536 lines
15 KiB
C++
536 lines
15 KiB
C++
/*
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* Copyright © 2018 Adobe 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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* 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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#include "hb-draw.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 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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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)) 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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unsigned int get_size (unsigned int num_glyphs) const
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{
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switch (format)
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{
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case 0: return format.static_size + u.format0.get_size (num_glyphs);
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case 3: return format.static_size + u.format3.get_size ();
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case 4: return format.static_size + u.format4.get_size ();
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default:return 0;
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}
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}
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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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switch (format)
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{
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case 0: return u.format0.get_fd (glyph);
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case 3: return u.format3.get_fd (glyph);
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case 4: return u.format4.get_fd (glyph);
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default:return 0;
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}
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}
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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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if (unlikely (!c->check_struct (this)))
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return_trace (false);
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switch (format)
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{
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case 0: return_trace (u.format0.sanitize (c, fdcount));
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case 3: return_trace (u.format3.sanitize (c, fdcount));
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case 4: return_trace (u.format4.sanitize (c, fdcount));
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default:return_trace (false);
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}
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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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public:
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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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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)) && c->check_range (&varStore, size) && varStore.sanitize (c));
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}
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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)) 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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unsigned int get_size () 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 cff2_top_dict_values_t : top_dict_values_t<>
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{
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void init ()
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{
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top_dict_values_t<>::init ();
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vstoreOffset = 0;
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FDSelectOffset = 0;
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}
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void fini () { top_dict_values_t<>::fini (); }
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unsigned int vstoreOffset;
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unsigned int FDSelectOffset;
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};
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struct cff2_top_dict_opset_t : top_dict_opset_t<>
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{
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static void process_op (op_code_t op, num_interp_env_t& env, cff2_top_dict_values_t& 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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dict_val_t val;
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val.init ();
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dictval.add_op (op, env.str_ref);
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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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dictval.vstoreOffset = env.argStack.pop_uint ();
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env.clear_args ();
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break;
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case OpCode_FDSelect:
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dictval.FDSelectOffset = env.argStack.pop_uint ();
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env.clear_args ();
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break;
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default:
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SUPER::process_op (op, env, dictval);
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/* Record this operand below if stack is empty, otherwise done */
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if (!env.argStack.is_empty ()) return;
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}
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if (unlikely (env.in_error ())) return;
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dictval.add_op (op, env.str_ref);
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}
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typedef top_dict_opset_t<> SUPER;
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};
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struct cff2_font_dict_values_t : dict_values_t<op_str_t>
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{
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void init ()
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{
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dict_values_t<op_str_t>::init ();
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privateDictInfo.init ();
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}
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void fini () { dict_values_t<op_str_t>::fini (); }
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table_info_t privateDictInfo;
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};
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struct cff2_font_dict_opset_t : dict_opset_t
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{
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static void process_op (op_code_t op, num_interp_env_t& env, cff2_font_dict_values_t& dictval)
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{
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switch (op) {
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case OpCode_Private:
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dictval.privateDictInfo.offset = env.argStack.pop_uint ();
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dictval.privateDictInfo.size = env.argStack.pop_uint ();
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env.clear_args ();
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break;
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default:
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SUPER::process_op (op, env);
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if (!env.argStack.is_empty ())
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return;
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}
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if (unlikely (env.in_error ())) return;
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dictval.add_op (op, env.str_ref);
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}
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private:
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typedef dict_opset_t SUPER;
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};
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template <typename VAL>
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struct cff2_private_dict_values_base_t : dict_values_t<VAL>
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{
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void init ()
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{
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dict_values_t<VAL>::init ();
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subrsOffset = 0;
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localSubrs = &Null (CFF2Subrs);
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ivs = 0;
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}
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void fini () { dict_values_t<VAL>::fini (); }
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unsigned int subrsOffset;
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const CFF2Subrs *localSubrs;
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unsigned int ivs;
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};
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typedef cff2_private_dict_values_base_t<op_str_t> cff2_private_dict_values_subset_t;
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typedef cff2_private_dict_values_base_t<num_dict_val_t> cff2_private_dict_values_t;
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struct cff2_priv_dict_interp_env_t : num_interp_env_t
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{
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cff2_priv_dict_interp_env_t (const hb_ubytes_t &str) :
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num_interp_env_t (str) {}
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void process_vsindex ()
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{
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if (likely (!seen_vsindex))
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{
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set_ivs (argStack.pop_uint ());
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}
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seen_vsindex = true;
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}
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unsigned int get_ivs () const { return ivs; }
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void set_ivs (unsigned int ivs_) { ivs = ivs_; }
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protected:
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unsigned int ivs = 0;
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bool seen_vsindex = false;
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};
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struct cff2_private_dict_opset_t : dict_opset_t
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{
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static void process_op (op_code_t op, cff2_priv_dict_interp_env_t& env, cff2_private_dict_values_t& dictval)
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{
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num_dict_val_t 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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val.single_val = env.argStack.pop_num ();
