956 lines
27 KiB
C++
956 lines
27 KiB
C++
/*
|
|
* Copyright (C) 2007,2008,2009,2010 Red Hat, 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
|
|
*/
|
|
|
|
#ifndef HB_OT_LAYOUT_GSUBGPOS_PRIVATE_HH
|
|
#define HB_OT_LAYOUT_GSUBGPOS_PRIVATE_HH
|
|
|
|
#include "hb-buffer-private.hh"
|
|
#include "hb-ot-layout-gdef-private.hh"
|
|
|
|
HB_BEGIN_DECLS
|
|
|
|
|
|
#ifndef HB_DEBUG_APPLY
|
|
#define HB_DEBUG_APPLY HB_DEBUG+0
|
|
#endif
|
|
|
|
#define TRACE_APPLY() \
|
|
hb_trace_t<HB_DEBUG_APPLY> trace (&c->debug_depth, "APPLY", HB_FUNC, this); \
|
|
|
|
|
|
HB_BEGIN_DECLS
|
|
|
|
struct hb_apply_context_t
|
|
{
|
|
unsigned int debug_depth;
|
|
hb_ot_layout_context_t *layout;
|
|
hb_buffer_t *buffer;
|
|
hb_mask_t lookup_mask;
|
|
unsigned int context_length;
|
|
unsigned int nesting_level_left;
|
|
unsigned int lookup_flag;
|
|
unsigned int property; /* propety of first glyph (TODO remove) */
|
|
};
|
|
|
|
|
|
|
|
typedef bool (*match_func_t) (hb_codepoint_t glyph_id, const USHORT &value, const void *data);
|
|
typedef bool (*apply_lookup_func_t) (hb_apply_context_t *c, unsigned int lookup_index);
|
|
|
|
struct ContextFuncs
|
|
{
|
|
match_func_t match;
|
|
apply_lookup_func_t apply;
|
|
};
|
|
|
|
|
|
static inline bool match_glyph (hb_codepoint_t glyph_id, const USHORT &value, const void *data HB_UNUSED)
|
|
{
|
|
return glyph_id == value;
|
|
}
|
|
|
|
static inline bool match_class (hb_codepoint_t glyph_id, const USHORT &value, const void *data)
|
|
{
|
|
const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data);
|
|
return class_def.get_class (glyph_id) == value;
|
|
}
|
|
|
|
static inline bool match_coverage (hb_codepoint_t glyph_id, const USHORT &value, const void *data)
|
|
{
|
|
const OffsetTo<Coverage> &coverage = (const OffsetTo<Coverage>&)value;
|
|
return (data+coverage) (glyph_id) != NOT_COVERED;
|
|
}
|
|
|
|
|
|
static inline bool match_input (hb_apply_context_t *c,
|
|
unsigned int count, /* Including the first glyph (not matched) */
|
|
const USHORT input[], /* Array of input values--start with second glyph */
|
|
match_func_t match_func,
|
|
const void *match_data,
|
|
unsigned int *context_length_out)
|
|
{
|
|
unsigned int i, j;
|
|
unsigned int end = MIN (c->buffer->len, c->buffer->i + c->context_length);
|
|
if (unlikely (c->buffer->i + count > end))
|
|
return false;
|
|
|
|
for (i = 1, j = c->buffer->i + 1; i < count; i++, j++)
|
|
{
|
|
while (_hb_ot_layout_skip_mark (c->layout->face, &c->buffer->info[j], c->lookup_flag, NULL))
|
|
{
|
|
if (unlikely (j + count - i == end))
|
|
return false;
|
|
j++;
|
|
}
|
|
|
|
if (likely (!match_func (c->buffer->info[j].codepoint, input[i - 1], match_data)))
|
|
return false;
|
|
}
|
|
|
|
*context_length_out = j - c->buffer->i;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool match_backtrack (hb_apply_context_t *c,
|
|
unsigned int count,
|
|
const USHORT backtrack[],
|
|
match_func_t match_func,
|
|
const void *match_data)
|
|
{
|
|
if (unlikely (c->buffer->out_len < count))
|
|
return false;
|
|
|
|
for (unsigned int i = 0, j = c->buffer->out_len - 1; i < count; i++, j--)
|
|
{
|
|
while (_hb_ot_layout_skip_mark (c->layout->face, &c->buffer->out_info[j], c->lookup_flag, NULL))
|
|
{
|
|
if (unlikely (j + 1 == count - i))
|
|
return false;
|
|
j--;
|
|
}
|
|
|
|
