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

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/*
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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, a text shaping library.
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*
* 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
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#include "hb-ot-layout-common-private.hh"
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#include "hb-font-private.h"
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HB_BEGIN_DECLS
/*
* Attachment List Table
*/
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typedef ArrayOf<USHORT> AttachPoint; /* Array of contour point indices--in
* increasing numerical order */
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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
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{
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unsigned int index = (this+coverage) (glyph_id);
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if (index == NOT_COVERED)
{
if (point_count)
*point_count = 0;
return 0;
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}
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const AttachPoint &points = this+attachPoint[index];
if (point_count) {
const USHORT *array = points.sub_array (start_offset, point_count);
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unsigned int count = *point_count;
for (unsigned int i = 0; i < count; i++)
point_array[i] = array[i];
}
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return points.len;
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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return coverage.sanitize (c, this)
&& attachPoint.sanitize (c, this);
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}
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private:
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OffsetTo<Coverage>
coverage; /* Offset to Coverage table -- from
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* beginning of AttachList table */
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OffsetArrayOf<AttachPoint>
attachPoint; /* Array of AttachPoint tables
* in Coverage Index order */
public:
DEFINE_SIZE_ARRAY (4, attachPoint);
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};
/*
* Ligature Caret Table
*/
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struct CaretValueFormat1
{
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friend struct CaretValue;
private:
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inline int get_caret_value (hb_ot_layout_context_t *c, hb_codepoint_t glyph_id HB_UNUSED) const
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{
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/* TODO vertical */
return c->scale_x (coordinate);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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return c->check_struct (this);
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}
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private:
USHORT caretValueFormat; /* Format identifier--format = 1 */
SHORT coordinate; /* X or Y value, in design units */
public:
DEFINE_SIZE_STATIC (4);
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};
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struct CaretValueFormat2
{
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friend struct CaretValue;
private:
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inline int get_caret_value (hb_ot_layout_context_t *c, hb_codepoint_t glyph_id) const
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{
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/* TODO vertical */
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hb_position_t x, y;
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if (hb_font_get_contour_point (c->font, c->face, caretValuePoint, glyph_id, &x, &y))
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return x;
else
return 0;
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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return c->check_struct (this);
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}
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private:
USHORT caretValueFormat; /* Format identifier--format = 2 */
USHORT caretValuePoint; /* Contour point index on glyph */
public:
DEFINE_SIZE_STATIC (4);
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};
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struct CaretValueFormat3
{
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friend struct CaretValue;
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inline int get_caret_value (hb_ot_layout_context_t *c, hb_codepoint_t glyph_id HB_UNUSED) const
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{
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/* TODO vertical */
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return c->scale_x (coordinate) + ((this+deviceTable).get_x_delta (c));
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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return c->check_struct (this)
&& deviceTable.sanitize (c, this);
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}
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private:
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USHORT caretValueFormat; /* Format identifier--format = 3 */
SHORT coordinate; /* X or Y value, in design units */
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OffsetTo<Device>
deviceTable; /* Offset to Device table for X or Y
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* value--from beginning of CaretValue
* table */
public:
DEFINE_SIZE_STATIC (6);
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};
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struct CaretValue
{
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inline int get_caret_value (hb_ot_layout_context_t *c, hb_codepoint_t glyph_id) const
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{
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switch (u.format) {
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case 1: return u.format1.get_caret_value (c, glyph_id);
case 2: return u.format2.get_caret_value (c, glyph_id);
case 3: return u.format3.get_caret_value (c, glyph_id);
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default:return 0;
}
}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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if (!u.format.sanitize (c)) return false;
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switch (u.format) {
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case 1: return u.format1.sanitize (c);
case 2: return u.format2.sanitize (c);
case 3: return u.format3.sanitize (c);
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default:return true;
}
}
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private:
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union {
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USHORT format; /* Format identifier */
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CaretValueFormat1 format1;
CaretValueFormat2 format2;
CaretValueFormat3 format3;
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} u;
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public:
