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kc3-lang/harfbuzz/src/hb-ot-layout-gdef-table.hh
Behdad Esfahbod
- src/hb-ot-layout-gdef-table.hh
-
/* * Copyright © 2007,2008,2009 Red Hat, Inc. * Copyright © 2010,2011 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. * * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #ifndef HB_OT_LAYOUT_GDEF_TABLE_HH #define HB_OT_LAYOUT_GDEF_TABLE_HH #include "hb-ot-layout-common-private.hh" #include "hb-font-private.hh" /* * Attachment List Table */ typedef ArrayOf<USHORT> AttachPoint; /* Array of contour point indices--in * increasing numerical order */ struct AttachList { inline unsigned int get_attach_points (hb_codepoint_t glyph_id, unsigned int start_offset, unsigned int *point_count /* IN/OUT */, unsigned int *point_array /* OUT */) const { unsigned int index = (this+coverage) (glyph_id); if (index == NOT_COVERED) { if (point_count) *point_count = 0; return 0; } const AttachPoint &points = this+attachPoint[index]; if (point_count) { const USHORT *array = points.sub_array (start_offset, point_count); unsigned int count = *point_count; for (unsigned int i = 0; i < count; i++) point_array[i] = array[i]; } return points.len; } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return coverage.sanitize (c, this) && attachPoint.sanitize (c, this); } private: OffsetTo<Coverage> coverage; /* Offset to Coverage table -- from * beginning of AttachList table */ OffsetArrayOf<AttachPoint> attachPoint; /* Array of AttachPoint tables * in Coverage Index order */ public: DEFINE_SIZE_ARRAY (4, attachPoint); }; /* * Ligature Caret Table */ struct CaretValueFormat1 { friend struct CaretValue; private: inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id HB_UNUSED) const { return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_x (coordinate) : font->em_scale_y (coordinate); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return c->check_struct (this); } private: USHORT caretValueFormat; /* Format identifier--format = 1 */ SHORT coordinate; /* X or Y value, in design units */ public: DEFINE_SIZE_STATIC (4); }; struct CaretValueFormat2 { friend struct CaretValue; private: inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const { hb_position_t x, y; if (hb_font_get_glyph_contour_point_for_origin (font, glyph_id, caretValuePoint, direction, &x, &y)) return HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y; else return 0; } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return c->check_struct (this); } private: USHORT caretValueFormat; /* Format identifier--format = 2 */ USHORT caretValuePoint; /* Contour point index on glyph */ public: DEFINE_SIZE_STATIC (4); }; struct CaretValueFormat3 { friend struct CaretValue; inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id HB_UNUSED) const { return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font) : font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return c->check_struct (this) && deviceTable.sanitize (c, this); } private: USHORT caretValueFormat; /* Format identifier--format = 3 */ SHORT coordinate; /* X or Y value, in design units */ OffsetTo<Device> deviceTable; /* Offset to Device table for X or Y * value--from beginning of CaretValue * table */ public: DEFINE_SIZE_STATIC (6); }; struct CaretValue { inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const { switch (u.format) { case 1: return u.format1.get_caret_value (font, direction, glyph_id); case 2: return u.format2.get_caret_value (font, direction, glyph_id); case 3: return u.format3.get_caret_value (font, direction, glyph_id); default:return 0; } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!u.format.sanitize (c)) return false; switch (u.format) { case 1: return u.format1.sanitize (c); case 2: return u.format2.sanitize (c); case 3: return u.format3.sanitize (c); default:return true; } } private: union { USHORT format; /* Format identifier */ CaretValueFormat1 format1; CaretValueFormat2 format2; CaretValueFormat3 format3; } u; public: DEFINE_SIZE_UNION (2, format); }; struct LigGlyph { inline unsigned int get_lig_carets (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id, unsigned int start_offset, unsigned int *caret_count /* IN/OUT */, hb_position_t *caret_array /* OUT */) const { if (caret_count) { const OffsetTo<CaretValue> *array = carets.sub_array (start_offset, caret_count); unsigned int count = *caret_count; for (unsigned int i = 0; i < count; i++) caret_array[i] = (this+array[i]).get_caret_value (font, direction, glyph_id); } return carets.len; } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return carets.sanitize (c, this); } private: OffsetArrayOf<CaretValue> carets; /* Offset array of CaretValue tables * --from beginning of LigGlyph table * --in increasing coordinate order */ public: DEFINE_SIZE_ARRAY (2, carets); }; struct LigCaretList { inline unsigned int get_lig_carets (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id, unsigned int start_offset, unsigned int *caret_count /* IN/OUT */, hb_position_t *caret_array /* OUT */) const { unsigned int index = (this+coverage) (glyph_id); if (index == NOT_COVERED) { if (caret_count) *caret_count = 0; return 0; } const LigGlyph &lig_glyph = this+ligGlyph[index]; return lig_glyph.get_lig_carets (font, direction, glyph_id, start_offset, caret_count, caret_array); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return coverage.sanitize (c, this) && ligGlyph.sanitize (c, this); } private: OffsetTo<Coverage> coverage; /* Offset to Coverage table--from * beginning of LigCaretList table */ OffsetArrayOf<LigGlyph> ligGlyph; /* Array of LigGlyph tables * in Coverage Index order */ public: DEFINE_SIZE_ARRAY (4, ligGlyph); }; 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; } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return coverage.sanitize (c, this); } private: USHORT format; /* Format identifier--format = 1 */ LongOffsetArrayOf<Coverage> coverage; /* Array of long offsets to mark set * coverage tables */ public: DEFINE_SIZE_ARRAY (4, coverage); }; 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; } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!u.format.sanitize (c)) return false; switch (u.format) { case 1: return u.format1.sanitize (c); default:return true; } } private: union { USHORT format; /* Format identifier */ MarkGlyphSetsFormat1 format1; } u; public: DEFINE_SIZE_UNION (2, format); }; /* * GDEF -- The Glyph Definition Table */ struct GDEF { static const hb_tag_t Tag = HB_OT_TAG_GDEF; enum { UnclassifiedGlyph = 0, BaseGlyph = 1, LigatureGlyph = 2, MarkGlyph = 3, ComponentGlyph = 4 }; inline bool has_glyph_classes (void) const { return glyphClassDef != 0; } inline unsigned int get_glyph_class (hb_codepoint_t glyph) const { return (this+glyphClassDef).get_class (glyph); } inline bool has_mark_attachment_types (void) const { return markAttachClassDef != 0; } inline unsigned int get_mark_attachment_type (hb_codepoint_t glyph) const { return (this+markAttachClassDef).get_class (glyph); } inline bool has_attach_points (void) const { return attachList != 0; } inline unsigned int get_attach_points (hb_codepoint_t glyph_id, unsigned int start_offset, unsigned int *point_count /* IN/OUT */, unsigned int *point_array /* OUT */) const { return (this+attachList).get_attach_points (glyph_id, start_offset, point_count, point_array); } inline bool has_lig_carets (void) const { return ligCaretList != 0; } inline unsigned int get_lig_carets (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id, unsigned int start_offset, unsigned int *caret_count /* IN/OUT */, hb_position_t *caret_array /* OUT */) const { return (this+ligCaretList).get_lig_carets (font, direction, glyph_id, start_offset, caret_count, caret_array); } inline bool has_mark_sets (void) const { return version.to_int () >= 0x00010002 && markGlyphSetsDef[0] != 0; } inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const { return version.to_int () >= 0x00010002 && (this+markGlyphSetsDef[0]).covers (set_index, glyph_id); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return version.sanitize (c) && likely (version.major == 1) && glyphClassDef.sanitize (c, this) && attachList.sanitize (c, this) && ligCaretList.sanitize (c, this) && markAttachClassDef.sanitize (c, this) && (version.to_int () < 0x00010002 || markGlyphSetsDef[0].sanitize (c, this)); } /* glyph_props is a 16-bit integer where the lower 8-bit have bits representing * glyph class and other bits, and high 8-bit gthe mark attachment type (if any). * Not to be confused with lookup_props which is very similar. */ inline unsigned int get_glyph_props (hb_codepoint_t glyph) const { unsigned int klass = get_glyph_class (glyph); switch (klass) { default: case UnclassifiedGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED; case BaseGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH; case LigatureGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE; case ComponentGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT; case MarkGlyph: klass = get_mark_attachment_type (glyph); return HB_OT_LAYOUT_GLYPH_CLASS_MARK | (klass << 8); } } private: FixedVersion version; /* Version of the GDEF table--currently * 0x00010002 */ OffsetTo<ClassDef> glyphClassDef; /* Offset to class definition table * for glyph type--from beginning of * GDEF header (may be Null) */ OffsetTo<AttachList> attachList; /* Offset to list of glyphs with * attachment points--from beginning * of GDEF header (may be Null) */ OffsetTo<LigCaretList> ligCaretList; /* Offset to list of positioning points * for ligature carets--from beginning * of GDEF header (may be Null) */ OffsetTo<ClassDef> markAttachClassDef; /* Offset to class definition table for * mark attachment type--from beginning * of GDEF header (may be Null) */ OffsetTo<MarkGlyphSets> markGlyphSetsDef[VAR]; /* Offset to the table of mark set * definitions--from beginning of GDEF * header (may be NULL). Introduced * in version 00010002. */ public: DEFINE_SIZE_ARRAY (12, markGlyphSetsDef); }; #endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */