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[OTLayout] Add is_inplace() method to GSUB

This commit is contained in:
Behdad Esfahbod 2013-04-24 16:42:05 -04:00
parent 07034f447b
commit 1b972d893a
4 changed files with 264 additions and 0 deletions
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56
src/hb-ot-layout-gsub-table.hh
View File

@ -37,6 +37,12 @@ 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);
@ -115,6 +121,12 @@ struct SingleSubstFormat1
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);
@ -251,6 +263,13 @@ struct SingleSubst
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);
@ -315,6 +334,18 @@ struct Sequence
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);
@ -440,6 +471,12 @@ typedef ArrayOf<GlyphID> AlternateSet; /* Array of alternate GlyphIDs--in
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);
@ -760,6 +797,12 @@ struct LigatureSet
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);
@ -908,6 +951,12 @@ struct ExtensionSubst : Extension<ExtensionSubst>
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);
@ -1145,6 +1194,13 @@ struct SubstLookup : Lookup
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);

158
src/hb-ot-layout-gsubgpos-private.hh
View File

@ -44,6 +44,55 @@ namespace OT {
"");
#ifndef HB_DEBUG_IS_INPLACE
#define HB_DEBUG_IS_INPLACE (HB_DEBUG+0)
#endif
#define TRACE_IS_INPLACE(this) \
hb_auto_trace_t<HB_DEBUG_IS_INPLACE, bool> trace \
(&c->debug_depth, c->get_name (), this, HB_FUNC, \
"");
struct hb_is_inplace_context_t
{
inline const char *get_name (void) { return "IS_INPLACE"; }
static const unsigned int max_debug_depth = HB_DEBUG_IS_INPLACE;
typedef bool return_t;
typedef return_t (*recurse_func_t) (hb_is_inplace_context_t *c, unsigned int lookup_index);
template <typename T>
inline return_t dispatch (const T &obj) { return obj.is_inplace (this); }
static return_t default_return_value (void) { return true; }
bool stop_sublookup_iteration (return_t r) const { return !r; }
return_t recurse (unsigned int lookup_index)
{
if (unlikely (nesting_level_left == 0 || !recurse_func))
return default_return_value ();
nesting_level_left--;
bool ret = recurse_func (this, lookup_index);
nesting_level_left++;
return ret;
}
hb_face_t *face;
recurse_func_t recurse_func;
unsigned int nesting_level_left;
unsigned int debug_depth;
hb_is_inplace_context_t (hb_face_t *face_,
unsigned int nesting_level_left_ = MAX_NESTING_LEVEL) :
face (face_),
recurse_func (NULL),
nesting_level_left (nesting_level_left_),
debug_depth (0) {}
void set_recurse_func (recurse_func_t func) { recurse_func = func; }
};
#ifndef HB_DEBUG_CLOSURE
#define HB_DEBUG_CLOSURE (HB_DEBUG+0)
#endif
@ -1096,6 +1145,17 @@ static inline bool context_apply_lookup (hb_apply_context_t *c,
struct Rule
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (input, input[0].static_size * (inputCount ? inputCount - 1 : 0));
unsigned int count = lookupCount;
for (unsigned int i = 0; i < count; i++)
if (!c->recurse (lookupRecord[i].lookupListIndex))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const
{
TRACE_CLOSURE (this);
@ -1155,6 +1215,16 @@ struct Rule
struct RuleSet
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
unsigned int num_rules = rule.len;
for (unsigned int i = 0; i < num_rules; i++)
if (!(this+rule[i]).is_inplace (c))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const
{
TRACE_CLOSURE (this);
@ -1211,6 +1281,16 @@ struct RuleSet
struct ContextFormat1
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
unsigned int count = ruleSet.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+ruleSet[i]).is_inplace (c))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
@ -1297,6 +1377,16 @@ struct ContextFormat1
struct ContextFormat2
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
unsigned int count = ruleSet.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+ruleSet[i]).is_inplace (c))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
@ -1392,6 +1482,17 @@ struct ContextFormat2
struct ContextFormat3
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverage, coverage[0].static_size * glyphCount);
unsigned int count = lookupCount;
for (unsigned int i = 0; i < count; i++)
if (!c->recurse (lookupRecord[i].lookupListIndex))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
@ -1633,6 +1734,19 @@ static inline bool chain_context_apply_lookup (hb_apply_context_t *c,
struct ChainRule
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
const HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack);
const ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input);
const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
unsigned int count = lookup.len;
for (unsigned int i = 0; i < count; i++)
if (!c->recurse (lookup.array[i].lookupListIndex))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c, ChainContextClosureLookupContext &lookup_context) const
{
TRACE_CLOSURE (this);
@ -1718,6 +1832,16 @@ struct ChainRule
struct ChainRuleSet
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
unsigned int num_rules = rule.len;
for (unsigned int i = 0; i < num_rules; i++)
if (!(this+rule[i]).is_inplace (c))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c, ChainContextClosureLookupContext &lookup_context) const
{
TRACE_CLOSURE (this);
@ -1771,6 +1895,16 @@ struct ChainRuleSet
struct ChainContextFormat1
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
unsigned int count = ruleSet.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+ruleSet[i]).is_inplace (c))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
@ -1854,6 +1988,16 @@ struct ChainContextFormat1
struct ChainContextFormat2
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
unsigned int count = ruleSet.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+ruleSet[i]).is_inplace (c))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);
@ -1978,6 +2122,20 @@ struct ChainContextFormat2
struct ChainContextFormat3
{
inline bool is_inplace (hb_is_inplace_context_t *c) const
{
TRACE_IS_INPLACE (this);
const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input);
const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
unsigned int count = lookup.len;
for (unsigned int i = 0; i < count; i++)
if (!c->recurse (lookup.array[i].lookupListIndex))
return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
inline void closure (hb_closure_context_t *c) const
{
TRACE_CLOSURE (this);

22
src/hb-ot-layout-private.hh
View File

@ -189,6 +189,23 @@ static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) {
}
/*
* GSUBGPOS
*/
/* Always returns true for GPOS, but make writing code easier. */
HB_INTERNAL bool
hb_ot_layout_lookup_is_inplace (hb_face_t *face,
hb_tag_t table_tag,
unsigned int lookup_index);
/*
* GSUB
*/
HB_INTERNAL hb_bool_t
hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
unsigned int lookup_index,
@ -215,6 +232,11 @@ hb_ot_layout_substitute_finish (hb_font_t *font,
hb_buffer_t *buffer);
/*
* GPOS
*/
/* Should be called before all the position_lookup's are done. Resets positions to zero. */
HB_INTERNAL void
hb_ot_layout_position_start (hb_font_t *font,

28
src/hb-ot-layout.cc
View File

@ -651,6 +651,33 @@ hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
}
/*
* GSUBGPOS
*/
bool
hb_ot_layout_lookup_is_inplace (hb_face_t *face,
hb_tag_t table_tag,
unsigned int lookup_index)
{
OT::hb_is_inplace_context_t c (face);
switch (table_tag)
{
case HB_OT_TAG_GSUB:
{
const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index);
return l.is_inplace (&c);
}
default:
case HB_OT_TAG_GPOS:
{
return true;
}
}
}
/*
* OT::GSUB
*/
@ -727,6 +754,7 @@ hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
l.closure (&c);
}
/*
* OT::GPOS
*/