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Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset-cff-common.hh')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset-cff-common.hh | 992 |
1 files changed, 992 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset-cff-common.hh b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset-cff-common.hh new file mode 100644 index 00000000000..820a0908509 --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset-cff-common.hh @@ -0,0 +1,992 @@ +/* + * Copyright © 2018 Adobe Inc. + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + * + * Adobe Author(s): Michiharu Ariza + */ + +#ifndef HB_SUBSET_CFF_COMMON_HH +#define HB_SUBSET_CFF_COMMON_HH + +#include "hb.hh" + +#include "hb-subset-plan.hh" +#include "hb-cff-interp-cs-common.hh" + +namespace CFF { + +/* Used for writing a temporary charstring */ +struct StrEncoder +{ + StrEncoder (StrBuff &buff_) + : buff (buff_), error (false) {} + + void reset () { buff.resize (0); } + + void encode_byte (unsigned char b) + { + if (unlikely (buff.push ((const char)b) == &Crap(char))) + set_error (); + } + + void encode_int (int v) + { + if ((-1131 <= v) && (v <= 1131)) + { + if ((-107 <= v) && (v <= 107)) + encode_byte (v + 139); + else if (v > 0) + { + v -= 108; + encode_byte ((v >> 8) + OpCode_TwoBytePosInt0); + encode_byte (v & 0xFF); + } + else + { + v = -v - 108; + encode_byte ((v >> 8) + OpCode_TwoByteNegInt0); + encode_byte (v & 0xFF); + } + } + else + { + if (unlikely (v < -32768)) + v = -32768; + else if (unlikely (v > 32767)) + v = 32767; + encode_byte (OpCode_shortint); + encode_byte ((v >> 8) & 0xFF); + encode_byte (v & 0xFF); + } + } + + void encode_num (const Number& n) + { + if (n.in_int_range ()) + { + encode_int (n.to_int ()); + } + else + { + int32_t v = n.to_fixed (); + encode_byte (OpCode_fixedcs); + encode_byte ((v >> 24) & 0xFF); + encode_byte ((v >> 16) & 0xFF); + encode_byte ((v >> 8) & 0xFF); + encode_byte (v & 0xFF); + } + } + + void encode_op (OpCode op) + { + if (Is_OpCode_ESC (op)) + { + encode_byte (OpCode_escape); + encode_byte (Unmake_OpCode_ESC (op)); + } + else + encode_byte (op); + } + + void copy_str (const ByteStr &str) + { + unsigned int offset = buff.len; + buff.resize (offset + str.len); + if (unlikely (buff.len < offset + str.len)) + { + set_error (); + return; + } + memcpy (&buff[offset], &str.str[0], str.len); + } + + bool is_error () const { return error; } + + protected: + void set_error () { error = true; } + + StrBuff &buff; + bool error; +}; + +struct CFFSubTableOffsets { + CFFSubTableOffsets () : privateDictsOffset (0) + { + topDictInfo.init (); + FDSelectInfo.init (); + FDArrayInfo.init (); + charStringsInfo.init (); + globalSubrsInfo.init (); + localSubrsInfos.init (); + } + + ~CFFSubTableOffsets () { localSubrsInfos.fini (); } + + TableInfo topDictInfo; + TableInfo FDSelectInfo; + TableInfo FDArrayInfo; + TableInfo charStringsInfo; + unsigned int privateDictsOffset; + TableInfo globalSubrsInfo; + hb_vector_t<TableInfo> localSubrsInfos; +}; + +template <typename OPSTR=OpStr> +struct CFFTopDict_OpSerializer : OpSerializer +{ + bool serialize (hb_serialize_context_t *c, + const OPSTR &opstr, + const CFFSubTableOffsets &offsets) const + { + TRACE_SERIALIZE (this); + + switch (opstr.op) + { + case OpCode_CharStrings: + return_trace (FontDict::serialize_offset4_op(c, opstr.op, offsets.charStringsInfo.offset)); + + case