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harfbuzz/src/hb-subset-cff1.cc

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/*
* 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
*/
#include "hb.hh"
#ifndef HB_NO_SUBSET_CFF
#include "hb-open-type.hh"
#include "hb-ot-cff1-table.hh"
#include "hb-set.h"
#include "hb-bimap.hh"
#include "hb-subset-cff1.hh"
#include "hb-subset-plan.hh"
#include "hb-subset-cff-common.hh"
#include "hb-cff1-interp-cs.hh"
using namespace CFF;
struct remap_sid_t : hb_inc_bimap_t
{
unsigned int add (unsigned int sid)
{
if ((sid != CFF_UNDEF_SID) && !is_std_std (sid))
return offset_sid (hb_inc_bimap_t::add (unoffset_sid (sid)));
else
return sid;
}
unsigned int operator[] (unsigned int sid) const
{
if (is_std_std (sid) || (sid == CFF_UNDEF_SID))
return sid;
else
return offset_sid (get (unoffset_sid (sid)));
}
static const unsigned int num_std_strings = 391;
static bool is_std_std (unsigned int sid) { return sid < num_std_strings; }
static unsigned int offset_sid (unsigned int sid) { return sid + num_std_strings; }
static unsigned int unoffset_sid (unsigned int sid) { return sid - num_std_strings; }
};
struct cff1_sub_table_info_t : cff_sub_table_info_t
{
cff1_sub_table_info_t ()
: cff_sub_table_info_t (),
encoding_link (0),
charset_link (0)
{
privateDictInfo.init ();
}
objidx_t encoding_link;
objidx_t charset_link;
table_info_t privateDictInfo;
};
/* a copy of a parsed out cff1_top_dict_values_t augmented with additional operators */
struct cff1_top_dict_values_mod_t : cff1_top_dict_values_t
{
void init (const cff1_top_dict_values_t *base_= &Null (cff1_top_dict_values_t))
{
SUPER::init ();
base = base_;
}
void fini () { SUPER::fini (); }
unsigned get_count () const { return base->get_count () + SUPER::get_count (); }
const cff1_top_dict_val_t &get_value (unsigned int i) const
{
if (i < base->get_count ())
return (*base)[i];
else
return SUPER::values[i - base->get_count ()];
}
const cff1_top_dict_val_t &operator [] (unsigned int i) const { return get_value (i); }
void reassignSIDs (const remap_sid_t& sidmap)
{
for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
nameSIDs[i] = sidmap[base->nameSIDs[i]];
}
protected:
typedef cff1_top_dict_values_t SUPER;
const cff1_top_dict_values_t *base;
};
struct top_dict_modifiers_t
{
top_dict_modifiers_t (const cff1_sub_table_info_t &info_,
const unsigned int (&nameSIDs_)[name_dict_values_t::ValCount])
: info (info_),
nameSIDs (nameSIDs_)
{}
const cff1_sub_table_info_t &info;
const unsigned int (&nameSIDs)[name_dict_values_t::ValCount];
};
struct cff1_top_dict_op_serializer_t : cff_top_dict_op_serializer_t<cff1_top_dict_val_t>
{
bool serialize (hb_serialize_context_t *c,
const cff1_top_dict_val_t &opstr,
const top_dict_modifiers_t &mod) const
{
TRACE_SERIALIZE (this);
op_code_t op = opstr.op;
switch (op)
{
case OpCode_charset:
if (mod.info.charset_link)
return_trace (FontDict::serialize_link4_op(c, op, mod.info.charset_link, whence_t::Absolute));
