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/*
* Copyright © 2007,2008,2009 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_COMMON_PRIVATE_HH
#define HB_OT_LAYOUT_COMMON_PRIVATE_HH
#include "hb-private.hh"
#include "hb-ot-layout-private.hh"
#include "hb-open-type-private.hh"
#include "hb-set-private.hh"
#ifndef HB_MAX_NESTING_LEVEL
#define HB_MAX_NESTING_LEVEL 6
#endif
#ifndef HB_MAX_CONTEXT_LENGTH
#define HB_MAX_CONTEXT_LENGTH 64
#endif
#ifndef HB_CLOSURE_MAX_STAGES
/*
* The maximum number of times a lookup can be applied during shaping.
* Used to limit the number of iterations of the closure algorithm.
* This must be larger than the number of times add_pause() is
* called in a collect_features call of any shaper.
*/
#define HB_CLOSURE_MAX_STAGES 32
#endif
namespace OT {
#define NOT_COVERED ((unsigned int) -1)
/*
*
* OpenType Layout Common Table Formats
*
*/
/*
* Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
*/
template <typename Type>
struct Record
{
inline int cmp (hb_tag_t a) const {
return tag.cmp (a);
}
struct sanitize_closure_t {
hb_tag_t tag;
const void *list_base;
};
inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
const sanitize_closure_t closure = {tag, base};
return_trace (c->check_struct (this) && offset.sanitize (c, base, &closure));
}
Tag tag; /* 4-byte Tag identifier */
OffsetTo<Type>
offset; /* Offset from beginning of object holding
* the Record */
public:
DEFINE_SIZE_STATIC (6);
};
template <typename Type>
struct RecordArrayOf : SortedArrayOf<Record<Type> > {
inline const Tag& get_tag (unsigned int i) const
{
/* We cheat slightly and don't define separate Null objects
* for Record types. Instead, we return the correct Null(Tag)
* here. */
if (unlikely (i >= this->len)) return Null(Tag);
return (*this)[i].tag;
}
inline unsigned int get_tags (unsigned int start_offset,
unsigned int *record_count /* IN/OUT */,
hb_tag_t *record_tags /* OUT */) const
{
if (record_count) {
const Record<Type> *arr = this->sub_array (start_offset, record_count);
unsigned int count = *record_count;
for (unsigned int i = 0; i < count; i++)
record_tags[i] = arr[i].tag;
}
return this->len;
}
inline bool find_index (hb_tag_t tag, unsigned int *index) const
{
/* If we want to allow non-sorted data, we can lsearch(). */
int i = this->/*lsearch*/bsearch (tag);
if (i != -1) {
if (index) *index = i;
return true;
} else {
if (index) *index = Index::NOT_FOUND_INDEX;
return false;
}
}
};
template <typename Type>
struct RecordListOf : RecordArrayOf<Type>
{
inline const Type& operator [] (unsigned int i) const
{ return this+RecordArrayOf<Type>::operator [](i).offset; }
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (RecordArrayOf<Type>::sanitize (c, this));
}
};
struct RangeRecord
{
inline int cmp (hb_codepoint_t g) const {
return g < start ? -1 : g <= end ? 0 : +1 ;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
inline bool intersects (const hb_set_t *glyphs) const {
return glyphs->intersects (start, end);
}
template <typename set_t>
inline bool add_coverage (set_t *glyphs) const {
return glyphs->add_range (start, end);
}
GlyphID start; /* First GlyphID in the range */
GlyphID end; /* Last GlyphID in the range */
HBUINT16 value; /* Value */
public:
DEFINE_SIZE_STATIC (6);
};
DECLARE_NULL_NAMESPACE_BYTES (OT, RangeRecord);
struct IndexArray : ArrayOf<Index>
{
inline unsigned int get_indexes (unsigned int start_offset,
unsigned int *_count /* IN/OUT */,
unsigned int *_indexes /* OUT */) const
{
if (_count) {
const HBUINT16 *arr = this->sub_array (start_offset, _count);
unsigned int count = *_count;
for (unsigned int i = 0; i < count; i++)
_indexes[i] = arr[i];
}
return this->len;
}
inline void add_indexes_to (hb_set_t* output /* OUT */) const
{
output->add_array (arrayZ, len);
}
};
struct Script;
struct LangSys;
struct Feature;
struct LangSys
{
inline unsigned int get_feature_count (void) const
{ return featureIndex.len; }
inline hb_tag_t get_feature_index (unsigned int i) const
{ return featureIndex[i]; }
inline unsigned int get_feature_indexes (unsigned int start_offset,
unsigned int *feature_count /* IN/OUT */,
unsigned int *feature_indexes /* OUT */) const
{ return featureIndex.get_indexes (start_offset, feature_count, feature_indexes); }
inline void add_feature_indexes_to (hb_set_t *feature_indexes) const
{ featureIndex.add_indexes_to (feature_indexes); }
inline bool has_required_feature (void) const { return reqFeatureIndex != 0xFFFFu; }
inline unsigned int get_required_feature_index (void) const
{
if (reqFeatureIndex == 0xFFFFu)
return Index::NOT_FOUND_INDEX;
return reqFeatureIndex;;
}
inline bool sanitize (hb_sanitize_context_t *c,
const Record<LangSys>::sanitize_closure_t * = nullptr) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && featureIndex.sanitize (c));
}
Offset16 lookupOrderZ; /* = Null (reserved for an offset to a
* reordering table) */
HBUINT16 reqFeatureIndex;/* Index of a feature required for this
