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harfbuzz/src/hb-subset-cff1.cc
Michiharu Ariza 09df17e71b subset HVAR 
Re-implemented & repurposed CFF:remap_t as hb_map2_t (moved to hb-ot-layout-common.hh) for two-way mapping for use by index map subsetting.
Hooked up HVAR subsetter through _subset2.
Some renaming in CFF code.
2019-02-20 15:48:29 -08:00

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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-open-type.hh"
#include "hb-ot-cff1-table.hh"
#include "hb-set.h"
#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_map2_t
{
unsigned int add (unsigned int sid)
{
if ((sid != CFF_UNDEF_SID) && !is_std_std (sid))
return offset_sid (hb_map2_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 (hb_map2_t::operator [] (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_offsets_t : cff_sub_table_offsets_t
{
cff1_sub_table_offsets_t ()
: cff_sub_table_offsets_t (),
nameIndexOffset (0),
encodingOffset (0)
{
stringIndexInfo.init ();
charsetInfo.init ();
privateDictInfo.init ();
}
unsigned int nameIndexOffset;
table_info_t stringIndexInfo;
unsigned int encodingOffset;
table_info_t charsetInfo;
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_offsets_t &offsets_,
const unsigned int (&nameSIDs_)[name_dict_values_t::ValCount])
: offsets (offsets_),
nameSIDs (nameSIDs_)
{}
const cff1_sub_table_offsets_t &offsets;
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:
return_trace (FontDict::serialize_offset4_op(c, op, mod.offsets.charsetInfo.offset));
case OpCode_Encoding:
return_trace (FontDict::serialize_offset4_op(c, op, mod.offsets.encodingOffset));
case OpCode_Private:
{
if (unlikely (!UnsizedByteStr::serialize_int2 (c, mod.offsets.privateDictInfo.size)))
return_trace (false);
if (unlikely (!UnsizedByteStr::serialize_int4 (c, mod.offsets.privateDictInfo.offset)))
return_trace (false);
HBUINT8 *p = c->allocate_size<HBUINT8> (1);
if (unlikely (p == nullptr)) return_trace (false);
p->set (OpCode_Private);
}
break;
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_offset2_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 = byte_str_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));
}
default:
return_trace (cff_top_dict_op_serializer_t<cff1_top_dict_val_t>::serialize (c, opstr, mod.offsets));
}
return_trace (true);
}
unsigned int calculate_serialized_size (const cff1_top_dict_val_t &opstr) const
{
op_code_t op = opstr.op;
switch (op)
{
case OpCode_charset:
case OpCode_Encoding:
return OpCode_Size (OpCode_longintdict) + 4 + OpCode_Size (op);
case OpCode_Private:
return OpCode_Size (OpCode_longintdict) + 4 + OpCode_Size (OpCode_shortint) + 2 + OpCode_Size (OpCode_Private);
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 OpCode_Size (OpCode_shortint) + 2 + OpCode_Size (op);
case OpCode_ROS:
return ((OpCode_Size (OpCode_shortint) + 2) * 2) + (opstr.str.length - opstr.last_arg_offset)/* supplement + op */;
default:
return cff_top_dict_op_serializer_t<cff1_top_dict_val_t>::calculate_serialized_size (opstr);
}
}
};
struct font_dict_values_mod_t
{
void init (const cff1_font_dict_values_t *base_,
unsigned int fontName_,
const table_info_t &privateDictInfo_)
{
base = base_;
fontName = fontName_;
privateDictInfo = privateDictInfo_;
}
unsigned get_count () const { return base->get_count (); }
const op_str_t &operator [] (unsigned int i) const { return (*base)[i]; }
const cff1_font_dict_values_t *base;
table_info_t privateDictInfo;
unsigned int fontName;
};