else
goto fall_back;
case OpCode_Encoding:
if (mod.info.encoding_link)
return_trace (FontDict::serialize_link4_op(c, op, mod.info.encoding_link, whence_t::Absolute));
else
goto fall_back;
case OpCode_Private:
return_trace (UnsizedByteStr::serialize_int2 (c, mod.info.privateDictInfo.size) &&
Dict::serialize_link4_op (c, op, mod.info.privateDictInfo.link, whence_t::Absolute));
case OpCode_version:
case OpCode_Notice:
case OpCode_Copyright:
case OpCode_FullName:
case OpCode_FamilyName:
case OpCode_Weight:
case OpCode_PostScript:
case OpCode_BaseFontName:
case OpCode_FontName:
return_trace (FontDict::serialize_int2_op (c, op, mod.nameSIDs[name_dict_values_t::name_op_to_index (op)]));
case OpCode_ROS:
{
/* for registry & ordering, reassigned SIDs are serialized
* for supplement, the original byte string is copied along with the op code */
op_str_t supp_op;
supp_op.op = op;
if ( unlikely (!(opstr.str.length >= opstr.last_arg_offset + 3)))
return_trace (false);
supp_op.str = hb_ubytes_t (&opstr.str + opstr.last_arg_offset, opstr.str.length - opstr.last_arg_offset);
return_trace (UnsizedByteStr::serialize_int2 (c, mod.nameSIDs[name_dict_values_t::registry]) &&
UnsizedByteStr::serialize_int2 (c, mod.nameSIDs[name_dict_values_t::ordering]) &&
copy_opstr (c, supp_op));
}
fall_back:
default:
return_trace (cff_top_dict_op_serializer_t<cff1_top_dict_val_t>::serialize (c, opstr, mod.info));
}
return_trace (true);
}
};
struct cff1_font_dict_op_serializer_t : cff_font_dict_op_serializer_t
{
bool serialize (hb_serialize_context_t *c,
const op_str_t &opstr,
const cff1_font_dict_values_mod_t &mod) const
{
TRACE_SERIALIZE (this);
if (opstr.op == OpCode_FontName)
return_trace (FontDict::serialize_int2_op (c, opstr.op, mod.fontName));
else
return_trace (SUPER::serialize (c, opstr, mod.privateDictInfo));
}
private:
typedef cff_font_dict_op_serializer_t SUPER;
};
struct cff1_cs_opset_flatten_t : cff1_cs_opset_t<cff1_cs_opset_flatten_t, flatten_param_t>
{
static void flush_args_and_op (op_code_t op, cff1_cs_interp_env_t &env, flatten_param_t& param)
{
if (env.arg_start > 0)
flush_width (env, param);
switch (op)
{
case OpCode_hstem:
case OpCode_hstemhm:
case OpCode_vstem:
case OpCode_vstemhm:
case OpCode_hintmask:
case OpCode_cntrmask:
case OpCode_dotsection:
if (param.drop_hints)
{
env.clear_args ();
return;
}
HB_FALLTHROUGH;
default:
SUPER::flush_args_and_op (op, env, param);
break;
}
}
static void flush_args (cff1_cs_interp_env_t &env, flatten_param_t& param)
{
str_encoder_t encoder (param.flatStr);
for (unsigned int i = env.arg_start; i < env.argStack.get_count (); i++)
encoder.encode_num (env.eval_arg (i));
SUPER::flush_args (env, param);
}
static void flush_op (op_code_t op, cff1_cs_interp_env_t &env, flatten_param_t& param)
{
str_encoder_t encoder (param.flatStr);
encoder.encode_op (op);
}
static void flush_width (cff1_cs_interp_env_t &env, flatten_param_t& param)
{
assert (env.has_width);
str_encoder_t encoder (param.flatStr);