* language system--if no required features
* = 0xFFFFu */
IndexArray featureIndex; /* Array of indices into the FeatureList */
public:
DEFINE_SIZE_ARRAY (6, featureIndex);
};
DECLARE_NULL_NAMESPACE_BYTES (OT, LangSys);
struct Script
{
inline unsigned int get_lang_sys_count (void) const
{ return langSys.len; }
inline const Tag& get_lang_sys_tag (unsigned int i) const
{ return langSys.get_tag (i); }
inline unsigned int get_lang_sys_tags (unsigned int start_offset,
unsigned int *lang_sys_count /* IN/OUT */,
hb_tag_t *lang_sys_tags /* OUT */) const
{ return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
inline const LangSys& get_lang_sys (unsigned int i) const
{
if (i == Index::NOT_FOUND_INDEX) return get_default_lang_sys ();
return this+langSys[i].offset;
}
inline bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
{ return langSys.find_index (tag, index); }
inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
inline bool sanitize (hb_sanitize_context_t *c,
const Record<Script>::sanitize_closure_t * = nullptr) const
{
TRACE_SANITIZE (this);
return_trace (defaultLangSys.sanitize (c, this) && langSys.sanitize (c, this));
}
protected:
OffsetTo<LangSys>
defaultLangSys; /* Offset to DefaultLangSys table--from
* beginning of Script table--may be Null */
RecordArrayOf<LangSys>
langSys; /* Array of LangSysRecords--listed
* alphabetically by LangSysTag */
public:
DEFINE_SIZE_ARRAY (4, langSys);
};
typedef RecordListOf<Script> ScriptList;
/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#size */
struct FeatureParamsSize
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (unlikely (!c->check_struct (this))) return_trace (false);
/* This subtable has some "history", if you will. Some earlier versions of
* Adobe tools calculated the offset of the FeatureParams sutable from the
* beginning of the FeatureList table! Now, that is dealt with in the
* Feature implementation. But we still need to be able to tell junk from
* real data. Note: We don't check that the nameID actually exists.
*
* Read Roberts wrote on 9/15/06 on opentype-list@indx.co.uk :
*
* Yes, it is correct that a new version of the AFDKO (version 2.0) will be
* coming out soon, and that the makeotf program will build a font with a
* 'size' feature that is correct by the specification.
*
* The specification for this feature tag is in the "OpenType Layout Tag
* Registry". You can see a copy of this at:
* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#tag-size
*
* Here is one set of rules to determine if the 'size' feature is built
* correctly, or as by the older versions of MakeOTF. You may be able to do
* better.
*
* Assume that the offset to the size feature is according to specification,
* and make the following value checks. If it fails, assume the size
* feature is calculated as versions of MakeOTF before the AFDKO 2.0 built it.
* If this fails, reject the 'size' feature. The older makeOTF's calculated the
* offset from the beginning of the FeatureList table, rather than from the
* beginning of the 'size' Feature table.
*
* If "design size" == 0:
* fails check
*
* Else if ("subfamily identifier" == 0 and
* "range start" == 0 and
* "range end" == 0 and
* "range start" == 0 and
* "menu name ID" == 0)
* passes check: this is the format used when there is a design size
* specified, but there is no recommended size range.
*
* Else if ("design size" < "range start" or
* "design size" > "range end" or
* "range end" <= "range start" or
* "menu name ID" < 256 or
* "menu name ID" > 32767 or
* menu name ID is not a name ID which is actually in the name table)
* fails test
* Else
* passes test.
*/
if (!designSize)
return_trace (false);
else if (subfamilyID == 0 &&
subfamilyNameID == 0 &&
rangeStart == 0 &&
rangeEnd == 0)
return_trace (true);
else if (designSize < rangeStart ||
designSize > rangeEnd ||
subfamilyNameID < 256 ||
subfamilyNameID > 32767)
return_trace (false);
else
return_trace (true);
}
HBUINT16 designSize; /* Represents the design size in 720/inch
* units (decipoints). The design size entry
* must be non-zero. When there is a design
* size but no recommended size range, the
* rest of the array will consist of zeros. */
HBUINT16 subfamilyID; /* Has no independent meaning, but serves
* as an identifier that associates fonts
* in a subfamily. All fonts which share a
* Preferred or Font Family name and which
* differ only by size range shall have the
* same subfamily value, and no fonts which
* differ in weight or style shall have the
* same subfamily value. If this value is
* zero, the remaining fields in the array
* will be ignored. */
HBUINT16 subfamilyNameID;/* If the preceding value is non-zero, this
* value must be set in the range 256 - 32767
* (inclusive). It records the value of a
* field in the name table, which must
* contain English-language strings encoded
* in Windows Unicode and Macintosh Roman,
* and may contain additional strings
* localized to other scripts and languages.
