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/*
* Copyright © 2007,2008,2009,2010 Red Hat, Inc.
* Copyright © 2010,2012 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_GSUB_TABLE_HH
#define HB_OT_LAYOUT_GSUB_TABLE_HH
#include "hb-ot-layout-gsubgpos-private.hh"
namespace OT {
struct SingleSubstFormat1
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
hb_codepoint_t glyph_id = iter.get_glyph ();
if (c->glyphs->has (glyph_id))
c->glyphs->add ((glyph_id + deltaGlyphID) & 0xFFFF);
}
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
hb_codepoint_t glyph_id = iter.get_glyph ();
c->input->add (glyph_id);
c->output->add ((glyph_id + deltaGlyphID) & 0xFFFF);
}
}
inline const Coverage &get_coverage (void) const
{
return this+coverage;
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
unsigned int index = (this+coverage).get_coverage (glyph_id);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
/* According to the Adobe Annotated OpenType Suite, result is always
* limited to 16bit. */
glyph_id = (glyph_id + deltaGlyphID) & 0xFFFF;
c->replace_glyph (glyph_id);
return TRACE_RETURN (true);
}
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
unsigned int num_glyphs,
int delta)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false);
deltaGlyphID.set (delta); /* TODO(serilaize) overflow? */
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (coverage.sanitize (c, this) && deltaGlyphID.sanitize (c));
}
protected:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of Substitution table */
SHORT deltaGlyphID; /* Add to original GlyphID to get
* substitute GlyphID */
public:
DEFINE_SIZE_STATIC (6);
};
struct SingleSubstFormat2
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
if (c->glyphs->has (iter.get_glyph ()))
c->glyphs->add (substitute[iter.get_coverage ()]);
}
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
c->input->add (iter.get_glyph ());
c->output->add (substitute[iter.get_coverage ()]);
}
}
inline const Coverage &get_coverage (void) const
{
return this+coverage;
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
unsigned int index = (this+coverage).get_coverage (glyph_id);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
if (unlikely (index >= substitute.len)) return TRACE_RETURN (false);
glyph_id = substitute[index];
c->replace_glyph (glyph_id);
return TRACE_RETURN (true);
}
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
Supplier<GlyphID> &substitutes,
unsigned int num_glyphs)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
if (unlikely (!substitute.serialize (c, substitutes, num_glyphs))) return TRACE_RETURN (false);
if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (coverage.sanitize (c, this) && substitute.sanitize (c));
}
protected:
USHORT format; /* Format identifier--format = 2 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of Substitution table */
ArrayOf<GlyphID>
substitute; /* Array of substitute
* GlyphIDs--ordered by Coverage Index */
public:
DEFINE_SIZE_ARRAY (6, substitute);
};
struct SingleSubst
{
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
Supplier<GlyphID> &substitutes,
unsigned int num_glyphs)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false);
unsigned int format = 2;
int delta;
if (num_glyphs) {
format = 1;
/* TODO(serialize) check for wrap-around */
delta = substitutes[0] - glyphs[0];
for (unsigned int i = 1; i < num_glyphs; i++)
if (delta != substitutes[i] - glyphs[i]) {
format = 2;
break;
}
}
u.format.set (format);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.serialize (c, glyphs, num_glyphs, delta));
case 2: return TRACE_RETURN (u.format2.serialize (c, glyphs, substitutes, num_glyphs));
default:return TRACE_RETURN (false);
}
}
template <typename context_t>
inline typename context_t::return_t dispatch (context_t *c) const
{
TRACE_DISPATCH (this);
switch (u.format) {
case 1: return TRACE_RETURN (c->dispatch (u.format1));
case 2: return TRACE_RETURN (c->dispatch (u.format2));
default:return TRACE_RETURN (c->default_return_value ());
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
case 2: return TRACE_RETURN (u.format2.sanitize (c));
default:return TRACE_RETURN (true);
}
}
protected:
union {
USHORT format; /* Format identifier */
SingleSubstFormat1 format1;
SingleSubstFormat2 format2;
} u;
};
struct Sequence
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
/* For len==0 we don't do anything, so it's harmless. */
return TRACE_RETURN (substitute.len <= 1);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
unsigned int count = substitute.len;
for (unsigned int i = 0; i < count; i++)
c->glyphs->add (substitute[i]);
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
unsigned int count = substitute.len;
for (unsigned int i = 0; i < count; i++)
c->output->add (substitute[i]);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
if (unlikely (!substitute.len)) return TRACE_RETURN (false);
unsigned int klass = c->buffer->cur().glyph_props() &
HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE ? HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH : 0;
unsigned int count = substitute.len;
if (count == 1) /* Special-case to make it in-place. */
{
c->replace_glyph (substitute.array[0]);
}
else
{
for (unsigned int i = 0; i < count; i++) {
set_lig_props_for_component (c->buffer->cur(), i);
c->output_glyph (substitute.array[i], klass);
}
c->buffer->skip_glyph ();
}
return TRACE_RETURN (true);
}
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
unsigned int num_glyphs)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
if (unlikely (!substitute.serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (substitute.sanitize (c));
}
protected:
ArrayOf<GlyphID>
substitute; /* String of GlyphIDs to substitute */
public:
DEFINE_SIZE_ARRAY (2, substitute);
};
struct MultipleSubstFormat1
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
/* Some tools generate MultipleSubst with each substitute having length 1!
