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[instancer-solver] port solver fix from fonttools

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See https://github.com/fonttools/fonttools/issues/3139
This commit is contained in:
Qunxin Liu 2023-05-30 09:26:58 -07:00 • committed by Behdad Esfahbod
parent f3b4d35f36
commit 4acf6a82bf
2 changed files with 19 additions and 1 deletions
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2
src/hb-subset-instancer-solver.cc
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@ -173,7 +173,7 @@ _solve (Triple tent, Triple axisLimit, bool negative = false)
// Crossing point on the axis.
float crossing = peak + ((1 - gain) * (upper - peak) / (1 - outGain));
Triple loc{peak, peak, crossing};
Triple loc{axisDef, peak, crossing};
float scalar = 1.f;
// The part before the crossing point.

18
src/test-subset-instancer-solver.cc
View file

@ -331,6 +331,24 @@ main (int argc, char **argv)
assert (out[0].second == Triple (0.f, 0.4f, 32767/(float) (1 << 14)));
}
{
Triple tent (0.f, 0.5f, 1.f);
Triple axis_range (-1.f, 0.25f, 1.f);
result_t out = rebase_tent (tent, axis_range);
assert (out.length == 5);
assert (out[0].first == 0.5f);
assert (out[0].second == Triple ());
assert (out[1].first == 0.5f);
assert (out[1].second == Triple (0.f, 1.f/3, 2.f/3));
assert (out[2].first == -0.5f);
assert (out[2].second == Triple (2.f/3, 1.f, 1.f));
assert (out[3].first == -0.5f);
assert (out[3].second == Triple (-1.f, -0.2f, 0.f));
assert (out[4].first == -0.5f);
assert (out[4].second == Triple (-1.f, -1.f, -0.2f));
}
{
Triple tent (0.5f, 0.5f, 0.5f);
Triple axis_range (0.f, 0.5f, 1.f);