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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-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
+
+
+namespace OT {
+
+
+#define TRACE_DISPATCH(this, format) \
+ hb_auto_trace_t<context_t::max_debug_depth, typename context_t::return_t> trace \
+ (&c->debug_depth, c->get_name (), this, HB_FUNC, \
+ "format %d", (int) format);
+
+
+#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 void add_coverage (set_t *glyphs) const {
+ glyphs->add_range (start, end);
+ }
+
+ GlyphID start; /* First GlyphID in the range */
+ GlyphID end; /* Last GlyphID in the range */
+ USHORT value; /* Value */
+ public:
+ DEFINE_SIZE_STATIC (6);
+};
+DEFINE_NULL_DATA (RangeRecord, "\000\001");
+
+
+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 USHORT *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;
+ }
+};
+
+
+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 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 * = NULL) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) && featureIndex.sanitize (c));
+ }
+
+ Offset<> lookupOrderZ; /* = Null (reserved for an offset to a
+ * reordering table) */
+ USHORT 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);
+};
+DEFINE_NULL_DATA (LangSys, "\0\0\xFF\xFF");
+
+
+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 * = NULL) 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;
+
+
+/* http://www.microsoft.com/typography/otspec/features_pt.htm#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:
+ * http://partners.adobe.com/public/developer/opentype/index_tag8.html#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 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);
+ }
+
+ USHORT 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. */
+ USHORT 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. */
+ USHORT 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. */
+ USHORT rangeStart; /* Large end of the recommended usage range
+ * (inclusive), stored in 720/inch units
+ * (decipoints). */
+ USHORT rangeEnd; /* Small end of the recommended usage range
+ (exclusive), stored in 720/inch units
+ * (decipoints). */
+ public:
+ DEFINE_SIZE_STATIC (10);
+};
+
+/* http://www.microsoft.com/typography/otspec/features_pt.htm#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));
+ }
+
+ USHORT 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. */
+
+ USHORT 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);
+};
+
+/* http://www.microsoft.com/typography/otspec/features_ae.htm#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));
+ }
+
+ USHORT format; /* Format number is set to 0. */
+ USHORT 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 NULL.) */
+ USHORT 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
+ * NULL.) */
+ USHORT sampleTextNameID; /* The ‘name’ table name ID that
+ * specifies sample text that
+ * illustrates the effect of this
+ * feature. (May be NULL.) */
+ USHORT numNamedParameters; /* Number of named parameters. (May
+ * be zero.) */
+ USHORT 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<UINT24>
+ 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 = NULL) 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);
+
+ if (c->edit_count > 1)
+ c->edit_count--; /* This was a "legitimate" edit; don't contribute to error count. */
+ }
+
+ 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 : USHORT
+{
+ 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_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 USHORT &markFilteringSet = StructAfter<USHORT> (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)
+ {
+ USHORT &markFilteringSet = StructAfter<USHORT> (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 USHORT &markFilteringSet = StructAfter<USHORT> (subTable);
+ if (!markFilteringSet.sanitize (c)) return_trace (false);
+ }
+ return_trace (true);
+ }
+
+ private:
+ USHORT lookupType; /* Different enumerations for GSUB and GPOS */
+ USHORT lookupFlag; /* Lookup qualifiers */
+ ArrayOf<Offset<> >
+ subTable; /* Array of SubTables */
+ USHORT 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);
+ ASSERT_STATIC (((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.advance (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 void add_coverage (set_t *glyphs) const {
+ unsigned int count = glyphArray.len;
+ for (unsigned int i = 0; i < count; i++)
+ glyphs->add (glyphArray[i]);
+ }
+
+ 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:
+ USHORT 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.advance (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 void add_coverage (set_t *glyphs) const {
+ unsigned int count = rangeRecord.len;
+ for (unsigned int i = 0; i < count; i++)
+ rangeRecord[i].add_coverage (glyphs);
+ }
+
+ 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;
+ }
+ inline bool more (void) { return i < c->rangeRecord.len; }
+ inline void next (void)
+ {
