Roll harfbuzz-ng 3b8fd9c48f4bde368bf2d465c148b9743a9216ee

third_party/harfbuzz-ng/src/hb-set-private.hh

+/*
+ * Copyright © 2012  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-set.h"
+#include "hb-object-private.hh"
+
+
+/* TODO Make this faster and memmory efficient. */
+
+struct _hb_set_t
+{
+  inline void init (void) {
+    clear ();
+  }
+  inline void fini (void) {
+  }
+  inline void clear (void) {
+    memset (elts, 0, sizeof elts);
+  }
+  inline bool empty (void) const {
+    for (unsigned int i = 0; i < ARRAY_LENGTH (elts); i++)
+      if (elts[i])
+        return false;
+    return true;
+  }
+  inline void add (hb_codepoint_t g)
+  {
+    if (unlikely (g == SENTINEL)) return;
+    if (unlikely (g > MAX_G)) return;
+    elt (g) |= mask (g);
+  }
+  inline void del (hb_codepoint_t g)
+  {
+    if (unlikely (g > MAX_G)) return;
+    elt (g) &= ~mask (g);
+  }
+  inline bool has (hb_codepoint_t g) const
+  {
+    if (unlikely (g > MAX_G)) return false;
+    return !!(elt (g) & mask (g));
+  }
+  inline bool intersects (hb_codepoint_t first,
+                          hb_codepoint_t last) const
+  {
+    if (unlikely (first > MAX_G)) return false;
+    if (unlikely (last  > MAX_G)) last = MAX_G;
+    unsigned int end = last + 1;
+    for (hb_codepoint_t i = first; i < end; i++)
+      if (has (i))
+        return true;
+    return false;
+  }
+  inline bool equal (const hb_set_t *other) const
+  {
+    for (unsigned int i = 0; i < ELTS; i++)
+      if (elts[i] != other->elts[i])
+        return false;
+    return true;
+  }
+  inline void set (const hb_set_t *other)
+  {
+    for (unsigned int i = 0; i < ELTS; i++)
+      elts[i] = other->elts[i];
+  }
+  inline void union_ (const hb_set_t *other)
+  {
+    for (unsigned int i = 0; i < ELTS; i++)
+      elts[i] |= other->elts[i];
+  }
+  inline void intersect (const hb_set_t *other)
+  {
+    for (unsigned int i = 0; i < ELTS; i++)
+      elts[i] &= other->elts[i];
+  }
+  inline void subtract (const hb_set_t *other)
+  {
+    for (unsigned int i = 0; i < ELTS; i++)
+      elts[i] &= ~other->elts[i];
+  }
+  inline void symmetric_difference (const hb_set_t *other)
+  {
+    for (unsigned int i = 0; i < ELTS; i++)
+      elts[i] ^= other->elts[i];
+  }
+  inline bool next (hb_codepoint_t *codepoint)
+  {
+    if (unlikely (*codepoint == SENTINEL)) {
+      hb_codepoint_t i = get_min ();
+      if (i != SENTINEL) {
+        *codepoint = i;
+        return true;
+      } else
+        return false;
+    }
+    for (hb_codepoint_t i = *codepoint + 1; i < MAX_G + 1; i++)
+      if (has (i)) {
+        *codepoint = i;
+        return true;
+      }
+    return false;
+  }
+  inline hb_codepoint_t get_min (void) const
+  {
+    for (unsigned int i = 0; i < ELTS; i++)
+      if (elts[i])
+        for (unsigned int j = 0; i < BITS; j++)
+          if (elts[i] & (1 << j))
+            return i * BITS + j;
+    return SENTINEL;
+  }
+  inline hb_codepoint_t get_max (void) const
+  {
+    for (unsigned int i = ELTS; i; i--)
+      if (elts[i - 1])
+        for (unsigned int j = BITS; j; j--)
+          if (elts[i - 1] & (1 << (j - 1)))
+            return (i - 1) * BITS + (j - 1);
+    return SENTINEL;
+  }
+
+  typedef uint32_t elt_t;
+  static const unsigned int MAX_G = 65536 - 1; /* XXX Fix this... */
+  static const unsigned int SHIFT = 5;
+  static const unsigned int BITS = (1 << SHIFT);
+  static const unsigned int MASK = BITS - 1;
+  static const unsigned int ELTS = (MAX_G + 1 + (BITS - 1)) / BITS;
+  static  const hb_codepoint_t SENTINEL = (hb_codepoint_t) -1;
+
+  elt_t &elt (hb_codepoint_t g) { return elts[g >> SHIFT]; }
+  elt_t elt (hb_codepoint_t g) const { return elts[g >> SHIFT]; }
+  elt_t mask (hb_codepoint_t g) const { return elt_t (1) << (g & MASK); }
+
+  hb_object_header_t header;
+  elt_t elts[ELTS]; /* XXX 8kb */
+
+  ASSERT_STATIC (sizeof (elt_t) * 8 == BITS);
+  ASSERT_STATIC (sizeof (elt_t) * 8 * ELTS > MAX_G);
+};
+
+
+
+#endif /* HB_SET_PRIVATE_HH */