encoder.encode_num (env.width);
}
static void flush_hintmask (op_code_t op, cff1_cs_interp_env_t &env, flatten_param_t& param)
{
SUPER::flush_hintmask (op, env, param);
if (!param.drop_hints)
{
str_encoder_t encoder (param.flatStr);
for (unsigned int i = 0; i < env.hintmask_size; i++)
encoder.encode_byte (env.str_ref[i]);
}
}
private:
typedef cff1_cs_opset_t<cff1_cs_opset_flatten_t, flatten_param_t> SUPER;
};
struct range_list_t : hb_vector_t<code_pair_t>
{
/* replace the first glyph ID in the "glyph" field each range with a nLeft value */
bool complete (unsigned int last_glyph)
{
bool two_byte = false;
for (unsigned int i = (*this).length; i > 0; i--)
{
code_pair_t &pair = (*this)[i - 1];
unsigned int nLeft = last_glyph - pair.glyph - 1;
if (nLeft >= 0x100)
two_byte = true;
last_glyph = pair.glyph;
pair.glyph = nLeft;
}
return two_byte;
}
};
struct cff1_cs_opset_subr_subset_t : cff1_cs_opset_t<cff1_cs_opset_subr_subset_t, subr_subset_param_t>
{
static void process_op (op_code_t op, cff1_cs_interp_env_t &env, subr_subset_param_t& param)
{
switch (op) {
case OpCode_return:
param.current_parsed_str->add_op (op, env.str_ref);
param.current_parsed_str->set_parsed ();
env.return_from_subr ();
param.set_current_str (env, false);
break;
case OpCode_endchar:
param.current_parsed_str->add_op (op, env.str_ref);
param.current_parsed_str->set_parsed ();
SUPER::process_op (op, env, param);
break;
case OpCode_callsubr:
process_call_subr (op, CSType_LocalSubr, env, param, env.localSubrs, param.local_closure);
break;
case OpCode_callgsubr:
process_call_subr (op, CSType_GlobalSubr, env, param, env.globalSubrs, param.global_closure);
break;
default:
SUPER::process_op (op, env, param);
param.current_parsed_str->add_op (op, env.str_ref);
break;
}
}
protected:
static void process_call_subr (op_code_t op, cs_type_t type,
cff1_cs_interp_env_t &env, subr_subset_param_t& param,
cff1_biased_subrs_t& subrs, hb_set_t *closure)
{
byte_str_ref_t str_ref = env.str_ref;
env.call_subr (subrs, type);
param.current_parsed_str->add_call_op (op, str_ref, env.context.subr_num);
closure->add (env.context.subr_num);
param.set_current_str (env, true);
}
private:
typedef cff1_cs_opset_t<cff1_cs_opset_subr_subset_t, subr_subset_param_t> SUPER;
};
struct cff1_subr_subsetter_t : subr_subsetter_t<cff1_subr_subsetter_t, CFF1Subrs, const OT::cff1::accelerator_subset_t, cff1_cs_interp_env_t, cff1_cs_opset_subr_subset_t, OpCode_endchar>
{
cff1_subr_subsetter_t (const OT::cff1::accelerator_subset_t &acc_, const hb_subset_plan_t *plan_)
: subr_subsetter_t (acc_, plan_) {}
static void complete_parsed_str (cff1_cs_interp_env_t &env, subr_subset_param_t& param, parsed_cs_str_t &charstring)
{
/* insert width at the beginning of the charstring as necessary */
if (env.has_width)
charstring.set_prefix (env.width);
/* subroutines/charstring left on the call stack are legally left unmarked
* unmarked when a subroutine terminates with endchar. mark them.
