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