232 lines
6.6 KiB
C++
232 lines
6.6 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_H
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#define HB_OT_LAYOUT_GDEF_PRIVATE_H
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#include "hb-ot-layout-common-private.h"
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#define DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP(Type, array, name) \
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inline const Type& name (hb_codepoint_t glyph) { \
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return this+array[(this+coverage)(glyph)]; \
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}
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struct GlyphClassDef : ClassDef {
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static const unsigned int BaseGlyph = 0x0001u;
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static const unsigned int LigatureGlyph = 0x0002u;
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static const unsigned int MarkGlyph = 0x0003u;
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static const unsigned int ComponentGlyph = 0x0004u;
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};
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/*
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* Attachment List Table
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*/
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struct AttachPoint {
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ArrayOf<USHORT>
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pointIndex; /* Array of contour point indices--in
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* increasing numerical order */
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};
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ASSERT_SIZE (AttachPoint, 2);
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struct AttachList {
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/* const AttachPoint& get_attach_points (hb_codepoint_t glyph); */
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DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP (AttachPoint, attachPoint, get_attach_points);
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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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friend struct CaretValue;
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private:
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inline int get_caret_value (int ppem) const {
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return /* TODO garbage */ coordinate / ppem;
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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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friend struct CaretValue;
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private:
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inline int get_caret_value (int ppem) const {
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return /* TODO garbage */ 0 / ppem;
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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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friend struct CaretValue;
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private:
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inline const Device& get_device (void) const {
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if (HB_UNLIKELY (!deviceTable)) return Null(Device);
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return (const Device&)*((const char*)this + deviceTable);
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}
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inline int get_caret_value (int ppem) const {
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return /* TODO garbage */ (coordinate + get_device().get_delta (ppem)) / ppem;
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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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Offset 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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/* XXX we need access to a load-contour-point vfunc here */
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int get_caret_value (int ppem) const {
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switch (u.format) {
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case 1: return u.format1->get_caret_value(ppem);
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case 2: return u.format2->get_caret_value(ppem);
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case 3: return u.format3->get_caret_value(ppem);
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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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friend struct LigCaretList;
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OffsetArrayOf<CaretValue>
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caret; /* Array of CaretValue tables
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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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friend struct GDEF;
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private:
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/* const LigGlyph& get_lig_glyph (hb_codepoint_t glyph); */
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DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP (LigGlyph, ligGlyph, get_lig_glyph);
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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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/*
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* GDEF
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*/
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struct GDEF {
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static const hb_tag_t Tag = HB_TAG ('G','D','E','F');
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static const hb_ot_layout_class_t UnclassifiedGlyph = 0;
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static const hb_ot_layout_class_t BaseGlyph = 1;
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static const hb_ot_layout_class_t LigatureGlyph = 2;
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static const hb_ot_layout_class_t MarkGlyph = 3;
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static const hb_ot_layout_class_t ComponentGlyph = 4;
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STATIC_DEFINE_GET_FOR_DATA (GDEF);
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/* XXX check version here? */
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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 glyphClassDef(this).get_class (glyph);
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}
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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 markAttachClassDef(this).get_class (glyph);
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}
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/* TODO get_attach and get_lig_caret */
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inline bool has_attach_list () const { return attachList != 0; }
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inline bool has_lig_caret_list () const { return ligCaretList != 0; }
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private:
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Fixed version; /* Version of the GDEF table--initially
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* 0x00010000 */
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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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};
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ASSERT_SIZE (GDEF, 12);
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#endif /* HB_OT_LAYOUT_GDEF_PRIVATE_H */
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