* Each of these strings is the name an
* application should use, in combination
* with the family name, to represent the
* subfamily in a menu. Applications will
* choose the appropriate version based on
* their selection criteria. */
HBUINT16 rangeStart; /* Large end of the recommended usage range
* (inclusive), stored in 720/inch units
* (decipoints). */
HBUINT16 rangeEnd; /* Small end of the recommended usage range
(exclusive), stored in 720/inch units
* (decipoints). */
public:
DEFINE_SIZE_STATIC (10);
};
/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#ssxx */
struct FeatureParamsStylisticSet
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
/* Right now minorVersion is at zero. Which means, any table supports
* the uiNameID field. */
return_trace (c->check_struct (this));
}
HBUINT16 version; /* (set to 0): This corresponds to a “minor”
* version number. Additional data may be
* added to the end of this Feature Parameters
* table in the future. */
NameID uiNameID; /* The 'name' table name ID that specifies a
* string (or strings, for multiple languages)
* for a user-interface label for this
* feature. The values of uiLabelNameId and
* sampleTextNameId are expected to be in the
* font-specific name ID range (256-32767),
* though that is not a requirement in this
* Feature Parameters specification. The
* user-interface label for the feature can
* be provided in multiple languages. An
* English string should be included as a
* fallback. The string should be kept to a
* minimal length to fit comfortably with
* different application interfaces. */
public:
DEFINE_SIZE_STATIC (4);
};
/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#cv01-cv99 */
struct FeatureParamsCharacterVariants
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
characters.sanitize (c));
}
HBUINT16 format; /* Format number is set to 0. */
NameID featUILableNameID; /* The ‘name’ table name ID that
* specifies a string (or strings,
* for multiple languages) for a
* user-interface label for this
* feature. (May be nullptr.) */
NameID featUITooltipTextNameID;/* The ‘name’ table name ID that
* specifies a string (or strings,
* for multiple languages) that an
* application can use for tooltip
* text for this feature. (May be
* nullptr.) */
NameID sampleTextNameID; /* The ‘name’ table name ID that
* specifies sample text that
* illustrates the effect of this
* feature. (May be nullptr.) */
HBUINT16 numNamedParameters; /* Number of named parameters. (May
* be zero.) */
NameID firstParamUILabelNameID;/* The first ‘name’ table name ID
* used to specify strings for
* user-interface labels for the
* feature parameters. (Must be zero
* if numParameters is zero.) */
ArrayOf<HBUINT24>
characters; /* Array of the Unicode Scalar Value
* of the characters for which this
* feature provides glyph variants.
* (May be zero.) */
public:
DEFINE_SIZE_ARRAY (14, characters);
};
struct FeatureParams
{
inline bool sanitize (hb_sanitize_context_t *c, hb_tag_t tag) const
{
TRACE_SANITIZE (this);
if (tag == HB_TAG ('s','i','z','e'))
return_trace (u.size.sanitize (c));
if ((tag & 0xFFFF0000u) == HB_TAG ('s','s','\0','\0')) /* ssXX */
return_trace (u.stylisticSet.sanitize (c));
if ((tag & 0xFFFF0000u) == HB_TAG ('c','v','\0','\0')) /* cvXX */
return_trace (u.characterVariants.sanitize (c));
return_trace (true);
}
inline const FeatureParamsSize& get_size_params (hb_tag_t tag) const
{
if (tag == HB_TAG ('s','i','z','e'))
return u.size;
return Null(FeatureParamsSize);
}
private:
union {
FeatureParamsSize size;
FeatureParamsStylisticSet stylisticSet;
FeatureParamsCharacterVariants characterVariants;
} u;
DEFINE_SIZE_STATIC (17);
};
struct Feature
{
inline unsigned int get_lookup_count (void) const
{ return lookupIndex.len; }
inline hb_tag_t get_lookup_index (unsigned int i) const
{ return lookupIndex[i]; }
inline unsigned int get_lookup_indexes (unsigned int start_index,
unsigned int *lookup_count /* IN/OUT */,
unsigned int *lookup_tags /* OUT */) const
{ return lookupIndex.get_indexes (start_index, lookup_count, lookup_tags); }
inline const FeatureParams &get_feature_params (void) const
{ return this+featureParams; }
inline bool sanitize (hb_sanitize_context_t *c,
const Record<Feature>::sanitize_closure_t *closure = nullptr) const
{
TRACE_SANITIZE (this);
if (unlikely (!(c->check_struct (this) && lookupIndex.sanitize (c))))
return_trace (false);
/* Some earlier versions of Adobe tools calculated the offset of the
* FeatureParams subtable from the beginning of the FeatureList table!
*
* If sanitizing "failed" for the FeatureParams subtable, try it with the
* alternative location. We would know sanitize "failed" if old value
* of the offset was non-zero, but it's zeroed now.
*
* Only do this for the 'size' feature, since at the time of the faulty
* Adobe tools, only the 'size' feature had FeatureParams defined.
*/
OffsetTo<FeatureParams> orig_offset = featureParams;
if (unlikely (!featureParams.sanitize (c, this, closure ? closure->tag : HB_TAG_NONE)))
return_trace (false);
if (likely (orig_offset.is_null ()))
return_trace (true);
if (featureParams == 0 && closure &&
closure->tag == HB_TAG ('s','i','z','e') &&
closure->list_base && closure->list_base < this)
{
unsigned int new_offset_int = (unsigned int) orig_offset -
(((char *) this) - ((char *) closure->list_base));
OffsetTo<FeatureParams> new_offset;
/* Check that it did not overflow. */
new_offset.set (new_offset_int);
if (new_offset == new_offset_int &&
c->try_set (&featureParams, new_offset) &&
!featureParams.sanitize (c, this, closure ? closure->tag : HB_TAG_NONE))
return_trace (false);
}
return_trace (true);
}
OffsetTo<FeatureParams>
featureParams; /* Offset to Feature Parameters table (if one
* has been defined for the feature), relative
* to the beginning of the Feature Table; = Null
* if not required */
IndexArray lookupIndex; /* Array of LookupList indices */
public:
DEFINE_SIZE_ARRAY (4, lookupIndex);
};
typedef RecordListOf<Feature> FeatureList;
struct LookupFlag : HBUINT16
{
enum Flags {
RightToLeft = 0x0001u,
IgnoreBaseGlyphs = 0x0002u,
IgnoreLigatures = 0x0004u,
IgnoreMarks = 0x0008u,
IgnoreFlags = 0x000Eu,
UseMarkFilteringSet = 0x0010u,
Reserved = 0x00E0u,
MarkAttachmentType = 0xFF00u
};
public:
DEFINE_SIZE_STATIC (2);
};
} /* namespace OT */
/* This has to be outside the namespace. */
HB_MARK_AS_FLAG_T (OT::LookupFlag::Flags);
namespace OT {
struct Lookup
{
inline unsigned int get_subtable_count (void) const { return subTable.len; }
template <typename SubTableType>
inline const SubTableType& get_subtable (unsigned int i) const
{ return this+CastR<OffsetArrayOf<SubTableType> > (subTable)[i]; }
template <typename SubTableType>
inline const OffsetArrayOf<SubTableType>& get_subtables (void) const
{ return CastR<OffsetArrayOf<SubTableType> > (subTable); }
template <typename SubTableType>
inline OffsetArrayOf<SubTableType>& get_subtables (void)
{ return CastR<OffsetArrayOf<SubTableType> > (subTable); }
inline unsigned int get_size (void) const
{
const HBUINT16 &markFilteringSet = StructAfter<const HBUINT16> (subTable);
if (lookupFlag & LookupFlag::UseMarkFilteringSet)
return (const char *) &StructAfter<const char> (markFilteringSet) - (const char *) this;
return (const char *) &markFilteringSet - (const char *) this;
}
inline unsigned int get_type (void) const { return lookupType; }
/* lookup_props is a 32-bit integer where the lower 16-bit is LookupFlag and
* higher 16-bit is mark-filtering-set if the lookup uses one.