OpCode_FDArray: + return_trace (FontDict::serialize_offset4_op(c, opstr.op, offsets.FDArrayInfo.offset)); + + case OpCode_FDSelect: + return_trace (FontDict::serialize_offset4_op(c, opstr.op, offsets.FDSelectInfo.offset)); + + default: + return_trace (copy_opstr (c, opstr)); + } + return_trace (true); + } + + unsigned int calculate_serialized_size (const OPSTR &opstr) const + { + switch (opstr.op) + { + case OpCode_CharStrings: + case OpCode_FDArray: + case OpCode_FDSelect: + return OpCode_Size (OpCode_longintdict) + 4 + OpCode_Size (opstr.op); + + default: + return opstr.str.len; + } + } +}; + +struct CFFFontDict_OpSerializer : OpSerializer +{ + bool serialize (hb_serialize_context_t *c, + const OpStr &opstr, + const TableInfo &privateDictInfo) const + { + TRACE_SERIALIZE (this); + + if (opstr.op == OpCode_Private) + { + /* serialize the private dict size & offset as 2-byte & 4-byte integers */ + if (unlikely (!UnsizedByteStr::serialize_int2 (c, privateDictInfo.size) || + !UnsizedByteStr::serialize_int4 (c, privateDictInfo.offset))) + return_trace (false); + + /* serialize the opcode */ + HBUINT8 *p = c->allocate_size<HBUINT8> (1); + if (unlikely (p == nullptr)) return_trace (false); + p->set (OpCode_Private); + + return_trace (true); + } + else + { + HBUINT8 *d = c->allocate_size<HBUINT8> (opstr.str.len); + if (unlikely (d == nullptr)) return_trace (false); + memcpy (d, &opstr.str.str[0], opstr.str.len); + } + return_trace (true); + } + + unsigned int calculate_serialized_size (const OpStr &opstr) const + { + if (opstr.op == OpCode_Private) + return OpCode_Size (OpCode_longintdict) + 4 + OpCode_Size (OpCode_shortint) + 2 + OpCode_Size (OpCode_Private); + else + return opstr.str.len; + } +}; + +struct CFFPrivateDict_OpSerializer : OpSerializer +{ + CFFPrivateDict_OpSerializer (bool desubroutinize_, bool drop_hints_) + : desubroutinize (desubroutinize_), drop_hints (drop_hints_) {} + + bool serialize (hb_serialize_context_t *c, + const OpStr &opstr, + const unsigned int subrsOffset) const + { + TRACE_SERIALIZE (this); + + if (drop_hints && DictOpSet::is_hint_op (opstr.op)) + return true; + if (opstr.op == OpCode_Subrs) + { + if (desubroutinize || (subrsOffset == 0)) + return_trace (true); + else + return_trace (FontDict::serialize_offset2_op (c, opstr.op, subrsOffset)); + } + else + return_trace (copy_opstr (c, opstr)); + } + + unsigned int calculate_serialized_size (const OpStr &opstr, + bool has_localsubr=true) const + { + if (drop_hints && DictOpSet::is_hint_op (opstr.op)) + return 0; + if (opstr.op == OpCode_Subrs) + { + if (desubroutinize || !has_localsubr) + return 0; + else + return OpCode_Size (OpCode_shortint) + 2 + OpCode_Size (opstr.op); + } + else + return opstr.str.len; + } + + protected: + const bool desubroutinize; + const bool drop_hints; +}; + +struct FlattenParam +{ + StrBuff &flatStr; + bool drop_hints; +}; + +template <typename ACC, typename ENV, typename OPSET> +struct SubrFlattener +{ + SubrFlattener (const ACC &acc_, + const hb_vector_t<hb_codepoint_t> &glyphs_, + bool drop_hints_) + : acc (acc_), + glyphs (glyphs_), + drop_hints (drop_hints_) + {} + + bool flatten (StrBuffArray &flat_charstrings) + { + if (!flat_charstrings.resize (glyphs.len)) + return false; + for (unsigned int i = 0; i < glyphs.len; i++) + flat_charstrings[i].init (); + for (unsigned int i = 0; i < glyphs.len; i++) + { + hb_codepoint_t glyph = glyphs[i]; + const ByteStr