if (likely (!match_func (c->buffer->out_info[j].codepoint, backtrack[i], match_data)))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool match_lookahead (hb_apply_context_t *c,
|
|
unsigned int count,
|
|
const USHORT lookahead[],
|
|
match_func_t match_func,
|
|
const void *match_data,
|
|
unsigned int offset)
|
|
{
|
|
unsigned int i, j;
|
|
unsigned int end = MIN (c->buffer->len, c->buffer->i + c->context_length);
|
|
if (unlikely (c->buffer->i + offset + count > end))
|
|
return false;
|
|
|
|
for (i = 0, j = c->buffer->i + offset; i < count; i++, j++)
|
|
{
|
|
while (_hb_ot_layout_skip_mark (c->layout->face, &c->buffer->info[j], c->lookup_flag, NULL))
|
|
{
|
|
if (unlikely (j + count - i == end))
|
|
return false;
|
|
j++;
|
|
}
|
|
|
|
if (likely (!match_func (c->buffer->info[j].codepoint, lookahead[i], match_data)))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
HB_END_DECLS
|
|
|
|
|
|
struct LookupRecord
|
|
{
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return c->check_struct (this);
|
|
}
|
|
|
|
USHORT sequenceIndex; /* Index into current glyph
|
|
* sequence--first glyph = 0 */
|
|
USHORT lookupListIndex; /* Lookup to apply to that
|
|
* position--zero--based */
|
|
public:
|
|
DEFINE_SIZE_STATIC (4);
|
|
};
|
|
|
|
|
|
HB_BEGIN_DECLS
|
|
|
|
static inline bool apply_lookup (hb_apply_context_t *c,
|
|
unsigned int count, /* Including the first glyph */
|
|
unsigned int lookupCount,
|
|
const LookupRecord lookupRecord[], /* Array of LookupRecords--in design order */
|
|
apply_lookup_func_t apply_func)
|
|
{
|
|
unsigned int end = MIN (c->buffer->len, c->buffer->i + c->context_length);
|
|
if (unlikely (c->buffer->i + count > end))
|
|
return false;
|
|
|
|
/* TODO We don't support lookupRecord arrays that are not increasing:
|
|
* Should be easy for in_place ones at least. */
|
|
|
|
/* Note: If sublookup is reverse, i will underflow after the first loop
|
|
* and we jump out of it. Not entirely disastrous. So we don't check
|
|
* for reverse lookup here.
|
|
*/
|
|
for (unsigned int i = 0; i < count; /* NOP */)
|
|
{
|
|
while (_hb_ot_layout_skip_mark (c->layout->face, &c->buffer->info[c->buffer->i], c->lookup_flag, NULL))
|
|
{
|
|
if (unlikely (c->buffer->i == end))
|
|
return true;
|
|
/* No lookup applied for this index */
|
|
c->buffer->next_glyph ();
|
|
}
|
|
|
|
if (lookupCount && i == lookupRecord->sequenceIndex)
|
|
{
|
|
unsigned int old_pos = c->buffer->i;
|
|
|
|
/* Apply a lookup */
|
|
bool done = apply_func (c, lookupRecord->lookupListIndex);
|
|
|
|
lookupRecord++;
|
|
lookupCount--;
|
|
/* Err, this is wrong if the lookup jumped over some glyphs */
|
|
i += c->buffer->i - old_pos;
|
|
if (unlikely (c->buffer->i == end))
|
|
return true;
|
|
|
|
if (!done)
|
|
goto not_applied;
|
|
}
|
|
else
|
|
{
|
|
not_applied:
|
|
/* No lookup applied for this index */
|
|
c->buffer->next_glyph ();
|
|
i++;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
HB_END_DECLS
|
|
|
|
|
|
/* Contextual lookups */
|
|
|
|
struct ContextLookupContext
|
|
{
|
|
ContextFuncs funcs;
|
|
const void *match_data;
|
|
};
|
|
|
|
static inline bool context_lookup (hb_apply_context_t *c,
|
|
unsigned int inputCount, /* Including the first glyph (not matched) */
|
|
const USHORT input[], /* Array of input values--start with second glyph */
|
|
unsigned int lookupCount,
|
|
const LookupRecord lookupRecord[],
|
|
ContextLookupContext &lookup_context)
|
|
{
|
|