* So, check them. */
unsigned int count = sequence.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+sequence[i]).is_inplace (c))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
if (c->glyphs->has (iter.get_glyph ()))
(this+sequence[iter.get_coverage ()]).closure (c);
}
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
(this+coverage).add_coverage (c->input);
unsigned int count = sequence.len;
for (unsigned int i = 0; i < count; i++)
(this+sequence[i]).collect_glyphs (c);
}
inline const Coverage &get_coverage (void) const
{
return this+coverage;
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
return TRACE_RETURN ((this+sequence[index]).apply (c));
}
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
Supplier<unsigned int> &substitute_len_list,
unsigned int num_glyphs,
Supplier<GlyphID> &substitute_glyphs_list)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
if (unlikely (!sequence.serialize (c, num_glyphs))) return TRACE_RETURN (false);
for (unsigned int i = 0; i < num_glyphs; i++)
if (unlikely (!sequence[i].serialize (c, this).serialize (c,
substitute_glyphs_list,
substitute_len_list[i]))) return TRACE_RETURN (false);
substitute_len_list.advance (num_glyphs);
if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (coverage.sanitize (c, this) && sequence.sanitize (c, this));
}
protected:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of Substitution table */
OffsetArrayOf<Sequence>
sequence; /* Array of Sequence tables
* ordered by Coverage Index */
public:
DEFINE_SIZE_ARRAY (6, sequence);
};
struct MultipleSubst
{
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
Supplier<unsigned int> &substitute_len_list,
unsigned int num_glyphs,
Supplier<GlyphID> &substitute_glyphs_list)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false);
unsigned int format = 1;
u.format.set (format);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.serialize (c, glyphs, substitute_len_list, num_glyphs, substitute_glyphs_list));
default:return TRACE_RETURN (false);
}
}
template <typename context_t>
inline typename context_t::return_t dispatch (context_t *c) const
{
TRACE_DISPATCH (this);
switch (u.format) {
case 1: return TRACE_RETURN (c->dispatch (u.format1));
default:return TRACE_RETURN (c->default_return_value ());
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
protected:
union {
USHORT format; /* Format identifier */
MultipleSubstFormat1 format1;
} u;
};
typedef ArrayOf<GlyphID> AlternateSet; /* Array of alternate GlyphIDs--in
* arbitrary order */
struct AlternateSubstFormat1
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
if (c->glyphs->has (iter.get_glyph ())) {
const AlternateSet &alt_set = this+alternateSet[iter.get_coverage ()];
unsigned int count = alt_set.len;
for (unsigned int i = 0; i < count; i++)
c->glyphs->add (alt_set[i]);
}
}
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
c->input->add (iter.get_glyph ());
const AlternateSet &alt_set = this+alternateSet[iter.get_coverage ()];
unsigned int count = alt_set.len;
for (unsigned int i = 0; i < count; i++)
c->output->add (alt_set[i]);
}
}
inline const Coverage &get_coverage (void) const
{
return this+coverage;
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
unsigned int index = (this+coverage).get_coverage (glyph_id);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
const AlternateSet &alt_set = this+alternateSet[index];
if (unlikely (!alt_set.len)) return TRACE_RETURN (false);
hb_mask_t glyph_mask = c->buffer->cur().mask;
hb_mask_t lookup_mask = c->lookup_mask;
/* Note: This breaks badly if two features enabled this lookup together. */
unsigned int shift = _hb_ctz (lookup_mask);
unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift);
if (unlikely (alt_index > alt_set.len || alt_index == 0)) return TRACE_RETURN (false);
glyph_id = alt_set[alt_index - 1];
c->replace_glyph (glyph_id);
return TRACE_RETURN (true);
}