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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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env.clear_args ();
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break;
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case OpCode_Subrs:
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dictval.subrsOffset = env.argStack.pop_uint ();
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env.clear_args ();
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break;
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case OpCode_vsindexdict:
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env.process_vsindex ();
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dictval.ivs = env.get_ivs ();
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env.clear_args ();
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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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dict_opset_t::process_op (op, env);
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if (!env.argStack.is_empty ()) return;
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break;
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}
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if (unlikely (env.in_error ())) return;
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dictval.add_op (op, env.str_ref, val);
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}
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};
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struct cff2_private_dict_opset_subset_t : dict_opset_t
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{
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static void process_op (op_code_t op, cff2_priv_dict_interp_env_t& env, cff2_private_dict_values_subset_t& 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;
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case OpCode_Subrs:
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dictval.subrsOffset = env.argStack.pop_uint ();
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env.clear_args ();
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break;
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default:
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SUPER::process_op (op, env);
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if (!env.argStack.is_empty ()) return;
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break;
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}
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if (unlikely (env.in_error ())) return;
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dictval.add_op (op, env.str_ref);
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}
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private:
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typedef dict_opset_t SUPER;
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};
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typedef dict_interpreter_t<cff2_top_dict_opset_t, cff2_top_dict_values_t> cff2_top_dict_interpreter_t;
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typedef dict_interpreter_t<cff2_font_dict_opset_t, cff2_font_dict_values_t> cff2_font_dict_interpreter_t;
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struct CFF2FDArray : FDArray<HBUINT32>
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{
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/* FDArray::serialize does not compile without this partial specialization */
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template <typename ITER, typename OP_SERIALIZER>
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bool serialize (hb_serialize_context_t *c, ITER it, OP_SERIALIZER& opszr)
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{ return FDArray<HBUINT32>::serialize<cff2_font_dict_values_t, table_info_t> (c, it, opszr); }
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};
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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 constexpr hb_tag_t tableTag = HB_OT_TAG_cff2;
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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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accelerator_templ_t (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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goto fail;
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{ /* parse top dict */
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hb_ubytes_t topDictStr = (cff2 + cff2->topDict).as_ubytes (cff2->topDictSize);
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if (unlikely (!topDictStr.sanitize (&sc))) goto fail;
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num_interp_env_t env (topDictStr);
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cff2_top_dict_interpreter_t top_interp (env);
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topDict.init ();
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if (unlikely (!top_interp.interpret (topDict))) goto fail;
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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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(globalSubrs == &Null (CFF2Subrs)) || unlikely (!globalSubrs->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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goto fail;
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num_glyphs = charStrings->count;
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if (num_glyphs != sc.get_num_glyphs ())
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goto fail;
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fdCount = fdArray->count;
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if (!privateDicts.resize (fdCount))
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goto fail;
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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 hb_ubytes_t fontDictStr = (*fdArray)[i];
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if (unlikely (!fontDictStr.sanitize (&sc))) goto fail;
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cff2_font_dict_values_t *font;
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num_interp_env_t env (fontDictStr);
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cff2_font_dict_interpreter_t font_interp (env);
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font = fontDicts.push ();
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if (unlikely (font == &Crap (cff2_font_dict_values_t))) goto fail;
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font->init ();
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if (unlikely (!font_interp.interpret (*font))) goto fail;
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const hb_ubytes_t privDictStr = StructAtOffsetOrNull<UnsizedByteStr> (cff2, font->privateDictInfo.offset).as_ubytes (font->privateDictInfo.size);
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if (unlikely (!privDictStr.sanitize (&sc))) goto fail;
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cff2_priv_dict_interp_env_t env2 (privDictStr);
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dict_interpreter_t<PRIVOPSET, PRIVDICTVAL, cff2_priv_dict_interp_env_t> priv_interp (env2);
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privateDicts[i].init ();
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if (unlikely (!priv_interp.interpret (privateDicts[i]))) goto fail;
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privateDicts[i].localSubrs = &StructAtOffsetOrNull<CFF2Subrs> (&privDictStr[0], 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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goto fail;
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}
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return;
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fail:
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_fini ();
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}
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~accelerator_templ_t () { _fini (); }
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void _fini ()
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{
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sc.end_processing ();
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topDict.fini ();
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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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bool is_valid () const { return blob; }
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protected:
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hb_blob_t *blob = nullptr;
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hb_sanitize_context_t sc;
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public:
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cff2_top_dict_values_t topDict;
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const CFF2Subrs *globalSubrs = nullptr;
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const CFF2VariationStore *varStore = nullptr;
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const CFF2CharStrings *charStrings = nullptr;
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const CFF2FDArray *fdArray = nullptr;
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const CFF2FDSelect *fdSelect = nullptr;
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unsigned int fdCount = 0;
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hb_vector_t<cff2_font_dict_values_t> fontDicts;
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hb_vector_t<PRIVDICTVAL> privateDicts;
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unsigned int num_glyphs = 0;
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};
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struct accelerator_t : accelerator_templ_t<cff2_private_dict_opset_t, cff2_private_dict_values_t>
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{
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accelerator_t (hb_face_t *face) : accelerator_templ_t (face) {}
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HB_INTERNAL bool get_extents (hb_font_t *font,
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hb_codepoint_t glyph,
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hb_glyph_extents_t *extents) const;
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HB_INTERNAL bool get_path (hb_font_t *font, hb_codepoint_t glyph, hb_draw_session_t &draw_session) const;
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};
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typedef accelerator_templ_t<cff2_private_dict_opset_subset_t, cff2_private_dict_values_subset_t> accelerator_subset_t;
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bool subset (hb_subset_context_t *c) const { return hb_subset_cff2 (c); }
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public:
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FixedVersion<HBUINT8> version; /* Version of CFF2 table. set to 0x0200u */
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NNOffsetTo<TopDict, HBUINT8> topDict; /* headerSize = Offset to Top DICT. */
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HBUINT16 topDictSize; /* Top DICT size */
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public:
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DEFINE_SIZE_STATIC (5);
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};
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struct cff2_accelerator_t : cff2::accelerator_t {
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cff2_accelerator_t (hb_face_t *face) : cff2::accelerator_t (face) {}
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};
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} /* namespace OT */
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#endif /* HB_OT_CFF2_TABLE_HH */
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