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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh b/gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh new file mode 100644 index 000000000..b70cbb7a3 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh @@ -0,0 +1,459 @@ +/* + * Copyright © 2007,2008,2009 Red Hat, Inc. + * Copyright © 2010,2011,2012 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" + + +namespace OT { + + +/* + * 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).get_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) const + { + TRACE_SANITIZE (this); + return_trace (coverage.sanitize (c, this) && attachPoint.sanitize (c, this)); + } + + protected: + 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) 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) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + protected: + 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 (font->get_glyph_contour_point_for_origin (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) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + protected: + 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, const VariationStore &var_store) const + { + return HB_DIRECTION_IS_HORIZONTAL (direction) ? + font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font, var_store) : + font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font, var_store); + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && deviceTable.sanitize (c, this)); + } + + protected: + 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 VariationStore &var_store) const + { + switch (u.format) { + case 1: return u.format1.get_caret_value (font, direction); + case 2: return u.format2.get_caret_value (font, direction, glyph_id); + case 3: return u.format3.get_caret_value (font, direction, var_store); + default:return 0; + } + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (!u.format.sanitize (c)) return_trace (false); + switch (u.format) { + case 1: return_trace (u.format1.sanitize (c)); + case 2: return_trace (u.format2.sanitize (c)); + case 3: return_trace (u.format3.sanitize (c)); + default:return_trace (true); + } + } + + protected: + 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, + const VariationStore &var_store, + 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, var_store); + } + + return carets.len; + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (carets.sanitize (c, this)); + } + + protected: + 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, + const VariationStore &var_store, + unsigned int start_offset, + unsigned int *caret_count /* IN/OUT */, + hb_position_t *caret_array /* OUT */) const + { + unsigned int index = (this+coverage).get_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, var_store, start_offset, caret_count, caret_array); + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this)); + } + + protected: + 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) const + { + TRACE_SANITIZE (this); + return_trace (coverage.sanitize (c, this)); + } + + protected: + USHORT format; /* Format identifier--format = 1 */ + ArrayOf<OffsetTo<Coverage, ULONG> > + 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) const + { + TRACE_SANITIZE (this); + if (!u.format.sanitize (c)) return_trace (false); + switch (u.format) { + case 1: return_trace (u.format1.sanitize (c)); + default:return_trace (true); + } + } + + protected: + 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 tableTag = HB_OT_TAG_GDEF; + + enum GlyphClasses { + 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 void get_glyphs_in_class (unsigned int klass, hb_set_t *glyphs) const + { (this+glyphClassDef).add_class (glyphs, klass); } + + 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, get_var_store(), + start_offset, caret_count, caret_array); } + + inline bool has_mark_sets (void) const { return version.to_int () >= 0x00010002u && markGlyphSetsDef != 0; } + inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const + { return version.to_int () >= 0x00010002u && (this+markGlyphSetsDef).covers (set_index, glyph_id); } + + inline bool has_var_store (void) const { return version.to_int () >= 0x00010003u && varStore != 0; } + inline const VariationStore &get_var_store (void) const + { return version.to_int () >= 0x00010003u ? this+varStore : Null(VariationStore); } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (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 () < 0x00010002u || markGlyphSetsDef.sanitize (c, this)) && + (version.to_int () < 0x00010003u || varStore.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); + + ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH == (unsigned int) LookupFlag::IgnoreBaseGlyphs); + ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE == (unsigned int) LookupFlag::IgnoreLigatures); + ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_MARK == (unsigned int) LookupFlag::IgnoreMarks); + + switch (klass) { + default: return 0; + case BaseGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH; + case LigatureGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE; + case MarkGlyph: + klass = get_mark_attachment_type (glyph); + return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8); + } + } + + + protected: + FixedVersion<>version; /* Version of the GDEF table--currently + * 0x00010003u */ + 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; /* Offset to the table of mark set + * definitions--from beginning of GDEF + * header (may be NULL). Introduced + * in version 0x00010002. */ + OffsetTo<VariationStore, ULONG> + varStore; /* Offset to the table of Item Variation + * Store--from beginning of GDEF + * header (may be NULL). Introduced + * in version 0x00010003. */ + public: + DEFINE_SIZE_MIN (12); +}; + + +} /* namespace OT */ + + +#endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */ |