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Speed up ClassDef/Coverage intersect methods

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Just avoiding overhead as measured by Garret.
Should rewrite as dagger in the future and confirm that it has the
same benefits. Later on, rewrite as lfind() maybe.

Fixes https://github.com/harfbuzz/harfbuzz/issues/2826
This commit is contained in:
Behdad Esfahbod 2021-01-21 12:01:13 -07:00
parent 33368a12b7
commit 6463ee02d6
1 changed files with 24 additions and 10 deletions
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34
src/hb-ot-layout-common.hh
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@ -1251,8 +1251,9 @@ struct CoverageFormat1
{
/* TODO Speed up, using hb_set_next() and bsearch()? */
unsigned int count = glyphArray.len;
const HBGlyphID *arr = glyphArray.arrayZ;
for (unsigned int i = 0; i < count; i++)
if (glyphs->has (glyphArray[i]))
if (glyphs->has (arr[i]))
return true;
return false;
}
@ -1356,18 +1357,21 @@ struct CoverageFormat2
bool intersects (const hb_set_t *glyphs) const
{
/* TODO Speed up, using hb_set_next() and bsearch()? */
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
if (rangeRecord[i].intersects (glyphs))
/* TODO Rewrite as dagger. */
unsigned count = rangeRecord.len;
const RangeRecord *arr = rangeRecord.arrayZ;
for (unsigned i = 0; i < count; i++)
if (arr[i].intersects (glyphs))
return true;
return false;
}
bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const
{
unsigned int i;
unsigned int count = rangeRecord.len;
for (i = 0; i < count; i++) {
const RangeRecord &range = rangeRecord[i];
/* TODO Rewrite as dagger. */
unsigned count = rangeRecord.len;
const RangeRecord *arr = rangeRecord.arrayZ;
for (unsigned i = 0; i < count; i++) {
const RangeRecord &range = arr[i];
if (range.value <= index &&
index < (unsigned int) range.value + (range.last - range.first) &&
range.intersects (glyphs))
@ -1815,8 +1819,13 @@ struct ClassDefFormat1
if (hb_set_next (glyphs, &g)) return true;
/* Fall through. */
}
/* TODO Speed up, using set overlap first? */
/* TODO Rewrite as dagger. */
HBUINT16 k; /* TODO(constexpr) use constructor to initialize. */
k = klass;
const HBUINT16 *arr = classValue.arrayZ;
for (unsigned int i = 0; i < count; i++)
if (classValue[i] == klass && glyphs->has (startGlyph + i))
if (arr[i] == k && glyphs->has (startGlyph + i))
return true;
return false;
}
@ -1984,8 +1993,13 @@ struct ClassDefFormat2
return true;
/* Fall through. */
}
/* TODO Speed up, using set overlap first? */
/* TODO Rewrite as dagger. */
HBUINT16 k; /* TODO(constexpr) use constructor to initialize. */
k = klass;
const RangeRecord *arr = rangeRecord.arrayZ;
for (unsigned int i = 0; i < count; i++)
if (rangeRecord[i].value == klass && rangeRecord[i].intersects (glyphs))
if (arr[i].value == k && arr[i].intersects (glyphs))
return true;
return false;
}