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-rw-r--r--thirdparty/harfbuzz/src/hb-set.hh875
1 files changed, 54 insertions, 821 deletions
diff --git a/thirdparty/harfbuzz/src/hb-set.hh b/thirdparty/harfbuzz/src/hb-set.hh
index ae8b5eb10f..437e234361 100644
--- a/thirdparty/harfbuzz/src/hb-set.hh
+++ b/thirdparty/harfbuzz/src/hb-set.hh
@@ -1,5 +1,6 @@
/*
* Copyright © 2012,2017 Google, Inc.
+ * Copyright © 2021 Behdad Esfahbod
*
* This is part of HarfBuzz, a text shaping library.
*
@@ -28,420 +29,67 @@
#define HB_SET_HH
#include "hb.hh"
-#include "hb-machinery.hh"
+#include "hb-bit-set-invertible.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
+template <typename impl_t>
+struct hb_sparseset_t
{
- HB_DELETE_COPY_ASSIGN (hb_set_t);
- hb_set_t () { init (); }
- ~hb_set_t () { fini (); }
-
- struct page_map_t
- {
- int cmp (const page_map_t &o) const { return (int) o.major - (int) major; }
-
- uint32_t major;
- uint32_t index;
- };
-
- struct page_t
- {
- void init0 () { v.clear (); }
- void init1 () { v.clear (0xFF); }
-
- unsigned int len () const
- { return ARRAY_LENGTH_CONST (v); }
-
- bool is_empty () const
- {
- for (unsigned int i = 0; i < len (); i++)
- if (v[i])
- return false;
- return true;
- }
-
- void add (hb_codepoint_t g) { elt (g) |= mask (g); }
- void del (hb_codepoint_t g) { elt (g) &= ~mask (g); }
- bool get (hb_codepoint_t g) const { return elt (g) & mask (g); }
-
- 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);
- }
- }
-
- void del_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, 0, (char *) lb - (char *) la);
-
- *lb &= ~((mask (b) << 1) - 1);
- }
- }
-
- bool is_equal (const page_t *other) const
- {
- return 0 == hb_memcmp (&v, &other->v, sizeof (v));
- }
-
- unsigned int get_population () const
- {
- unsigned int pop = 0;
- for (unsigned int i = 0; i < len (); i++)
- pop += hb_popcount (v[i]);
- return pop;
- }
-
- 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;
-
- const elt_t vv = v[i] & ~((elt_t (1) << j) - 1);
- for (const elt_t *p = &vv; i < len (); p = &v[++i])
- if (*p)
- {
- *codepoint = i * ELT_BITS + elt_get_min (*p);
- return true;
- }
-
- *codepoint = INVALID;
- return false;
- }
- bool previous (hb_codepoint_t *codepoint) const
- {
- unsigned int m = (*codepoint - 1) & MASK;
- if (m == MASK)
- {
- *codepoint = INVALID;
- return false;
- }
- unsigned int i = m / ELT_BITS;
- unsigned int j = m & ELT_MASK;
-
- /* Fancy mask to avoid shifting by elt_t bitsize, which is undefined. */
- const elt_t mask = j < 8 * sizeof (elt_t) - 1 ?