*/
param.current_parsed_str->set_parsed ();
for (unsigned int i = 0; i < env.callStack.get_count (); i++)
{
parsed_cs_str_t *parsed_str = param.get_parsed_str_for_context (env.callStack[i]);
if (likely (parsed_str))
parsed_str->set_parsed ();
else
env.set_error ();
}
}
};
struct cff_subset_plan {
cff_subset_plan ()
{
for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
topDictModSIDs[i] = CFF_UNDEF_SID;
}
void plan_subset_encoding (const OT::cff1::accelerator_subset_t &acc, hb_subset_plan_t *plan)
{
const Encoding *encoding = acc.encoding;
unsigned int size0, size1;
hb_codepoint_t code, last_code = CFF_UNDEF_CODE;
hb_vector_t<hb_codepoint_t> supp_codes;
if (unlikely (!subset_enc_code_ranges.resize (0)))
{
plan->check_success (false);
return;
}
supp_codes.init ();
subset_enc_num_codes = plan->num_output_glyphs () - 1;
unsigned int glyph;
for (glyph = 1; glyph < plan->num_output_glyphs (); glyph++)
{
hb_codepoint_t old_glyph;
if (!plan->old_gid_for_new_gid (glyph, &old_glyph))
{
/* Retain the code for the old missing glyph ID */
old_glyph = glyph;
}
code = acc.glyph_to_code (old_glyph);
if (code == CFF_UNDEF_CODE)
{
subset_enc_num_codes = glyph - 1;
break;
}
if ((last_code == CFF_UNDEF_CODE) || (code != last_code + 1))
{
code_pair_t pair = { code, glyph };
subset_enc_code_ranges.push (pair);
}
last_code = code;
if (encoding != &Null (Encoding))
{
hb_codepoint_t sid = acc.glyph_to_sid (old_glyph);
encoding->get_supplement_codes (sid, supp_codes);
for (unsigned int i = 0; i < supp_codes.length; i++)
{
code_pair_t pair = { supp_codes[i], sid };
subset_enc_supp_codes.push (pair);
}
}
}
supp_codes.fini ();
subset_enc_code_ranges.complete (glyph);
assert (subset_enc_num_codes <= 0xFF);
size0 = Encoding0::min_size + HBUINT8::static_size * subset_enc_num_codes;
size1 = Encoding1::min_size + Encoding1_Range::static_size * subset_enc_code_ranges.length;
if (size0 < size1)
subset_enc_format = 0;
else
subset_enc_format = 1;
}
void plan_subset_charset (const OT::cff1::accelerator_subset_t &acc, hb_subset_plan_t *plan)
{
unsigned int size0, size_ranges;
hb_codepoint_t sid, last_sid = CFF_UNDEF_CODE;
if (unlikely (!subset_charset_ranges.resize (0)))
{
plan->check_success (false);
return;
}
unsigned int glyph;
for (glyph = 1; glyph < plan->num_output_glyphs (); glyph++)
{
hb_codepoint_t old_glyph;
if (!plan->old_gid_for_new_gid (glyph, &old_glyph))
{
/* Retain the SID for the old missing glyph ID */
old_glyph = glyph;
}
sid = acc.glyph_to_sid (old_glyph);
if (!acc.is_CID ())
sid = sidmap.add (sid);
if ((last_sid == CFF_UNDEF_CODE) || (sid != last_sid + 1))
{
code_pair_t pair = { sid, glyph };
subset_charset_ranges.push (pair);
}
last_sid = sid;
}
bool two_byte = subset_charset_ranges.complete (glyph);
size0 = Charset0::min_size + HBUINT16::static_size * (plan->num_output_glyphs () - 1);
if (!two_byte)
size_ranges = Charset1::min_size + Charset1_Range::static_size * subset_charset_ranges.length;
else
size_ranges = Charset2::min_size + Charset2_Range::static_size * subset_charset_ranges.length;
if (size0 < size_ranges)
subset_charset_format = 0;
else if (!two_byte)
subset_charset_format = 1;
else
subset_charset_format = 2;
}
bool collect_sids_in_dicts (const OT::cff1::accelerator_subset_t &acc)
{
sidmap.reset ();
for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
{
unsigned int sid = acc.topDict.nameSIDs[i];
if (sid != CFF_UNDEF_SID)
{
(void)sidmap.add (sid);
topDictModSIDs[i] = sidmap[sid];
}
}
if (acc.fdArray != &Null (CFF1FDArray))
for (unsigned int i = 0; i < orig_fdcount; i++)
if (fdmap.has (i))
(void)sidmap.add (acc.fontDicts[i].fontName);
return true;
}
bool create (const OT::cff1::accelerator_subset_t &acc,
hb_subset_plan_t *plan)
{
/* make sure notdef is first */
