560 lines
16 KiB
C++
560 lines
16 KiB
C++
/*
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* Copyright © 2018 Adobe Systems Incorporated.
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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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* Adobe Author(s): Michiharu Ariza
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*/
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#ifndef HB_OT_CFF2_TABLE_HH
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#define HB_OT_CFF2_TABLE_HH
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#include "hb-ot-cff-common.hh"
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#include "hb-subset-cff2.hh"
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namespace CFF {
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/*
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* CFF2 -- Compact Font Format (CFF) Version 2
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* https://docs.microsoft.com/en-us/typography/opentype/spec/cff2
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*/
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#define HB_OT_TAG_cff2 HB_TAG('C','F','F','2')
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typedef CFFIndex<HBUINT32> CFF2Index;
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template <typename Type> struct CFF2IndexOf : CFFIndexOf<HBUINT32, Type> {};
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typedef CFF2Index CFF2CharStrings;
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typedef FDArray<HBUINT32> CFF2FDArray;
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typedef Subrs<HBUINT32> CFF2Subrs;
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typedef FDSelect3_4<HBUINT32, HBUINT16> FDSelect4;
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typedef FDSelect3_4_Range<HBUINT32, HBUINT16> FDSelect4_Range;
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struct CFF2FDSelect
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{
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inline bool sanitize (hb_sanitize_context_t *c, unsigned int fdcount) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) && (format == 0 || format == 3 || format == 4) &&
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(format == 0)?
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u.format0.sanitize (c, fdcount):
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((format == 3)?
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u.format3.sanitize (c, fdcount):
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u.format4.sanitize (c, fdcount))));
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}
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inline bool serialize (hb_serialize_context_t *c, const CFF2FDSelect &src, unsigned int num_glyphs)
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{
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TRACE_SERIALIZE (this);
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unsigned int size = src.get_size (num_glyphs);
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CFF2FDSelect *dest = c->allocate_size<CFF2FDSelect> (size);
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if (unlikely (dest == nullptr)) return_trace (false);
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memcpy (dest, &src, size);
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return_trace (true);
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}
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inline unsigned int calculate_serialized_size (unsigned int num_glyphs) const
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{ return get_size (num_glyphs); }
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inline unsigned int get_size (unsigned int num_glyphs) const
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{
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unsigned int size = format.static_size;
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if (format == 0)
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size += u.format0.get_size (num_glyphs);
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else if (format == 3)
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size += u.format3.get_size ();
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else
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size += u.format4.get_size ();
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return size;
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}
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inline hb_codepoint_t get_fd (hb_codepoint_t glyph) const
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{
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if (this == &Null(CFF2FDSelect))
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return 0;
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if (format == 0)
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return u.format0.get_fd (glyph);
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else if (format == 3)
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return u.format3.get_fd (glyph);
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else
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return u.format4.get_fd (glyph);
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}
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HBUINT8 format;
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union {
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FDSelect0 format0;
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FDSelect3 format3;
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FDSelect4 format4;
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} u;
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DEFINE_SIZE_MIN (2);
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};
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struct CFF2VariationStore
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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 (likely (c->check_struct (this)) && varStore.sanitize (c));
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}
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inline bool serialize (hb_serialize_context_t *c, const CFF2VariationStore *varStore)
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{
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TRACE_SERIALIZE (this);
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unsigned int size_ = varStore->get_size ();
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CFF2VariationStore *dest = c->allocate_size<CFF2VariationStore> (size_);
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if (unlikely (dest == nullptr)) return_trace (false);
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memcpy (dest, varStore, size_);
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return_trace (true);
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}
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inline unsigned int get_size (void) const { return HBUINT16::static_size + size; }
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HBUINT16 size;
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VariationStore varStore;
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DEFINE_SIZE_MIN (2 + VariationStore::min_size);
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};
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struct CFF2TopDictValues : TopDictValues
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{
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inline void init (void)
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{
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TopDictValues::init ();
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vstoreOffset = 0;
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FDSelectOffset = 0;
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}
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inline void fini (void)
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{
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TopDictValues::fini ();
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}
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inline unsigned int calculate_serialized_size (void) const
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{
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unsigned int size = 0;
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for (unsigned int i = 0; i < getNumValues (); i++)
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{
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OpCode op = getValue (i).op;
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switch (op)
