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text: use upstream bidi visual order algorithm

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We've migrated the processing of bidi run ordering into the upstream typesetting
package, so now we can just consume the already-ordered runs instead of computing
their ordering ourselves.

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
This commit is contained in:
Chris Waldon
2024-12-17 09:26:29 -05:00
parent 0cbbacc45a
commit 26cddb00b1
2 changed files with 14 additions and 178 deletions
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text/gotext_test.go
-115
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@@ -3,7 +3,6 @@ package text
import (
"fmt"
"math"
"reflect"
"strconv"
"testing"
@@ -450,120 +449,6 @@ func TestToLine(t *testing.T) {
}
}
func TestComputeVisualOrder(t *testing.T) {
type testcase struct {
name string
input line
expectedVisualOrder []int
}
for _, tc := range []testcase{
{
name: "ltr",
input: line{
direction: system.LTR,
runs: []runLayout{
{Direction: system.LTR},
{Direction: system.LTR},
{Direction: system.LTR},
},
},
expectedVisualOrder: []int{0, 1, 2},
},
{
name: "rtl",
input: line{
direction: system.RTL,
runs: []runLayout{
{Direction: system.RTL},
{Direction: system.RTL},
{Direction: system.RTL},
},
},
expectedVisualOrder: []int{2, 1, 0},
},
{
name: "bidi-ltr",
input: line{
direction: system.LTR,
runs: []runLayout{
{Direction: system.LTR},
{Direction: system.RTL},
{Direction: system.RTL},
{Direction: system.RTL},
{Direction: system.LTR},
},
},
expectedVisualOrder: []int{0, 3, 2, 1, 4},
},
{
name: "bidi-ltr-complex",
input: line{
direction: system.LTR,
runs: []runLayout{
{Direction: system.RTL},
{Direction: system.RTL},
{Direction: system.LTR},
{Direction: system.RTL},
{Direction: system.RTL},
{Direction: system.LTR},
{Direction: system.RTL},
{Direction: system.RTL},
{Direction: system.LTR},
{Direction: system.RTL},
{Direction: system.RTL},
},
},
expectedVisualOrder: []int{1, 0, 2, 4, 3, 5, 7, 6, 8, 10, 9},
},
{
name: "bidi-rtl",
input: line{
direction: system.RTL,
runs: []runLayout{
{Direction: system.RTL},
{Direction: system.LTR},
{Direction: system.LTR},
{Direction: system.LTR},
{Direction: system.RTL},
},
},
expectedVisualOrder: []int{4, 1, 2, 3, 0},
},
{
name: "bidi-rtl-complex",
input: line{
direction: system.RTL,
runs: []runLayout{
{Direction: system.LTR},
{Direction: system.LTR},
{Direction: system.RTL},
{Direction: system.LTR},
{Direction: system.LTR},
{Direction: system.RTL},
{Direction: system.LTR},
{Direction: system.LTR},
{Direction: system.RTL},
{Direction: system.LTR},
{Direction: system.LTR},
},
},
expectedVisualOrder: []int{9, 10, 8, 6, 7, 5, 3, 4, 2, 0, 1},
},
} {
t.Run(tc.name, func(t *testing.T) {
computeVisualOrder(&tc.input)
if !reflect.DeepEqual(tc.input.visualOrder, tc.expectedVisualOrder) {
t.Errorf("expected visual order %v, got %v", tc.expectedVisualOrder, tc.input.visualOrder)
}
for i, visualIndex := range tc.input.visualOrder {
if pos := tc.input.runs[visualIndex].VisualPosition; pos != i {
t.Errorf("line.VisualOrder[%d]=%d, but line.Runs[%d].VisualPosition=%d", i, visualIndex, visualIndex, pos)
}
}
})
}
}
func FuzzLayout(f *testing.F) {
ltrFace, _ := opentype.Parse(goregular.TTF)
rtlFace, _ := opentype.Parse(nsareg.TTF)