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Templatize hb_set_digest_lowest_bits_t filter

This commit is contained in:
Behdad Esfahbod 2013-04-17 17:45:39 -04:00
parent 0edd0fd255
commit c7851efcd3
1 changed files with 17 additions and 4 deletions
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21
src/hb-set-private.hh
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@ -78,11 +78,21 @@ struct hb_set_digest_common_bits_t
mask_t value;
};
template <typename mask_t, unsigned int shift>
struct hb_set_digest_lowest_bits_t
{
ASSERT_POD ();
typedef unsigned long mask_t;
static const unsigned int num_bits = 0
+ (sizeof (mask_t) >= 1 ? 3 : 0)
+ (sizeof (mask_t) >= 2 ? 1 : 0)
+ (sizeof (mask_t) >= 4 ? 1 : 0)
+ (sizeof (mask_t) >= 8 ? 1 : 0)
+ (sizeof (mask_t) >= 16? 1 : 0)
+ 0;
ASSERT_STATIC (shift < sizeof (hb_codepoint_t) * 8);
ASSERT_STATIC (shift + num_bits <= sizeof (hb_codepoint_t) * 8);
inline void init (void) {
mask = 0;
@ -93,7 +103,7 @@ struct hb_set_digest_lowest_bits_t
}
inline void add_range (hb_codepoint_t a, hb_codepoint_t b) {
if (b - a >= sizeof (mask_t) * 8 - 1)
if ((b >> shift) - (a >> shift) >= sizeof (mask_t) * 8 - 1)
mask = (mask_t) -1;
else {
mask_t ma = mask_for (a);
@ -108,7 +118,10 @@ struct hb_set_digest_lowest_bits_t
private:
static inline mask_t mask_for (hb_codepoint_t g) { return ((mask_t) 1) << (g & (sizeof (mask_t) * 8 - 1)); }
static inline mask_t mask_for (hb_codepoint_t g)
{
return ((mask_t) 1) << ((g >> shift) & (sizeof (mask_t) * 8 - 1));
}
mask_t mask;
};
@ -156,7 +169,7 @@ struct hb_set_digest_combiner_t
typedef hb_set_digest_combiner_t<
hb_set_digest_common_bits_t,
hb_set_digest_lowest_bits_t
hb_set_digest_lowest_bits_t<unsigned long, 0>
>
hb_set_digest_t;