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{
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case OpCode_vstore:
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case OpCode_FDSelect:
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size += OpCode_Size (OpCode_longintdict) + 4 + OpCode_Size (op);
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break;
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default:
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size += TopDictValues::calculate_serialized_op_size (getValue (i));
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break;
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}
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}
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return size;
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}
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unsigned int vstoreOffset;
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unsigned int FDSelectOffset;
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};
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struct CFF2TopDictOpSet : TopDictOpSet
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{
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static inline bool process_op (OpCode op, NumInterpEnv& env, CFF2TopDictValues& dictval)
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{
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switch (op) {
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case OpCode_FontMatrix:
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{
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DictVal val;
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val.init ();
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dictval.addOp (op, env.substr);
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env.clear_args ();
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}
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break;
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case OpCode_vstore:
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if (unlikely (!env.argStack.check_pop_uint (dictval.vstoreOffset)))
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return false;
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env.clear_args ();
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break;
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case OpCode_FDSelect:
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if (unlikely (!env.argStack.check_pop_uint (dictval.FDSelectOffset)))
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return false;
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env.clear_args ();
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break;
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default:
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if (unlikely (!SUPER::process_op (op, env, dictval)))
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return false;
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/* Record this operand below if stack is empty, otherwise done */
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if (!env.argStack.is_empty ()) return true;
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}
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dictval.addOp (op, env.substr);
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return true;
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}
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typedef TopDictOpSet SUPER;
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};
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struct CFF2FontDictValues : DictValues<OpStr>
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{
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inline void init (void)
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{
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DictValues<OpStr>::init ();
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privateDictInfo.init ();
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}
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inline void fini (void)
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{
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DictValues<OpStr>::fini ();
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}
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TableInfo privateDictInfo;
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};
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struct CFF2FontDictOpSet : DictOpSet
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{
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static inline bool process_op (OpCode op, NumInterpEnv& env, CFF2FontDictValues& dictval)
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{
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switch (op) {
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case OpCode_Private:
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if (unlikely (!env.argStack.check_pop_uint (dictval.privateDictInfo.offset)))
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return false;
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if (unlikely (!env.argStack.check_pop_uint (dictval.privateDictInfo.size)))
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return false;
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env.clear_args ();
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break;
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default:
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if (unlikely (!SUPER::process_op (op, env)))
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return false;
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if (!env.argStack.is_empty ())
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return true;
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}
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dictval.addOp (op, env.substr);
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return true;
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}
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private:
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typedef DictOpSet SUPER;
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};
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template <typename VAL>
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struct CFF2PrivateDictValues_Base : DictValues<VAL>
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{
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inline void init (void)
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{
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DictValues<VAL>::init ();
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subrsOffset = 0;
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localSubrs = &Null(CFF2Subrs);
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vsindex = 0;
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}
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inline void fini (void)
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{
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DictValues<VAL>::fini ();
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}
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inline unsigned int calculate_serialized_size (void) const
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{
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unsigned int size = 0;
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for (unsigned int i = 0; i < DictValues<VAL>::getNumValues; i++)
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if (DictValues<VAL>::getValue (i).op == OpCode_Subrs)
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size += OpCode_Size (OpCode_shortint) + 2 + OpCode_Size (OpCode_Subrs);
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else
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size += DictValues<VAL>::getValue (i).str.len;
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return size;
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}
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unsigned int subrsOffset;
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const CFF2Subrs *localSubrs;
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unsigned int vsindex;
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};
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typedef CFF2PrivateDictValues_Base<OpStr> CFF2PrivateDictValues_Subset;
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typedef CFF2PrivateDictValues_Base<NumDictVal> CFF2PrivateDictValues;
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struct CFF2PrivateDictOpSet : DictOpSet
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{