+ if (j >= c->rangeRecord[i].end)
+ {
+ i++;
+ if (more ())
+ {
+ j = c->rangeRecord[i].start;
+ 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, j, coverage;
+ };
+ private:
+
+ protected:
+ USHORT 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;
+ }
+ }
+
+ template <typename set_t>
+ inline void add_coverage (set_t *glyphs) const {
+ switch (u.format) {
+ case 1: u.format1.add_coverage (glyphs); break;
+ case 2: u.format2.add_coverage (glyphs); break;
+ default: break;
+ }
+ }
+
+ struct Iter {
+ Iter (void) : format (0) {};
+ 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 {
+ CoverageFormat1::Iter format1;
+ CoverageFormat2::Iter format2;
+ } u;
+ };
+
+ protected:
+ union {
+ USHORT 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 void 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);
+ }
+
+ 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 = -1;
+ 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:
+ USHORT classFormat; /* Format identifier--format = 1 */
+ GlyphID startGlyph; /* First GlyphID of the classValueArray */
+ ArrayOf<USHORT>
+ 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 void 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)
+ rangeRecord[i].add_coverage (glyphs);
+ }
+
+ 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_codepoint_t) -1;
+ 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_codepoint_t) -1 && 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:
+ USHORT 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);
+ }
+ }
+
+ inline void add_class (hb_set_t *glyphs, unsigned int klass) const {
+ switch (u.format) {
+ case 1: u.format1.add_class (glyphs, klass); return;
+ case 2: u.format2.add_class (glyphs, klass); return;
+ default:return;
+ }
+ }
+
+ 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 {
+ USHORT 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 + (region_index * axisCount);
+
+ float v = 1.;
+ unsigned int count = MIN (coord_len, (unsigned int) axisCount);
+ for (unsigned int i = 0; i < count; i++)
+ {
+ float factor = axes[i].evaluate (coords[i]);
+ if (factor == 0.)
+ return 0.;
+ v *= factor;
+ }
+ return v;
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ c->check_array (axesZ, axesZ[0].static_size,
+ (unsigned int) axisCount * (unsigned int) regionCount));
+ }
+
+ protected:
+ USHORT axisCount;
+ USHORT regionCount;
+ VarRegionAxis axesZ[VAR];
+ 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 BYTE *bytes = &StructAfter<BYTE> (regionIndices);
+ const BYTE *row = bytes + inner * (scount + count);
+
+ float delta = 0.;
+ unsigned int i = 0;
+
+ const SHORT *scursor = reinterpret_cast<const SHORT *> (row);
+ for (; i < scount; i++)
+ {
+ float scalar = regions.evaluate (regionIndices.array[i], coords, coord_count);
+ delta += scalar * *scursor++;
+ }
+ const INT8 *bcursor = reinterpret_cast<const INT8 *> (scursor);
+ for (; i < count; i++)
+ {
+ float scalar = regions.evaluate (regionIndices.array[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<BYTE> (regionIndices),
+ get_row_size (), itemCount));
+ }
+
+ protected:
+ USHORT itemCount;
+ USHORT shortCount;
+ ArrayOf<USHORT> regionIndices;
+ BYTE 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 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:
+ USHORT format;
+ OffsetTo<VarRegionList, ULONG> regions;
+ OffsetArrayOf<VarData, ULONG> 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:
+ USHORT format; /* Format identifier--format = 1 */
+ USHORT 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 {
+ USHORT 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.array[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, ULONG> 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:
+ USHORT featureIndex;
+ OffsetTo<Feature, ULONG> 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.array[i];
+ if (record.featureIndex == feature_index)
+ return &(this+record.feature);
+ }
+ return NULL;
+ }
+
+ 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:
+ OffsetTo<ConditionSet, ULONG>
+ conditions;
+ OffsetTo<FeatureTableSubstitution, ULONG>
+ 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.array[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 */
+ ArrayOf<FeatureVariationRecord, ULONG>
+ 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 * USHORT::static_size;
+ return USHORT::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:
+ USHORT startSize; /* Smallest size to correct--in ppem */
+ USHORT endSize; /* Largest size to correct--in ppem */
+ USHORT 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
+ */
+ USHORT 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:
+ USHORT outerIndex;
+ USHORT innerIndex;
+ USHORT deltaFormat; /* Format identifier for this table: 0x0x8000 */
+ public:
+ DEFINE_SIZE_STATIC (6);
+};
+
+struct DeviceHeader
+{
+ protected:
+ USHORT reserved1;
+ USHORT reserved2;
+ public:
+ USHORT 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 23:15:20 +0000