional tests, as they are not checked
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// in for copyright or file size reasons.
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return nil, strings.HasPrefix(name, "x-"), fmt.Errorf("%s: ReadFile: %v", name, err)
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}
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f, err = Parse(b)
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if err != nil {
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return nil, true, fmt.Errorf("%s: Parse: %v", name, err)
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}
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return f, false, nil
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}
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func mkBounds(minX, minY, maxX, maxY fixed.Int26_6) fixed.Rectangle26_6 {
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return fixed.Rectangle26_6{
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Min: fixed.Point26_6{
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X: minX,
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Y: minY,
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},
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Max: fixed.Point26_6{
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X: maxX,
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Y: maxY,
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},
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}
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}
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// TestParse tests that the luxisr.ttf metrics and glyphs are parsed correctly.
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// The numerical values can be manually verified by examining luxisr.ttx.
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func TestParse(t *testing.T) {
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f, _, err := parseTestdataFont("luxisr")
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if err != nil {
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t.Fatal(err)
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}
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if got, want := f.FUnitsPerEm(), int32(2048); got != want {
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t.Errorf("FUnitsPerEm: got %v, want %v", got, want)
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}
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fupe := fixed.Int26_6(f.FUnitsPerEm())
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if got, want := f.Bounds(fupe), mkBounds(-441, -432, 2024, 2033); got != want {
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t.Errorf("Bounds: got %v, want %v", got, want)
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}
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i0 := f.Index('A')
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i1 := f.Index('V')
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if i0 != 36 || i1 != 57 {
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t.Fatalf("Index: i0, i1 = %d, %d, want 36, 57", i0, i1)
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}
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if got, want := f.HMetric(fupe, i0), (HMetric{1366, 19}); got != want {
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t.Errorf("HMetric: got %v, want %v", got, want)
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}
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if got, want := f.VMetric(fupe, i0), (VMetric{2465, 553}); got != want {
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t.Errorf("VMetric: got %v, want %v", got, want)
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}
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if got, want := f.Kern(fupe, i0, i1), fixed.Int26_6(-144); got != want {
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t.Errorf("Kern: got %v, want %v", got, want)
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}
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g := &GlyphBuf{}
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err = g.Load(f, fupe, i0, font.HintingNone)
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if err != nil {
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t.Fatalf("Load: %v", err)
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}
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g0 := &GlyphBuf{
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Bounds: g.Bounds,
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Points: g.Points,
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Ends: g.Ends,
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}
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g1 := &GlyphBuf{
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Bounds: mkBounds(19, 0, 1342, 1480),
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Points: []Point{
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{19, 0, 51},
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{581, 1480, 1},
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{789, 1480, 51},
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{1342, 0, 1},
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{1116, 0, 35},
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{962, 410, 3},
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{368, 410, 33},
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{214, 0, 3},
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{428, 566, 19},
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{904, 566, 33},
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{667, 1200, 3},
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},
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Ends: []int{8, 11},
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}
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if got, want := fmt.Sprint(g0), fmt.Sprint(g1); got != want {
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t.Errorf("GlyphBuf:\ngot %v\nwant %v", got, want)
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}
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}
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func TestIndex(t *testing.T) {
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testCases := map[string]map[rune]Index{
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"luxisr": {
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' ': 3,
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'!': 4,
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'A': 36,
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'V': 57,
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'É': 101,
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'fl': 193,
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'\u22c5': 385,
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'中': 0,
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},
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// The x-etc test cases use those versions of the .ttf files provided
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// by Ubuntu 14.04. See testdata/make-other-hinting-txts.sh for details.