- ((elt_t (1) << (j + 1)) - 1) :
- (elt_t) -1;
- const elt_t vv = v[i] & mask;
- const elt_t *p = &vv;
- while (true)
- {
- if (*p)
- {
- *codepoint = i * ELT_BITS + elt_get_max (*p);
- return true;
- }
- if ((int) i <= 0) break;
- p = &v[--i];
- }
-
- *codepoint = INVALID;
- return false;
- }
- hb_codepoint_t get_min () const
- {
- for (unsigned int i = 0; i < len (); i++)
- if (v[i])
- return i * ELT_BITS + elt_get_min (v[i]);
- return INVALID;
- }
- hb_codepoint_t get_max () const
- {
- for (int i = len () - 1; i >= 0; i--)
- if (v[i])
- return i * ELT_BITS + elt_get_max (v[i]);
- return 0;
- }
-
- typedef unsigned long long elt_t;
- static constexpr unsigned PAGE_BITS = 512;
- static_assert ((PAGE_BITS & ((PAGE_BITS) - 1)) == 0, "");
-
- 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; }
-
- 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_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, "");
-
- 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); }
+ hb_object_header_t header;
+ impl_t s;
- vector_t v;
- };
- static_assert (page_t::PAGE_BITS == sizeof (page_t) * 8, "");
+ hb_sparseset_t () { init (); }
+ ~hb_sparseset_t () { fini (); }
- hb_object_header_t header;
- bool successful; /* Allocations successful */
- mutable unsigned int population;
- hb_sorted_vector_t<page_map_t> page_map;
- hb_vector_t<page_t> pages;
+ hb_sparseset_t (const hb_sparseset_t& other) : hb_sparseset_t () { set (other); }
+ void operator= (const hb_sparseset_t& other) { set (other); }
+ // TODO Add move construtor/assign
+ // TODO Add constructor for Iterator
- void init_shallow ()
- {
- successful = true;
- population = 0;
- page_map.init ();
- pages.init ();
- }
+ void init_shallow () { s.init (); }
void init ()
{
hb_object_init (this);
init_shallow ();
}
- void fini_shallow ()
- {
- population = 0;
- page_map.fini ();
- pages.fini ();
- }
+ void fini_shallow () { s.fini (); }
void fini ()
{
hb_object_fini (this);
fini_shallow ();
}
- bool in_error () const { return !successful; }
-
- bool resize (unsigned int count)
- {
- if (unlikely (count > pages.length && !successful)) return false;
- if (!pages.resize (count) || !page_map.resize (count))
- {
- pages.resize (page_map.length);
- successful = false;
- return false;
- }
- return true;
- }
-
- void reset ()
- {
- successful = true;
- clear ();
- }
-
- void clear ()
- {
- if (resize (0))
- population = 0;
- }
- bool is_empty () const
- {
- unsigned int count = pages.length;
- for (unsigned int i = 0; i < count; i++)
- if (!pages[i].is_empty ())
- return false;
- return true;
- }
explicit operator bool () const { return !is_empty (); }
- void dirty () { population = UINT_MAX; }
-
- void add (hb_codepoint_t g)
- {
- if (unlikely (!successful)) return;
- if (unlikely (g == INVALID)) return;
- dirty ();
- page_t *page = page_for_insert (g); if (unlikely (!page)) return;
- page->add (g);
- }
- bool add_range (hb_codepoint_t a, hb_codepoint_t b)
- {
- if (unlikely (!successful)) return true; /* https://github.com/harfbuzz/harfbuzz/issues/657 */
- if (unlikely (a > b || a == INVALID || b == INVALID)) return false;
- dirty ();
- 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 false;
- page->add_range (a, b);
- }
- else
- {
- page_t *page = page_for_insert (a); if (unlikely (!page)) return false;
- page->add_range (a, major_start (ma + 1) - 1);
+ void err () { s.err (); }
+ bool in_error () const { return s.in_error (); }
- for (unsigned int m = ma + 1; m < mb; m++)
- {
- page = page_for_insert (major_start (m)); if (unlikely (!page)) return false;
- page->init1 ();
- }
+ void reset () { s.reset (); }
+ void clear () { s.clear (); }
+ void invert () { s.invert (); }
+ bool is_empty () const { return s.is_empty (); }
- page = page_for_insert (b); if (unlikely (!page)) return false;
- page->add_range (major_start (mb), b);
- }
- return true;
- }
+ void add (hb_codepoint_t g) { s.add (g); }
+ bool add_range (hb_codepoint_t a, hb_codepoint_t b) { return s.add_range (a, b); }
template <typename T>
void add_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
- {
- if (unlikely (!successful)) return;
- if (!count) return;
- dirty ();
- hb_codepoint_t g = *array;
- while (count)
- {
- unsigned int m = get_major (g);
- page_t *page = page_for_insert (g); if (unlikely (!page)) return;
- unsigned int start = major_start (m);
- unsigned int end = major_start (m + 1);
- do
- {
- page->add (g);
-
- array = &StructAtOffsetUnaligned<T> (array, stride);
- count--;
- }
- while (count && (g = *array, start <= g && g < end));
- }
- }
+ { s.add_array (array, count, stride); }
+ template <typename T>
+ void add_array (const hb_array_t<const T>& arr) { add_array (&arr, arr.len ()); }
/* Might return false if array looks unsorted.