str = (*acc.charStrings)[glyph]; + unsigned int fd = acc.fdSelect->get_fd (glyph); + if (unlikely (fd >= acc.fdCount)) + return false; + CSInterpreter<ENV, OPSET, FlattenParam> interp; + interp.env.init (str, acc, fd); + FlattenParam param = { flat_charstrings[i], drop_hints }; + if (unlikely (!interp.interpret (param))) + return false; + } + return true; + } + + const ACC &acc; + const hb_vector_t<hb_codepoint_t> &glyphs; + bool drop_hints; +}; + +struct SubrClosures +{ + SubrClosures () : valid (false), global_closure (nullptr) + { local_closures.init (); } + + void init (unsigned int fd_count) + { + valid = true; + global_closure = hb_set_create (); + if (global_closure == hb_set_get_empty ()) + valid = false; + if (!local_closures.resize (fd_count)) + valid = false; + + for (unsigned int i = 0; i < local_closures.len; i++) + { + local_closures[i] = hb_set_create (); + if (local_closures[i] == hb_set_get_empty ()) + valid = false; + } + } + + void fini () + { + hb_set_destroy (global_closure); + for (unsigned int i = 0; i < local_closures.len; i++) + hb_set_destroy (local_closures[i]); + local_closures.fini (); + } + + void reset () + { + hb_set_clear (global_closure); + for (unsigned int i = 0; i < local_closures.len; i++) + hb_set_clear (local_closures[i]); + } + + bool is_valid () const { return valid; } + bool valid; + hb_set_t *global_closure; + hb_vector_t<hb_set_t *> local_closures; +}; + +struct ParsedCSOp : OpStr +{ + void init (unsigned int subr_num_ = 0) + { + OpStr::init (); + subr_num = subr_num_; + drop_flag = false; + keep_flag = false; + skip_flag = false; + } + + void fini () { OpStr::fini (); } + + bool for_drop () const { return drop_flag; } + void set_drop () { if (!for_keep ()) drop_flag = true; } + + bool for_keep () const { return keep_flag; } + void set_keep () { keep_flag = true; } + + bool for_skip () const { return skip_flag; } + void set_skip () { skip_flag = true; } + + unsigned int subr_num; + + protected: + bool drop_flag : 1; + bool keep_flag : 1; + bool skip_flag : 1; +}; + +struct ParsedCStr : ParsedValues<ParsedCSOp> +{ + void init () + { + SUPER::init (); + parsed = false; + hint_dropped = false; + has_prefix_ = false; + } + + void add_op (OpCode op, const SubByteStr& substr) + { + if (!is_parsed ()) + SUPER::add_op (op, substr); + } + + void add_call_op (OpCode op, const SubByteStr& substr, unsigned int subr_num) + { + if (!is_parsed ()) + { + unsigned int parsed_len = get_count (); + if (likely (parsed_len > 0)) + values[parsed_len-1].set_skip (); + + ParsedCSOp val; + val.init (subr_num); + SUPER::add_op (op, substr, val); + } + } + + void set_prefix (const Number &num, OpCode op = OpCode_Invalid) + { + has_prefix_ = true; + prefix_op_ = op; + prefix_num_ = num; + } + + bool at_end (unsigned int pos) const + { + return ((pos + 1 >= values.len) /* CFF2 */ + || (values[pos + 1].op == OpCode_return)); + } + + bool is_parsed () const { return parsed; } + void set_parsed () { parsed = true; } + + bool is_hint_dropped () const { return hint_dropped; } + void set_hint_dropped () { hint_dropped = true; } + + bool is_vsindex_dropped () const { return vsindex_dropped; } + void set_vsindex_dropped () { vsindex_dropped = true; } + + bool has_prefix () const { return has_prefix_; } + OpCode prefix_op () const { return prefix_op_; } + const Number &prefix_num () const { return prefix_num_; } + + protected: + bool parsed; + bool