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
Supplier<unsigned int> &alternate_len_list,
unsigned int num_glyphs,
Supplier<GlyphID> &alternate_glyphs_list)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
if (unlikely (!alternateSet.serialize (c, num_glyphs))) return TRACE_RETURN (false);
for (unsigned int i = 0; i < num_glyphs; i++)
if (unlikely (!alternateSet[i].serialize (c, this).serialize (c,
alternate_glyphs_list,
alternate_len_list[i]))) return TRACE_RETURN (false);
alternate_len_list.advance (num_glyphs);
if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (coverage.sanitize (c, this) && alternateSet.sanitize (c, this));
}
protected:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of Substitution table */
OffsetArrayOf<AlternateSet>
alternateSet; /* Array of AlternateSet tables
* ordered by Coverage Index */
public:
DEFINE_SIZE_ARRAY (6, alternateSet);
};
struct AlternateSubst
{
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &glyphs,
Supplier<unsigned int> &alternate_len_list,
unsigned int num_glyphs,
Supplier<GlyphID> &alternate_glyphs_list)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false);
unsigned int format = 1;
u.format.set (format);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.serialize (c, glyphs, alternate_len_list, num_glyphs, alternate_glyphs_list));
default:return TRACE_RETURN (false);
}
}
template <typename context_t>
inline typename context_t::return_t dispatch (context_t *c) const
{
TRACE_DISPATCH (this);
switch (u.format) {
case 1: return TRACE_RETURN (c->dispatch (u.format1));
default:return TRACE_RETURN (c->default_return_value ());
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
protected:
union {
USHORT format; /* Format identifier */
AlternateSubstFormat1 format1;
} u;
};
struct Ligature
{
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
unsigned int count = component.len;
for (unsigned int i = 1; i < count; i++)
if (!c->glyphs->has (component[i]))
return;
c->glyphs->add (ligGlyph);
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
unsigned int count = component.len;
for (unsigned int i = 1; i < count; i++)
c->input->add (component[i]);
c->output->add (ligGlyph);
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
if (c->len != component.len)
return TRACE_RETURN (false);
for (unsigned int i = 1; i < c->len; i++)
if (likely (c->glyphs[i] != component[i]))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
unsigned int count = component.len;
if (unlikely (count < 1)) return TRACE_RETURN (false);
unsigned int end_offset = 0;
bool is_mark_ligature = false;
unsigned int total_component_count = 0;
if (likely (!match_input (c, count,
&component[1],
match_glyph,
NULL,
&end_offset,
&is_mark_ligature,
&total_component_count)))
return TRACE_RETURN (false);
/* Deal, we are forming the ligature. */
c->buffer->merge_clusters (c->buffer->idx, c->buffer->idx + end_offset);
ligate_input (c,
count,
&component[1],
match_glyph,
NULL,
ligGlyph,
is_mark_ligature,
total_component_count);
return TRACE_RETURN (true);
}
inline bool serialize (hb_serialize_context_t *c,
GlyphID ligature,
Supplier<GlyphID> &components, /* Starting from second */
unsigned int num_components /* Including first component */)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
ligGlyph = ligature;
if (unlikely (!component.serialize (c, components, num_components))) return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
public:
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (ligGlyph.sanitize (c) && component.sanitize (c));
}
protected:
GlyphID ligGlyph; /* GlyphID of ligature to substitute */
HeadlessArrayOf<GlyphID>
component; /* Array of component GlyphIDs--start
* with the second component--ordered
* in writing direction */
public:
DEFINE_SIZE_ARRAY (4, component);
};
struct LigatureSet
{
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
unsigned int num_ligs = ligature.len;
for (unsigned int i = 0; i < num_ligs; i++)