* Used for faster rejection of corrupt data. */
template <typename T>
bool add_sorted_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
- {
- if (unlikely (!successful)) return true; /* https://github.com/harfbuzz/harfbuzz/issues/657 */
- if (!count) return true;
- dirty ();
- hb_codepoint_t g = *array;
- hb_codepoint_t last_g = g;
- while (count)
- {
- unsigned int m = get_major (g);
- page_t *page = page_for_insert (g); if (unlikely (!page)) return false;
- unsigned int end = major_start (m + 1);
- do
- {
- /* If we try harder we can change the following comparison to <=;
- * Not sure if it's worth it. */
- if (g < last_g) return false;
- last_g = g;
- page->add (g);
-
- array = (const T *) ((const char *) array + stride);
- count--;
- }
- while (count && (g = *array, g < end));
- }
- return true;
- }
-
- void del (hb_codepoint_t g)
- {
- /* TODO perform op even if !successful. */
- if (unlikely (!successful)) return;
- page_t *page = page_for (g);
- if (!page)
- return;
- dirty ();
- page->del (g);
- }
-
- private:
- void del_pages (int ds, int de)
- {
- if (ds <= de)
- {
- // Pre-allocate the workspace that compact() will need so we can bail on allocation failure
- // before attempting to rewrite the page map.
- hb_vector_t<unsigned> compact_workspace;
- if (unlikely (!allocate_compact_workspace (compact_workspace))) return;
-
- unsigned int write_index = 0;
- for (unsigned int i = 0; i < page_map.length; i++)
- {
- int m = (int) page_map[i].major;
- if (m < ds || de < m)
- page_map[write_index++] = page_map[i];
- }
- compact (compact_workspace, write_index);
- resize (write_index);
- }
- }
+ { return s.add_sorted_array (array, count, stride); }
+ template <typename T>
+ bool add_sorted_array (const hb_sorted_array_t<const T>& arr) { return add_sorted_array (&arr, arr.len ()); }
+ void del (hb_codepoint_t g) { s.del (g); }
+ void del_range (hb_codepoint_t a, hb_codepoint_t b) { s.del_range (a, b); }
- public:
- void del_range (hb_codepoint_t a, hb_codepoint_t b)
- {
- /* TODO perform op even if !successful. */
- if (unlikely (!successful)) return;
- if (unlikely (a > b || a == INVALID || b == INVALID)) return;
- dirty ();
- unsigned int ma = get_major (a);
- unsigned int mb = get_major (b);
- /* Delete pages from ds through de if ds <= de. */
- int ds = (a == major_start (ma))? (int) ma: (int) (ma + 1);
- int de = (b + 1 == major_start (mb + 1))? (int) mb: ((int) mb - 1);
- if (ds > de || (int) ma < ds)
- {
- page_t *page = page_for (a);
- if (page)
- {
- if (ma == mb)
- page->del_range (a, b);
- else
- page->del_range (a, major_start (ma + 1) - 1);
- }
- }
- if (de < (int) mb && ma != mb)
- {
- page_t *page = page_for (b);
- if (page)
- page->del_range (major_start (mb), b);
- }
- del_pages (ds, de);
- }
-
- bool get (hb_codepoint_t g) const
- {
- const page_t *page = page_for (g);
- if (!page)
- return false;
- return page->get (g);
- }
+ bool get (hb_codepoint_t g) const { return s.get (g); }
/* Has interface. */
static constexpr bool SENTINEL = false;
@@ -452,464 +100,49 @@ struct hb_set_t
bool operator () (hb_codepoint_t k) const { return has (k); }
/* Sink interface. */
- hb_set_t& operator << (hb_codepoint_t v)
+ hb_sparseset_t& operator << (hb_codepoint_t v)
{ add (v); return *this; }
- hb_set_t& operator << (const hb_pair_t<hb_codepoint_t, hb_codepoint_t>& range)
+ hb_sparseset_t& operator << (const hb_pair_t<hb_codepoint_t, hb_codepoint_t>& range)
{ add_range (range.first, range.second); return *this; }
