1989 lines
55 KiB
C++
1989 lines
55 KiB
C++
/*
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* Copyright © 2007,2008,2009 Red Hat, Inc.
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* Copyright © 2010,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_LAYOUT_COMMON_HH
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#define HB_OT_LAYOUT_COMMON_HH
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#include "hb.hh"
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#include "hb-ot-layout.hh"
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#include "hb-open-type.hh"
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#include "hb-set.hh"
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#ifndef HB_MAX_NESTING_LEVEL
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#define HB_MAX_NESTING_LEVEL 6
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#endif
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#ifndef HB_MAX_CONTEXT_LENGTH
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#define HB_MAX_CONTEXT_LENGTH 64
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#endif
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#ifndef HB_CLOSURE_MAX_STAGES
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/*
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* The maximum number of times a lookup can be applied during shaping.
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* Used to limit the number of iterations of the closure algorithm.
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* This must be larger than the number of times add_pause() is
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* called in a collect_features call of any shaper.
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*/
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#define HB_CLOSURE_MAX_STAGES 32
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#endif
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namespace OT {
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#define NOT_COVERED ((unsigned int) -1)
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/*
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*
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* OpenType Layout Common Table Formats
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*
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*/
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/*
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* Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
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*/
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struct Record_sanitize_closure_t {
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hb_tag_t tag;
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const void *list_base;
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};
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template <typename Type>
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struct Record
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{
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inline int cmp (hb_tag_t a) const {
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return tag.cmp (a);
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}
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inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
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{
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TRACE_SANITIZE (this);
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const Record_sanitize_closure_t closure = {tag, base};
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return_trace (c->check_struct (this) && offset.sanitize (c, base, &closure));
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}
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Tag tag; /* 4-byte Tag identifier */
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OffsetTo<Type>
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offset; /* Offset from beginning of object holding
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* the Record */
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public:
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DEFINE_SIZE_STATIC (6);
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};
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template <typename Type>
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struct RecordArrayOf : SortedArrayOf<Record<Type> >
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{
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inline const OffsetTo<Type>& get_offset (unsigned int i) const
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{ return (*this)[i].offset; }
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inline OffsetTo<Type>& get_offset (unsigned int i)
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{ return (*this)[i].offset; }
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inline const Tag& get_tag (unsigned int i) const
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{ return (*this)[i].tag; }
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inline unsigned int get_tags (unsigned int start_offset,
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unsigned int *record_count /* IN/OUT */,
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hb_tag_t *record_tags /* OUT */) const
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{
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if (record_count) {
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const Record<Type> *arr = this->sub_array (start_offset, record_count);
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unsigned int count = *record_count;
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for (unsigned int i = 0; i < count; i++)
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record_tags[i] = arr[i].tag;
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}
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return this->len;
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}
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inline bool find_index (hb_tag_t tag, unsigned int *index) const
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{
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/* If we want to allow non-sorted data, we can lsearch(). */
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int i = this->/*lsearch*/bsearch (tag);
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if (i != -1) {
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if (index) *index = i;
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return true;
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} else {
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if (index) *index = Index::NOT_FOUND_INDEX;
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return false;
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}
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}
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};
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template <typename Type>
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struct RecordListOf : RecordArrayOf<Type>
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{
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inline const Type& operator [] (unsigned int i) const
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{ return this+this->get_offset (i); }
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inline bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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struct RecordListOf<Type> *out = c->serializer->embed (*this);
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if (unlikely (!out)) return_trace (false);
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unsigned int count = this->len;
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for (unsigned int i = 0; i < count; i++)
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out->get_offset (i).serialize_subset (c, (*this)[i], out);
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return_trace (true);
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (RecordArrayOf<Type>::sanitize (c, this));
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}
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};
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struct RangeRecord
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{
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inline int cmp (hb_codepoint_t g) const {
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return g < start ? -1 : g <= end ? 0 : +1 ;
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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inline bool intersects (const hb_set_t *glyphs) const
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{ return glyphs->intersects (start, end); }
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template <typename set_t>
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inline bool add_coverage (set_t *glyphs) const {
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return glyphs->add_range (start, end);
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}
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GlyphID start; /* First GlyphID in the range */
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GlyphID end; /* Last GlyphID in the range */
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HBUINT16 value; /* Value */
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public:
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DEFINE_SIZE_STATIC (6);
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};
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DECLARE_NULL_NAMESPACE_BYTES (OT, RangeRecord);