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"x-arial-bold": {
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' ': 3,
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'+': 14,
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'0': 19,
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'_': 66,
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'w': 90,
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'~': 97,
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'Ä': 98,
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'fl': 192,
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'½': 242,
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'σ': 305,
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'λ': 540,
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'ỹ': 1275,
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'\u04e9': 1319,
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'中': 0,
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},
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"x-deja-vu-sans-oblique": {
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' ': 3,
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'*': 13,
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'Œ': 276,
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'ω': 861,
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'‡': 2571,
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'⊕': 3110,
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'fl': 4728,
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'\ufb03': 4729,
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'\ufffd': 4813,
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// TODO: '\U0001f640': ???,
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'中': 0,
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},
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"x-droid-sans-japanese": {
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' ': 0,
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'\u3000': 3,
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'\u3041': 25,
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'\u30fe': 201,
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'\uff61': 202,
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'\uff67': 208,
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'\uff9e': 263,
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'\uff9f': 264,
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'\u4e00': 265,
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'\u557e': 1000,
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'\u61b6': 2024,
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'\u6ede': 3177,
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'\u7505': 3555,
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'\u81e3': 4602,
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'\u81e5': 4603,
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'\u81e7': 4604,
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'\u81e8': 4605,
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'\u81ea': 4606,
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'\u81ed': 4607,
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'\u81f3': 4608,
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'\u81f4': 4609,
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'\u91c7': 5796,
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'\u9fa0': 6620,
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'\u203e': 12584,
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},
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"x-times-new-roman": {
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' ': 3,
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':': 29,
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'fl': 192,
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'Ŀ': 273,
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'♠': 388,
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'Ŗ': 451,
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'Σ': 520,
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'\u200D': 745,
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'Ẽ': 1216,
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'\u04e9': 1319,
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'中': 0,
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},
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}
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for name, wants := range testCases {
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f, testdataIsOptional, err := parseTestdataFont(name)
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if err != nil {
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if testdataIsOptional {
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t.Log(err)
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} else {
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t.Fatal(err)
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}
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continue
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}
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for r, want := range wants {
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if got := f.Index(r); got != want {
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t.Errorf("%s: Index of %q, aka %U: got %d, want %d", name, r, r, got, want)
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}
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}
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}
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}
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type scalingTestData struct {
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advanceWidth fixed.Int26_6
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bounds fixed.Rectangle26_6
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points []Point
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}
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// scalingTestParse parses a line of points like
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// 213 -22 -111 236 555;-22 -111 1, 178 555 1, 236 555 1, 36 -111 1
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// The line will not have a trailing "\n".
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func scalingTestParse(line string) (ret scalingTestData) {
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next := func(s string) (string, fixed.Int26_6) {
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t, i := "", strings.Index(s, " ")
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if i != -1 {
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s, t = s[:i], s[i+1:]
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}
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x, _ := strconv.Atoi(s)
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return t, fixed.Int26_6(x)
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}
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i := strings.Index(line, ";")
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prefix, line := line[:i], line[i+1:]
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prefix, ret.advanceWidth = next(prefix)
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prefix, ret.bounds.Min.X = next(prefix)
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prefix, ret.bounds.Min.Y = next(prefix)
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prefix, ret.bounds.Max.X = next(prefix)
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prefix, ret.bounds.Max.Y = next(prefix)
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ret.points = make([]Point, 0, 1+strings.Count(line, ","))
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for len(line) > 0 {
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s := line
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if i := strings.Index(line, ","); i != -1 {
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s, line = line[:i], line[i+1:]
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for len(line) > 0 && line[0] == ' ' {
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line = line[1:]
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}
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} else {
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line = ""
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}
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s, x := next(s)
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s, y := next(s)
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s, f := next(s)
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ret.points = append(ret.points, Point{X: x, Y: y, Flags: uint32(f)})
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}
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return ret
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}
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// scalingTestEquals is equivalent to, but faster than, calling
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// reflect.DeepEquals(a, b), and also returns the index of the first non-equal
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// element. It also treats a nil []Point and an empty non-nil []Point as equal.
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// a and b must have equal length.