hb_apply_context_t new_context = *c;
|
|
return match_input (c,
|
|
inputCount, input,
|
|
lookup_context.funcs.match, lookup_context.match_data,
|
|
&new_context.context_length)
|
|
&& apply_lookup (&new_context,
|
|
inputCount,
|
|
lookupCount, lookupRecord,
|
|
lookup_context.funcs.apply);
|
|
}
|
|
|
|
struct Rule
|
|
{
|
|
friend struct RuleSet;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c, ContextLookupContext &lookup_context) const
|
|
{
|
|
TRACE_APPLY ();
|
|
const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (input, input[0].static_size * (inputCount ? inputCount - 1 : 0));
|
|
return context_lookup (c,
|
|
inputCount, input,
|
|
lookupCount, lookupRecord,
|
|
lookup_context);
|
|
}
|
|
|
|
public:
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return inputCount.sanitize (c)
|
|
&& lookupCount.sanitize (c)
|
|
&& c->check_range (input,
|
|
input[0].static_size * inputCount
|
|
+ lookupRecordX[0].static_size * lookupCount);
|
|
}
|
|
|
|
private:
|
|
USHORT inputCount; /* Total number of glyphs in input
|
|
* glyph sequence--includes the first
|
|
* glyph */
|
|
USHORT lookupCount; /* Number of LookupRecords */
|
|
USHORT input[VAR]; /* Array of match inputs--start with
|
|
* second glyph */
|
|
LookupRecord lookupRecordX[VAR]; /* Array of LookupRecords--in
|
|
* design order */
|
|
public:
|
|
DEFINE_SIZE_ARRAY2 (4, input, lookupRecordX);
|
|
};
|
|
|
|
struct RuleSet
|
|
{
|
|
inline bool apply (hb_apply_context_t *c, ContextLookupContext &lookup_context) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int num_rules = rule.len;
|
|
for (unsigned int i = 0; i < num_rules; i++)
|
|
{
|
|
if ((this+rule[i]).apply (c, lookup_context))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return rule.sanitize (c, this);
|
|
}
|
|
|
|
private:
|
|
OffsetArrayOf<Rule>
|
|
rule; /* Array of Rule tables
|
|
* ordered by preference */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (2, rule);
|
|
};
|
|
|
|
|
|
struct ContextFormat1
|
|
{
|
|
friend struct Context;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int index = (this+coverage) (c->buffer->info[c->buffer->i].codepoint);
|
|
if (likely (index == NOT_COVERED))
|
|
return false;
|
|
|
|
const RuleSet &rule_set = this+ruleSet[index];
|
|
struct ContextLookupContext lookup_context = {
|
|
{match_glyph, apply_func},
|
|
NULL
|
|
};
|
|
return rule_set.apply (c, lookup_context);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return coverage.sanitize (c, this)
|
|
&& ruleSet.sanitize (c, this);
|
|
}
|
|
|
|
private:
|
|
USHORT format; /* Format identifier--format = 1 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of table */
|
|
OffsetArrayOf<RuleSet>
|
|
ruleSet; /* Array of RuleSet tables
|
|
* ordered by Coverage Index */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (6, ruleSet);
|
|
};
|
|
|
|
|
|
struct ContextFormat2
|
|
{
|
|
friend struct Context;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int index = (this+coverage) (c->buffer->info[c->buffer->i].codepoint);
|
|
if (likely (index == NOT_COVERED))
|
|
return false;
|
|
|
|
const ClassDef &class_def = this+classDef;
|
|
index = class_def (c->buffer->info[c->buffer->i].codepoint);
|
|
const RuleSet &rule_set = this+ruleSet[index];
|
|
/* LONGTERMTODO: Old code fetches glyph classes at most once and caches
|
|
* them across subrule lookups. Not sure it's worth it.