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struct IndexArray : ArrayOf<Index>
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{
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inline unsigned int get_indexes (unsigned int start_offset,
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unsigned int *_count /* IN/OUT */,
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unsigned int *_indexes /* OUT */) const
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{
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if (_count) {
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const HBUINT16 *arr = this->sub_array (start_offset, _count);
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unsigned int count = *_count;
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for (unsigned int i = 0; i < count; i++)
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_indexes[i] = arr[i];
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}
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return this->len;
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}
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inline void add_indexes_to (hb_set_t* output /* OUT */) const
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{
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output->add_array (arrayZ, len);
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}
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};
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struct Script;
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struct LangSys;
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struct Feature;
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struct LangSys
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{
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inline unsigned int get_feature_count (void) const
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{ return featureIndex.len; }
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inline hb_tag_t get_feature_index (unsigned int i) const
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{ return featureIndex[i]; }
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inline unsigned int get_feature_indexes (unsigned int start_offset,
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unsigned int *feature_count /* IN/OUT */,
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unsigned int *feature_indexes /* OUT */) const
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{ return featureIndex.get_indexes (start_offset, feature_count, feature_indexes); }
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inline void add_feature_indexes_to (hb_set_t *feature_indexes) const
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{ featureIndex.add_indexes_to (feature_indexes); }
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inline bool has_required_feature (void) const { return reqFeatureIndex != 0xFFFFu; }
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inline unsigned int get_required_feature_index (void) const
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{
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if (reqFeatureIndex == 0xFFFFu)
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return Index::NOT_FOUND_INDEX;
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return reqFeatureIndex;;
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}
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inline bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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return_trace (c->serializer->embed (*this));
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}
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inline bool sanitize (hb_sanitize_context_t *c,
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const Record_sanitize_closure_t * = nullptr) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this) && featureIndex.sanitize (c));
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}
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Offset16 lookupOrderZ; /* = Null (reserved for an offset to a
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* reordering table) */
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HBUINT16 reqFeatureIndex;/* Index of a feature required for this
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* language system--if no required features
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* = 0xFFFFu */
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IndexArray featureIndex; /* Array of indices into the FeatureList */
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public:
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DEFINE_SIZE_ARRAY_SIZED (6, featureIndex);
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};
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DECLARE_NULL_NAMESPACE_BYTES (OT, LangSys);
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struct Script
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{
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inline unsigned int get_lang_sys_count (void) const
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{ return langSys.len; }
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inline const Tag& get_lang_sys_tag (unsigned int i) const
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{ return langSys.get_tag (i); }
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inline unsigned int get_lang_sys_tags (unsigned int start_offset,
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unsigned int *lang_sys_count /* IN/OUT */,
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hb_tag_t *lang_sys_tags /* OUT */) const
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{ return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
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inline const LangSys& get_lang_sys (unsigned int i) const
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{
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if (i == Index::NOT_FOUND_INDEX) return get_default_lang_sys ();
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return this+langSys[i].offset;
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}
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inline bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
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{ return langSys.find_index (tag, index); }
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inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
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inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
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inline bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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struct Script *out = c->serializer->embed (*this);
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if (unlikely (!out)) return_trace (false);
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out->defaultLangSys.serialize_subset (c, this+defaultLangSys, out);
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unsigned int count = langSys.len;
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for (unsigned int i = 0; i < count; i++)
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out->langSys.arrayZ[i].offset.serialize_subset (c, this+langSys[i].offset, out);
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return_trace (true);
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}
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inline bool sanitize (hb_sanitize_context_t *c,
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const Record_sanitize_closure_t * = nullptr) const
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{
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TRACE_SANITIZE (this);
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return_trace (defaultLangSys.sanitize (c, this) && langSys.sanitize (c, this));
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}
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protected:
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OffsetTo<LangSys>
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defaultLangSys; /* Offset to DefaultLangSys table--from
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* beginning of Script table--may be Null */
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RecordArrayOf<LangSys>
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langSys; /* Array of LangSysRecords--listed
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* alphabetically by LangSysTag */
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public:
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DEFINE_SIZE_ARRAY_SIZED (4, langSys);
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};
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typedef RecordListOf<Script> ScriptList;
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/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#size */
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struct FeatureParamsSize
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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if (unlikely (!c->check_struct (this))) return_trace (false);
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/* This subtable has some "history", if you will. Some earlier versions of
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* Adobe tools calculated the offset of the FeatureParams sutable from the
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* beginning of the FeatureList table! Now, that is dealt with in the
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* Feature implementation. But we still need to be able to tell junk from
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* real data. Note: We don't check that the nameID actually exists.
