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/*
* Copyright © 2012,2017 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_SET_PRIVATE_HH
#define HB_SET_PRIVATE_HH
#include "hb-private.hh"
#include "hb-object-private.hh"
/*
* hb_set_t
*/
/* TODO Keep a free-list so we can free pages that are completely zeroed. At that
* point maybe also use a sentinel value for "all-1" pages? */
struct hb_set_t
{
struct page_map_t
{
inline int cmp (const page_map_t *o) const { return (int) o->major - (int) major; }
uint32_t major;
uint32_t index;
};
struct page_t
{
inline void init0 (void) { memset (&v, 0, sizeof (v)); }
inline void init1 (void) { memset (&v, 0xff, sizeof (v)); }
inline unsigned int len (void) const
{ return ARRAY_LENGTH_CONST (v); }
inline bool is_empty (void) const
{
for (unsigned int i = 0; i < len (); i++)
if (v[i])
return false;
return true;
}
inline void add (hb_codepoint_t g) { elt (g) |= mask (g); }
inline void del (hb_codepoint_t g) { elt (g) &= ~mask (g); }
inline bool has (hb_codepoint_t g) const { return !!(elt (g) & mask (g)); }
inline void add_range (hb_codepoint_t a, hb_codepoint_t b)
{
elt_t *la = &elt (a);
elt_t *lb = &elt (b);
if (la == lb)
*la |= (mask (b) << 1) - mask(a);
else
{
*la |= ~(mask (a) - 1);
la++;
memset (la, 0xff, (char *) lb - (char *) la);
*lb |= ((mask (b) << 1) - 1);
}
}
inline bool is_equal (const page_t *other) const
{
return 0 == memcmp (&v, &other->v, sizeof (v));
}
inline unsigned int get_population (void) const
{
unsigned int pop = 0;
for (unsigned int i = 0; i < len (); i++)
pop += _hb_popcount (v[i]);
return pop;
}
inline bool next (hb_codepoint_t *codepoint) const
{
unsigned int m = (*codepoint + 1) & MASK;
if (!m)
{
*codepoint = INVALID;
return false;
}
unsigned int i = m / ELT_BITS;
unsigned int j = m & ELT_MASK;
for (; j < ELT_BITS; j++)
if (v[i] & (elt_t (1) << j))
goto found;
for (i++; i < len (); i++)
if (v[i])
for (j = 0; j < ELT_BITS; j++)
if (v[i] & (elt_t (1) << j))
goto found;
*codepoint = INVALID;
return false;
found:
*codepoint = i * ELT_BITS + j;
return true;
}
inline hb_codepoint_t get_min (void) const
{
for (unsigned int i = 0; i < len (); i++)
if (v[i])
{
elt_t e = v[i];
for (unsigned int j = 0; j < ELT_BITS; j++)
if (e & (elt_t (1) << j))
return i * ELT_BITS + j;
}
return INVALID;
}
inline hb_codepoint_t get_max (void) const
{
for (int i = len () - 1; i >= 0; i--)
if (v[i])
{
elt_t e = v[i];
for (int j = ELT_BITS - 1; j >= 0; j--)
if (e & (elt_t (1) << j))
return i * ELT_BITS + j;
}
return 0;
}
static const unsigned int PAGE_BITS = 8192; /* Use to tune. */
static_assert ((PAGE_BITS & ((PAGE_BITS) - 1)) == 0, "");
typedef uint64_t elt_t;
#if 0 && HAVE_VECTOR_SIZE
/* The vectorized version does not work with clang as non-const
* elt() errs "non-const reference cannot bind to vector element". */
typedef elt_t vector_t __attribute__((vector_size (PAGE_BITS / 8)));
#else
typedef hb_vector_size_t<elt_t, PAGE_BITS / 8> vector_t;
#endif
vector_t v;
static const unsigned int ELT_BITS = sizeof (elt_t) * 8;
static const unsigned int ELT_MASK = ELT_BITS - 1;
static const unsigned int BITS = sizeof (vector_t) * 8;
static const unsigned int MASK = BITS - 1;
static_assert (PAGE_BITS == BITS, "");
elt_t &elt (hb_codepoint_t g) { return v[(g & MASK) / ELT_BITS]; }
elt_t const &elt (hb_codepoint_t g) const { return v[(g & MASK) / ELT_BITS]; }
elt_t mask (hb_codepoint_t g) const { return elt_t (1) << (g & ELT_MASK); }
};
static_assert (page_t::PAGE_BITS == sizeof (page_t) * 8, "");
hb_object_header_t header;
ASSERT_POD ();
bool in_error;
hb_prealloced_array_t<page_map_t, 8> page_map;
hb_prealloced_array_t<page_t, 1> pages;