hb_codepoint_t old_glyph;
if (!plan->old_gid_for_new_gid (0, &old_glyph) || (old_glyph != 0)) return false;
num_glyphs = plan->num_output_glyphs ();
orig_fdcount = acc.fdCount;
drop_hints = plan->flags & HB_SUBSET_FLAGS_NO_HINTING;
desubroutinize = plan->flags & HB_SUBSET_FLAGS_DESUBROUTINIZE;
/* check whether the subset renumbers any glyph IDs */
gid_renum = false;
for (hb_codepoint_t new_glyph = 0; new_glyph < plan->num_output_glyphs (); new_glyph++)
{
if (!plan->old_gid_for_new_gid(new_glyph, &old_glyph))
continue;
if (new_glyph != old_glyph) {
gid_renum = true;
break;
}
}
subset_charset = gid_renum || !acc.is_predef_charset ();
subset_encoding = !acc.is_CID() && !acc.is_predef_encoding ();
/* top dict INDEX */
{
/* Add encoding/charset to a (copy of) top dict as necessary */
topdict_mod.init (&acc.topDict);
bool need_to_add_enc = (subset_encoding && !acc.topDict.has_op (OpCode_Encoding));
bool need_to_add_set = (subset_charset && !acc.topDict.has_op (OpCode_charset));
if (need_to_add_enc || need_to_add_set)
{
if (need_to_add_enc)
topdict_mod.add_op (OpCode_Encoding);
if (need_to_add_set)
topdict_mod.add_op (OpCode_charset);
}
}
/* Determine re-mapping of font index as fdmap among other info */
if (acc.fdSelect != &Null (CFF1FDSelect))
{
if (unlikely (!hb_plan_subset_cff_fdselect (plan,
orig_fdcount,
*acc.fdSelect,
subset_fdcount,
info.fd_select.size,
subset_fdselect_format,
subset_fdselect_ranges,
fdmap)))
return false;
}
else
fdmap.identity (1);
/* remove unused SIDs & reassign SIDs */
{
/* SIDs for name strings in dicts are added before glyph names so they fit in 16-bit int range */
if (unlikely (!collect_sids_in_dicts (acc)))
return false;
if (unlikely (sidmap.get_population () > 0x8000)) /* assumption: a dict won't reference that many strings */
return false;
if (subset_charset) plan_subset_charset (acc, plan);
topdict_mod.reassignSIDs (sidmap);
}
if (desubroutinize)
{
/* Flatten global & local subrs */
subr_flattener_t<const OT::cff1::accelerator_subset_t, cff1_cs_interp_env_t, cff1_cs_opset_flatten_t, OpCode_endchar>
flattener(acc, plan);
if (!flattener.flatten (subset_charstrings))
return false;
}
else
{
cff1_subr_subsetter_t subr_subsetter (acc, plan);
/* Subset subrs: collect used subroutines, leaving all unused ones behind */
if (!subr_subsetter.subset ())
return false;
/* encode charstrings, global subrs, local subrs with new subroutine numbers */
if (!subr_subsetter.encode_charstrings (subset_charstrings))
return false;
if (!subr_subsetter.encode_globalsubrs (subset_globalsubrs))
return false;
/* local subrs */
if (!subset_localsubrs.resize (orig_fdcount))
return false;
for (unsigned int fd = 0; fd < orig_fdcount; fd++)
{
subset_localsubrs[fd].init ();
if (fdmap.has (fd))
{
if (!subr_subsetter.encode_localsubrs (fd, subset_localsubrs[fd]))
return false;
}
}
}
/* Encoding */
if (subset_encoding)
plan_subset_encoding (acc, plan);
/* private dicts & local subrs */
if (!acc.is_CID ())
fontdicts_mod.push (cff1_font_dict_values_mod_t ());
else
{
+ hb_iter (acc.fontDicts)
| hb_filter ([&] (const cff1_font_dict_values_t &_)
{ return fdmap.has (&_ - &acc.fontDicts[0]); } )
| hb_map ([&] (const cff1_font_dict_values_t &_)
{
cff1_font_dict_values_mod_t mod;
mod.init (&_, sidmap[_.fontName]);
return mod;
})
| hb_sink (fontdicts_mod)
;
}
return ((subset_charstrings.length == plan->num_output_glyphs ())
&& (fontdicts_mod.length == subset_fdcount));
}
cff1_top_dict_values_mod_t topdict_mod;
cff1_sub_table_info_t info;
unsigned int num_glyphs;
unsigned int orig_fdcount = 0;
unsigned int subset_fdcount = 1;
unsigned int subset_fdselect_format = 0;
hb_vector_t<code_pair_t> subset_fdselect_ranges;
/* font dict index remap table from fullset FDArray to subset FDArray.
