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dwrite: Use BitScanReverse instead of dwrite_log2i. 

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jacek Caban 2020-06-10 14:21:50 +02:00 committed by Alexandre Julliard
parent f5e67202cc
commit ce4083eccc
1 changed files with 1 additions and 31 deletions
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32
dlls/dwrite/opentype.c
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@ -3518,36 +3518,6 @@ static inline unsigned int dwrite_popcount(unsigned int x)
#endif
}
static inline unsigned int dwrite_log2i(unsigned int x)
{
#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
return __builtin_clz(x) ^ 0x1f;
#else
static const unsigned int l[] =
{
~0u, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
};
unsigned int i;
return (i = x >> 16) ? (x = i >> 8) ? l[x] + 24 : l[i] + 16 : (i = x >> 8) ? l[i] + 8 : l[x];
#endif
}
static float opentype_scale_gpos_be_value(WORD value, float emsize, UINT16 upem)
{
return (short)GET_BE_WORD(value) * emsize / upem;
@ -4650,7 +4620,7 @@ static void opentype_layout_collect_lookups(struct scriptshaping_context *contex
if ((feature->flags & FEATURE_GLOBAL) && feature->max_value == 1)
bits_needed = 0;
else
bits_needed = min(8, dwrite_log2i(feature->max_value));
BitScanReverse(&bits_needed, min(feature->max_value, 256));
if (!feature->max_value || next_bit + bits_needed > 8 * sizeof (feature->mask))
continue;