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DEFINE_SIZE_UNION (2, format);
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};
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struct LigGlyph
{
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inline unsigned int get_lig_carets (hb_ot_layout_context_t *c,
hb_codepoint_t glyph_id,
unsigned int start_offset,
unsigned int *caret_count /* IN/OUT */,
int *caret_array /* OUT */) const
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{
if (caret_count) {
const OffsetTo<CaretValue> *array = carets.sub_array (start_offset, caret_count);
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unsigned int count = *caret_count;
for (unsigned int i = 0; i < count; i++)
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caret_array[i] = (this+array[i]).get_caret_value (c, glyph_id);
}
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return carets.len;
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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return carets.sanitize (c, this);
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}
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private:
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OffsetArrayOf<CaretValue>
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carets; /* Offset array of CaretValue tables
* --from beginning of LigGlyph table
* --in increasing coordinate order */
public:
DEFINE_SIZE_ARRAY (2, carets);
};
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struct LigCaretList
{
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inline unsigned int get_lig_carets (hb_ot_layout_context_t *c,
hb_codepoint_t glyph_id,
unsigned int start_offset,
unsigned int *caret_count /* IN/OUT */,
int *caret_array /* OUT */) const
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{
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unsigned int index = (this+coverage) (glyph_id);
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if (index == NOT_COVERED)
{
if (caret_count)
*caret_count = 0;
return 0;
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}
const LigGlyph &lig_glyph = this+ligGlyph[index];
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return lig_glyph.get_lig_carets (c, glyph_id, start_offset, caret_count, caret_array);
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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return coverage.sanitize (c, this)
&& ligGlyph.sanitize (c, this);
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}
private:
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OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of LigCaretList table */
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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; }
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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return coverage.sanitize (c, this);
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}
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) {
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case 1: return u.format1.covers (set_index, glyph_id);
default:return false;
}
}
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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if (!u.format.sanitize (c)) return false;
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switch (u.format) {
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case 1: return u.format1.sanitize (c);
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default:return true;
}
}
private:
union {
USHORT format; /* Format identifier */
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MarkGlyphSetsFormat1 format1;
} u;
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public:
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DEFINE_SIZE_UNION (2, format);
};
/*
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* GDEF
*/
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struct GDEF
{
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static const hb_tag_t Tag = HB_OT_TAG_GDEF;
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enum {
UnclassifiedGlyph = 0,
BaseGlyph = 1,
LigatureGlyph = 2,
MarkGlyph = 3,
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ComponentGlyph = 4
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};
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inline bool has_glyph_classes (void) const { return glyphClassDef != 0; }
inline hb_ot_layout_class_t get_glyph_class (hb_codepoint_t glyph) const
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{ return (this+glyphClassDef).get_class (glyph); }
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inline bool has_mark_attachment_types (void) const { return markAttachClassDef != 0; }
inline hb_ot_layout_class_t get_mark_attachment_type (hb_codepoint_t glyph) const
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{ return (this+markAttachClassDef).get_class (glyph); }
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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); }
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inline bool has_lig_carets (void) const { return ligCaretList != 0; }
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inline unsigned int get_lig_carets (hb_ot_layout_context_t *c,
hb_codepoint_t glyph_id,
unsigned int start_offset,
unsigned int *caret_count /* IN/OUT */,
int *caret_array /* OUT */) const
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{ return (this+ligCaretList).get_lig_carets (c, glyph_id, start_offset, caret_count, caret_array); }
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inline bool has_mark_sets (void) 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); }
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inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
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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 < 0x00010002 || markGlyphSetsDef[0].sanitize (c, this));
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}
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private:
FixedVersion version; /* Version of the GDEF table--currently
* 0x00010002 */
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OffsetTo<ClassDef>
glyphClassDef; /* Offset to class definition table
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* for glyph type--from beginning of
* GDEF header (may be Null) */
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OffsetTo<AttachList>
attachList; /* Offset to list of glyphs with
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* attachment points--from beginning
* of GDEF header (may be Null) */
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OffsetTo<LigCaretList>
ligCaretList; /* Offset to list of positioning points
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* for ligature carets--from beginning
* of GDEF header (may be Null) */
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OffsetTo<ClassDef>
markAttachClassDef; /* Offset to class definition table for
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* 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. */
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public:
DEFINE_SIZE_ARRAY (12, markGlyphSetsDef);
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};
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HB_END_DECLS
#endif /* HB_OT_LAYOUT_GDEF_PRIVATE_HH */