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 font_dict_values_mod_t &mod) const
{
TRACE_SERIALIZE (this);
if (opstr.op == OpCode_FontName)
return_trace (FontDict::serialize_uint2_op (c, opstr.op, mod.fontName));
else
return_trace (SUPER::serialize (c, opstr, mod.privateDictInfo));
}
unsigned int calculate_serialized_size (const op_str_t &opstr) const
{
if (opstr.op == OpCode_FontName)
return OpCode_Size (OpCode_shortint) + 2 + OpCode_Size (OpCode_FontName);
else
return SUPER::calculate_serialized_size (opstr);
}
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.returnFromSubr ();
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.callSubr (subrs, type);
param.current_parsed_str->add_call_op (op, str_ref, env.context.subr_num);
hb_set_add (closure, 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 != nullptr))
parsed_str->set_parsed ();
else
env.set_error ();
}
}
};
struct cff_subset_plan {
cff_subset_plan ()
: final_size (0),
offsets (),
orig_fdcount (0),
subset_fdcount (1),
subset_fdselect_format (0),
drop_hints (false),
desubroutinize(false)
{
topdict_sizes.init ();
topdict_sizes.resize (1);
topdict_mod.init ();
subset_fdselect_ranges.init ();
fdmap.init ();
subset_charstrings.init ();
subset_globalsubrs.init ();
subset_localsubrs.init ();
fontdicts_mod.init ();
subset_enc_code_ranges.init ();
subset_enc_supp_codes.init ();
subset_charset_ranges.init ();
sidmap.init ();
for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
topDictModSIDs[i] = CFF_UNDEF_SID;
}
~cff_subset_plan ()
{
topdict_sizes.fini ();
topdict_mod.fini ();
subset_fdselect_ranges.fini ();
fdmap.fini ();
subset_charstrings.fini_deep ();
subset_globalsubrs.fini_deep ();
subset_localsubrs.fini_deep ();
fontdicts_mod.fini ();
subset_enc_code_ranges.fini ();
subset_enc_supp_codes.fini ();
subset_charset_ranges.fini ();
sidmap.fini ();
}
unsigned int plan_subset_encoding (const OT::cff1::accelerator_subset_t &acc, hb_subset_plan_t *plan)
{
const Encoding *encoding = acc.encoding;
unsigned int size0, size1, supp_size;
hb_codepoint_t code, last_code = CFF_UNDEF_CODE;
hb_vector_t<hb_codepoint_t> supp_codes;
subset_enc_code_ranges.resize (0);
supp_size = 0;
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_size += SuppEncoding::static_size * supp_codes.length;
}
}
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;
return Encoding::calculate_serialized_size (
subset_enc_format,
subset_enc_format? subset_enc_code_ranges.length: subset_enc_num_codes,
subset_enc_supp_codes.length);
}
unsigned int 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;
subset_charset_ranges.resize (0);
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;
return Charset::calculate_serialized_size (
subset_charset_format,
subset_charset_format? subset_charset_ranges.length: plan->num_output_glyphs ());
}
bool collect_sids_in_dicts (const OT::cff1::accelerator_subset_t &acc)
{
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;
final_size = 0;
num_glyphs = plan->num_output_glyphs ();
orig_fdcount = acc.fdCount;
drop_hints = plan->drop_hints;
desubroutinize = plan->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 ();
/* CFF header */
final_size += OT::cff1::static_size;
/* Name INDEX */
offsets.nameIndexOffset = final_size;
final_size += acc.nameIndex->get_size ();
/* 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);
}
offsets.topDictInfo.offset = final_size;
cff1_top_dict_op_serializer_t topSzr;
unsigned int topDictSize = TopDict::calculate_serialized_size (topdict_mod, topSzr);