* Not to be confused with glyph_props which is very similar. */
inline uint32_t get_props (void) const
{
unsigned int flag = lookupFlag;
if (unlikely (flag & LookupFlag::UseMarkFilteringSet))
{
const HBUINT16 &markFilteringSet = StructAfter<HBUINT16> (subTable);
flag += (markFilteringSet << 16);
}
return flag;
}
template <typename SubTableType, typename context_t>
inline typename context_t::return_t dispatch (context_t *c) const
{
unsigned int lookup_type = get_type ();
TRACE_DISPATCH (this, lookup_type);
unsigned int count = get_subtable_count ();
for (unsigned int i = 0; i < count; i++) {
typename context_t::return_t r = get_subtable<SubTableType> (i).dispatch (c, lookup_type);
if (c->stop_sublookup_iteration (r))
return_trace (r);
}
return_trace (c->default_return_value ());
}
inline bool serialize (hb_serialize_context_t *c,
unsigned int lookup_type,
uint32_t lookup_props,
unsigned int num_subtables)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (*this))) return_trace (false);
lookupType.set (lookup_type);
lookupFlag.set (lookup_props & 0xFFFFu);
if (unlikely (!subTable.serialize (c, num_subtables))) return_trace (false);
if (lookupFlag & LookupFlag::UseMarkFilteringSet)
{
if (unlikely (!c->extend (*this))) return_trace (false);
HBUINT16 &markFilteringSet = StructAfter<HBUINT16> (subTable);
markFilteringSet.set (lookup_props >> 16);
}
return_trace (true);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
/* Real sanitize of the subtables is done by GSUB/GPOS/... */
if (!(c->check_struct (this) && subTable.sanitize (c))) return_trace (false);
if (lookupFlag & LookupFlag::UseMarkFilteringSet)
{
const HBUINT16 &markFilteringSet = StructAfter<HBUINT16> (subTable);
if (!markFilteringSet.sanitize (c)) return_trace (false);
}
return_trace (true);
}
private:
HBUINT16 lookupType; /* Different enumerations for GSUB and GPOS */
HBUINT16 lookupFlag; /* Lookup qualifiers */
ArrayOf<Offset16>
subTable; /* Array of SubTables */
HBUINT16 markFilteringSetX[VAR]; /* Index (base 0) into GDEF mark glyph sets
* structure. This field is only present if bit
* UseMarkFilteringSet of lookup flags is set. */
public:
DEFINE_SIZE_ARRAY2 (6, subTable, markFilteringSetX);
};
typedef OffsetListOf<Lookup> LookupList;
/*
* Coverage Table
*/
struct CoverageFormat1
{
friend struct Coverage;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
{
int i = glyphArray.bsearch (glyph_id);
static_assert ((((unsigned int) -1) == NOT_COVERED), "");
return i;
}
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 (false);
glyphArray.len.set (num_glyphs);
if (unlikely (!c->extend (glyphArray))) return_trace (false);
for (unsigned int i = 0; i < num_glyphs; i++)
glyphArray[i] = glyphs[i];
glyphs += num_glyphs;
return_trace (true);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (glyphArray.sanitize (c));
}
inline bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const {
return glyphs->has (glyphArray[index]);
}
template <typename set_t>
inline bool add_coverage (set_t *glyphs) const {
return glyphs->add_sorted_array (glyphArray.arrayZ, glyphArray.len);
}
public:
/* Older compilers need this to be public. */
struct Iter {
inline void init (const struct CoverageFormat1 &c_) { c = &c_; i = 0; };
inline bool more (void) { return i < c->glyphArray.len; }
inline void next (void) { i++; }
inline hb_codepoint_t get_glyph (void) { return c->glyphArray[i]; }
inline unsigned int get_coverage (void) { return i; }
private:
const struct CoverageFormat1 *c;
unsigned int i;
};
private:
protected:
HBUINT16 coverageFormat; /* Format identifier--format = 1 */
SortedArrayOf<GlyphID>
glyphArray; /* Array of GlyphIDs--in numerical order */
public:
DEFINE_SIZE_ARRAY (4, glyphArray);
};
struct CoverageFormat2
{
friend struct Coverage;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
{
int i = rangeRecord.bsearch (glyph_id);
if (i != -1) {
const RangeRecord &range = rangeRecord[i];
return (unsigned int) range.value + (glyph_id - range.start);
}
return NOT_COVERED;
}
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 (false);
if (unlikely (!num_glyphs))
{
rangeRecord.len.set (0);
return_trace (true);
}
unsigned int num_ranges = 1;
for (unsigned int i = 1; i < num_glyphs; i++)
if (glyphs[i - 1] + 1 != glyphs[i])
num_ranges++;
rangeRecord.len.set (num_ranges);
if (unlikely (!c->extend (rangeRecord))) return_trace (false);
unsigned int range = 0;
rangeRecord[range].start = glyphs[0];
rangeRecord[range].value.set (0);
for (unsigned int i = 1; i < num_glyphs; i++)
if (glyphs[i - 1] + 1 != glyphs[i]) {