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static inline bool process_op (OpCode op, NumInterpEnv& env, CFF2PrivateDictValues& dictval)
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{
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NumDictVal val;
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val.init ();
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switch (op) {
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case OpCode_StdHW:
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case OpCode_StdVW:
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case OpCode_BlueScale:
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case OpCode_BlueShift:
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case OpCode_BlueFuzz:
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case OpCode_ExpansionFactor:
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case OpCode_LanguageGroup:
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if (unlikely (!env.argStack.check_pop_num (val.single_val)))
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return false;
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env.clear_args ();
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break;
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case OpCode_BlueValues:
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case OpCode_OtherBlues:
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case OpCode_FamilyBlues:
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case OpCode_FamilyOtherBlues:
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case OpCode_StemSnapH:
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case OpCode_StemSnapV:
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if (unlikely (!env.argStack.check_pop_delta (val.multi_val)))
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return false;
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env.clear_args ();
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break;
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case OpCode_Subrs:
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if (unlikely (!env.argStack.check_pop_uint (dictval.subrsOffset)))
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return false;
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env.clear_args ();
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break;
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case OpCode_vsindexdict:
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if (unlikely (!env.argStack.check_pop_uint (dictval.vsindex)))
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return false;
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break;
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case OpCode_blenddict:
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break;
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default:
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if (unlikely (!DictOpSet::process_op (op, env)))
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return false;
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if (!env.argStack.is_empty ()) return true;
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break;
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}
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dictval.addOp (op, env.substr, val);
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return true;
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}
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};
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struct CFF2PrivateDictOpSet_Subset : DictOpSet
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{
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static inline bool process_op (OpCode op, NumInterpEnv& env, CFF2PrivateDictValues_Subset& dictval)
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{
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switch (op) {
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case OpCode_BlueValues:
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case OpCode_OtherBlues:
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case OpCode_FamilyBlues:
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case OpCode_FamilyOtherBlues:
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case OpCode_StdHW:
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case OpCode_StdVW:
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case OpCode_BlueScale:
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case OpCode_BlueShift:
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case OpCode_BlueFuzz:
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case OpCode_StemSnapH:
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case OpCode_StemSnapV:
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case OpCode_LanguageGroup:
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case OpCode_ExpansionFactor:
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env.clear_args ();
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break;
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case OpCode_blenddict:
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env.clear_args ();
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return true;
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case OpCode_Subrs:
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if (unlikely (!env.argStack.check_pop_uint (dictval.subrsOffset)))
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return false;
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env.clear_args ();
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break;
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default:
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if (unlikely (!SUPER::process_op (op, env)))
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return false;
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if (!env.argStack.is_empty ()) return true;
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break;
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}
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dictval.addOp (op, env.substr);
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return true;
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}
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private:
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typedef DictOpSet SUPER;
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};
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typedef DictInterpreter<CFF2TopDictOpSet, CFF2TopDictValues> CFF2TopDict_Interpreter;
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typedef DictInterpreter<CFF2FontDictOpSet, CFF2FontDictValues> CFF2FontDict_Interpreter;
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}; /* namespace CFF */
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namespace OT {
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using namespace CFF;
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struct cff2
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{
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static const hb_tag_t tableTag = HB_OT_TAG_cff2;
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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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likely (version.major == 2));
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}
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template <typename PRIVOPSET, typename PRIVDICTVAL>
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struct accelerator_templ_t
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{
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inline void init (hb_face_t *face)
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{
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topDict.init ();
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fontDicts.init ();
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privateDicts.init ();
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this->blob = sc.reference_table<cff2> (face);
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/* setup for run-time santization */
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sc.init (this->blob);
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sc.start_processing ();
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const OT::cff2 *cff2 = this->blob->template as<OT::cff2> ();
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if (cff2 == &Null(OT::cff2))
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{ fini (); return; }
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{ /* parse top dict */