|
|
*/
|
|
struct ContextLookupContext lookup_context = {
|
|
{match_class, apply_func},
|
|
&class_def
|
|
};
|
|
return rule_set.apply (c, lookup_context);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return coverage.sanitize (c, this)
|
|
&& classDef.sanitize (c, this)
|
|
&& ruleSet.sanitize (c, this);
|
|
}
|
|
|
|
private:
|
|
USHORT format; /* Format identifier--format = 2 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of table */
|
|
OffsetTo<ClassDef>
|
|
classDef; /* Offset to glyph ClassDef table--from
|
|
* beginning of table */
|
|
OffsetArrayOf<RuleSet>
|
|
ruleSet; /* Array of RuleSet tables
|
|
* ordered by class */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (8, ruleSet);
|
|
};
|
|
|
|
|
|
struct ContextFormat3
|
|
{
|
|
friend struct Context;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int index = (this+coverage[0]) (c->buffer->info[c->buffer->i].codepoint);
|
|
if (likely (index == NOT_COVERED))
|
|
return false;
|
|
|
|
const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverage, coverage[0].static_size * glyphCount);
|
|
struct ContextLookupContext lookup_context = {
|
|
{match_coverage, apply_func},
|
|
this
|
|
};
|
|
return context_lookup (c,
|
|
glyphCount, (const USHORT *) (coverage + 1),
|
|
lookupCount, lookupRecord,
|
|
lookup_context);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!c->check_struct (this)) return false;
|
|
unsigned int count = glyphCount;
|
|
if (!c->check_array (coverage, coverage[0].static_size, count)) return false;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
if (!coverage[i].sanitize (c, this)) return false;
|
|
LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverage, coverage[0].static_size * count);
|
|
return c->check_array (lookupRecord, lookupRecord[0].static_size, lookupCount);
|
|
}
|
|
|
|
private:
|
|
USHORT format; /* Format identifier--format = 3 */
|
|
USHORT glyphCount; /* Number of glyphs in the input glyph
|
|
* sequence */
|
|
USHORT lookupCount; /* Number of LookupRecords */
|
|
OffsetTo<Coverage>
|
|
coverage[VAR]; /* Array of offsets to Coverage
|
|
* table in glyph sequence order */
|
|
LookupRecord lookupRecordX[VAR]; /* Array of LookupRecords--in
|
|
* design order */
|
|
public:
|
|
DEFINE_SIZE_ARRAY2 (6, coverage, lookupRecordX);
|
|
};
|
|
|
|
struct Context
|
|
{
|
|
protected:
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return u.format1.apply (c, apply_func);
|
|
case 2: return u.format2.apply (c, apply_func);
|
|
case 3: return u.format3.apply (c, apply_func);
|
|
default:return false;
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return false;
|
|
switch (u.format) {
|
|
case 1: return u.format1.sanitize (c);
|
|
case 2: return u.format2.sanitize (c);
|
|
case 3: return u.format3.sanitize (c);
|
|
default:return true;
|
|
}
|
|
}
|
|
|
|
private:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
ContextFormat1 format1;
|
|
ContextFormat2 format2;
|
|
ContextFormat3 format3;
|
|
} u;
|
|
};
|
|
|
|
|
|
/* Chaining Contextual lookups */
|
|
|
|
struct ChainContextLookupContext
|
|
{
|
|
ContextFuncs funcs;
|
|
const void *match_data[3];
|
|
};
|
|
|
|
static inline bool chain_context_lookup (hb_apply_context_t *c,
|
|
unsigned int backtrackCount,
|
|
const USHORT backtrack[],
|
|
unsigned int inputCount, /* Including the first glyph (not matched) */
|
|
const USHORT input[], /* Array of input values--start with second glyph */
|
|
unsigned int lookaheadCount,
|
|
const USHORT lookahead[],
|
|
unsigned int lookupCount,
|
|
const LookupRecord lookupRecord[],
|
|
ChainContextLookupContext &lookup_context)
|
|
{
|
|
/* First guess */
|
|
if (unlikely (c->buffer->out_len < backtrackCount ||
|
|
c->buffer->i + inputCount + lookaheadCount > c->buffer->len ||
|
|
inputCount + lookaheadCount > c->context_length))
|
|
return false;
|
|
|
|
hb_apply_context_t new_context = *c;
|
|
return match_backtrack (c,
|
|
backtrackCount, backtrack,
|
|
lookup_context.funcs.match, lookup_context.match_data[0])
|
|
&& match_input (c,
|
|
inputCount, input,
|
|
lookup_context.funcs.match, lookup_context.match_data[1],