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*
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* Read Roberts wrote on 9/15/06 on opentype-list@indx.co.uk :
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*
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* Yes, it is correct that a new version of the AFDKO (version 2.0) will be
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* coming out soon, and that the makeotf program will build a font with a
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* 'size' feature that is correct by the specification.
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*
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* The specification for this feature tag is in the "OpenType Layout Tag
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* Registry". You can see a copy of this at:
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* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#tag-size
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*
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* Here is one set of rules to determine if the 'size' feature is built
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* correctly, or as by the older versions of MakeOTF. You may be able to do
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* better.
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*
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* Assume that the offset to the size feature is according to specification,
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* and make the following value checks. If it fails, assume the size
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* feature is calculated as versions of MakeOTF before the AFDKO 2.0 built it.
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* If this fails, reject the 'size' feature. The older makeOTF's calculated the
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* offset from the beginning of the FeatureList table, rather than from the
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* beginning of the 'size' Feature table.
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*
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* If "design size" == 0:
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* fails check
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*
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* Else if ("subfamily identifier" == 0 and
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* "range start" == 0 and
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* "range end" == 0 and
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* "range start" == 0 and
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* "menu name ID" == 0)
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* passes check: this is the format used when there is a design size
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* specified, but there is no recommended size range.
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*
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* Else if ("design size" < "range start" or
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* "design size" > "range end" or
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* "range end" <= "range start" or
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* "menu name ID" < 256 or
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* "menu name ID" > 32767 or
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* menu name ID is not a name ID which is actually in the name table)
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* fails test
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* Else
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* passes test.
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*/
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if (!designSize)
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return_trace (false);
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else if (subfamilyID == 0 &&
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subfamilyNameID == 0 &&
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rangeStart == 0 &&
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rangeEnd == 0)
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return_trace (true);
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else if (designSize < rangeStart ||
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designSize > rangeEnd ||
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subfamilyNameID < 256 ||
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subfamilyNameID > 32767)
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return_trace (false);
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else
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return_trace (true);
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}
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HBUINT16 designSize; /* Represents the design size in 720/inch
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* units (decipoints). The design size entry
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* must be non-zero. When there is a design
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* size but no recommended size range, the
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* rest of the array will consist of zeros. */
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HBUINT16 subfamilyID; /* Has no independent meaning, but serves
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* as an identifier that associates fonts
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* in a subfamily. All fonts which share a
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* Preferred or Font Family name and which
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* differ only by size range shall have the
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* same subfamily value, and no fonts which
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* differ in weight or style shall have the
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* same subfamily value. If this value is
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* zero, the remaining fields in the array
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* will be ignored. */
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NameID subfamilyNameID;/* If the preceding value is non-zero, this
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* value must be set in the range 256 - 32767
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* (inclusive). It records the value of a
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* field in the name table, which must
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* contain English-language strings encoded
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* in Windows Unicode and Macintosh Roman,
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* and may contain additional strings
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* localized to other scripts and languages.
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* Each of these strings is the name an
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* application should use, in combination
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* with the family name, to represent the
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* subfamily in a menu. Applications will
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* choose the appropriate version based on
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* their selection criteria. */
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HBUINT16 rangeStart; /* Large end of the recommended usage range
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* (inclusive), stored in 720/inch units
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* (decipoints). */
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HBUINT16 rangeEnd; /* Small end of the recommended usage range
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(exclusive), stored in 720/inch units
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* (decipoints). */
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public:
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DEFINE_SIZE_STATIC (10);
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};
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/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#ssxx */
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struct FeatureParamsStylisticSet
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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/* Right now minorVersion is at zero. Which means, any table supports
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* the uiNameID field. */
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return_trace (c->check_struct (this));
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}
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HBUINT16 version; /* (set to 0): This corresponds to a “minor”
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* version number. Additional data may be
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* added to the end of this Feature Parameters
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* table in the future. */
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NameID uiNameID; /* The 'name' table name ID that specifies a
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* string (or strings, for multiple languages)
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* for a user-interface label for this
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* feature. The values of uiLabelNameId and
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* sampleTextNameId are expected to be in the
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* font-specific name ID range (256-32767),
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* though that is not a requirement in this
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* Feature Parameters specification. The
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* user-interface label for the feature can
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* be provided in multiple languages. An
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* English string should be included as a
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* fallback. The string should be kept to a
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* minimal length to fit comfortably with
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* different application interfaces. */
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public:
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DEFINE_SIZE_STATIC (4);
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};
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/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#cv01-cv99 */
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struct FeatureParamsCharacterVariants
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this) &&
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characters.sanitize (c));
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}
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HBUINT16 format; /* Format number is set to 0. */
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NameID featUILableNameID; /* The ‘name’ table name ID that
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* specifies a string (or strings,
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* for multiple languages) for a
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* user-interface label for this
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* feature. (May be NULL.) */
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NameID featUITooltipTextNameID;/* The ‘name’ table name ID that
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* specifies a string (or strings,
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* for multiple languages) that an
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* application can use for tooltip
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* text for this feature. (May be
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* nullptr.) */
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NameID sampleTextNameID; /* The ‘name’ table name ID that
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* specifies sample text that
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* illustrates the effect of this
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* feature. (May be NULL.) */
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HBUINT16 numNamedParameters; /* Number of named parameters. (May
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* be zero.) */
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NameID firstParamUILabelNameID;/* The first ‘name’ table name ID
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* used to specify strings for
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* user-interface labels for the
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* feature parameters. (Must be zero
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* if numParameters is zero.) */
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ArrayOf<HBUINT24>
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characters; /* Array of the Unicode Scalar Value
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* of the characters for which this
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* feature provides glyph variants.