offsets.topDictInfo.offSize = calcOffSize(topDictSize);
if (unlikely (offsets.topDictInfo.offSize > 4))
return false;
final_size += CFF1IndexOf<TopDict>::calculate_serialized_size<cff1_top_dict_values_mod_t>
(offsets.topDictInfo.offSize,
&topdict_mod, 1, topdict_sizes, topSzr);
}
/* 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,
offsets.FDSelectInfo.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_count () > 0x8000)) /* assumption: a dict won't reference that many strings */
return false;
if (subset_charset)
offsets.charsetInfo.size = plan_subset_charset (acc, plan);
topdict_mod.reassignSIDs (sidmap);
}
/* String INDEX */
{
offsets.stringIndexInfo.offset = final_size;
offsets.stringIndexInfo.size = acc.stringIndex->calculate_serialized_size (offsets.stringIndexInfo.offSize, sidmap);
final_size += offsets.stringIndexInfo.size;
}
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;
/* no global/local subroutines */
offsets.globalSubrsInfo.size = CFF1Subrs::calculate_serialized_size (1, 0, 0);
}
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;
/* global subrs */
unsigned int dataSize = subset_globalsubrs.total_size ();
offsets.globalSubrsInfo.offSize = calcOffSize (dataSize);
if (unlikely (offsets.globalSubrsInfo.offSize > 4))
return false;
offsets.globalSubrsInfo.size = CFF1Subrs::calculate_serialized_size (offsets.globalSubrsInfo.offSize, subset_globalsubrs.length, dataSize);
/* local subrs */
if (!offsets.localSubrsInfos.resize (orig_fdcount))
return false;
if (!subset_localsubrs.resize (orig_fdcount))
return false;
for (unsigned int fd = 0; fd < orig_fdcount; fd++)
{
subset_localsubrs[fd].init ();
offsets.localSubrsInfos[fd].init ();
if (fdmap.has (fd))
{
if (!subr_subsetter.encode_localsubrs (fd, subset_localsubrs[fd]))
return false;
unsigned int dataSize = subset_localsubrs[fd].total_size ();
if (dataSize > 0)
{
offsets.localSubrsInfos[fd].offset = final_size;
offsets.localSubrsInfos[fd].offSize = calcOffSize (dataSize);
if (unlikely (offsets.localSubrsInfos[fd].offSize > 4))
return false;
offsets.localSubrsInfos[fd].size = CFF1Subrs::calculate_serialized_size (offsets.localSubrsInfos[fd].offSize, subset_localsubrs[fd].length, dataSize);
}
}
}
}
/* global subrs */
offsets.globalSubrsInfo.offset = final_size;
final_size += offsets.globalSubrsInfo.size;
/* Encoding */
if (!subset_encoding)
offsets.encodingOffset = acc.topDict.EncodingOffset;
else
{
offsets.encodingOffset = final_size;
final_size += plan_subset_encoding (acc, plan);
}
/* Charset */
if (!subset_charset && acc.is_predef_charset ())
offsets.charsetInfo.offset = acc.topDict.CharsetOffset;
else
offsets.charsetInfo.offset = final_size;
final_size += offsets.charsetInfo.size;
/* FDSelect */
if (acc.fdSelect != &Null(CFF1FDSelect))
{
offsets.FDSelectInfo.offset = final_size;
final_size += offsets.FDSelectInfo.size;
}
/* FDArray (FDIndex) */
if (acc.fdArray != &Null(CFF1FDArray)) {
offsets.FDArrayInfo.offset = final_size;
cff1_font_dict_op_serializer_t fontSzr;
unsigned int dictsSize = 0;
for (unsigned int i = 0; i < acc.fontDicts.length; i++)
if (fdmap.has (i))
dictsSize += FontDict::calculate_serialized_size (acc.fontDicts[i], fontSzr);
offsets.FDArrayInfo.offSize = calcOffSize (dictsSize);
if (unlikely (offsets.FDArrayInfo.offSize > 4))
return false;
final_size += CFF1Index::calculate_serialized_size (offsets.FDArrayInfo.offSize, subset_fdcount, dictsSize);
}
/* CharStrings */
{
offsets.charStringsInfo.offset = final_size;
unsigned int dataSize = subset_charstrings.total_size ();