|
|
&new_context.context_length)
|
|
&& match_lookahead (c,
|
|
lookaheadCount, lookahead,
|
|
lookup_context.funcs.match, lookup_context.match_data[2],
|
|
new_context.context_length)
|
|
&& apply_lookup (&new_context,
|
|
inputCount,
|
|
lookupCount, lookupRecord,
|
|
lookup_context.funcs.apply);
|
|
}
|
|
|
|
struct ChainRule
|
|
{
|
|
friend struct ChainRuleSet;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c, ChainContextLookupContext &lookup_context) const
|
|
{
|
|
TRACE_APPLY ();
|
|
const HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack);
|
|
const ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input);
|
|
const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
|
|
return chain_context_lookup (c,
|
|
backtrack.len, backtrack.array,
|
|
input.len, input.array,
|
|
lookahead.len, lookahead.array,
|
|
lookup.len, lookup.array,
|
|
lookup_context);
|
|
return false;
|
|
}
|
|
|
|
public:
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!backtrack.sanitize (c)) return false;
|
|
HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack);
|
|
if (!input.sanitize (c)) return false;
|
|
ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input);
|
|
if (!lookahead.sanitize (c)) return false;
|
|
ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
|
|
return lookup.sanitize (c);
|
|
}
|
|
|
|
private:
|
|
ArrayOf<USHORT>
|
|
backtrack; /* Array of backtracking values
|
|
* (to be matched before the input
|
|
* sequence) */
|
|
HeadlessArrayOf<USHORT>
|
|
inputX; /* Array of input values (start with
|
|
* second glyph) */
|
|
ArrayOf<USHORT>
|
|
lookaheadX; /* Array of lookahead values's (to be
|
|
* matched after the input sequence) */
|
|
ArrayOf<LookupRecord>
|
|
lookupX; /* Array of LookupRecords--in
|
|
* design order) */
|
|
public:
|
|
DEFINE_SIZE_MIN (8);
|
|
};
|
|
|
|
struct ChainRuleSet
|
|
{
|
|
inline bool apply (hb_apply_context_t *c, ChainContextLookupContext &lookup_context) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int num_rules = rule.len;
|
|
for (unsigned int i = 0; i < num_rules; i++)
|
|
{
|
|
if ((this+rule[i]).apply (c, lookup_context))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return rule.sanitize (c, this);
|
|
}
|
|
|
|
private:
|
|
OffsetArrayOf<ChainRule>
|
|
rule; /* Array of ChainRule tables
|
|
* ordered by preference */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (2, rule);
|
|
};
|
|
|
|
struct ChainContextFormat1
|
|
{
|
|
friend struct ChainContext;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int index = (this+coverage) (c->buffer->info[c->buffer->i].codepoint);
|
|
if (likely (index == NOT_COVERED))
|
|
return false;
|
|
|
|
const ChainRuleSet &rule_set = this+ruleSet[index];
|
|
struct ChainContextLookupContext lookup_context = {
|
|
{match_glyph, apply_func},
|
|
{NULL, NULL, NULL}
|
|
};
|
|
return rule_set.apply (c, lookup_context);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return coverage.sanitize (c, this)
|
|
&& ruleSet.sanitize (c, this);
|
|
}
|
|
|
|
private:
|
|
USHORT format; /* Format identifier--format = 1 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of table */
|
|
OffsetArrayOf<ChainRuleSet>
|
|
ruleSet; /* Array of ChainRuleSet tables
|
|
* ordered by Coverage Index */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (6, ruleSet);
|
|
};
|
|
|
|
struct ChainContextFormat2
|
|
{
|
|
friend struct ChainContext;
|
|
|
|
private:
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
unsigned int index = (this+coverage) (c->buffer->info[c->buffer->i].codepoint);
|
|
if (likely (index == NOT_COVERED))
|
|
return false;
|
|
|
|
const ClassDef &backtrack_class_def = this+backtrackClassDef;
|
|
const ClassDef &input_class_def = this+inputClassDef;
|
|
const ClassDef &lookahead_class_def = this+lookaheadClassDef;
|
|
|
|
index = input_class_def (c->buffer->info[c->buffer->i].codepoint);
|
|
const ChainRuleSet &rule_set = this+ruleSet[index];
|
|
/* LONGTERMTODO: Old code fetches glyph classes at most once and caches
|
|
* them across subrule lookups. Not sure it's worth it.
