diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-bit-page.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-bit-page.hh | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/hb-bit-page.hh b/thirdparty/harfbuzz/src/hb-bit-page.hh index 263be3d044..9759836654 100644 --- a/thirdparty/harfbuzz/src/hb-bit-page.hh +++ b/thirdparty/harfbuzz/src/hb-bit-page.hh @@ -86,6 +86,72 @@ struct hb_bit_page_t void set_range (hb_codepoint_t a, hb_codepoint_t b, bool v) { if (v) add_range (a, b); else del_range (a, b); } + + // Writes out page values to the array p. Returns the number of values + // written. At most size codepoints will be written. + unsigned int write (uint32_t base, + unsigned int start_value, + hb_codepoint_t *p, + unsigned int size) const + { + unsigned int start_v = start_value >> ELT_BITS_LOG_2; + unsigned int start_bit = start_value & ELT_MASK; + unsigned int count = 0; + for (unsigned i = start_v; i < len () && count < size; i++) + { + elt_t bits = v[i]; + uint32_t v_base = base | (i << ELT_BITS_LOG_2); + for (unsigned int j = start_bit; j < ELT_BITS && count < size; j++) + { + if ((elt_t(1) << j) & bits) { + *p++ = v_base | j; + count++; + } + } + start_bit = 0; + } + return count; + } + + // Writes out the values NOT in this page to the array p. Returns the + // number of values written. At most size codepoints will be written. + // Returns the number of codepoints written. next_value holds the next value + // that should be written (if not present in this page). This is used to fill + // any missing value gaps between this page and the previous page, if any. + // next_value is updated to one more than the last value present in this page. + unsigned int write_inverted (uint32_t base, + unsigned int start_value, + hb_codepoint_t *p, + unsigned int size, + hb_codepoint_t *next_value) const + { + unsigned int start_v = start_value >> ELT_BITS_LOG_2; + unsigned int start_bit = start_value & ELT_MASK; + unsigned int count = 0; + for (unsigned i = start_v; i < len () && count < size; i++) + { + elt_t bits = v[i]; + uint32_t v_offset = i << ELT_BITS_LOG_2; + for (unsigned int j = start_bit; j < ELT_BITS && count < size; j++) + { + if ((elt_t(1) << j) & bits) + { + hb_codepoint_t value = base | v_offset | j; + // Emit all the missing values from next_value up to value - 1. + for (hb_codepoint_t k = *next_value; k < value && count < size; k++) + { + *p++ = k; + count++; + } + // Skip over this value; + *next_value = value + 1; + } + } + start_bit = 0; + } + return count; + } + bool is_equal (const hb_bit_page_t &other) const { return 0 == hb_memcmp (&v, &other.v, sizeof (v)); @@ -179,6 +245,9 @@ struct hb_bit_page_t typedef unsigned long long elt_t; static constexpr unsigned PAGE_BITS = 512; static_assert ((PAGE_BITS & ((PAGE_BITS) - 1)) == 0, ""); + static constexpr unsigned PAGE_BITS_LOG_2 = 9; + static_assert (1 << PAGE_BITS_LOG_2 == PAGE_BITS, ""); + static constexpr unsigned PAGE_BITMASK = PAGE_BITS - 1; static unsigned int elt_get_min (const elt_t &elt) { return hb_ctz (elt); } static unsigned int elt_get_max (const elt_t &elt) { return hb_bit_storage (elt) - 1; } @@ -186,7 +255,10 @@ struct hb_bit_page_t typedef hb_vector_size_t<elt_t, PAGE_BITS / 8> vector_t; static constexpr unsigned ELT_BITS = sizeof (elt_t) * 8; + static constexpr unsigned ELT_BITS_LOG_2 = 6; + static_assert (1 << ELT_BITS_LOG_2 == ELT_BITS, ""); static constexpr unsigned ELT_MASK = ELT_BITS - 1; + static constexpr unsigned BITS = sizeof (vector_t) * 8; static constexpr unsigned MASK = BITS - 1; static_assert ((unsigned) PAGE_BITS == (unsigned) BITS, ""); |