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fonts_test.go
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package harfbuzz
import (
"reflect"
"testing"
"github.com/benoitkugler/textlayout/fonts"
)
// ported from harfbuzz/test/api/test-font.c Copyright © 2011 Google, Inc. Behdad Esfahbod
var _ fonts.FaceMetrics = dummyFace{}
// implements fonts.FontMetrics with no-ops
type dummyFace struct {
Face
}
func (dummyFace) LoadMetrics() fonts.FaceMetrics { return dummyFace{} }
func (dummyFace) Upem() uint16 { return 1000 }
func (dummyFace) GlyphName(fonts.GID) string { return "" }
func (dummyFace) FontHExtents() (fonts.FontExtents, bool) {
return fonts.FontExtents{}, false
}
func (dummyFace) FontVExtents() (fonts.FontExtents, bool) {
return fonts.FontExtents{}, false
}
func (dummyFace) LineMetric(fonts.LineMetric) (float32, bool) { return 0, false }
func (dummyFace) NominalGlyph(ch rune) (fonts.GID, bool) { return 0, false }
func (dummyFace) VariationGlyph(ch, varSelector rune) (fonts.GID, bool) { return 0, false }
func (dummyFace) HorizontalAdvance(gid fonts.GID) float32 { return 0 }
func (dummyFace) VerticalAdvance(gid fonts.GID) float32 { return 0 }
func (dummyFace) GlyphHOrigin(fonts.GID) (x, y Position, found bool) {
return 0, 0, false
}
func (dummyFace) GlyphVOrigin(fonts.GID) (x, y Position, found bool) {
return 0, 0, false
}
func (dummyFace) GlyphExtents(fonts.GID, uint16, uint16) (fonts.GlyphExtents, bool) {
return fonts.GlyphExtents{}, false
}
func (dummyFace) GetGlyphContourPoint(glyph fonts.GID, pointIndex uint16) (x, y Position, ok bool) {
return 0, 0, false
}
func TestFontProperties(t *testing.T) {
font := NewFont(dummyFace{})
/* Check scale */
upem := int(font.face.Upem())
xScale, yScale := font.XScale, font.YScale
assertEqualInt(t, int(xScale), upem)
assertEqualInt(t, int(yScale), upem)
assertEqualInt(t, int(font.XPpem), 0)
assertEqualInt(t, int(font.YPpem), 0)
assertEqualInt(t, int(font.Ptem), 0)
}
// Unit tests for glyph advance Widths and extents of TrueType variable fonts
// ported from harfbuzz/test/api/test-ot-metrics-tt-var.c Copyright © 2019 Adobe Inc. Michiharu Ariza
func TestExtentsTtVar(t *testing.T) {
face := openFontFile("fonts/SourceSansVariable-Roman-nohvar-41,C1.ttf")
font := NewFont(face)
extents, result := font.GlyphExtents(2)
assert(t, result)
assertEqualInt32(t, extents.XBearing, 10)
assertEqualInt32(t, extents.YBearing, 846)
assertEqualInt32(t, extents.Width, 500)
assertEqualInt32(t, extents.Height, -846)
coords := [1]float32{500.0}
font.SetVarCoordsDesign(coords[:])
extents, result = font.GlyphExtents(2)
assert(t, result)
assertEqualInt32(t, extents.XBearing, 0)
assertEqualInt32(t, extents.YBearing, 874)
assertEqualInt32(t, extents.Width, 550)
assertEqualInt32(t, extents.Height, -874)
}
func TestAdvanceTtVarNohvar(t *testing.T) {
face := openFontFile("fonts/SourceSansVariable-Roman-nohvar-41,C1.ttf")
font := NewFont(face)
x, y := font.GlyphAdvanceForDirection(2, LeftToRight)
assertEqualInt32(t, x, 520)
assertEqualInt32(t, y, 0)
x, y = font.GlyphAdvanceForDirection(2, TopToBottom)
assertEqualInt32(t, x, 0)
assertEqualInt32(t, y, -1000)
coords := []float32{500.0}
font.SetVarCoordsDesign(coords)
x, y = font.GlyphAdvanceForDirection(2, LeftToRight)
assertEqualInt32(t, x, 551)
assertEqualInt32(t, y, 0)
x, y = font.GlyphAdvanceForDirection(2, TopToBottom)
assertEqualInt32(t, x, 0)
// https://lorp.github.io/samsa/src/samsa-gui.html disagree with harfbuzz here
assertEqualInt32(t, y, -995)
}
func TestAdvanceTtVarHvarvvar(t *testing.T) {
face := openFontFile("fonts/SourceSerifVariable-Roman-VVAR.abc.ttf")
font := NewFont(face)
x, y := font.GlyphAdvanceForDirection(1, LeftToRight)
assertEqualInt32(t, x, 508)
assertEqualInt32(t, y, 0)
x, y = font.GlyphAdvanceForDirection(1, TopToBottom)
assertEqualInt32(t, x, 0)
assertEqualInt32(t, y, -1000)
coords := []float32{700.0}
font.SetVarCoordsDesign(coords)
x, y = font.GlyphAdvanceForDirection(1, LeftToRight)