hint_dropped; + bool vsindex_dropped; + bool has_prefix_; + OpCode prefix_op_; + Number prefix_num_; + + private: + typedef ParsedValues<ParsedCSOp> SUPER; +}; + +struct ParsedCStrs : hb_vector_t<ParsedCStr> +{ + void init (unsigned int len_ = 0) + { + SUPER::init (); + resize (len_); + for (unsigned int i = 0; i < len; i++) + (*this)[i].init (); + } + void fini () { SUPER::fini_deep (); } + + private: + typedef hb_vector_t<ParsedCStr> SUPER; +}; + +struct SubrSubsetParam +{ + void init (ParsedCStr *parsed_charstring_, + ParsedCStrs *parsed_global_subrs_, ParsedCStrs *parsed_local_subrs_, + hb_set_t *global_closure_, hb_set_t *local_closure_, + bool drop_hints_) + { + parsed_charstring = parsed_charstring_; + current_parsed_str = parsed_charstring; + parsed_global_subrs = parsed_global_subrs_; + parsed_local_subrs = parsed_local_subrs_; + global_closure = global_closure_; + local_closure = local_closure_; + drop_hints = drop_hints_; + } + + ParsedCStr *get_parsed_str_for_context (CallContext &context) + { + switch (context.type) + { + case CSType_CharString: + return parsed_charstring; + + case CSType_LocalSubr: + if (likely (context.subr_num < parsed_local_subrs->len)) + return &(*parsed_local_subrs)[context.subr_num]; + break; + + case CSType_GlobalSubr: + if (likely (context.subr_num < parsed_global_subrs->len)) + return &(*parsed_global_subrs)[context.subr_num]; + break; + } + return nullptr; + } + + template <typename ENV> + void set_current_str (ENV &env, bool calling) + { + ParsedCStr *parsed_str = get_parsed_str_for_context (env.context); + if (likely (parsed_str != nullptr)) + { + /* If the called subroutine is parsed partially but not completely yet, + * it must be because we are calling it recursively. + * Handle it as an error. */ + if (unlikely (calling && !parsed_str->is_parsed () && (parsed_str->values.len > 0))) + env.set_error (); + else + current_parsed_str = parsed_str; + } + else + env.set_error (); + } + + ParsedCStr *current_parsed_str; + + ParsedCStr *parsed_charstring; + ParsedCStrs *parsed_global_subrs; + ParsedCStrs *parsed_local_subrs; + hb_set_t *global_closure; + hb_set_t *local_closure; + bool drop_hints; +}; + +struct SubrRemap : Remap +{ + void create (hb_set_t *closure) + { + /* create a remapping of subroutine numbers from old to new. + * no optimization based on usage counts. fonttools doesn't appear doing that either. + */ + reset (closure->get_max () + 1); + for (hb_codepoint_t old_num = 0; old_num < len; old_num++) + { + if (hb_set_has (closure, old_num)) + add (old_num); + } + + if (get_count () < 1240) + bias = 107; + else if (get_count () < 33900) + bias = 1131; + else + bias = 32768; + } + + hb_codepoint_t operator[] (unsigned int old_num) const + { + if (old_num >= len) + return CFF_UNDEF_CODE; + else + return Remap::operator[] (old_num); + } + + int biased_num (unsigned int old_num) const + { + hb_codepoint_t new_num = (*this)[old_num]; + return (int)new_num - bias; + } + + protected: + int bias; +}; + +struct SubrRemaps +{ + SubrRemaps () + { + global_remap.init (); + local_remaps.init (); + } + + ~SubrRemaps () { fini (); } + + void init (unsigned int fdCount) + { + local_remaps.resize (fdCount); + for (unsigned int i = 0; i < fdCount; i++) + local_remaps[i].init (); + } + + void create (SubrClosures& closures) + { + global_remap.create (closures.global_closure); + for (unsigned int i = 0; i < local_remaps.len; i++) + local_remaps[i].create (closures.local_closures[i]); + } + + void fini () + { + global_remap.fini (); + local_remaps.fini_deep (); + } + + SubrRemap global_remap; + hb_vector_t<SubrRemap> local_remaps; +}; + +template <typename SUBSETTER, typename SUBRS, typename ACC, typename ENV, typename OPSET> +struct SubrSubsetter +{ + SubrSubsetter () + { + parsed_charstrings.init (); + parsed_global_subrs.init (); + parsed_local_subrs.init (); + } + + ~SubrSubsetter () + { + closures.fini (); + remaps.fini (); + parsed_charstrings.fini_deep (); + parsed_global_subrs.fini_deep (); + parsed_local_subrs.fini_deep (); + } + + /* Subroutine subsetting with --no-desubroutinize runs in phases: + * + * 1. execute charstrings/subroutines to determine subroutine closures + * 2. parse out all operators and numbers + * 3. mark hint operators and operands for removal if --no-hinting + * 4. re-encode all charstrings and subroutines with new subroutine numbers + * + * Phases #1 and #2 are done at the same time in collect_subrs (). + * Phase #3 walks charstrings/subroutines forward then backward (hence parsing required), + * because we can't tell if a number belongs to a hint op until we see the first moveto. + * + * Assumption: a callsubr/callgsubr operator must immediately follow a (biased) subroutine number + * within the same charstring/subroutine, e.g., not split across a charstring and a subroutine. + */ + bool subset (ACC &acc, const hb_vector_t<hb_codepoint_t> &glyphs, bool drop_hints) + { + closures.init (acc.fdCount); + remaps.init (acc.fdCount); + + parsed_charstrings.init (glyphs.len); + parsed_global_subrs.init (acc.globalSubrs->count); + parsed_local_subrs.resize (acc.fdCount); + for (unsigned int i = 0; i < acc.fdCount; i++) + { + parsed_local_subrs[i].init (acc.privateDicts[i].localSubrs->count); + } + if (unlikely (!closures.valid)) + return false; + + /* phase 1 & 2 */ + for (unsigned int i = 0; i < glyphs.len; i++) + { + hb_codepoint_t glyph = glyphs[i]; + const ByteStr str = (*acc.charStrings)[glyph]; + unsigned int fd = acc.fdSelect->get_fd (glyph); + if (unlikely (fd >= acc.fdCount)) + return false; + + CSInterpreter<ENV, OPSET, SubrSubsetParam> interp; + interp.env.init (str, acc, fd); + + SubrSubsetParam param; + param.init (&parsed_charstrings[i], + &parsed_global_subrs, &parsed_local_subrs[fd], + closures.global_closure, closures.local_closures[fd], + drop_hints); + + if (unlikely (!interp.interpret (param))) + return false; + + /* finalize parsed string esp. copy CFF1 width or CFF2 vsindex to the parsed charstring for encoding */ + SUBSETTER::finalize_parsed_str (interp.env, param, parsed_charstrings[i]); + } + + if (drop_hints) + { + /* mark hint ops and arguments for drop */ + for (unsigned int i = 0; i < glyphs.len; i++) + { + unsigned int fd = acc.fdSelect->get_fd (glyphs[i]); + if (unlikely (fd >= acc.fdCount)) + return false; + SubrSubsetParam param; + param.init (&parsed_charstrings[i], + &parsed_global_subrs, &parsed_local_subrs[fd], + closures.global_closure, closures.local_closures[fd], + drop_hints); + + DropHintsParam drop; + if (drop_hints_in_str (parsed_charstrings[i], param, drop)) + { + parsed_charstrings[i].set_hint_dropped (); + if (drop.vsindex_dropped) + parsed_charstrings[i].set_vsindex_dropped (); + } + } + + /* after dropping hints recreate closures of actually used subrs */ + closures.reset (); + for (unsigned int i = 0; i < glyphs.len; i++) + { + unsigned