* set to CFF_UNDEF_CODE if excluded from subset */
hb_inc_bimap_t fdmap;
str_buff_vec_t subset_charstrings;
str_buff_vec_t subset_globalsubrs;
hb_vector_t<str_buff_vec_t> subset_localsubrs;
hb_vector_t<cff1_font_dict_values_mod_t> fontdicts_mod;
bool drop_hints = false;
bool gid_renum;
bool subset_encoding;
uint8_t subset_enc_format;
unsigned int subset_enc_num_codes;
range_list_t subset_enc_code_ranges;
hb_vector_t<code_pair_t> subset_enc_supp_codes;
uint8_t subset_charset_format;
range_list_t subset_charset_ranges;
bool subset_charset;
remap_sid_t sidmap;
unsigned int topDictModSIDs[name_dict_values_t::ValCount];
bool desubroutinize = false;
};
static bool _serialize_cff1 (hb_serialize_context_t *c,
cff_subset_plan &plan,
const OT::cff1::accelerator_subset_t &acc,
unsigned int num_glyphs)
{
/* private dicts & local subrs */
for (int i = (int)acc.privateDicts.length; --i >= 0 ;)
{
if (plan.fdmap.has (i))
{
objidx_t subrs_link = 0;
if (plan.subset_localsubrs[i].length > 0)
{
CFF1Subrs *dest = c->start_embed <CFF1Subrs> ();
if (unlikely (!dest)) return false;
c->push ();
if (likely (dest && dest->serialize (c, plan.subset_localsubrs[i])))
subrs_link = c->pop_pack ();
else
{
c->pop_discard ();
return false;
}
}
PrivateDict *pd = c->start_embed<PrivateDict> ();
if (unlikely (!pd)) return false;
c->push ();
cff_private_dict_op_serializer_t privSzr (plan.desubroutinize, plan.drop_hints);
/* N.B. local subrs immediately follows its corresponding private dict. i.e., subr offset == private dict size */
if (likely (pd->serialize (c, acc.privateDicts[i], privSzr, subrs_link)))
{
unsigned fd = plan.fdmap[i];
plan.fontdicts_mod[fd].privateDictInfo.size = c->length ();
plan.fontdicts_mod[fd].privateDictInfo.link = c->pop_pack ();
}
else
{
c->pop_discard ();
return false;
}
}
}
if (!acc.is_CID ())
plan.info.privateDictInfo = plan.fontdicts_mod[0].privateDictInfo;
/* CharStrings */
{
CFF1CharStrings *cs = c->start_embed<CFF1CharStrings> ();
if (unlikely (!cs)) return false;
c->push ();
if (likely (cs->serialize (c, plan.subset_charstrings)))
plan.info.char_strings_link = c->pop_pack ();
else
{
c->pop_discard ();
return false;
}
}
/* FDArray (FD Index) */
if (acc.fdArray != &Null (CFF1FDArray))
{
CFF1FDArray *fda = c->start_embed<CFF1FDArray> ();
if (unlikely (!fda)) return false;
c->push ();
cff1_font_dict_op_serializer_t fontSzr;
auto it = + hb_zip (+ hb_iter (plan.fontdicts_mod), + hb_iter (plan.fontdicts_mod));
if (likely (fda->serialize (c, it, fontSzr)))
plan.info.fd_array_link = c->pop_pack (false);
else
{
c->pop_discard ();
return false;
}
}
/* FDSelect */
if (acc.fdSelect != &Null (CFF1FDSelect))
{
c->push ();
if (likely (hb_serialize_cff_fdselect (c, num_glyphs, *acc.fdSelect, acc.fdCount,
plan.subset_fdselect_format, plan.info.fd_select.size,
plan.subset_fdselect_ranges)))
