321 lines
9.1 KiB
C++
321 lines
9.1 KiB
C++
/*
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* Copyright (C) 2007,2008,2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, an OpenType Layout engine 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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* Red Hat Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_LAYOUT_GDEF_PRIVATE_HH
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#define HB_OT_LAYOUT_GDEF_PRIVATE_HH
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#include "hb-ot-layout-common-private.hh"
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struct GlyphClassDef : ClassDef
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{
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enum {
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BaseGlyph = 0x0001u,
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LigatureGlyph = 0x0002u,
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MarkGlyph = 0x0003u,
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ComponentGlyph = 0x0004u,
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};
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};
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/*
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* Attachment List Table
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*/
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typedef ArrayOf<USHORT> AttachPoint; /* Array of contour point indices--in
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* increasing numerical order */
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ASSERT_SIZE (AttachPoint, 2);
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struct AttachList
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{
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inline bool get_attach_points (hb_codepoint_t glyph_id,
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unsigned int *point_count /* IN/OUT */,
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unsigned int *point_array /* OUT */) const
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{
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unsigned int index = (this+coverage) (glyph_id);
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if (index == NOT_COVERED)
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{
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*point_count = 0;
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return false;
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}
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const AttachPoint &points = this+attachPoint[index];
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unsigned int count = MIN (points.len, *point_count);
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for (unsigned int i = 0; i < count; i++)
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point_array[i] = points[i];
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*point_count = points.len;
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return true;
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}
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private:
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OffsetTo<Coverage>
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coverage; /* Offset to Coverage table -- from
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* beginning of AttachList table */
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OffsetArrayOf<AttachPoint>
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attachPoint; /* Array of AttachPoint tables
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* in Coverage Index order */
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};
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ASSERT_SIZE (AttachList, 4);
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/*
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* Ligature Caret Table
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*/
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struct CaretValueFormat1
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{
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friend struct CaretValue;
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private:
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inline int get_caret_value (hb_ot_layout_context_t *context, hb_codepoint_t glyph_id) const
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{
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/* XXX vertical */
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return context->font->x_scale * coordinate / 0x10000;
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}
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private:
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USHORT caretValueFormat; /* Format identifier--format = 1 */
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SHORT coordinate; /* X or Y value, in design units */
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};
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ASSERT_SIZE (CaretValueFormat1, 4);
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struct CaretValueFormat2
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{
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friend struct CaretValue;
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private:
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inline int get_caret_value (hb_ot_layout_context_t *context, hb_codepoint_t glyph_id) const
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{
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return /* TODO contour point */ 0;
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}
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private:
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USHORT caretValueFormat; /* Format identifier--format = 2 */
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USHORT caretValuePoint; /* Contour point index on glyph */
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};
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ASSERT_SIZE (CaretValueFormat2, 4);
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struct CaretValueFormat3
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{
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friend struct CaretValue;
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inline int get_caret_value (hb_ot_layout_context_t *context, hb_codepoint_t glyph_id) const
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{
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/* XXX vertical */
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return context->font->x_scale * coordinate / 0x10000 +
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(this+deviceTable).get_delta (context->font->x_ppem) << 6;
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}
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private:
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USHORT caretValueFormat; /* Format identifier--format = 3 */
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SHORT coordinate; /* X or Y value, in design units */
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OffsetTo<Device>
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deviceTable; /* Offset to Device table for X or Y
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* value--from beginning of CaretValue
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* table */
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};
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ASSERT_SIZE (CaretValueFormat3, 6);
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struct CaretValue
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{
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/* XXX we need access to a load-contour-point vfunc here */
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int get_caret_value (hb_ot_layout_context_t *context, hb_codepoint_t glyph_id) const
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{
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switch (u.format) {
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case 1: return u.format1->get_caret_value (context, glyph_id);
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case 2: return u.format2->get_caret_value (context, glyph_id);
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case 3: return u.format3->get_caret_value (context, glyph_id);
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default:return 0;
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}
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}
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private:
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union {
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USHORT format; /* Format identifier */
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CaretValueFormat1 format1[];
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CaretValueFormat2 format2[];
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CaretValueFormat3 format3[];
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} u;
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};
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ASSERT_SIZE (CaretValue, 2);
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struct LigGlyph
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{
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inline void get_lig_carets (hb_ot_layout_context_t *context,
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hb_codepoint_t glyph_id,
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unsigned int *caret_count /* IN/OUT */,
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int *caret_array /* OUT */) const
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{
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unsigned int count = MIN (carets.len, *caret_count);
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for (unsigned int i = 0; i < count; i++)
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caret_array[i] = (this+carets[i]).get_caret_value (context, glyph_id);
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*caret_count = carets.len;