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* (May be zero.) */
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public:
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DEFINE_SIZE_ARRAY (14, characters);
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};
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struct FeatureParams
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{
|
||
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);
|
||
}
|
||
|
||
inline const FeatureParamsStylisticSet& get_stylistic_set_params (hb_tag_t tag) const
|
||
{
|
||
if ((tag & 0xFFFF0000u) == HB_TAG ('s','s','\0','\0')) /* ssXX */
|
||
return u.stylisticSet;
|
||
return Null(FeatureParamsStylisticSet);
|
||
}
|
||
|
||
inline const FeatureParamsCharacterVariants& get_character_variants_params (hb_tag_t tag) const
|
||
{
|
||
if ((tag & 0xFFFF0000u) == HB_TAG ('c','v','\0','\0')) /* cvXX */
|
||
return u.characterVariants;
|
||
return Null(FeatureParamsCharacterVariants);
|
||
}
|
||
|
||
private:
|
||
union {
|
||
FeatureParamsSize size;
|
||
FeatureParamsStylisticSet stylisticSet;
|
||
FeatureParamsCharacterVariants characterVariants;
|
||
} u;
|
||
public:
|
||
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 subset (hb_subset_context_t *c) const
|
||
{
|
||
TRACE_SUBSET (this);
|
||
struct Feature *out = c->serializer->embed (*this);
|
||
if (unlikely (!out)) return_trace (false);
|
||
out->featureParams.set (0); /* TODO(subset) FeatureParams. */
|
||
return_trace (true);
|
||
}
|
||
|
||
inline bool sanitize (hb_sanitize_context_t *c,
|
||
const Record_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_SIZED (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 TSubTable>
|
||
inline const TSubTable& get_subtable (unsigned int i) const
|
||
{ return this+CastR<OffsetArrayOf<TSubTable> > (subTable)[i]; }
|
||
|
||
template <typename TSubTable>
|
||
inline const OffsetArrayOf<TSubTable>& get_subtables (void) const
|
||
{ return CastR<OffsetArrayOf<TSubTable> > (subTable); }
|
||
template <typename TSubTable>
|
||
inline OffsetArrayOf<TSubTable>& get_subtables (void)
|
||
{ return CastR<OffsetArrayOf<TSubTable> > (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 TSubTable, 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<TSubTable> (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);
|
||
}
|
||
|
||
/* Older compilers need this to NOT be locally defined in a function. */
|
||
template <typename TSubTable>
|
||
struct SubTableSubsetWrapper
|
||
{
|
||
inline SubTableSubsetWrapper (const TSubTable &subtable_,
|
||
unsigned int lookup_type_) :
|
||
subtable (subtable_),
|
||
lookup_type (lookup_type_) {}
|
||
|
||
inline bool subset (hb_subset_context_t *c) const
|
||
{ return subtable.dispatch (c, lookup_type); }
|
||
|
||
private:
|
||
const TSubTable &subtable;
|
||
unsigned int lookup_type;
|
||
};
|
||
|
||
template <typename TSubTable>
|
||
inline bool subset (hb_subset_context_t *c) const
|
||
{
|
||
TRACE_SUBSET (this);
|
||
struct Lookup *out = c->serializer->embed (*this);
|
||
if (unlikely (!out)) return_trace (false);
|
||
|
||
/* Subset the actual subtables. */
|
||
/* TODO Drop empty ones, either by calling intersects() beforehand,
|
||
* or just dropping null offsets after. */
|
||
const OffsetArrayOf<TSubTable>& subtables = get_subtables<TSubTable> ();
|
||
OffsetArrayOf<TSubTable>& out_subtables = out->get_subtables<TSubTable> ();
|
||
unsigned int count = subTable.len;
|
||
for (unsigned int i = 0; i < count; i++)
|
||
{
|
||
SubTableSubsetWrapper<TSubTable> wrapper (this+subtables[i], get_type ());
|
||
|
||
out_subtables[i].serialize_subset (c, wrapper, out);
|
||
}
|
||
|
||
return_trace (true);
|
||
}
|
||
|
||
template <typename TSubTable>
|
||
inline bool sanitize (hb_sanitize_context_t *c) const
|
||
{
|
||
TRACE_SANITIZE (this);
|
||
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);
|
||
}
|
||
|
||
if (unlikely (!dispatch<TSubTable> (c))) return_trace (false);
|
||
|
||
if (unlikely (get_type () == TSubTable::Extension))
|
||
{
|
||
/* The spec says all subtables of an Extension lookup should
|
||
* have the same type, which shall not be the Extension type
|
||
* itself (but we already checked for that).