|
|
*/
|
|
struct ChainContextLookupContext lookup_context = {
|
|
{match_class, apply_func},
|
|
{&backtrack_class_def,
|
|
&input_class_def,
|
|
&lookahead_class_def}
|
|
};
|
|
return rule_set.apply (c, lookup_context);
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return coverage.sanitize (c, this)
|
|
&& backtrackClassDef.sanitize (c, this)
|
|
&& inputClassDef.sanitize (c, this)
|
|
&& lookaheadClassDef.sanitize (c, this)
|
|
&& ruleSet.sanitize (c, this);
|
|
}
|
|
|
|
private:
|
|
USHORT format; /* Format identifier--format = 2 */
|
|
OffsetTo<Coverage>
|
|
coverage; /* Offset to Coverage table--from
|
|
* beginning of table */
|
|
OffsetTo<ClassDef>
|
|
backtrackClassDef; /* Offset to glyph ClassDef table
|
|
* containing backtrack sequence
|
|
* data--from beginning of table */
|
|
OffsetTo<ClassDef>
|
|
inputClassDef; /* Offset to glyph ClassDef
|
|
* table containing input sequence
|
|
* data--from beginning of table */
|
|
OffsetTo<ClassDef>
|
|
lookaheadClassDef; /* Offset to glyph ClassDef table
|
|
* containing lookahead sequence
|
|
* data--from beginning of table */
|
|
OffsetArrayOf<ChainRuleSet>
|
|
ruleSet; /* Array of ChainRuleSet tables
|
|
* ordered by class */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (12, ruleSet);
|
|
};
|
|
|
|
struct ChainContextFormat3
|
|
{
|
|
friend struct ChainContext;
|
|
|
|
private:
|
|
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
|
|
|
|
unsigned int index = (this+input[0]) (c->buffer->info[c->buffer->i].codepoint);
|
|
if (likely (index == NOT_COVERED))
|
|
return false;
|
|
|
|
const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input);
|
|
const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
|
|
struct ChainContextLookupContext lookup_context = {
|
|
{match_coverage, apply_func},
|
|
{this, this, this}
|
|
};
|
|
return chain_context_lookup (c,
|
|
backtrack.len, (const USHORT *) backtrack.array,
|
|
input.len, (const USHORT *) input.array + 1,
|
|
lookahead.len, (const USHORT *) lookahead.array,
|
|
lookup.len, lookup.array,
|
|
lookup_context);
|
|
return false;
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!backtrack.sanitize (c, this)) return false;
|
|
OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
|
|
if (!input.sanitize (c, this)) return false;
|
|
OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input);
|
|
if (!lookahead.sanitize (c, this)) return false;
|
|
ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
|
|
return lookup.sanitize (c);
|
|
}
|
|
|
|
private:
|
|
USHORT format; /* Format identifier--format = 3 */
|
|
OffsetArrayOf<Coverage>
|
|
backtrack; /* Array of coverage tables
|
|
* in backtracking sequence, in glyph
|
|
* sequence order */
|
|
OffsetArrayOf<Coverage>
|
|
inputX ; /* Array of coverage
|
|
* tables in input sequence, in glyph
|
|
* sequence order */
|
|
OffsetArrayOf<Coverage>
|
|
lookaheadX; /* Array of coverage tables
|
|
* in lookahead sequence, in glyph
|
|
* sequence order */
|
|
ArrayOf<LookupRecord>
|
|
lookupX; /* Array of LookupRecords--in
|
|
* design order) */
|
|
public:
|
|
DEFINE_SIZE_MIN (10);
|
|
};
|
|
|
|
struct ChainContext
|
|
{
|
|
protected:
|
|
inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const
|
|
{
|
|
TRACE_APPLY ();
|
|
switch (u.format) {
|
|
case 1: return u.format1.apply (c, apply_func);
|
|
case 2: return u.format2.apply (c, apply_func);
|
|
case 3: return u.format3.apply (c, apply_func);
|
|
default:return false;
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return false;
|
|
switch (u.format) {
|
|
case 1: return u.format1.sanitize (c);
|
|
case 2: return u.format2.sanitize (c);
|
|
case 3: return u.format3.sanitize (c);
|
|
default:return true;
|
|
}
|
|
}
|
|
|
|
private:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
ChainContextFormat1 format1;
|
|