inline void init (void)
{
page_map.init ();
pages.init ();
}
inline void finish (void)
{
page_map.finish ();
pages.finish ();
}
inline bool resize (unsigned int count)
{
if (unlikely (in_error)) return false;
if (!pages.resize (count) || !page_map.resize (count))
{
pages.resize (page_map.len);
in_error = true;
return false;
}
return true;
}
inline void clear (void) {
if (unlikely (hb_object_is_inert (this)))
return;
in_error = false;
page_map.resize (0);
pages.resize (0);
}
inline bool is_empty (void) const {
unsigned int count = pages.len;
for (unsigned int i = 0; i < count; i++)
if (!pages[i].is_empty ())
return false;
return true;
}
inline void add (hb_codepoint_t g)
{
if (unlikely (in_error)) return;
if (unlikely (g == INVALID)) return;
page_t *page = page_for_insert (g);
if (unlikely (!page)) return;
page->add (g);
}
inline void add_range (hb_codepoint_t a, hb_codepoint_t b)
{
if (unlikely (in_error || a > b || a == INVALID || b == INVALID)) return;
unsigned int ma = get_major (a);
unsigned int mb = get_major (b);
if (ma == mb)
{
page_t *page = page_for_insert (a);
if (unlikely (!page)) return;
page->add_range (a, b);
}
else
{
page_t *page = page_for_insert (a);
if (unlikely (!page)) return;
page->add_range (a, major_start (ma + 1) - 1);
for (unsigned int m = ma + 1; m < mb; m++)
{
page = page_for_insert (major_start (m));
if (unlikely (!page)) return;
page->init1 ();
}
page = page_for_insert (b);
if (unlikely (!page)) return;
page->add_range (major_start (mb), b);
}
}
template <typename T>
inline void add_array (const T *array, unsigned int count)
{
for (unsigned int i = 0; i < count; i++)
add (array[i]);
}
inline void del (hb_codepoint_t g)
{
if (unlikely (in_error)) return;
page_t *p = page_for (g);
if (!p)
return;
p->del (g);
}
inline void del_range (hb_codepoint_t a, hb_codepoint_t b)
{
/* TODO Optimize, like add_range(). */
if (unlikely (in_error)) return;
for (unsigned int i = a; i < b + 1; i++)
del (i);
}
inline bool has (hb_codepoint_t g) const
{
const page_t *p = page_for (g);
if (!p)
return false;
return p->has (g);
}
inline bool intersects (hb_codepoint_t first,
hb_codepoint_t last) const
{
hb_codepoint_t c = first - 1;
return next (&c) && c <= last;
}
inline void set (const hb_set_t *other)
{
if (unlikely (in_error)) return;
unsigned int count = other->pages.len;
if (!resize (count))
return;
memcpy (pages.array, other->pages.array, count * sizeof (pages.array[0]));
memcpy (page_map.array, other->page_map.array, count * sizeof (page_map.array[0]));
}
inline bool is_equal (const hb_set_t *other) const
{
unsigned int na = pages.len;
unsigned int nb = other->pages.len;
unsigned int a = 0, b = 0;
for (; a < na && b < nb; )
{
if (page_at (a).is_empty ()) { a++; continue; }
if (other->page_at (b).is_empty ()) { b++; continue; }
if (page_map[a].major != other->page_map[b].major ||
!page_at (a).is_equal (&other->page_at (b)))
return false;
a++;
b++;
}
for (; a < na; a++)
if (!page_at (a).is_empty ()) { return false; }
for (; b < nb; b++)
if (!other->page_at (b).is_empty ()) { return false; }
return true;
}
template <class Op>
inline void process (const hb_set_t *other)
{
if (unlikely (in_error)) return;
unsigned int na = pages.len;
unsigned int nb = other->pages.len;
unsigned int count = 0;
unsigned int a = 0, b = 0;
for (; a < na && b < nb; )
{
if (page_map[a].major == other->page_map[b].major)
{
count++;
a++;
b++;
}
else if (page_map[a].major < other->page_map[b].major)
{
if (Op::passthru_left)
count++;
a++;
}
else
{
if (Op::passthru_right)
count++;
b++;
}
}
if (Op::passthru_left)
count += na - a;
if (Op::passthru_right)
count += nb - b;
if (!resize (count))