offsets.charStringsInfo.offSize = calcOffSize (dataSize);
if (unlikely (offsets.charStringsInfo.offSize > 4))
return false;
final_size += CFF1CharStrings::calculate_serialized_size (offsets.charStringsInfo.offSize, plan->num_output_glyphs (), dataSize);
}
/* private dicts & local subrs */
offsets.privateDictInfo.offset = final_size;
for (unsigned int i = 0; i < orig_fdcount; i++)
{
if (fdmap.has (i))
{
bool has_localsubrs = offsets.localSubrsInfos[i].size > 0;
cff_private_dict_op_serializer_t privSzr (desubroutinize, plan->drop_hints);
unsigned int priv_size = PrivateDict::calculate_serialized_size (acc.privateDicts[i], privSzr, has_localsubrs);
table_info_t privInfo = { final_size, priv_size, 0 };
font_dict_values_mod_t fontdict_mod;
if (!acc.is_CID ())
fontdict_mod.init ( &Null(cff1_font_dict_values_t), CFF_UNDEF_SID, privInfo );
else
fontdict_mod.init ( &acc.fontDicts[i], sidmap[acc.fontDicts[i].fontName], privInfo );
fontdicts_mod.push (fontdict_mod);
final_size += privInfo.size;
if (!plan->desubroutinize && has_localsubrs)
{
offsets.localSubrsInfos[i].offset = final_size;
final_size += offsets.localSubrsInfos[i].size;
}
}
}
if (!acc.is_CID ())
offsets.privateDictInfo = fontdicts_mod[0].privateDictInfo;
return ((subset_charstrings.length == plan->num_output_glyphs ())
&& (fontdicts_mod.length == subset_fdcount));
}
unsigned int get_final_size () const { return final_size; }
unsigned int final_size;
hb_vector_t<unsigned int> topdict_sizes;
cff1_top_dict_values_mod_t topdict_mod;
cff1_sub_table_offsets_t offsets;
unsigned int num_glyphs;
unsigned int orig_fdcount;
unsigned int subset_fdcount;
unsigned int subset_fdselect_format;
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_map2_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<font_dict_values_mod_t> fontdicts_mod;
bool drop_hints;
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;
};
static inline bool _write_cff1 (const cff_subset_plan &plan,
const OT::cff1::accelerator_subset_t &acc,
unsigned int num_glyphs,
unsigned int dest_sz,
void *dest)
{
hb_serialize_context_t c (dest, dest_sz);
OT::cff1 *cff = c.start_serialize<OT::cff1> ();
if (unlikely (!c.extend_min (*cff)))
return false;
/* header */
cff->version.major.set (0x01);
cff->version.minor.set (0x00);
cff->nameIndex.set (cff->min_size);
cff->offSize.set (4); /* unused? */
/* name INDEX */
{
assert (cff->nameIndex == (unsigned) (c.head - c.start));
CFF1NameIndex *dest = c.start_embed<CFF1NameIndex> ();
if (unlikely (dest == nullptr)) return false;
if (unlikely (!dest->serialize (&c, *acc.nameIndex)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF name INDEX");
return false;
}
}
/* top dict INDEX */
{
assert (plan.offsets.topDictInfo.offset == (unsigned) (c.head - c.start));
CFF1IndexOf<TopDict> *dest = c.start_embed< CFF1IndexOf<TopDict> > ();
if (dest == nullptr) return false;
cff1_top_dict_op_serializer_t topSzr;
top_dict_modifiers_t modifier (plan.offsets, plan.topDictModSIDs);
if (unlikely (!dest->serialize (&c, plan.offsets.topDictInfo.offSize,
&plan.topdict_mod, 1,
plan.topdict_sizes, topSzr, modifier)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF top dict");
return false;
}
}
/* String INDEX */
{
assert (plan.offsets.stringIndexInfo.offset == (unsigned) (c.head - c.start));
CFF1StringIndex *dest = c.start_embed<CFF1StringIndex> ();
if (unlikely (dest == nullptr)) return false;
if (unlikely (!dest->serialize (&c, *acc.stringIndex, plan.offsets.stringIndexInfo.offSize, plan.sidmap)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF string INDEX");
