empty_glyph_test.go RawHistoryFolder

1package render
2
3import (
4	"testing"
5
6	"github.com/bnema/nefergui/internal/layout"
7	"github.com/bnema/nefergui/internal/text"
8	"github.com/go-text/typesetting/font"
9)
10
11func TestUncoveredSpaceRemainsInvisible(t *testing.T) {
12	catalog, err := text.Load(text.DirectorySource("../../testdata/fonts"))
13	if err != nil {
14		t.Fatal(err)
15	}
16	measured, err := text.NewEngine(catalog).Measure("a\u1680b", text.Request{Families: []string{"Noto Sans"}, Size: 20}, 0)
17	if err != nil {
18		t.Fatal(err)
19	}
20	cmd := layout.Command{Op: "text", Opacity: 1}
21	spaces := 0
22	for _, line := range measured.Lines {
23		for _, shaped := range line.Runs {
24			r := layout.Run{Face: shaped.Face, FaceID: shaped.Face.ID, Size: 20}
25			for _, g := range shaped.Glyphs {
26				if g.ID == font.EmptyGlyph {
27					spaces++
28					if g.Missing || g.Advance <= 0 {
29						t.Fatalf("empty space glyph: %+v", g)
30					}
31				}
32				r.Glyphs = append(r.Glyphs, layout.Glyph{ID: uint32(g.ID), X: 6 + g.X, Y: 30 + g.Y})
33			}
34			cmd.Runs = append(cmd.Runs, r)
35		}
36	}
37	if spaces != 1 {
38		t.Fatalf("want one uncovered space, got %d", spaces)
39	}
40	p, err := NewPreparer(256, 2)
41	if err != nil {
42		t.Fatal(err)
43	}
44	frame, err := p.Prepare([]layout.Command{cmd}, 1, 200, 100)
45	if err != nil || len(frame.Quads) != 2 {
46		t.Fatalf("space must emit no quad: %d quads, error %v", len(frame.Quads), err)
47	}
48}