[ot] Start implementing cmap table
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@ -35,6 +35,7 @@ HBSOURCES = \
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hb-object-private.hh \
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hb-object-private.hh \
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hb-open-file-private.hh \
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hb-open-file-private.hh \
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hb-open-type-private.hh \
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hb-open-type-private.hh \
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hb-ot-cmap-table.hh \
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hb-ot-head-table.hh \
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hb-ot-head-table.hh \
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hb-ot-hhea-table.hh \
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hb-ot-hhea-table.hh \
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hb-ot-hmtx-table.hh \
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hb-ot-hmtx-table.hh \
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@ -0,0 +1,171 @@
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/*
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* Copyright © 2014 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_OT_CMAP_TABLE_HH
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#define HB_OT_CMAP_TABLE_HH
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#include "hb-open-type-private.hh"
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namespace OT {
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/*
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* cmap -- Character To Glyph Index Mapping Table
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*/
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#define HB_OT_TAG_cmap HB_TAG('c','m','a','p')
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struct CmapSubtableFormat4
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{
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friend struct CmapSubtable;
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private:
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inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
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{
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return false;
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE (this);
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return TRACE_RETURN (c->check_struct (this) &&
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c->check_range (this, length) &&
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16 + 4 * (unsigned int) segCountX2 < length);
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}
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protected:
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USHORT format; /* Format number is set to 4. */
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USHORT length; /* This is the length in bytes of the
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* subtable. */
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USHORT language; /* Ignore. */
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USHORT segCountX2; /* 2 x segCount. */
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USHORT searchRange; /* 2 * (2**floor(log2(segCount))) */
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USHORT entrySelector; /* log2(searchRange/2) */
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USHORT rangeShift; /* 2 x segCount - searchRange */
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USHORT values[VAR];
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#if 0
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USHORT endCount[segCount]; /* End characterCode for each segment,
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* last=0xFFFF. */
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USHORT reservedPad; /* Set to 0. */
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USHORT startCount[segCount]; /* Start character code for each segment. */
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SHORT idDelta[segCount]; /* Delta for all character codes in segment. */
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USHORT idRangeOffset[segCount];/* Offsets into glyphIdArray or 0 */
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USHORT glyphIdArray[VAR]; /* Glyph index array (arbitrary length) */
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#endif
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public:
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DEFINE_SIZE_ARRAY (14, values);
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};
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struct CmapSubtable
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{
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inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
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{
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switch (u.format) {
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case 4: return u.format4.get_glyph(codepoint, glyph);
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default:return false;
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}
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE (this);
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if (!u.format.sanitize (c)) return TRACE_RETURN (false);
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switch (u.format) {
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case 4: return TRACE_RETURN (u.format4.sanitize (c));
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default:return TRACE_RETURN (true);
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}
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}
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protected:
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union {
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USHORT format; /* Format identifier */
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CmapSubtableFormat4 format4;
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} u;
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public:
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DEFINE_SIZE_UNION (2, format);
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};
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struct EncodingRecord
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{
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int cmp (const EncodingRecord &other) const
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{
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int ret;
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ret = other.platformID.cmp (platformID);
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if (ret) return ret;
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ret = other.encodingID.cmp (encodingID);
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if (ret) return ret;
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return 0;
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}
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inline bool sanitize (hb_sanitize_context_t *c, void *base) {
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TRACE_SANITIZE (this);
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return TRACE_RETURN (c->check_struct (this) &&
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subtable.sanitize (c, base));
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}
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USHORT platformID; /* Platform ID. */
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USHORT encodingID; /* Platform-specific encoding ID. */
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LongOffsetTo<CmapSubtable>
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subtable; /* Byte offset from beginning of table to the subtable for this encoding. */
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public:
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DEFINE_SIZE_STATIC (8);
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};
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struct cmap
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{
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static const hb_tag_t tableTag = HB_OT_TAG_cmap;
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inline unsigned int find_subtable (unsigned int platform_id,
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unsigned int encoding_id) const
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{
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EncodingRecord key;
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key.platformID.set (platform_id);
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key.encodingID.set (encoding_id);
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return encodingRecord.search (key);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE (this);
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return TRACE_RETURN (c->check_struct (this) &&
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likely (version == 0) &&
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encodingRecord.sanitize (c, this));
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}
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USHORT version; /* Table version number (0). */
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ArrayOf<EncodingRecord> encodingRecord; /* Encoding tables. */
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public:
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DEFINE_SIZE_ARRAY (4, encodingRecord);
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};
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} /* namespace OT */
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#endif /* HB_OT_CMAP_TABLE_HH */
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@ -30,6 +30,7 @@
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#include "hb-font-private.hh"
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#include "hb-font-private.hh"
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#include "hb-ot-cmap-table.hh"
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#include "hb-ot-hhea-table.hh"
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#include "hb-ot-hhea-table.hh"
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#include "hb-ot-hmtx-table.hh"
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#include "hb-ot-hmtx-table.hh"
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