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[set] Fix algebra 

Was totally b0rked. Ouch!

Fixes https://github.com/harfbuzz/harfbuzz/issues/863
This commit is contained in:
Behdad Esfahbod 2018-03-07 10:49:26 +01:00
parent 7587683cdc
commit f014a124f5
1 changed files with 17 additions and 3 deletions
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20
src/hb-set-private.hh
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@ -389,6 +389,7 @@ struct hb_set_t
unsigned int na = pages.len;
unsigned int nb = other->pages.len;
unsigned int next_page = na;
unsigned int count = 0;
unsigned int a = 0, b = 0;
@ -431,6 +432,7 @@ struct hb_set_t
a--;
b--;
count--;
page_map[count] = page_map[a];
Op::process (page_at (count).v, page_at (a).v, other->page_at (b).v);
}
else if (page_map[a - 1].major > other->page_map[b - 1].major)
@ -439,7 +441,7 @@ struct hb_set_t
if (Op::passthru_left)
{
count--;
page_at (count).v = page_at (a).v;
page_map[count] = page_map[a];
}
}
else
@ -448,16 +450,28 @@ struct hb_set_t
if (Op::passthru_right)
{
count--;
page_map[count].major = other->page_map[b].major;
page_map[count].index = next_page++;
page_at (count).v = other->page_at (b).v;
}
}
}
if (Op::passthru_left)
while (a)
page_at (--count).v = page_at (--a).v;
{
a--;
count--;
page_map[count] = page_map [a];
}
if (Op::passthru_right)
while (b)
page_at (--count).v = other->page_at (--b).v;
{
b--;
count--;
page_map[count].major = other->page_map[b].major;
page_map[count].index = next_page++;
page_at (count).v = other->page_at (b).v;
}
assert (!count);
}