(this+ligature[i]).closure (c);
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
unsigned int num_ligs = ligature.len;
for (unsigned int i = 0; i < num_ligs; i++)
(this+ligature[i]).collect_glyphs (c);
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
unsigned int num_ligs = ligature.len;
for (unsigned int i = 0; i < num_ligs; i++)
{
const Ligature &lig = this+ligature[i];
if (lig.would_apply (c))
return TRACE_RETURN (true);
}
return TRACE_RETURN (false);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
unsigned int num_ligs = ligature.len;
for (unsigned int i = 0; i < num_ligs; i++)
{
const Ligature &lig = this+ligature[i];
if (lig.apply (c)) return TRACE_RETURN (true);
}
return TRACE_RETURN (false);
}
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &ligatures,
Supplier<unsigned int> &component_count_list,
unsigned int num_ligatures,
Supplier<GlyphID> &component_list /* Starting from second for each ligature */)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
if (unlikely (!ligature.serialize (c, num_ligatures))) return TRACE_RETURN (false);
for (unsigned int i = 0; i < num_ligatures; i++)
if (unlikely (!ligature[i].serialize (c, this).serialize (c,
ligatures[i],
component_list,
component_count_list[i]))) return TRACE_RETURN (false);
ligatures.advance (num_ligatures);
component_count_list.advance (num_ligatures);
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (ligature.sanitize (c, this));
}
protected:
OffsetArrayOf<Ligature>
ligature; /* Array LigatureSet tables
* ordered by preference */
public:
DEFINE_SIZE_ARRAY (2, ligature);
};
struct LigatureSubstFormat1
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
return TRACE_RETURN (false);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
if (c->glyphs->has (iter.get_glyph ()))
(this+ligatureSet[iter.get_coverage ()]).closure (c);
}
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
c->input->add (iter.get_glyph ());
(this+ligatureSet[iter.get_coverage ()]).collect_glyphs (c);
}
}
inline const Coverage &get_coverage (void) const
{
return this+coverage;
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
unsigned int index = (this+coverage).get_coverage (c->glyphs[0]);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
const LigatureSet &lig_set = this+ligatureSet[index];
return TRACE_RETURN (lig_set.would_apply (c));
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
unsigned int index = (this+coverage).get_coverage (glyph_id);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
const LigatureSet &lig_set = this+ligatureSet[index];
return TRACE_RETURN (lig_set.apply (c));
}
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &first_glyphs,
Supplier<unsigned int> &ligature_per_first_glyph_count_list,
unsigned int num_first_glyphs,
Supplier<GlyphID> &ligatures_list,
Supplier<unsigned int> &component_count_list,
Supplier<GlyphID> &component_list /* Starting from second for each ligature */)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false);
if (unlikely (!ligatureSet.serialize (c, num_first_glyphs))) return TRACE_RETURN (false);
for (unsigned int i = 0; i < num_first_glyphs; i++)
if (unlikely (!ligatureSet[i].serialize (c, this).serialize (c,
ligatures_list,
component_count_list,
ligature_per_first_glyph_count_list[i],
component_list))) return TRACE_RETURN (false);
ligature_per_first_glyph_count_list.advance (num_first_glyphs);
if (unlikely (!coverage.serialize (c, this).serialize (c, first_glyphs, num_first_glyphs))) return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (coverage.sanitize (c, this) && ligatureSet.sanitize (c, this));
}
protected:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of Substitution table */
OffsetArrayOf<LigatureSet>
ligatureSet; /* Array LigatureSet tables
* ordered by Coverage Index */
public:
DEFINE_SIZE_ARRAY (6, ligatureSet);
};
struct LigatureSubst
{
inline bool serialize (hb_serialize_context_t *c,