|
||
* This is specially important if one has a reverse type! */
|
||
unsigned int type = get_subtable<TSubTable> (0).u.extension.get_type ();
|
||
unsigned int count = get_subtable_count ();
|
||
for (unsigned int i = 1; i < count; i++)
|
||
if (get_subtable<TSubTable> (i).u.extension.get_type () != type)
|
||
return_trace (false);
|
||
}
|
||
return_trace (true);
|
||
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 (const hb_set_t *glyphs) const
|
||
{
|
||
/* TODO Speed up, using hb_set_next() and bsearch()? */
|
||
unsigned int count = glyphArray.len;
|
||
for (unsigned int i = 0; i < count; i++)
|
||
if (glyphs->has (glyphArray[i]))
|
||
return true;
|
||
return false;
|
||
}
|
||
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 void fini (void) {};
|
||
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 (const hb_set_t *glyphs) const
|
||
{
|
||
/* TODO Speed up, using hb_set_next() and bsearch()? */
|
||
unsigned int count = rangeRecord.len;
|
||
for (unsigned int i = 0; i < count; i++)
|
||
if (rangeRecord[i].intersects (glyphs))
|
||
return true;
|
||
return false;
|
||
}
|
||
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 void fini (void) {};
|
||
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
|
||
{
|
||
switch (u.format)
|
||
{
|
||
case 1: return u.format1.intersects (glyphs);
|
||
case 2: return u.format2.intersects (glyphs);
|
||
default: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 void fini (void) {}
|
||
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 (const hb_set_t *glyphs) const
|
||
{
|
||
/* TODO Speed up, using hb_set_next()? */
|
||
hb_codepoint_t start = startGlyph;
|
||
hb_codepoint_t end = startGlyph + classValue.len;
|
||
for (hb_codepoint_t iter = startGlyph - 1;
|
||
hb_set_next (glyphs, &iter) && iter < end;)
|
||
if (classValue[iter - start])
|
||
return true;
|
||
return false;
|
||
}
|
||
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 (const hb_set_t *glyphs) const
|
||
{
|
||
/* TODO Speed up, using hb_set_next() and bsearch()? */
|
||
unsigned int count = rangeRecord.len;
|
||
for (unsigned int i = 0; i < count; i++)
|
||
if (rangeRecord[i].intersects (glyphs))
|
||
return true;
|
||
return false;
|
||
}
|
||
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 (const hb_set_t *glyphs) const {
|
||
switch (u.format) {
|
||
case 1: return u.format1.intersects (glyphs);
|
||
case 2: return u.format2.intersects (glyphs);
|
||
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 ®ions) 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),
|
||
itemCount, get_row_size ()));
|
||
}
|
||
|
||
protected:
|
||
HBUINT16 itemCount;
|
||
HBUINT16 shortCount;
|
||
ArrayOf<HBUINT16> regionIndices;
|
||
UnsizedArrayOf<HBUINT8>bytesX;
|
||
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
|
||
{
|
||
enum { 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 subset (hb_subset_context_t *c) const
|
||
{
|
||
TRACE_SUBSET (this);
|
||
return_trace (c->serializer->embed (*this));
|
||
}
|
||
|
||
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_SIZED (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 = deltaValueZ[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
|
||
*/
|
||
UnsizedArrayOf<HBUINT16>
|
||
deltaValueZ; /* Array of compressed data */
|
||
public:
|
||
DEFINE_SIZE_ARRAY (6, deltaValueZ);
|
||
};
|
||
|
||
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_HH */
|