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func scalingTestEquals(a, b []Point) (index int, equals bool) {
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for i, p := range a {
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if p != b[i] {
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return i, false
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}
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}
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return 0, true
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}
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var scalingTestCases = []struct {
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name string
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size int
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}{
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{"luxisr", 12},
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{"x-arial-bold", 11},
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{"x-deja-vu-sans-oblique", 17},
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{"x-droid-sans-japanese", 9},
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{"x-times-new-roman", 13},
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}
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func testScaling(t *testing.T, h font.Hinting) {
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for _, tc := range scalingTestCases {
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f, testdataIsOptional, err := parseTestdataFont(tc.name)
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if err != nil {
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if testdataIsOptional {
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t.Log(err)
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} else {
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t.Error(err)
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}
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continue
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}
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hintingStr := "sans"
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if h != font.HintingNone {
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hintingStr = "with"
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}
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testFile, err := os.Open(fmt.Sprintf(
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"../testdata/%s-%dpt-%s-hinting.txt", tc.name, tc.size, hintingStr))
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if err != nil {
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t.Errorf("%s: Open: %v", tc.name, err)
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continue
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}
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defer testFile.Close()
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wants := []scalingTestData{}
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scanner := bufio.NewScanner(testFile)
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if scanner.Scan() {
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major, minor, patch := 0, 0, 0
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_, err := fmt.Sscanf(scanner.Text(), "freetype version %d.%d.%d", &major, &minor, &patch)
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if err != nil {
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t.Errorf("%s: version information: %v", tc.name, err)
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}
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if (major < 2) || (major == 2 && minor < 5) || (major == 2 && minor == 5 && patch < 1) {
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t.Errorf("%s: need freetype version >= 2.5.1.\n"+
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"Try setting LD_LIBRARY_PATH=/path/to/freetype_built_from_src/objs/.libs/\n"+
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"and re-running testdata/make-other-hinting-txts.sh",
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tc.name)
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continue
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}
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} else {
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t.Errorf("%s: no version information", tc.name)
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continue
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}
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for scanner.Scan() {
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wants = append(wants, scalingTestParse(scanner.Text()))
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}
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if err := scanner.Err(); err != nil && err != io.EOF {
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t.Errorf("%s: Scanner: %v", tc.name, err)
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continue
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}
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glyphBuf := &GlyphBuf{}
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for i, want := range wants {
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if err = glyphBuf.Load(f, fixed.I(tc.size), Index(i), h); err != nil {
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t.Errorf("%s: glyph #%d: Load: %v", tc.name, i, err)
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continue
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}
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got := scalingTestData{
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advanceWidth: glyphBuf.AdvanceWidth,
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bounds: glyphBuf.Bounds,
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points: glyphBuf.Points,
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}
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if got.advanceWidth != want.advanceWidth {
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t.Errorf("%s: glyph #%d advance width:\ngot %v\nwant %v",
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tc.name, i, got.advanceWidth, want.advanceWidth)
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continue
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}
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if got.bounds != want.bounds {
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t.Errorf("%s: glyph #%d bounds:\ngot %v\nwant %v",
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tc.name, i, got.bounds, want.bounds)
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continue
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}
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for i := range got.points {
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got.points[i].Flags &= 0x01
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}
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if len(got.points) != len(want.points) {
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t.Errorf("%s: glyph #%d:\ngot %v\nwant %v\ndifferent slice lengths: %d versus %d",
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tc.name, i, got.points, want.points, len(got.points), len(want.points))
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continue
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}
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if j, equals := scalingTestEquals(got.points, want.points); !equals {
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t.Errorf("%s: glyph #%d:\ngot %v\nwant %v\nat index %d: %v versus %v",
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tc.name, i, got.points, want.points, j, got.points[j], want.points[j])
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continue
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}
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}
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}
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}
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func TestScalingHintingNone(t *testing.T) { testScaling(t, font.HintingNone) }
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func TestScalingHintingFull(t *testing.T) { testScaling(t, font.HintingFull) }
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