range++;
rangeRecord[range].start = glyphs[i];
rangeRecord[range].value.set (i);
rangeRecord[range].end = glyphs[i];
} else {
rangeRecord[range].end = glyphs[i];
}
glyphs += num_glyphs;
return_trace (true);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (rangeRecord.sanitize (c));
}
inline bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const {
unsigned int i;
unsigned int count = rangeRecord.len;
for (i = 0; i < count; i++) {
const RangeRecord &range = rangeRecord[i];
if (range.value <= index &&
index < (unsigned int) range.value + (range.end - range.start) &&
range.intersects (glyphs))
return true;
else if (index < range.value)
return false;
}
return false;
}
template <typename set_t>
inline bool add_coverage (set_t *glyphs) const {
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
if (unlikely (!rangeRecord[i].add_coverage (glyphs)))
return false;
return true;
}
public:
/* Older compilers need this to be public. */
struct Iter
{
inline void init (const CoverageFormat2 &c_)
{
c = &c_;
coverage = 0;
i = 0;
j = c->rangeRecord.len ? c->rangeRecord[0].start : 0;
if (unlikely (c->rangeRecord[0].start > c->rangeRecord[0].end))
{
/* Broken table. Skip. */
i = c->rangeRecord.len;
}
}
inline bool more (void) { return i < c->rangeRecord.len; }
inline void next (void)
{
if (j >= c->rangeRecord[i].end)
{
i++;
if (more ())
{
hb_codepoint_t old = j;
j = c->rangeRecord[i].start;
if (unlikely (j <= old))
{
/* Broken table. Skip. Important to avoid DoS. */
i = c->rangeRecord.len;
return;
}
coverage = c->rangeRecord[i].value;
}
return;
}
coverage++;
j++;
}
inline hb_codepoint_t get_glyph (void) { return j; }
inline unsigned int get_coverage (void) { return coverage; }
private:
const struct CoverageFormat2 *c;
unsigned int i, coverage;
hb_codepoint_t j;
};
private:
protected:
HBUINT16 coverageFormat; /* Format identifier--format = 2 */
SortedArrayOf<RangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID. rangeCount entries
* long */
public:
DEFINE_SIZE_ARRAY (4, rangeRecord);
};
struct Coverage
{
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
{
switch (u.format) {
case 1: return u.format1.get_coverage (glyph_id);
case 2: return u.format2.get_coverage (glyph_id);
default:return NOT_COVERED;
}
}
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 (false);
unsigned int num_ranges = 1;
for (unsigned int i = 1; i < num_glyphs; i++)
if (glyphs[i - 1] + 1 != glyphs[i])
num_ranges++;
u.format.set (num_glyphs * 2 < num_ranges * 3 ? 1 : 2);
switch (u.format) {
case 1: return_trace (u.format1.serialize (c, glyphs, num_glyphs));
case 2: return_trace (u.format2.serialize (c, glyphs, num_glyphs));
default:return_trace (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
switch (u.format) {
case 1: return_trace (u.format1.sanitize (c));
case 2: return_trace (u.format2.sanitize (c));
default:return_trace (true);
}
}
inline bool intersects (const hb_set_t *glyphs) const {
/* TODO speed this up */
Coverage::Iter iter;
for (iter.init (*this); iter.more (); iter.next ()) {
if (glyphs->has (iter.get_glyph ()))
return true;
}
return false;
}
inline bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const {
switch (u.format) {
case 1: return u.format1.intersects_coverage (glyphs, index);
case 2: return u.format2.intersects_coverage (glyphs, index);
default:return false;
}
}
/* Might return false if array looks unsorted.
* Used for faster rejection of corrupt data. */
template <typename set_t>
inline bool add_coverage (set_t *glyphs) const {
switch (u.format) {
case 1: return u.format1.add_coverage (glyphs);
case 2: return u.format2.add_coverage (glyphs);
default:return false;
}
}
struct Iter {
Iter (void) : format (0), u () {};
inline void init (const Coverage &c_) {
format = c_.u.format;
switch (format) {
case 1: u.format1.init (c_.u.format1); return;
case 2: u.format2.init (c_.u.format2); return;
default: return;
}
}
inline bool more (void) {
switch (format) {
case 1: return u.format1.more ();
case 2: return u.format2.more ();
default:return false;
}
}
inline void next (void) {
switch (format) {
case 1: u.format1.next (); break;
case 2: u.format2.next (); break;
default: break;
}
}
inline hb_codepoint_t get_glyph (void) {
switch (format) {
case 1: return u.format1.get_glyph ();
case 2: return u.format2.get_glyph ();
default:return 0;
}
}
inline unsigned int get_coverage (void) {
switch (format) {
case 1: return u.format1.get_coverage ();
case 2: return u.format2.get_coverage ();
default:return -1;
}
}
private:
unsigned int format;
union {