return;
/* Process in-place backward. */
a = na;
b = nb;
for (; a && b; )
{
if (page_map[a - 1].major == other->page_map[b - 1].major)
{
a--;
b--;
Op::process (page_at (--count).v, page_at (a).v, other->page_at (b).v);
}
else if (page_map[a - 1].major > other->page_map[b - 1].major)
{
a--;
if (Op::passthru_left)
page_at (--count).v = page_at (a).v;
}
else
{
b--;
if (Op::passthru_right)
page_at (--count).v = other->page_at (b).v;
}
}
if (Op::passthru_left)
while (a)
page_at (--count).v = page_at (--a).v;
if (Op::passthru_right)
while (b)
page_at (--count).v = other->page_at (--b).v;
assert (!count);
}
inline void union_ (const hb_set_t *other)
{
process<HbOpOr> (other);
}
inline void intersect (const hb_set_t *other)
{
process<HbOpAnd> (other);
}
inline void subtract (const hb_set_t *other)
{
process<HbOpMinus> (other);
}
inline void symmetric_difference (const hb_set_t *other)
{
process<HbOpXor> (other);
}
inline bool next (hb_codepoint_t *codepoint) const
{
if (unlikely (*codepoint == INVALID)) {
*codepoint = get_min ();
return *codepoint != INVALID;
}
page_map_t map = {get_major (*codepoint), 0};
unsigned int i;
page_map.bfind (&map, &i);
if (i < page_map.len)
{
if (pages[page_map[i].index].next (codepoint))
{
*codepoint += page_map[i].major * page_t::PAGE_BITS;
return true;
}
i++;
}
for (; i < page_map.len; i++)
{
hb_codepoint_t m = pages[page_map[i].index].get_min ();
if (m != INVALID)
{
*codepoint = page_map[i].major * page_t::PAGE_BITS + m;
return true;
}
}
*codepoint = INVALID;
return false;
}
inline bool next_range (hb_codepoint_t *first, hb_codepoint_t *last) const
{
hb_codepoint_t i;
i = *last;
if (!next (&i))
{
*last = *first = INVALID;
return false;
}
*last = *first = i;
while (next (&i) && i == *last + 1)
(*last)++;
return true;
}
inline unsigned int get_population (void) const
{
unsigned int pop = 0;
unsigned int count = pages.len;
for (unsigned int i = 0; i < count; i++)
pop += pages[i].get_population ();
return pop;
}
inline hb_codepoint_t get_min (void) const
{
unsigned int count = pages.len;
for (unsigned int i = 0; i < count; i++)
if (!page_at (i).is_empty ())
return page_map[i].major * page_t::PAGE_BITS + page_at (i).get_min ();
return INVALID;
}
inline hb_codepoint_t get_max (void) const
{
unsigned int count = pages.len;
for (int i = count - 1; i >= 0; i++)
if (!page_at (i).is_empty ())
return page_map[i].major * page_t::PAGE_BITS + page_at (i).get_max ();
return INVALID;
}
static const hb_codepoint_t INVALID = HB_SET_VALUE_INVALID;
inline page_t *page_for_insert (hb_codepoint_t g)
{
page_map_t map = {get_major (g), pages.len};
unsigned int i;
if (!page_map.bfind (&map, &i))
{
if (!resize (pages.len + 1))
return nullptr;
pages[map.index].init0 ();
memmove (&page_map[i + 1], &page_map[i], (page_map.len - 1 - i) * sizeof (page_map[0]));
page_map[i] = map;
}
return &pages[page_map[i].index];
}
inline page_t *page_for (hb_codepoint_t g)
{
page_map_t key = {get_major (g)};
const page_map_t *found = page_map.bsearch (&key);
if (found)
return &pages[found->index];
return nullptr;
}
inline const page_t *page_for (hb_codepoint_t g) const
{
page_map_t key = {get_major (g)};
const page_map_t *found = page_map.bsearch (&key);
if (found)
return &pages[found->index];
return nullptr;
}
inline page_t &page_at (unsigned int i) { return pages[page_map[i].index]; }
inline const page_t &page_at (unsigned int i) const { return pages[page_map[i].index]; }
inline unsigned int get_major (hb_codepoint_t g) const { return g / page_t::PAGE_BITS; }
inline hb_codepoint_t major_start (unsigned int major) const { return major * page_t::PAGE_BITS; }
};
#endif /* HB_SET_PRIVATE_HH */