ChainContextFormat2 format2;
|
|
ChainContextFormat3 format3;
|
|
} u;
|
|
};
|
|
|
|
|
|
struct ExtensionFormat1
|
|
{
|
|
friend struct Extension;
|
|
|
|
protected:
|
|
inline unsigned int get_type (void) const { return extensionLookupType; }
|
|
inline unsigned int get_offset (void) const { return extensionOffset; }
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return c->check_struct (this);
|
|
}
|
|
|
|
private:
|
|
USHORT format; /* Format identifier. Set to 1. */
|
|
USHORT extensionLookupType; /* Lookup type of subtable referenced
|
|
* by ExtensionOffset (i.e. the
|
|
* extension subtable). */
|
|
ULONG extensionOffset; /* Offset to the extension subtable,
|
|
* of lookup type subtable. */
|
|
public:
|
|
DEFINE_SIZE_STATIC (8);
|
|
};
|
|
|
|
struct Extension
|
|
{
|
|
inline unsigned int get_type (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_type ();
|
|
default:return 0;
|
|
}
|
|
}
|
|
inline unsigned int get_offset (void) const
|
|
{
|
|
switch (u.format) {
|
|
case 1: return u.format1.get_offset ();
|
|
default:return 0;
|
|
}
|
|
}
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
if (!u.format.sanitize (c)) return false;
|
|
switch (u.format) {
|
|
case 1: return u.format1.sanitize (c);
|
|
default:return true;
|
|
}
|
|
}
|
|
|
|
private:
|
|
union {
|
|
USHORT format; /* Format identifier */
|
|
ExtensionFormat1 format1;
|
|
} u;
|
|
};
|
|
|
|
|
|
/*
|
|
* GSUB/GPOS Common
|
|
*/
|
|
|
|
struct GSUBGPOS
|
|
{
|
|
static const hb_tag_t GSUBTag = HB_OT_TAG_GSUB;
|
|
static const hb_tag_t GPOSTag = HB_OT_TAG_GPOS;
|
|
|
|
inline unsigned int get_script_count (void) const
|
|
{ return (this+scriptList).len; }
|
|
inline const Tag& get_script_tag (unsigned int i) const
|
|
{ return (this+scriptList).get_tag (i); }
|
|
inline unsigned int get_script_tags (unsigned int start_offset,
|
|
unsigned int *script_count /* IN/OUT */,
|
|
hb_tag_t *script_tags /* OUT */) const
|
|
{ return (this+scriptList).get_tags (start_offset, script_count, script_tags); }
|
|
inline const Script& get_script (unsigned int i) const
|
|
{ return (this+scriptList)[i]; }
|
|
inline bool find_script_index (hb_tag_t tag, unsigned int *index) const
|
|
{ return (this+scriptList).find_index (tag, index); }
|
|
|
|
inline unsigned int get_feature_count (void) const
|
|
{ return (this+featureList).len; }
|
|
inline const Tag& get_feature_tag (unsigned int i) const
|
|
{ return (this+featureList).get_tag (i); }
|
|
inline unsigned int get_feature_tags (unsigned int start_offset,
|
|
unsigned int *feature_count /* IN/OUT */,
|
|
hb_tag_t *feature_tags /* OUT */) const
|
|
{ return (this+featureList).get_tags (start_offset, feature_count, feature_tags); }
|
|
inline const Feature& get_feature (unsigned int i) const
|
|
{ return (this+featureList)[i]; }
|
|
inline bool find_feature_index (hb_tag_t tag, unsigned int *index) const
|
|
{ return (this+featureList).find_index (tag, index); }
|
|
|
|
inline unsigned int get_lookup_count (void) const
|
|
{ return (this+lookupList).len; }
|
|
inline const Lookup& get_lookup (unsigned int i) const
|
|
{ return (this+lookupList)[i]; }
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) {
|
|
TRACE_SANITIZE ();
|
|
return version.sanitize (c) && likely (version.major == 1)
|
|
&& scriptList.sanitize (c, this)
|
|
&& featureList.sanitize (c, this)
|
|
&& lookupList.sanitize (c, this);
|
|
}
|
|
|
|
protected:
|
|
FixedVersion version; /* Version of the GSUB/GPOS table--initially set
|
|
* to 0x00010000 */
|
|
OffsetTo<ScriptList>
|
|
scriptList; /* ScriptList table */
|
|
OffsetTo<FeatureList>
|
|
featureList; /* FeatureList table */
|
|
OffsetTo<LookupList>
|
|
lookupList; /* LookupList table */
|
|
public:
|
|
DEFINE_SIZE_STATIC (10);
|
|
};
|
|
|
|
|
|
HB_END_DECLS
|
|
|
|
#endif /* HB_OT_LAYOUT_GSUBGPOS_PRIVATE_HH */
|