CoverageFormat2::Iter format2; /* Put this one first since it's larger; helps shut up compiler. */
CoverageFormat1::Iter format1;
} u;
};
protected:
union {
HBUINT16 format; /* Format identifier */
CoverageFormat1 format1;
CoverageFormat2 format2;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
/*
* Class Definition Table
*/
struct ClassDefFormat1
{
friend struct ClassDef;
private:
inline unsigned int get_class (hb_codepoint_t glyph_id) const
{
unsigned int i = (unsigned int) (glyph_id - startGlyph);
if (unlikely (i < classValue.len))
return classValue[i];
return 0;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && classValue.sanitize (c));
}
template <typename set_t>
inline bool add_coverage (set_t *glyphs) const {
unsigned int start = 0;
unsigned int count = classValue.len;
for (unsigned int i = 0; i < count; i++)
{
if (classValue[i])
continue;
if (start != i)
if (unlikely (!glyphs->add_range (startGlyph + start, startGlyph + i)))
return false;
start = i + 1;
}
if (start != count)
if (unlikely (!glyphs->add_range (startGlyph + start, startGlyph + count)))
return false;
return true;
}
template <typename set_t>
inline bool add_class (set_t *glyphs, unsigned int klass) const {
unsigned int count = classValue.len;
for (unsigned int i = 0; i < count; i++)
{
if (classValue[i] == klass)
glyphs->add (startGlyph + i);
}
return true;
}
inline bool intersects_class (const hb_set_t *glyphs, unsigned int klass) const {
unsigned int count = classValue.len;
if (klass == 0)
{
/* Match if there's any glyph that is not listed! */
hb_codepoint_t g = HB_SET_VALUE_INVALID;
if (!hb_set_next (glyphs, &g))
return false;
if (g < startGlyph)
return true;
g = startGlyph + count - 1;
if (hb_set_next (glyphs, &g))
return true;
/* Fall through. */
}
for (unsigned int i = 0; i < count; i++)
if (classValue[i] == klass && glyphs->has (startGlyph + i))
return true;
return false;
}
protected:
HBUINT16 classFormat; /* Format identifier--format = 1 */
GlyphID startGlyph; /* First GlyphID of the classValueArray */
ArrayOf<HBUINT16>
classValue; /* Array of Class Values--one per GlyphID */
public:
DEFINE_SIZE_ARRAY (6, classValue);
};
struct ClassDefFormat2
{
friend struct ClassDef;
private:
inline unsigned int get_class (hb_codepoint_t glyph_id) const
{
int i = rangeRecord.bsearch (glyph_id);
if (unlikely (i != -1))
return rangeRecord[i].value;
return 0;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (rangeRecord.sanitize (c));
}
template <typename set_t>
inline bool add_coverage (set_t *glyphs) const {
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
if (rangeRecord[i].value)
if (unlikely (!rangeRecord[i].add_coverage (glyphs)))
return false;
return true;
}
template <typename set_t>
inline bool add_class (set_t *glyphs, unsigned int klass) const {
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
{
if (rangeRecord[i].value == klass)
if (unlikely (!rangeRecord[i].add_coverage (glyphs)))
return false;
}
return true;
}
inline bool intersects_class (const hb_set_t *glyphs, unsigned int klass) const {
unsigned int count = rangeRecord.len;
if (klass == 0)
{
/* Match if there's any glyph that is not listed! */
hb_codepoint_t g = HB_SET_VALUE_INVALID;
for (unsigned int i = 0; i < count; i++)
{
if (!hb_set_next (glyphs, &g))
break;
if (g < rangeRecord[i].start)
return true;
g = rangeRecord[i].end;
}
if (g != HB_SET_VALUE_INVALID && hb_set_next (glyphs, &g))
return true;
/* Fall through. */
}
for (unsigned int i = 0; i < count; i++)
if (rangeRecord[i].value == klass && rangeRecord[i].intersects (glyphs))
return true;
return false;
}
protected:
HBUINT16 classFormat; /* Format identifier--format = 2 */
SortedArrayOf<RangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID */
public:
DEFINE_SIZE_ARRAY (4, rangeRecord);
};
struct ClassDef
{
inline unsigned int get_class (hb_codepoint_t glyph_id) const
{
switch (u.format) {
case 1: return u.format1.get_class (glyph_id);
case 2: return u.format2.get_class (glyph_id);
default:return 0;
}
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
switch (u.format) {
case 1: return_trace (u.format1.sanitize (c));
case 2: return_trace (u.format2.sanitize (c));
default:return_trace (true);
}
}
/* Might return false if array looks unsorted.
* Used for faster rejection of corrupt data. */
template <typename set_t>
inline bool add_coverage (set_t *glyphs) const {
switch (u.format) {
case 1: return u.format1.add_coverage (glyphs);
case 2: return u.format2.add_coverage (glyphs);
default:return false;
}
}
/* Might return false if array looks unsorted.