bool intersects (hb_codepoint_t first, hb_codepoint_t last) const
- {
- hb_codepoint_t c = first - 1;
- return next (&c) && c <= last;
- }
- void set (const hb_set_t *other)
- {
- if (unlikely (!successful)) return;
- unsigned int count = other->pages.length;
- if (!resize (count))
- return;
- population = other->population;
- memcpy ((void *) pages, (const void *) other->pages, count * pages.item_size);
- memcpy ((void *) page_map, (const void *) other->page_map, count * page_map.item_size);
- }
-
- bool is_equal (const hb_set_t *other) const
- {
- if (get_population () != other->get_population ())
- return false;
-
- unsigned int na = pages.length;
- unsigned int nb = other->pages.length;
+ { return s.intersects (first, last); }
- 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; }
+ void set (const hb_sparseset_t &other) { s.set (other.s); }
- return true;
- }
-
- bool is_subset (const hb_set_t *larger_set) const
- {
- if (get_population () > larger_set->get_population ())
- return false;
-
- /* TODO Optimize to use pages. */
- hb_codepoint_t c = INVALID;
- while (next (&c))
- if (!larger_set->has (c))
- return false;
-
- return true;
- }
-
- bool allocate_compact_workspace(hb_vector_t<unsigned>& workspace)
- {
- if (unlikely(!workspace.resize (pages.length)))
- {
- successful = false;
- return false;
- }
-
- return true;
- }
-
-
- /*
- * workspace should be a pre-sized vector allocated to hold at exactly pages.length
- * elements.
- */
- void compact (hb_vector_t<unsigned>& workspace,
- unsigned int length)
- {
- assert(workspace.length == pages.length);
- hb_vector_t<unsigned>& old_index_to_page_map_index = workspace;
-
- hb_fill (old_index_to_page_map_index.writer(), 0xFFFFFFFF);
- /* TODO(iter) Rewrite as dagger? */
- for (unsigned i = 0; i < length; i++)
- old_index_to_page_map_index[page_map[i].index] = i;
-
- compact_pages (old_index_to_page_map_index);
- }
-
- void compact_pages (const hb_vector_t<unsigned>& old_index_to_page_map_index)
- {
- unsigned int write_index = 0;
- for (unsigned int i = 0; i < pages.length; i++)
- {
- if (old_index_to_page_map_index[i] == 0xFFFFFFFF) continue;
+ bool is_equal (const hb_sparseset_t &other) const { return s.is_equal (other.s); }
- if (write_index < i)
- pages[write_index] = pages[i];
+ bool is_subset (const hb_sparseset_t &larger_set) const { return s.is_subset (larger_set.s); }
- page_map[old_index_to_page_map_index[i]].index = write_index;
- write_index++;
- }
- }
-
- template <typename Op>
- void process (const Op& op, const hb_set_t *other)
- {
- const bool passthru_left = op (1, 0);
- const bool passthru_right = op (0, 1);
-
- if (unlikely (!successful)) return;
-
- dirty ();
-
- unsigned int na = pages.length;
- unsigned int nb = other->pages.length;
- unsigned int next_page = na;
-
- unsigned int count = 0, newCount = 0;
- unsigned int a = 0, b = 0;
- unsigned int write_index = 0;
-
- // Pre-allocate the workspace that compact() will need so we can bail on allocation failure
- // before attempting to rewrite the page map.
- hb_vector_t<unsigned> compact_workspace;
- if (!passthru_left && unlikely (!allocate_compact_workspace (compact_workspace))) return;
-
- for (; a < na && b < nb; )
- {
- if (page_map[a].major == other->page_map[b].major)
- {
- if (!passthru_left)
- {
- // Move page_map entries that we're keeping from the left side set
- // to the front of the page_map vector. This isn't necessary if
- // passthru_left is set since no left side pages will be removed
- // in that case.