assertEqualInt32(t, x, 531)
assertEqualInt32(t, y, 0)
x, y = font.GlyphAdvanceForDirection(1, TopToBottom)
assertEqualInt32(t, x, 0)
assertEqualInt32(t, y, -1012)
}
func TestAdvanceTtVarAnchor(t *testing.T) {
face := openFontFile("fonts/SourceSansVariable-Roman.anchor.ttf")
font := NewFont(face)
extents, result := font.GlyphExtents(2)
assert(t, result)
assertEqualInt32(t, extents.XBearing, 56)
assertEqualInt32(t, extents.YBearing, 672)
assertEqualInt32(t, extents.Width, 556)
assertEqualInt32(t, extents.Height, -684)
coords := []float32{500.0}
font.SetVarCoordsDesign(coords)
extents, result = font.GlyphExtents(2)
assert(t, result)
assertEqualInt32(t, extents.XBearing, 50)
assertEqualInt32(t, extents.YBearing, 667)
assertEqualInt32(t, extents.Width, 592)
assertEqualInt32(t, extents.Height, -679)
}
func TestExtentsTtVarComp(t *testing.T) {
face := openFontFile("fonts/SourceSansVariable-Roman.modcomp.ttf")
font := NewFont(face)
coords := []float32{800.0}
font.SetVarCoordsDesign(coords)
extents, result := font.GlyphExtents(2) /* Ccedilla, cedilla y-scaled by 0.8, with unscaled component offset */
assert(t, result)
assertEqualInt32(t, extents.XBearing, 19)
assertEqualInt32(t, extents.YBearing, 663)
assertEqualInt32(t, extents.Width, 519)
assertEqualInt32(t, extents.Height, -894)
extents, result = font.GlyphExtents(3) /* Cacute, acute y-scaled by 0.8, with unscaled component offset (default) */
assert(t, result)
assertEqualInt32(t, extents.XBearing, 19)
assertEqualInt32(t, extents.YBearing, 909)
assertEqualInt32(t, extents.Width, 519)
assertEqualInt32(t, extents.Height, -921)
extents, result = font.GlyphExtents(4) /* Ccaron, caron y-scaled by 0.8, with scaled component offset */
assert(t, result)
assertEqualInt32(t, extents.XBearing, 19)
assertEqualInt32(t, extents.YBearing, 866)
assertEqualInt32(t, extents.Width, 519)
assertEqualInt32(t, extents.Height, -878)
}
func TestAdvanceTtVarCompV(t *testing.T) {
face := openFontFile("fonts/SourceSansVariable-Roman.modcomp.ttf")
font := NewFont(face)
coords := []float32{800.0}
font.SetVarCoordsDesign(coords)
x, y := font.GlyphAdvanceForDirection(2, TopToBottom) /* No VVAR; 'C' in composite Ccedilla determines metrics */
assertEqualInt32(t, x, 0)
assertEqualInt32(t, y, -991)
x, y = font.getGlyphOriginForDirection(2, TopToBottom)
assertEqualInt32(t, x, 291)
assertEqualInt32(t, y, 1012)
}
func TestAdvanceTtVarGvarInfer(t *testing.T) {
face := openFontFile("fonts/TestGVAREight.ttf")
coords := []float32{float32(100) / (1 << 14)}
face.SetVarCoordinates(coords)
font := NewFont(face)
_, ok := font.GlyphExtents(4)
assert(t, ok)
}
func TestLoadGraphite(t *testing.T) {
face := openFontFile("fonts/Simple-Graphite-Font.ttf")
font := NewFont(face)
if font.gr == nil {
t.Fatal("missing graphite tables")
}
}
func TestLigCarets(t *testing.T) {
face := openFontFile("fonts/NotoNastaliqUrdu-Regular.ttf")
font := NewFont(face)
font.XScale, font.YScale = int32(face.Upem())*2, int32(face.Upem())*4
/* call with no result */
if L := len(font.GetOTLigatureCarets(LeftToRight, 188)); L != 0 {
t.Fatalf("for glyph %d, expected %d, got %d", 188, 0, L)
}
if L := len(font.GetOTLigatureCarets(LeftToRight, 1021)); L != 0 {
t.Fatalf("for glyph %d, expected %d, got %d", 1021, 0, L)
}
/* a glyph with 3 ligature carets */
carets := font.GetOTLigatureCarets(LeftToRight, 1020)
expected := []Position{2718, 5438, 8156}
if !reflect.DeepEqual(expected, carets) {
t.Fatalf("for glyph %d, expected %v, got %v", 1020, expected, carets)
}
/* a glyph with 1 ligature caret */
carets = font.GetOTLigatureCarets(LeftToRight, 1022)
expected = []Position{3530}
if !reflect.DeepEqual(expected, carets) {
t.Fatalf("for glyph %d, expected %v, got %v", 1022, expected, carets)
}
/* a glyph with 2 ligature carets */
carets = font.GetOTLigatureCarets(LeftToRight, 1023)
expected = []Position{2352, 4706}
if !reflect.DeepEqual(expected, carets) {
t.Fatalf("for glyph %d, expected %v, got %v", 1023, expected, carets)
}
}