* Used for faster rejection of corrupt data. */
template <typename set_t>
inline bool add_class (set_t *glyphs, unsigned int klass) const {
switch (u.format) {
case 1: return u.format1.add_class (glyphs, klass);
case 2: return u.format2.add_class (glyphs, klass);
default:return false;
}
}
inline bool intersects_class (const hb_set_t *glyphs, unsigned int klass) const {
switch (u.format) {
case 1: return u.format1.intersects_class (glyphs, klass);
case 2: return u.format2.intersects_class (glyphs, klass);
default:return false;
}
}
protected:
union {
HBUINT16 format; /* Format identifier */
ClassDefFormat1 format1;
ClassDefFormat2 format2;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
/*
* Item Variation Store
*/
struct VarRegionAxis
{
inline float evaluate (int coord) const
{
int start = startCoord, peak = peakCoord, end = endCoord;
/* TODO Move these to sanitize(). */
if (unlikely (start > peak || peak > end))
return 1.;
if (unlikely (start < 0 && end > 0 && peak != 0))
return 1.;
if (peak == 0 || coord == peak)
return 1.;
if (coord <= start || end <= coord)
return 0.;
/* Interpolate */
if (coord < peak)
return float (coord - start) / (peak - start);
else
return float (end - coord) / (end - peak);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
/* TODO Handle invalid start/peak/end configs, so we don't
* have to do that at runtime. */
}
public:
F2DOT14 startCoord;
F2DOT14 peakCoord;
F2DOT14 endCoord;
public:
DEFINE_SIZE_STATIC (6);
};
struct VarRegionList
{
inline float evaluate (unsigned int region_index,
int *coords, unsigned int coord_len) const
{
if (unlikely (region_index >= regionCount))
return 0.;
const VarRegionAxis *axes = axesZ.arrayZ + (region_index * axisCount);
float v = 1.;
unsigned int count = axisCount;
for (unsigned int i = 0; i < count; i++)
{
int coord = i < coord_len ? coords[i] : 0;
float factor = axes[i].evaluate (coord);
if (factor == 0.f)
return 0.;
v *= factor;
}
return v;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
axesZ.sanitize (c, (unsigned int) axisCount * (unsigned int) regionCount));
}
protected:
HBUINT16 axisCount;
HBUINT16 regionCount;
UnsizedArrayOf<VarRegionAxis>
axesZ;
public:
DEFINE_SIZE_ARRAY (4, axesZ);
};
struct VarData
{
inline unsigned int get_row_size (void) const
{ return shortCount + regionIndices.len; }
inline unsigned int get_size (void) const
{ return itemCount * get_row_size (); }
inline float get_delta (unsigned int inner,
int *coords, unsigned int coord_count,
const VarRegionList &regions) const
{
if (unlikely (inner >= itemCount))
return 0.;
unsigned int count = regionIndices.len;
unsigned int scount = shortCount;
const HBUINT8 *bytes = &StructAfter<HBUINT8> (regionIndices);
const HBUINT8 *row = bytes + inner * (scount + count);
float delta = 0.;
unsigned int i = 0;
const HBINT16 *scursor = reinterpret_cast<const HBINT16 *> (row);
for (; i < scount; i++)
{
float scalar = regions.evaluate (regionIndices.arrayZ[i], coords, coord_count);
delta += scalar * *scursor++;
}
const HBINT8 *bcursor = reinterpret_cast<const HBINT8 *> (scursor);
for (; i < count; i++)
{
float scalar = regions.evaluate (regionIndices.arrayZ[i], coords, coord_count);
delta += scalar * *bcursor++;
}
return delta;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
regionIndices.sanitize(c) &&
shortCount <= regionIndices.len &&
c->check_array (&StructAfter<HBUINT8> (regionIndices),
get_row_size (), itemCount));
}
protected:
HBUINT16 itemCount;
HBUINT16 shortCount;
ArrayOf<HBUINT16> regionIndices;
HBUINT8 bytesX[VAR];
public:
DEFINE_SIZE_ARRAY2 (6, regionIndices, bytesX);
};
struct VariationStore
{
inline float get_delta (unsigned int outer, unsigned int inner,
int *coords, unsigned int coord_count) const
{
if (unlikely (outer >= dataSets.len))
return 0.;
return (this+dataSets[outer]).get_delta (inner,
coords, coord_count,
this+regions);
}
inline float get_delta (unsigned int index,
int *coords, unsigned int coord_count) const
{
unsigned int outer = index >> 16;
unsigned int inner = index & 0xFFFF;
return get_delta (outer, inner, coords, coord_count);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
format == 1 &&
regions.sanitize (c, this) &&
dataSets.sanitize (c, this));
}
protected:
HBUINT16 format;
LOffsetTo<VarRegionList> regions;
OffsetArrayOf<VarData, HBUINT32> dataSets;
public:
DEFINE_SIZE_ARRAY (8, dataSets);
};
/*
* Feature Variations
*/
struct ConditionFormat1
{
friend struct Condition;
private:
inline bool evaluate (const int *coords, unsigned int coord_len) const
{
int coord = axisIndex < coord_len ? coords[axisIndex] : 0;
return filterRangeMinValue <= coord && coord <= filterRangeMaxValue;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
protected:
HBUINT16 format; /* Format identifier--format = 1 */
HBUINT16 axisIndex;
F2DOT14 filterRangeMinValue;
F2DOT14 filterRangeMaxValue;
public:
DEFINE_SIZE_STATIC (8);
};
struct Condition
{
inline bool evaluate (const int *coords, unsigned int coord_len) const
{
switch (u.format) {
case 1: return u.format1.evaluate (coords, coord_len);
default:return false;
}
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
switch (u.format) {
case 1: return_trace (u.format1.sanitize (c));
default:return_trace (true);
}
}
protected:
union {
HBUINT16 format; /* Format identifier */
ConditionFormat1 format1;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
struct ConditionSet
{
inline bool evaluate (const int *coords, unsigned int coord_len) const
{
unsigned int count = conditions.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+conditions.arrayZ[i]).evaluate (coords, coord_len))
return false;
return true;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (conditions.sanitize (c, this));
}
protected:
OffsetArrayOf<Condition, HBUINT32> conditions;
public:
DEFINE_SIZE_ARRAY (2, conditions);
};
struct FeatureTableSubstitutionRecord
{
friend struct FeatureTableSubstitution;
inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && feature.sanitize (c, base));
}
protected:
HBUINT16 featureIndex;
LOffsetTo<Feature> feature;
public:
DEFINE_SIZE_STATIC (6);
};
struct FeatureTableSubstitution
{
inline const Feature *find_substitute (unsigned int feature_index) const
{
unsigned int count = substitutions.len;
for (unsigned int i = 0; i < count; i++)
{
const FeatureTableSubstitutionRecord &record = substitutions.arrayZ[i];
if (record.featureIndex == feature_index)
return &(this+record.feature);
}
return nullptr;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (version.sanitize (c) &&
likely (version.major == 1) &&
substitutions.sanitize (c, this));
}
protected:
FixedVersion<> version; /* Version--0x00010000u */
ArrayOf<FeatureTableSubstitutionRecord>
substitutions;
public:
DEFINE_SIZE_ARRAY (6, substitutions);
};
struct FeatureVariationRecord
{
friend struct FeatureVariations;
inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (conditions.sanitize (c, base) &&
substitutions.sanitize (c, base));
}
protected:
LOffsetTo<ConditionSet>
conditions;
LOffsetTo<FeatureTableSubstitution>
substitutions;
public:
DEFINE_SIZE_STATIC (8);
};
struct FeatureVariations
{
static const unsigned int NOT_FOUND_INDEX = 0xFFFFFFFFu;
inline bool find_index (const int *coords, unsigned int coord_len,
unsigned int *index) const
{
unsigned int count = varRecords.len;
for (unsigned int i = 0; i < count; i++)
{
const FeatureVariationRecord &record = varRecords.arrayZ[i];
if ((this+record.conditions).evaluate (coords, coord_len))
{
*index = i;
return true;
}
}
*index = NOT_FOUND_INDEX;
return false;
}
inline const Feature *find_substitute (unsigned int variations_index,
unsigned int feature_index) const
{
const FeatureVariationRecord &record = varRecords[variations_index];
return (this+record.substitutions).find_substitute (feature_index);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (version.sanitize (c) &&
likely (version.major == 1) &&
varRecords.sanitize (c, this));
}
protected:
FixedVersion<> version; /* Version--0x00010000u */
LArrayOf<FeatureVariationRecord>
varRecords;
public:
DEFINE_SIZE_ARRAY (8, varRecords);
};
/*
* Device Tables
*/
struct HintingDevice
{
friend struct Device;
private:
inline hb_position_t get_x_delta (hb_font_t *font) const
{ return get_delta (font->x_ppem, font->x_scale); }
inline hb_position_t get_y_delta (hb_font_t *font) const
{ return get_delta (font->y_ppem, font->y_scale); }
inline unsigned int get_size (void) const
{
unsigned int f = deltaFormat;
if (unlikely (f < 1 || f > 3 || startSize > endSize)) return 3 * HBUINT16::static_size;
return HBUINT16::static_size * (4 + ((endSize - startSize) >> (4 - f)));
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && c->check_range (this, this->get_size ()));
}
private:
inline int get_delta (unsigned int ppem, int scale) const
{
if (!ppem) return 0;
int pixels = get_delta_pixels (ppem);
if (!pixels) return 0;
return (int) (pixels * (int64_t) scale / ppem);
}
inline int get_delta_pixels (unsigned int ppem_size) const
{
unsigned int f = deltaFormat;
if (unlikely (f < 1 || f > 3))
return 0;
if (ppem_size < startSize || ppem_size > endSize)
return 0;
unsigned int s = ppem_size - startSize;
unsigned int byte = deltaValue[s >> (4 - f)];
unsigned int bits = (byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f)));
unsigned int mask = (0xFFFFu >> (16 - (1 << f)));
int delta = bits & mask;
if ((unsigned int) delta >= ((mask + 1) >> 1))
delta -= mask + 1;
return delta;
}
protected:
HBUINT16 startSize; /* Smallest size to correct--in ppem */
HBUINT16 endSize; /* Largest size to correct--in ppem */
HBUINT16 deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3
* 1 Signed 2-bit value, 8 values per uint16
* 2 Signed 4-bit value, 4 values per uint16
* 3 Signed 8-bit value, 2 values per uint16
*/
HBUINT16 deltaValue[VAR]; /* Array of compressed data */
public:
DEFINE_SIZE_ARRAY (6, deltaValue);
};
struct VariationDevice
{
friend struct Device;
private:
inline hb_position_t get_x_delta (hb_font_t *font, const VariationStore &store) const
{ return font->em_scalef_x (get_delta (font, store)); }
inline hb_position_t get_y_delta (hb_font_t *font, const VariationStore &store) const
{ return font->em_scalef_y (get_delta (font, store)); }
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
private:
inline float get_delta (hb_font_t *font, const VariationStore &store) const
{
return store.get_delta (outerIndex, innerIndex, font->coords, font->num_coords);
}
protected:
HBUINT16 outerIndex;
HBUINT16 innerIndex;
HBUINT16 deltaFormat; /* Format identifier for this table: 0x0x8000 */
public:
DEFINE_SIZE_STATIC (6);
};
struct DeviceHeader
{
protected:
HBUINT16 reserved1;
HBUINT16 reserved2;
public:
HBUINT16 format; /* Format identifier */
public:
DEFINE_SIZE_STATIC (6);
};
struct Device
{
inline hb_position_t get_x_delta (hb_font_t *font, const VariationStore &store=Null(VariationStore)) const
{
switch (u.b.format)
{
case 1: case 2: case 3:
return u.hinting.get_x_delta (font);
case 0x8000:
return u.variation.get_x_delta (font, store);
default:
return 0;
}
}
inline hb_position_t get_y_delta (hb_font_t *font, const VariationStore &store=Null(VariationStore)) const
{
switch (u.b.format)
{
case 1: case 2: case 3:
return u.hinting.get_y_delta (font);
case 0x8000:
return u.variation.get_y_delta (font, store);
default:
return 0;
}
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.b.format.sanitize (c)) return_trace (false);
switch (u.b.format) {
case 1: case 2: case 3:
return_trace (u.hinting.sanitize (c));
case 0x8000:
return_trace (u.variation.sanitize (c));
default:
return_trace (true);
}
}
protected:
union {
DeviceHeader b;
HintingDevice hinting;
VariationDevice variation;
} u;
public:
DEFINE_SIZE_UNION (6, b);
};
} /* namespace OT */
#endif /* HB_OT_LAYOUT_COMMON_PRIVATE_HH */
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