plan.info.fd_select.link = c->pop_pack ();
else
{
c->pop_discard ();
return false;
}
}
/* Charset */
if (plan.subset_charset)
{
Charset *dest = c->start_embed<Charset> ();
if (unlikely (!dest)) return false;
c->push ();
if (likely (dest->serialize (c,
plan.subset_charset_format,
plan.num_glyphs,
plan.subset_charset_ranges)))
plan.info.charset_link = c->pop_pack ();
else
{
c->pop_discard ();
return false;
}
}
/* Encoding */
if (plan.subset_encoding)
{
Encoding *dest = c->start_embed<Encoding> ();
if (unlikely (!dest)) return false;
c->push ();
if (likely (dest->serialize (c,
plan.subset_enc_format,
plan.subset_enc_num_codes,
plan.subset_enc_code_ranges,
plan.subset_enc_supp_codes)))
plan.info.encoding_link = c->pop_pack ();
else
{
c->pop_discard ();
return false;
}
}
/* global subrs */
{
c->push ();
CFF1Subrs *dest = c->start_embed <CFF1Subrs> ();
if (unlikely (!dest)) return false;
if (likely (dest->serialize (c, plan.subset_globalsubrs)))
c->pop_pack ();
else
{
c->pop_discard ();
return false;
}
}
/* String INDEX */
{
CFF1StringIndex *dest = c->start_embed<CFF1StringIndex> ();
if (unlikely (!dest)) return false;
c->push ();
if (likely (dest->serialize (c, *acc.stringIndex, plan.sidmap)))
c->pop_pack ();
else
{
c->pop_discard ();
return false;
}
}
OT::cff1 *cff = c->allocate_min<OT::cff1> ();
if (unlikely (!cff))
return false;
/* header */
cff->version.major = 0x01;
cff->version.minor = 0x00;
cff->nameIndex = cff->min_size;
cff->offSize = 4; /* unused? */
/* name INDEX */
if (unlikely (!(*acc.nameIndex).copy (c))) return false;
/* top dict INDEX */
{
/* serialize singleton TopDict */
TopDict *top = c->start_embed<TopDict> ();
if (!top) return false;
c->push ();
cff1_top_dict_op_serializer_t topSzr;
unsigned top_size = 0;
top_dict_modifiers_t modifier (plan.info, plan.topDictModSIDs);
if (likely (top->serialize (c, plan.topdict_mod, topSzr, modifier)))
{
top_size = c->length ();
c->pop_pack (false);
}
else
{
c->pop_discard ();
return false;
}
/* serialize INDEX header for above */
CFF1Index *dest = c->start_embed<CFF1Index> ();
if (!dest) return false;
return dest->serialize_header (c, hb_iter (hb_array_t<unsigned> (&top_size, 1)));
}
}
static bool
_hb_subset_cff1 (const OT::cff1::accelerator_subset_t &acc,
hb_subset_context_t *c)
{
cff_subset_plan cff_plan;
if (unlikely (!cff_plan.create (acc, c->plan)))
{
DEBUG_MSG(SUBSET, nullptr, "Failed to generate a cff subsetting plan.");
return false;
}
return _serialize_cff1 (c->serializer, cff_plan, acc, c->plan->num_output_glyphs ());
}
bool
hb_subset_cff1 (hb_subset_context_t *c)
{
OT::cff1::accelerator_subset_t acc;
acc.init (c->plan->source);
bool result = likely (acc.is_valid ()) && _hb_subset_cff1 (acc, c);
acc.fini ();
return result;
}
#endif
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