harfbuzz/src/hb-ot-layout-gdef-private.hh

323 lines
9.1 KiB
C++

/*
* 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_HH
#define HB_OT_LAYOUT_GDEF_PRIVATE_HH
#include "hb-ot-layout-common-private.hh"
#include "hb-font-private.h"
struct GlyphClassDef : ClassDef
{
enum {
BaseGlyph = 0x0001u,
LigatureGlyph = 0x0002u,
MarkGlyph = 0x0003u,
ComponentGlyph = 0x0004u,
};
};
/*
* Attachment List Table
*/
typedef ArrayOf<USHORT> 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>
coverage; /* Offset to Coverage table -- from
* beginning of AttachList table */
OffsetArrayOf<AttachPoint>
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<Device>
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<CaretValue>
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>
coverage; /* Offset to Coverage table--from
* beginning of LigCaretList table */
OffsetArrayOf<LigGlyph>
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>
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, 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<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[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_HH */