Supplier<GlyphID> &first_glyphs,
Supplier<unsigned int> &ligature_per_first_glyph_count_list,
unsigned int num_first_glyphs,
Supplier<GlyphID> &ligatures_list,
Supplier<unsigned int> &component_count_list,
Supplier<GlyphID> &component_list /* Starting from second for each ligature */)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false);
unsigned int format = 1;
u.format.set (format);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.serialize (c, first_glyphs, ligature_per_first_glyph_count_list, num_first_glyphs,
ligatures_list, component_count_list, component_list));
default:return TRACE_RETURN (false);
}
}
template <typename context_t>
inline typename context_t::return_t dispatch (context_t *c) const
{
TRACE_DISPATCH (this);
switch (u.format) {
case 1: return TRACE_RETURN (c->dispatch (u.format1));
default:return TRACE_RETURN (c->default_return_value ());
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
protected:
union {
USHORT format; /* Format identifier */
LigatureSubstFormat1 format1;
} u;
};
struct ContextSubst : Context {};
struct ChainContextSubst : ChainContext {};
struct ExtensionSubst : Extension<ExtensionSubst>
{
typedef struct SubstLookupSubTable LookupSubTable;
inline bool is_reverse (void) const;
};
struct ReverseChainSingleSubstFormat1
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
unsigned int count;
count = backtrack.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+backtrack[i]).intersects (c->glyphs))
return;
count = lookahead.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+lookahead[i]).intersects (c->glyphs))
return;
const ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead);
Coverage::Iter iter;
for (iter.init (this+coverage); iter.more (); iter.next ()) {
if (c->glyphs->has (iter.get_glyph ()))
c->glyphs->add (substitute[iter.get_coverage ()]);
}
}
inline void collect_glyphs (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
unsigned int count;
(this+coverage).add_coverage (c->input);
count = backtrack.len;
for (unsigned int i = 0; i < count; i++)
(this+backtrack[i]).add_coverage (c->before);
count = lookahead.len;
for (unsigned int i = 0; i < count; i++)
(this+lookahead[i]).add_coverage (c->after);
const ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead);
count = substitute.len;
for (unsigned int i = 0; i < count; i++)
c->output->add (substitute[i]);
}
inline const Coverage &get_coverage (void) const
{
return this+coverage;
}
inline bool would_apply (hb_would_apply_context_t *c) const
{
TRACE_WOULD_APPLY (this);
return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED);
}
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
if (unlikely (c->nesting_level_left != MAX_NESTING_LEVEL))
return TRACE_RETURN (false); /* No chaining to this type */
unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
const ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead);
if (match_backtrack (c,
backtrack.len, (USHORT *) backtrack.array,
match_coverage, this) &&
match_lookahead (c,
lookahead.len, (USHORT *) lookahead.array,
match_coverage, this,
1))
{
c->replace_glyph_inplace (substitute[index]);
c->buffer->idx--; /* Reverse! */
return TRACE_RETURN (true);
}
return TRACE_RETURN (false);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
if (!(coverage.sanitize (c, this) && backtrack.sanitize (c, this)))
return TRACE_RETURN (false);
OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
if (!lookahead.sanitize (c, this))
return TRACE_RETURN (false);
ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead);
return TRACE_RETURN (substitute.sanitize (c));
}
protected:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of table */
OffsetArrayOf<Coverage>
backtrack; /* Array of coverage tables
* in backtracking sequence, in glyph
* sequence order */
OffsetArrayOf<Coverage>
lookaheadX; /* Array of coverage tables
* in lookahead sequence, in glyph
* sequence order */
ArrayOf<GlyphID>