- if (write_index < a)
- page_map[write_index] = page_map[a];
- write_index++;
- }
-
- count++;
- a++;
- b++;
- }
- else if (page_map[a].major < other->page_map[b].major)
- {
- if (passthru_left)
- count++;
- a++;
- }
- else
- {
- if (passthru_right)
- count++;
- b++;
- }
- }
- if (passthru_left)
- count += na - a;
- if (passthru_right)
- count += nb - b;
+ void union_ (const hb_sparseset_t &other) { s.union_ (other.s); }
+ void intersect (const hb_sparseset_t &other) { s.intersect (other.s); }
+ void subtract (const hb_sparseset_t &other) { s.subtract (other.s); }
+ void symmetric_difference (const hb_sparseset_t &other) { s.symmetric_difference (other.s); }
- if (!passthru_left)
- {
- na = write_index;
- next_page = write_index;
- compact (compact_workspace, write_index);
- }
-
- if (!resize (count))
- return;
-
- newCount = count;
-
- /* 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--;
- count--;
- page_map[count] = page_map[a];
- page_at (count).v = op (page_at (a).v, other->page_at (b).v);
- }
- else if (page_map[a - 1].major > other->page_map[b - 1].major)
- {
- a--;
- if (passthru_left)
- {
- count--;
- page_map[count] = page_map[a];
- }
- }
- else
- {
- b--;
- if (passthru_right)
- {
- count--;
- page_map[count].major = other->page_map[b].major;
- page_map[count].index = next_page++;
- page_at (count).v = other->page_at (b).v;
- }
- }
- }
- if (passthru_left)
- while (a)
- {
- a--;
- count--;
- page_map[count] = page_map [a];
- }
- if (passthru_right)
- while (b)
- {
- b--;
- count--;
- page_map[count].major = other->page_map[b].major;
- page_map[count].index = next_page++;
- page_at (count).v = other->page_at (b).v;
- }
- assert (!count);
- if (pages.length > newCount)
- // This resize() doesn't need to be checked because we can't get here
- // if the set is currently in_error() and this only resizes downwards
- // which will always succeed if the set is not in_error().
- resize (newCount);
- }
-
- void union_ (const hb_set_t *other)
- {
- process (hb_bitwise_or, other);
- }
- void intersect (const hb_set_t *other)
- {
- process (hb_bitwise_and, other);
- }
- void subtract (const hb_set_t *other)
- {
- process (hb_bitwise_sub, other);
- }
- void symmetric_difference (const hb_set_t *other)
- {
- process (hb_bitwise_xor, other);
- }
- 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, HB_BFIND_NOT_FOUND_STORE_CLOSEST);
- if (i < page_map.length && page_map[i].major == map.major)
- {
- if (pages[page_map[i].index].next (codepoint))
- {
- *codepoint += page_map[i].major * page_t::PAGE_BITS;
- return true;
- }
- i++;
- }
- for (; i < page_map.length; 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;
- }
- bool previous (hb_codepoint_t *codepoint) const
- {
- if (unlikely (*codepoint == INVALID)) {
- *codepoint = get_max ();
- return *codepoint != INVALID;
- }
-
- page_map_t map = {get_major (*codepoint), 0};
- unsigned int i;
- page_map.bfind (map, &i, HB_BFIND_NOT_FOUND_STORE_CLOSEST);
- if (i < page_map.length && page_map[i].major == map.major)
- {
- if (pages[page_map[i].index].previous (codepoint))
- {
- *codepoint += page_map[i].major * page_t::PAGE_BITS;
- return true;
- }
- }
- i--;
- for (; (int) i >= 0; i--)
- {
- hb_codepoint_t m = pages[page_map[i].index].get_max ();
- if (m != INVALID)
- {
- *codepoint = page_map[i].major * page_t::PAGE_BITS + m;
- return true;
- }
- }
- *codepoint = INVALID;
- return false;
- }
+ bool next (hb_codepoint_t *codepoint) const { return s.next (codepoint); }
+ bool previous (hb_codepoint_t *codepoint) const { return s.previous (codepoint); }
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;
