88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/*
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* Copyright © 2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_SET_PRIVATE_HH
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#define HB_SET_PRIVATE_HH
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#include "hb-private.hh"
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#include "hb-set.h"
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#include "hb-object-private.hh"
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struct _hb_set_t
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{
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inline void clear (void) {
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memset (elts, 0, sizeof elts);
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}
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inline void add (hb_codepoint_t g)
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{
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if (unlikely (g > MAX_G)) return;
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elt (g) |= mask (g);
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}
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inline void del (hb_codepoint_t g)
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{
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if (unlikely (g > MAX_G)) return;
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elt (g) &= ~mask (g);
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}
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inline bool has (hb_codepoint_t g) const
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{
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if (unlikely (g > MAX_G)) return false;
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return !!(elt (g) & mask (g));
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}
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inline bool intersects (hb_codepoint_t first,
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hb_codepoint_t last) const
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{
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if (unlikely (first > MAX_G)) return false;
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if (unlikely (last > MAX_G)) last = MAX_G;
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unsigned int end = last + 1;
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for (hb_codepoint_t i = first; i < end; i++)
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if (has (i))
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return true;
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return false;
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}
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typedef uint32_t elt_t;
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static const unsigned int MAX_G = 65536 - 1;
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static const unsigned int SHIFT = 5;
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static const unsigned int BITS = (1 << SHIFT);
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static const unsigned int MASK = BITS - 1;
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elt_t &elt (hb_codepoint_t g) { return elts[g >> SHIFT]; }
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elt_t elt (hb_codepoint_t g) const { return elts[g >> SHIFT]; }
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elt_t mask (hb_codepoint_t g) const { return elt_t (1) << (g & MASK); }
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hb_object_header_t header;
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elt_t elts[(MAX_G + 1 + (BITS - 1)) / BITS]; /* 8kb */
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ASSERT_STATIC (sizeof (elt_t) * 8 == BITS);
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ASSERT_STATIC (sizeof (elts) * 8 > MAX_G);
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};
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#endif /* HB_SET_PRIVATE_HH */
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