substituteX; /* Array of substitute
* GlyphIDs--ordered by Coverage Index */
public:
DEFINE_SIZE_MIN (10);
};
struct ReverseChainSingleSubst
{
template <typename context_t>
inline typename context_t::return_t dispatch (context_t *c) const
{
TRACE_DISPATCH (this);
switch (u.format) {
case 1: return TRACE_RETURN (c->dispatch (u.format1));
default:return TRACE_RETURN (c->default_return_value ());
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
protected:
union {
USHORT format; /* Format identifier */
ReverseChainSingleSubstFormat1 format1;
} u;
};
/*
* SubstLookup
*/
struct SubstLookupSubTable
{
friend struct SubstLookup;
enum Type {
Single = 1,
Multiple = 2,
Alternate = 3,
Ligature = 4,
Context = 5,
ChainContext = 6,
Extension = 7,
ReverseChainSingle = 8
};
template <typename context_t>
inline typename context_t::return_t dispatch (context_t *c, unsigned int lookup_type) const
{
TRACE_DISPATCH (this);
switch (lookup_type) {
case Single: return TRACE_RETURN (u.single.dispatch (c));
case Multiple: return TRACE_RETURN (u.multiple.dispatch (c));
case Alternate: return TRACE_RETURN (u.alternate.dispatch (c));
case Ligature: return TRACE_RETURN (u.ligature.dispatch (c));
case Context: return TRACE_RETURN (u.context.dispatch (c));
case ChainContext: return TRACE_RETURN (u.chainContext.dispatch (c));
case Extension: return TRACE_RETURN (u.extension.dispatch (c));
case ReverseChainSingle: return TRACE_RETURN (u.reverseChainContextSingle.dispatch (c));
default: return TRACE_RETURN (c->default_return_value ());
}
}
inline bool sanitize (hb_sanitize_context_t *c, unsigned int lookup_type) {
TRACE_SANITIZE (this);
if (!u.header.sub_format.sanitize (c))
return TRACE_RETURN (false);
switch (lookup_type) {
case Single: return TRACE_RETURN (u.single.sanitize (c));
case Multiple: return TRACE_RETURN (u.multiple.sanitize (c));
case Alternate: return TRACE_RETURN (u.alternate.sanitize (c));
case Ligature: return TRACE_RETURN (u.ligature.sanitize (c));
case Context: return TRACE_RETURN (u.context.sanitize (c));
case ChainContext: return TRACE_RETURN (u.chainContext.sanitize (c));
case Extension: return TRACE_RETURN (u.extension.sanitize (c));
case ReverseChainSingle: return TRACE_RETURN (u.reverseChainContextSingle.sanitize (c));
default: return TRACE_RETURN (true);
}
}
protected:
union {
struct {
USHORT sub_format;
} header;
SingleSubst single;
MultipleSubst multiple;
AlternateSubst alternate;
LigatureSubst ligature;
ContextSubst context;
ChainContextSubst chainContext;
ExtensionSubst extension;
ReverseChainSingleSubst reverseChainContextSingle;
} u;
public:
DEFINE_SIZE_UNION (2, header.sub_format);
};
struct SubstLookup : Lookup
{
inline const SubstLookupSubTable& get_subtable (unsigned int i) const
{ return this+CastR<OffsetArrayOf<SubstLookupSubTable> > (subTable)[i]; }
inline static bool lookup_type_is_reverse (unsigned int lookup_type)
{ return lookup_type == SubstLookupSubTable::ReverseChainSingle; }
inline bool is_reverse (void) const
{
unsigned int type = get_type ();
if (unlikely (type == SubstLookupSubTable::Extension))
return CastR<ExtensionSubst> (get_subtable(0)).is_reverse ();
return lookup_type_is_reverse (type);
}
inline hb_is_inplace_context_t::return_t is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
c->set_recurse_func (dispatch_recurse_func<hb_is_inplace_context_t>);
return TRACE_RETURN (dispatch (c));
}
inline hb_closure_context_t::return_t closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
c->set_recurse_func (dispatch_recurse_func<hb_closure_context_t>);
return TRACE_RETURN (dispatch (c));
}
inline hb_collect_glyphs_context_t::return_t collect_glyphs_lookup (hb_collect_glyphs_context_t *c) const
{
TRACE_COLLECT_GLYPHS (this);
c->set_recurse_func (dispatch_recurse_func<hb_collect_glyphs_context_t>);
return TRACE_RETURN (dispatch (c));
}
template <typename set_t>
inline void add_coverage (set_t *glyphs) const
{
hb_get_coverage_context_t c;