- }
-
- /* TODO Speed up. */
- *last = *first = i;
- while (next (&i) && i == *last + 1)
- (*last)++;
-
- return true;
- }
+ { return s.next_range (first, last); }
bool previous_range (hb_codepoint_t *first, hb_codepoint_t *last) const
- {
- hb_codepoint_t i;
+ { return s.previous_range (first, last); }
- i = *first;
- if (!previous (&i))
- {
- *last = *first = INVALID;
- return false;
- }
-
- /* TODO Speed up. */
- *last = *first = i;
- while (previous (&i) && i == *first - 1)
- (*first)--;
-
- return true;
- }
-
- unsigned int get_population () const
- {
- if (population != UINT_MAX)
- return population;
+ unsigned int get_population () const { return s.get_population (); }
+ hb_codepoint_t get_min () const { return s.get_min (); }
+ hb_codepoint_t get_max () const { return s.get_max (); }
- unsigned int pop = 0;
- unsigned int count = pages.length;
- for (unsigned int i = 0; i < count; i++)
- pop += pages[i].get_population ();
-
- population = pop;
- return pop;
- }
- hb_codepoint_t get_min () const
- {
- unsigned int count = pages.length;
- 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;
- }
- hb_codepoint_t get_max () const
- {
- unsigned int count = pages.length;
- for (int i = count - 1; i >= 0; i++)
- if (!page_at (i).is_empty ())
- return page_map[(unsigned) i].major * page_t::PAGE_BITS + page_at (i).get_max ();
- return INVALID;
- }
-
- static constexpr hb_codepoint_t INVALID = HB_SET_VALUE_INVALID;
+ static constexpr hb_codepoint_t INVALID = impl_t::INVALID;
/*
* Iterator implementation.
*/
- struct iter_t : hb_iter_with_fallback_t<iter_t, hb_codepoint_t>
- {
- static constexpr bool is_sorted_iterator = true;
- iter_t (const hb_set_t &s_ = Null (hb_set_t),
- bool init = true) : s (&s_), v (INVALID), l(0)
- {
- if (init)
- {
- l = s->get_population () + 1;
- __next__ ();
- }
- }
-
- typedef hb_codepoint_t __item_t__;
- hb_codepoint_t __item__ () const { return v; }
- bool __more__ () const { return v != INVALID; }
- void __next__ () { s->next (&v); if (l) l--; }
- void __prev__ () { s->previous (&v); }
- unsigned __len__ () const { return l; }
- iter_t end () const { return iter_t (*s, false); }
- bool operator != (const iter_t& o) const
- { return s != o.s || v != o.v; }
-
- protected:
- const hb_set_t *s;
- hb_codepoint_t v;
- unsigned l;
- };
- iter_t iter () const { return iter_t (*this); }
+ using iter_t = typename impl_t::iter_t;
+ iter_t iter () const { return iter_t (this->s); }
operator iter_t () const { return iter (); }
+};
- protected:
-
- page_t *page_for_insert (hb_codepoint_t g)
- {
- page_map_t map = {get_major (g), pages.length};
- unsigned int i;
- if (!page_map.bfind (map, &i, HB_BFIND_NOT_FOUND_STORE_CLOSEST))
- {
- if (!resize (pages.length + 1))
- return nullptr;
+struct hb_set_t : hb_sparseset_t<hb_bit_set_invertible_t> {};
- pages[map.index].init0 ();
- memmove (page_map + i + 1,
- page_map + i,
- (page_map.length - 1 - i) * page_map.item_size);
- page_map[i] = map;
- }
- return &pages[page_map[i].index];
- }
- 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;
- }
- 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;
- }
- page_t &page_at (unsigned int i) { return pages[page_map[i].index]; }
- const page_t &page_at (unsigned int i) const { return pages[page_map[i].index]; }
- unsigned int get_major (hb_codepoint_t g) const { return g / page_t::PAGE_BITS; }
- hb_codepoint_t major_start (unsigned int major) const { return major * page_t::PAGE_BITS; }
-};
+static_assert (hb_set_t::INVALID == HB_SET_VALUE_INVALID, "");
#endif /* HB_SET_HH */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 02:37:26 +0000