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ByteStr topDictStr (cff2 + cff2->topDict, cff2->topDictSize);
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if (unlikely (!topDictStr.sanitize (&sc))) { fini (); return; }
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CFF2TopDict_Interpreter top_interp;
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top_interp.env.init (topDictStr);
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if (unlikely (!top_interp.interpret (topDict))) { fini (); return; }
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}
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globalSubrs = &StructAtOffset<CFF2Subrs> (cff2, cff2->topDict + cff2->topDictSize);
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varStore = &StructAtOffsetOrNull<CFF2VariationStore> (cff2, topDict.vstoreOffset);
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charStrings = &StructAtOffsetOrNull<CFF2CharStrings> (cff2, topDict.charStringsOffset);
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fdArray = &StructAtOffsetOrNull<CFF2FDArray> (cff2, topDict.FDArrayOffset);
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fdSelect = &StructAtOffsetOrNull<CFF2FDSelect> (cff2, topDict.FDSelectOffset);
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if (((varStore != &Null(CFF2VariationStore)) && unlikely (!varStore->sanitize (&sc))) ||
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(charStrings == &Null(CFF2CharStrings)) || unlikely (!charStrings->sanitize (&sc)) ||
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(fdArray == &Null(CFF2FDArray)) || unlikely (!fdArray->sanitize (&sc)) ||
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(((fdSelect != &Null(CFF2FDSelect)) && unlikely (!fdSelect->sanitize (&sc, fdArray->count)))))
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{ fini (); return; }
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num_glyphs = charStrings->count;
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if (num_glyphs != sc.get_num_glyphs ())
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{ fini (); return; }
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if (varStore != &Null(CFF2VariationStore))
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region_count = varStore->varStore.get_region_count ();
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else
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region_count = 0;
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fdCount = fdArray->count;
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privateDicts.resize (fdCount);
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/* parse font dicts and gather private dicts */
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for (unsigned int i = 0; i < fdCount; i++)
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{
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const ByteStr fontDictStr = (*fdArray)[i];
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if (unlikely (!fontDictStr.sanitize (&sc))) { fini (); return; }
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CFF2FontDictValues *font;
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CFF2FontDict_Interpreter font_interp;
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font_interp.env.init (fontDictStr);
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font = fontDicts.push ();
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if (unlikely (!font_interp.interpret (*font))) { fini (); return; }
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const ByteStr privDictStr (StructAtOffsetOrNull<UnsizedByteStr> (cff2, font->privateDictInfo.offset), font->privateDictInfo.size);
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if (unlikely (!privDictStr.sanitize (&sc))) { fini (); return; }
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DictInterpreter<PRIVOPSET, PRIVDICTVAL> priv_interp;
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priv_interp.env.init(privDictStr);
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if (unlikely (!priv_interp.interpret (privateDicts[i]))) { fini (); return; }
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privateDicts[i].localSubrs = &StructAtOffsetOrNull<CFF2Subrs> (privDictStr.str, privateDicts[i].subrsOffset);
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if (privateDicts[i].localSubrs != &Null(CFF2Subrs) &&
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unlikely (!privateDicts[i].localSubrs->sanitize (&sc)))
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{ fini (); return; }
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}
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}
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inline void fini (void)
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{
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sc.end_processing ();
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fontDicts.fini ();
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privateDicts.fini ();
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hb_blob_destroy (blob);
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blob = nullptr;
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}
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inline bool is_valid (void) const { return blob != nullptr; }
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inline bool get_extents (hb_codepoint_t glyph,
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hb_glyph_extents_t *extents) const
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{
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// XXX: TODO
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if (glyph >= num_glyphs)
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return false;
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return true;
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}
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protected:
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hb_blob_t *blob;
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hb_sanitize_context_t sc;
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public:
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CFF2TopDictValues topDict;
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const CFF2Subrs *globalSubrs;
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const CFF2VariationStore *varStore;
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const CFF2CharStrings *charStrings;
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const CFF2FDArray *fdArray;
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const CFF2FDSelect *fdSelect;
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unsigned int fdCount;
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hb_vector_t<CFF2FontDictValues> fontDicts;
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hb_vector_t<PRIVDICTVAL> privateDicts;
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unsigned int num_glyphs;
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|
unsigned int region_count;
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|
};
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|
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typedef accelerator_templ_t<CFF2PrivateDictOpSet, CFF2PrivateDictValues> accelerator_t;
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typedef accelerator_templ_t<CFF2PrivateDictOpSet_Subset, CFF2PrivateDictValues_Subset> accelerator_subset_t;
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|
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inline bool subset (hb_subset_plan_t *plan) const
|
|
{
|
|
hb_blob_t *cff2_prime = nullptr;
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|
|
|
bool success = true;
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if (hb_subset_cff2 (plan, &cff2_prime)) {
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|
success = success && plan->add_table (HB_OT_TAG_cff2, cff2_prime);
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|
} else {
|
|
success = false;
|
|
}
|
|
hb_blob_destroy (cff2_prime);
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|
|
|
return success;
|
|
}
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|
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|
public:
|
|
FixedVersion<HBUINT8> version; /* Version of CFF2 table. set to 0x0200u */
|
|
OffsetTo<TopDict, HBUINT8> topDict; /* headerSize = Offset to Top DICT. */
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|
HBUINT16 topDictSize; /* Top DICT size */
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|
|
|
public:
|
|
DEFINE_SIZE_STATIC (5);
|
|
};
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|
|
|
} /* namespace OT */
|
|
|
|
#endif /* HB_OT_CFF2_TABLE_HH */
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