const Coverage *last = NULL;
unsigned int count = get_subtable_count ();
for (unsigned int i = 0; i < count; i++) {
const Coverage *coverage = &get_subtable (i).dispatch (&c, get_type ());
if (coverage != last) {
coverage->add_coverage (glyphs);
last = coverage;
}
}
}
inline bool would_apply (hb_would_apply_context_t *c, const hb_set_digest_t *digest) const
{
TRACE_WOULD_APPLY (this);
if (unlikely (!c->len)) return TRACE_RETURN (false);
if (!digest->may_have (c->glyphs[0])) return TRACE_RETURN (false);
return TRACE_RETURN (dispatch (c));
}
inline bool apply_once (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
if (!c->check_glyph_property (&c->buffer->cur(), c->lookup_props))
return TRACE_RETURN (false);
return TRACE_RETURN (dispatch (c));
}
static bool apply_recurse_func (hb_apply_context_t *c, unsigned int lookup_index);
inline bool apply_string (hb_apply_context_t *c,
unsigned int start,
unsigned int end,
const hb_set_digest_t *digest) const
{
bool inplace = end != (unsigned int) -1;
bool ret = false;
end = MIN (end, c->buffer->len);
if (unlikely (start >= end || !c->lookup_mask))
return false;
c->set_recurse_func (apply_recurse_func);
c->set_lookup (*this);
if (likely (!is_reverse ()))
{
/* in/out forward substitution */
c->buffer->idx = start;
if (inplace)
c->buffer->out_len = start;
while (c->buffer->idx < end)
{
if (digest->may_have (c->buffer->cur().codepoint) &&
(c->buffer->cur().mask & c->lookup_mask) &&
apply_once (c))
ret = true;
else
c->buffer->next_glyph ();
}
}
else
{
/* in-place backward substitution */
c->buffer->remove_output ();
c->buffer->idx = end - 1;
do
{
if (digest->may_have (c->buffer->cur().codepoint) &&
(c->buffer->cur().mask & c->lookup_mask) &&
apply_once (c))
ret = true;
else
c->buffer->idx--;
}
while ((int) c->buffer->idx >= (int) start);
}
return ret;
}
inline SubstLookupSubTable& serialize_subtable (hb_serialize_context_t *c,
unsigned int i)
{ return CastR<OffsetArrayOf<SubstLookupSubTable> > (subTable)[i].serialize (c, this); }
inline bool serialize_single (hb_serialize_context_t *c,
uint32_t lookup_props,
Supplier<GlyphID> &glyphs,
Supplier<GlyphID> &substitutes,
unsigned int num_glyphs)
{
TRACE_SERIALIZE (this);
if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Single, lookup_props, 1))) return TRACE_RETURN (false);
return TRACE_RETURN (serialize_subtable (c, 0).u.single.serialize (c, glyphs, substitutes, num_glyphs));
}
inline bool serialize_multiple (hb_serialize_context_t *c,
uint32_t lookup_props,
Supplier<GlyphID> &glyphs,
Supplier<unsigned int> &substitute_len_list,
unsigned int num_glyphs,
Supplier<GlyphID> &substitute_glyphs_list)
{
TRACE_SERIALIZE (this);
if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Multiple, lookup_props, 1))) return TRACE_RETURN (false);
return TRACE_RETURN (serialize_subtable (c, 0).u.multiple.serialize (c, glyphs, substitute_len_list, num_glyphs,
substitute_glyphs_list));
}
inline bool serialize_alternate (hb_serialize_context_t *c,
uint32_t lookup_props,
Supplier<GlyphID> &glyphs,
Supplier<unsigned int> &alternate_len_list,
unsigned int num_glyphs,
Supplier<GlyphID> &alternate_glyphs_list)
{
TRACE_SERIALIZE (this);
if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Alternate, lookup_props, 1))) return TRACE_RETURN (false);
return TRACE_RETURN (serialize_subtable (c, 0).u.alternate.serialize (c, glyphs, alternate_len_list, num_glyphs,
alternate_glyphs_list));
}
inline bool serialize_ligature (hb_serialize_context_t *c,
uint32_t lookup_props,
Supplier<GlyphID> &first_glyphs,
Supplier<unsigned int> &ligature_per_first_glyph_count_list,
unsigned int num_first_glyphs,
Supplier<GlyphID> &ligatures_list,
Supplier<unsigned int> &component_count_list,
Supplier<GlyphID> &component_list /* Starting from second for each ligature */)
{
TRACE_SERIALIZE (this);
if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Ligature, lookup_props, 1))) return TRACE_RETURN (false);