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}
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private:
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OffsetArrayOf<CaretValue>
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carets; /* Offset rrray of CaretValue tables
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* --from beginning of LigGlyph table
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* --in increasing coordinate order */
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};
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ASSERT_SIZE (LigGlyph, 2);
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struct LigCaretList
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{
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inline bool get_lig_carets (hb_ot_layout_context_t *context,
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hb_codepoint_t glyph_id,
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unsigned int *caret_count /* IN/OUT */,
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int *caret_array /* OUT */) const
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{
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unsigned int index = (this+coverage) (glyph_id);
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if (index == NOT_COVERED)
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{
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*caret_count = 0;
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return false;
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}
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const LigGlyph &lig_glyph = this+ligGlyph[index];
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lig_glyph.get_lig_carets (context, glyph_id, caret_count, caret_array);
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return true;
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}
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private:
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OffsetTo<Coverage>
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coverage; /* Offset to Coverage table--from
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* beginning of LigCaretList table */
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OffsetArrayOf<LigGlyph>
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ligGlyph; /* Array of LigGlyph tables
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* in Coverage Index order */
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};
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ASSERT_SIZE (LigCaretList, 4);
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struct MarkGlyphSetsFormat1
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{
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inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
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{ return (this+coverage[set_index]).get_coverage (glyph_id) != NOT_COVERED; }
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private:
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USHORT format; /* Format identifier--format = 1 */
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LongOffsetArrayOf<Coverage>
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coverage; /* Array of long offsets to mark set
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* coverage tables */
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};
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ASSERT_SIZE (MarkGlyphSetsFormat1, 4);
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struct MarkGlyphSets
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{
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inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
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{
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switch (u.format) {
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case 1: return u.format1->covers (set_index, glyph_id);
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default:return false;
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}
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}
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private:
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union {
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USHORT format; /* Format identifier */
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MarkGlyphSetsFormat1 format1[];
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} u;
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};
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ASSERT_SIZE (MarkGlyphSets, 2);
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/*
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* GDEF
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*/
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struct GDEF
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{
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static const hb_tag_t Tag = HB_TAG ('G','D','E','F');
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enum {
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UnclassifiedGlyph = 0,
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BaseGlyph = 1,
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LigatureGlyph = 2,
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MarkGlyph = 3,
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ComponentGlyph = 4,
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};
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STATIC_DEFINE_GET_FOR_DATA_CHECK_MAJOR_VERSION (GDEF, 1);
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inline bool has_glyph_classes () const { return glyphClassDef != 0; }
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inline hb_ot_layout_class_t get_glyph_class (hb_codepoint_t glyph) const
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{ return (this+glyphClassDef).get_class (glyph); }
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inline bool has_mark_attachment_types () const { return markAttachClassDef != 0; }
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inline hb_ot_layout_class_t get_mark_attachment_type (hb_codepoint_t glyph) const
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{ return (this+markAttachClassDef).get_class (glyph); }
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inline bool has_attach_points () const { return attachList != 0; }
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inline bool get_attach_points (hb_codepoint_t glyph_id,
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unsigned int *point_count /* IN/OUT */,
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unsigned int *point_array /* OUT */) const
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{ return (this+attachList).get_attach_points (glyph_id, point_count, point_array); }
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inline bool has_lig_carets () const { return ligCaretList != 0; }
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inline bool get_lig_carets (hb_ot_layout_context_t *context,
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hb_codepoint_t glyph_id,
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unsigned int *caret_count /* IN/OUT */,
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int *caret_array /* OUT */) const
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{ return (this+ligCaretList).get_lig_carets (context, glyph_id, caret_count, caret_array); }
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inline bool has_mark_sets () const { return version >= 0x00010002 && markGlyphSetsDef[0] != 0; }
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inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const
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{ return version >= 0x00010002 && (this+markGlyphSetsDef[0]).covers (set_index, glyph_id); }
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private:
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FixedVersion version; /* Version of the GDEF table--currently
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* 0x00010002 */
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OffsetTo<ClassDef>
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glyphClassDef; /* Offset to class definition table
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* for glyph type--from beginning of
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* GDEF header (may be Null) */
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OffsetTo<AttachList>
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attachList; /* Offset to list of glyphs with
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* attachment points--from beginning
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* of GDEF header (may be Null) */
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OffsetTo<LigCaretList>
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ligCaretList; /* Offset to list of positioning points
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* for ligature carets--from beginning
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* of GDEF header (may be Null) */
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OffsetTo<ClassDef>
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markAttachClassDef; /* Offset to class definition table for
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* mark attachment type--from beginning
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* of GDEF header (may be Null) */
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OffsetTo<MarkGlyphSets>
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markGlyphSetsDef[0]; /* Offset to the table of mark set
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* definitions--from beginning of GDEF
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* header (may be NULL). Introduced
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* in version 00010002. */
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};
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ASSERT_SIZE (GDEF, 12);
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#endif /* HB_OT_LAYOUT_GDEF_PRIVATE_HH */
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