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[trak] Don't shift glyphs

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That's what CoreText does and fonts are designed for. Who are we to improve on...
This commit is contained in:
Behdad Esfahbod 2025-02-09 04:18:31 +00:00
parent 1150d4bf12
commit be287eab02
2 changed files with 7 additions and 11 deletions
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4
src/hb-aat-layout-trak-table.hh
View file

@ -206,24 +206,20 @@ struct trak
{
const TrackData &trackData = this+horizData;
float tracking = trackData.get_tracking (this, ptem);
hb_position_t offset_to_add = c->font->em_scalef_x (tracking / 2);
hb_position_t advance_to_add = c->font->em_scalef_x (tracking);
foreach_grapheme (buffer, start, end)
{
buffer->pos[start].x_advance += advance_to_add;
buffer->pos[start].x_offset += offset_to_add;
}
}
else
{
const TrackData &trackData = this+vertData;
float tracking = trackData.get_tracking (this, ptem);
hb_position_t offset_to_add = c->font->em_scalef_y (tracking / 2);
hb_position_t advance_to_add = c->font->em_scalef_y (tracking);
foreach_grapheme (buffer, start, end)
{
buffer->pos[start].y_advance += advance_to_add;
buffer->pos[start].y_offset += offset_to_add;
}
}

14
test/shape/data/in-house/tests/aat-trak.tests
View file

@ -1,8 +1,8 @@
../fonts/TRAK.ttf;;U+0041,U+0042,U+0043;[A.alt=0+1000|B=1+1000|C.alt=2+1000]
../fonts/TRAK.ttf;--font-ptem=.5;U+0041,U+0042,U+0043;[A.alt=0@100,0+1200|B=1@100,0+1200|C.alt=2@100,0+1200]
../fonts/TRAK.ttf;--font-ptem=1;U+0041,U+0042,U+0043;[A.alt=0@100,0+1200|B=1@100,0+1200|C.alt=2@100,0+1200]
../fonts/TRAK.ttf;--font-ptem=2;U+0041,U+0042,U+0043;[A.alt=0@100,0+1200|B=1@100,0+1200|C.alt=2@100,0+1200]
../fonts/TRAK.ttf;--font-ptem=9;U+0041,U+0042,U+0043;[A.alt=0@30,0+1060|B=1@30,0+1060|C.alt=2@30,0+1060]
../fonts/TRAK.ttf;--font-ptem=24;U+0041,U+0042,U+0043;[A.alt=0@-7,0+986|B=1@-7,0+986|C.alt=2@-7,0+986]
../fonts/TRAK.ttf;--font-ptem=72;U+0041,U+0042,U+0043;[A.alt=0@-36,0+929|B=1@-36,0+929|C.alt=2@-36,0+929]
../fonts/TRAK.ttf;--font-ptem=144;U+0041,U+0042,U+0043;[A.alt=0@-50,0+900|B=1@-50,0+900|C.alt=2@-50,0+900]
../fonts/TRAK.ttf;--font-ptem=.5;U+0041,U+0042,U+0043;[A.alt=0+1200|B=1+1200|C.alt=2+1200]
../fonts/TRAK.ttf;--font-ptem=1;U+0041,U+0042,U+0043;[A.alt=0+1200|B=1+1200|C.alt=2+1200]
../fonts/TRAK.ttf;--font-ptem=2;U+0041,U+0042,U+0043;[A.alt=0+1200|B=1+1200|C.alt=2+1200]
../fonts/TRAK.ttf;--font-ptem=9;U+0041,U+0042,U+0043;[A.alt=0+1060|B=1+1060|C.alt=2+1060]
../fonts/TRAK.ttf;--font-ptem=24;U+0041,U+0042,U+0043;[A.alt=0+986|B=1+986|C.alt=2+986]
../fonts/TRAK.ttf;--font-ptem=72;U+0041,U+0042,U+0043;[A.alt=0+929|B=1+929|C.alt=2+929]
../fonts/TRAK.ttf;--font-ptem=144;U+0041,U+0042,U+0043;[A.alt=0+900|B=1+900|C.alt=2+900]