int fd = acc.fdSelect->get_fd (glyphs[i]); + if (unlikely (fd >= acc.fdCount)) + return false; + SubrSubsetParam param; + param.init (&parsed_charstrings[i], + &parsed_global_subrs, &parsed_local_subrs[fd], + closures.global_closure, closures.local_closures[fd], + drop_hints); + collect_subr_refs_in_str (parsed_charstrings[i], param); + } + } + + remaps.create (closures); + + return true; + } + + bool encode_charstrings (ACC &acc, const hb_vector_t<hb_codepoint_t> &glyphs, StrBuffArray &buffArray) const + { + if (unlikely (!buffArray.resize (glyphs.len))) + return false; + for (unsigned int i = 0; i < glyphs.len; i++) + { + unsigned int fd = acc.fdSelect->get_fd (glyphs[i]); + if (unlikely (fd >= acc.fdCount)) + return false; + if (unlikely (!encode_str (parsed_charstrings[i], fd, buffArray[i]))) + return false; + } + return true; + } + + bool encode_subrs (const ParsedCStrs &subrs, const SubrRemap& remap, unsigned int fd, StrBuffArray &buffArray) const + { + unsigned int count = remap.get_count (); + + if (unlikely (!buffArray.resize (count))) + return false; + for (unsigned int old_num = 0; old_num < subrs.len; old_num++) + { + hb_codepoint_t new_num = remap[old_num]; + if (new_num != CFF_UNDEF_CODE) + { + if (unlikely (!encode_str (subrs[old_num], fd, buffArray[new_num]))) + return false; + } + } + return true; + } + + bool encode_globalsubrs (StrBuffArray &buffArray) + { + return encode_subrs (parsed_global_subrs, remaps.global_remap, 0, buffArray); + } + + bool encode_localsubrs (unsigned int fd, StrBuffArray &buffArray) const + { + return encode_subrs (parsed_local_subrs[fd], remaps.local_remaps[fd], fd, buffArray); + } + + protected: + struct DropHintsParam + { + DropHintsParam () + : seen_moveto (false), + ends_in_hint (false), + vsindex_dropped (false) {} + + bool seen_moveto; + bool ends_in_hint; + bool vsindex_dropped; + }; + + bool drop_hints_in_subr (ParsedCStr &str, unsigned int pos, + ParsedCStrs &subrs, unsigned int subr_num, + const SubrSubsetParam ¶m, DropHintsParam &drop) + { + drop.ends_in_hint = false; + bool has_hint = drop_hints_in_str (subrs[subr_num], param, drop); + + /* if this subr ends with a stem hint (i.e., not a number a potential argument for moveto), + * then this entire subroutine must be a hint. drop its call. */ + if (drop.ends_in_hint) + { + str.values[pos].set_drop (); + /* if this subr call is at the end of the parent subr, propagate the flag + * otherwise reset the flag */ + if (!str.at_end (pos)) + drop.ends_in_hint = false; + } + + return has_hint; + } + + /* returns true if it sees a hint op before the first moveto */ + bool drop_hints_in_str (ParsedCStr &str, const SubrSubsetParam ¶m, DropHintsParam &drop) + { + bool seen_hint = false; + + for (unsigned int pos = 0; pos < str.values.len; pos++) + { + bool has_hint = false; + switch (str.values[pos].op) + { + case OpCode_callsubr: + has_hint = drop_hints_in_subr (str, pos, + *param.parsed_local_subrs, str.values[pos].subr_num, + param, drop); + + break; + + case OpCode_callgsubr: + has_hint = drop_hints_in_subr (str, pos, + *param.parsed_global_subrs, str.values[pos].subr_num, + param, drop); + break; + + case OpCode_rmoveto: + case OpCode_hmoveto: + case OpCode_vmoveto: + drop.seen_moveto = true; + break; + + case OpCode_hintmask: + case OpCode_cntrmask: + if (drop.seen_moveto) + { + str.values[pos].set_drop (); + break; + } + HB_FALLTHROUGH; + + case