return TRACE_RETURN (serialize_subtable (c, 0).u.ligature.serialize (c, first_glyphs, ligature_per_first_glyph_count_list, num_first_glyphs,
ligatures_list, component_count_list, component_list));
}
template <typename context_t>
static inline typename context_t::return_t dispatch_recurse_func (context_t *c, unsigned int lookup_index);
template <typename context_t>
inline typename context_t::return_t dispatch (context_t *c) const
{
TRACE_DISPATCH (this);
unsigned int lookup_type = get_type ();
unsigned int count = get_subtable_count ();
for (unsigned int i = 0; i < count; i++) {
typename context_t::return_t r = get_subtable (i).dispatch (c, lookup_type);
if (c->stop_sublookup_iteration (r))
return TRACE_RETURN (r);
}
return TRACE_RETURN (c->default_return_value ());
}
inline bool sanitize (hb_sanitize_context_t *c)
{
TRACE_SANITIZE (this);
if (unlikely (!Lookup::sanitize (c))) return TRACE_RETURN (false);
OffsetArrayOf<SubstLookupSubTable> &list = CastR<OffsetArrayOf<SubstLookupSubTable> > (subTable);
if (unlikely (!list.sanitize (c, this, get_type ()))) return TRACE_RETURN (false);
if (unlikely (get_type () == SubstLookupSubTable::Extension))
{
/* The spec says all subtables of an Extension lookup should
* have the same type. This is specially important if one has
* a reverse type! */
unsigned int type = get_subtable (0).u.extension.get_type ();
unsigned int count = get_subtable_count ();
for (unsigned int i = 1; i < count; i++)
if (get_subtable (i).u.extension.get_type () != type)
return TRACE_RETURN (false);
}
return TRACE_RETURN (true);
}
};
typedef OffsetListOf<SubstLookup> SubstLookupList;
/*
* GSUB -- The Glyph Substitution Table
*/
struct GSUB : GSUBGPOS
{
static const hb_tag_t Tag = HB_OT_TAG_GSUB;
inline const SubstLookup& get_lookup (unsigned int i) const
{ return CastR<SubstLookup> (GSUBGPOS::get_lookup (i)); }
static inline void substitute_start (hb_font_t *font, hb_buffer_t *buffer);
static inline void substitute_finish (hb_font_t *font, hb_buffer_t *buffer);
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
if (unlikely (!GSUBGPOS::sanitize (c))) return TRACE_RETURN (false);
OffsetTo<SubstLookupList> &list = CastR<OffsetTo<SubstLookupList> > (lookupList);
return TRACE_RETURN (list.sanitize (c, this));
}
public:
DEFINE_SIZE_STATIC (10);
};
void
GSUB::substitute_start (hb_font_t *font, hb_buffer_t *buffer)
{
HB_BUFFER_ALLOCATE_VAR (buffer, glyph_props);
HB_BUFFER_ALLOCATE_VAR (buffer, lig_props);
HB_BUFFER_ALLOCATE_VAR (buffer, syllable);
const GDEF &gdef = *hb_ot_layout_from_face (font->face)->gdef;
unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; i++) {
buffer->info[i].lig_props() = buffer->info[i].syllable() = 0;
buffer->info[i].glyph_props() = gdef.get_glyph_props (buffer->info[i].codepoint);
}
}
void
GSUB::substitute_finish (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer HB_UNUSED)
{
}
/* Out-of-class implementation for methods recursing */
inline bool ExtensionSubst::is_reverse (void) const
{
unsigned int type = get_type ();
if (unlikely (type == SubstLookupSubTable::Extension))
return CastR<ExtensionSubst> (get_subtable<SubstLookupSubTable>()).is_reverse ();
return SubstLookup::lookup_type_is_reverse (type);
}
template <typename context_t>
inline typename context_t::return_t SubstLookup::dispatch_recurse_func (context_t *c, unsigned int lookup_index)
{
const GSUB &gsub = *(hb_ot_layout_from_face (c->face)->gsub);
const SubstLookup &l = gsub.get_lookup (lookup_index);
return l.dispatch (c);
}
inline bool SubstLookup::apply_recurse_func (hb_apply_context_t *c, unsigned int lookup_index)
{
const GSUB &gsub = *(hb_ot_layout_from_face (c->face)->gsub);
const SubstLookup &l = gsub.get_lookup (lookup_index);
unsigned int saved_lookup_props = c->lookup_props;
c->set_lookup (l);
bool ret = l.apply_once (c);
c->lookup_props = saved_lookup_props;
return ret;
}
} /* namespace OT */
#endif /* HB_OT_LAYOUT_GSUB_TABLE_HH */