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Speed up ClassDef/Coverage intersect methods 

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;
}