OpCode_hstemhm: + case OpCode_vstemhm: + case OpCode_hstem: + case OpCode_vstem: + has_hint = true; + str.values[pos].set_drop (); + if (str.at_end (pos)) + drop.ends_in_hint = true; + break; + + case OpCode_dotsection: + str.values[pos].set_drop (); + break; + + default: + /* NONE */ + break; + } + if (has_hint) + { + for (int i = pos - 1; i >= 0; i--) + { + ParsedCSOp &csop = str.values[(unsigned)i]; + if (csop.for_drop ()) + break; + csop.set_drop (); + if (csop.op == OpCode_vsindexcs) + drop.vsindex_dropped = true; + } + seen_hint |= has_hint; + } + } + + return seen_hint; + } + + void collect_subr_refs_in_subr (ParsedCStr &str, unsigned int pos, + unsigned int subr_num, ParsedCStrs &subrs, + hb_set_t *closure, + const SubrSubsetParam ¶m) + { + hb_set_add (closure, subr_num); + collect_subr_refs_in_str (subrs[subr_num], param); + } + + void collect_subr_refs_in_str (ParsedCStr &str, const SubrSubsetParam ¶m) + { + for (unsigned int pos = 0; pos < str.values.len; pos++) + { + if (!str.values[pos].for_drop ()) + { + switch (str.values[pos].op) + { + case OpCode_callsubr: + collect_subr_refs_in_subr (str, pos, + str.values[pos].subr_num, *param.parsed_local_subrs, + param.local_closure, param); + break; + + case OpCode_callgsubr: + collect_subr_refs_in_subr (str, pos, + str.values[pos].subr_num, *param.parsed_global_subrs, + param.global_closure, param); + break; + + default: break; + } + } + } + } + + bool encode_str (const ParsedCStr &str, const unsigned int fd, StrBuff &buff) const + { + buff.init (); + StrEncoder encoder (buff); + encoder.reset (); + /* if a prefix (CFF1 width or CFF2 vsindex) has been removed along with hints, + * re-insert it at the beginning of charstreing */ + if (str.has_prefix () && str.is_hint_dropped ()) + { + encoder.encode_num (str.prefix_num ()); + if (str.prefix_op () != OpCode_Invalid) + encoder.encode_op (str.prefix_op ()); + } + for (unsigned int i = 0; i < str.get_count(); i++) + { + const ParsedCSOp &opstr = str.values[i]; + if (!opstr.for_drop () && !opstr.for_skip ()) + { + switch (opstr.op) + { + case OpCode_callsubr: + encoder.encode_int (remaps.local_remaps[fd].biased_num (opstr.subr_num)); + encoder.encode_op (OpCode_callsubr); + break; + + case OpCode_callgsubr: + encoder.encode_int (remaps.global_remap.biased_num (opstr.subr_num)); + encoder.encode_op (OpCode_callgsubr); + break; + + default: + encoder.copy_str (opstr.str); + break; + } + } + } + return !encoder.is_error (); + } + + protected: + SubrClosures closures; + + ParsedCStrs parsed_charstrings; + ParsedCStrs parsed_global_subrs; + hb_vector_t<ParsedCStrs> parsed_local_subrs; + + SubrRemaps remaps; + + private: + typedef typename SUBRS::count_type subr_count_type; +}; +}; /* namespace CFF */ + +HB_INTERNAL bool +hb_plan_subset_cff_fdselect (const hb_vector_t<hb_codepoint_t> &glyphs, + unsigned int fdCount, + const CFF::FDSelect &src, /* IN */ + unsigned int &subset_fd_count /* OUT */, + unsigned int &subset_fdselect_size /* OUT */, + unsigned int &subset_fdselect_format /* OUT */, + hb_vector_t<CFF::code_pair> &fdselect_ranges /* OUT */, + CFF::Remap &fdmap /* OUT */); + +HB_INTERNAL bool +hb_serialize_cff_fdselect (hb_serialize_context_t *c, + unsigned int num_glyphs, + const CFF::FDSelect &src, + unsigned int fd_count, + unsigned int fdselect_format, + unsigned int size, + const hb_vector_t<CFF::code_pair> &fdselect_ranges); + +#endif /* HB_SUBSET_CFF_COMMON_HH */ |