return false;
}
}
/* global subrs */
{
assert (plan.offsets.globalSubrsInfo.offset != 0);
assert (plan.offsets.globalSubrsInfo.offset == (unsigned) (c.head - c.start));
CFF1Subrs *dest = c.start_embed <CFF1Subrs> ();
if (unlikely (dest == nullptr)) return false;
if (unlikely (!dest->serialize (&c, plan.offsets.globalSubrsInfo.offSize, plan.subset_globalsubrs)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize global subroutines");
return false;
}
}
/* Encoding */
if (plan.subset_encoding)
{
assert (plan.offsets.encodingOffset == (unsigned) (c.head - c.start));
Encoding *dest = c.start_embed<Encoding> ();
if (unlikely (dest == nullptr)) return false;
if (unlikely (!dest->serialize (&c,
plan.subset_enc_format,
plan.subset_enc_num_codes,
plan.subset_enc_code_ranges,
plan.subset_enc_supp_codes)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize Encoding");
return false;
}
}
/* Charset */
if (plan.subset_charset)
{
assert (plan.offsets.charsetInfo.offset == (unsigned) (c.head - c.start));
Charset *dest = c.start_embed<Charset> ();
if (unlikely (dest == nullptr)) return false;
if (unlikely (!dest->serialize (&c,
plan.subset_charset_format,
plan.num_glyphs,
plan.subset_charset_ranges)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize Charset");
return false;
}
}
/* FDSelect */
if (acc.fdSelect != &Null(CFF1FDSelect))
{
assert (plan.offsets.FDSelectInfo.offset == (unsigned) (c.head - c.start));
if (unlikely (!hb_serialize_cff_fdselect (&c, num_glyphs, *acc.fdSelect, acc.fdCount,
plan.subset_fdselect_format, plan.offsets.FDSelectInfo.size,
plan.subset_fdselect_ranges)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF subset FDSelect");
return false;
}
}
/* FDArray (FD Index) */
if (acc.fdArray != &Null(CFF1FDArray))
{
assert (plan.offsets.FDArrayInfo.offset == (unsigned) (c.head - c.start));
CFF1FDArray *fda = c.start_embed<CFF1FDArray> ();
if (unlikely (fda == nullptr)) return false;
cff1_font_dict_op_serializer_t fontSzr;
if (unlikely (!fda->serialize (&c, plan.offsets.FDArrayInfo.offSize,
plan.fontdicts_mod,
fontSzr)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF FDArray");
return false;
}
}
/* CharStrings */
{
assert (plan.offsets.charStringsInfo.offset == (unsigned) (c.head - c.start));
CFF1CharStrings *cs = c.start_embed<CFF1CharStrings> ();
if (unlikely (cs == nullptr)) return false;
if (unlikely (!cs->serialize (&c, plan.offsets.charStringsInfo.offSize, plan.subset_charstrings)))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF CharStrings");
return false;
}
}
/* private dicts & local subrs */
assert (plan.offsets.privateDictInfo.offset == (unsigned) (c.head - c.start));
for (unsigned int i = 0; i < acc.privateDicts.length; i++)
{
if (plan.fdmap.has (i))
{
PrivateDict *pd = c.start_embed<PrivateDict> ();
if (unlikely (pd == nullptr)) return false;
unsigned int priv_size = plan.fontdicts_mod[plan.fdmap[i]].privateDictInfo.size;
bool result;
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 */
unsigned int subroffset = (plan.offsets.localSubrsInfos[i].size > 0)? priv_size: 0;
result = pd->serialize (&c, acc.privateDicts[i], privSzr, subroffset);
if (unlikely (!result))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF Private Dict[%d]", i);
return false;
}
if (plan.offsets.localSubrsInfos[i].size > 0)
{
CFF1Subrs *dest = c.start_embed <CFF1Subrs> ();
if (unlikely (dest == nullptr)) return false;
if (unlikely (!dest->serialize (&c, plan.offsets.localSubrsInfos[i].offSize, plan.subset_localsubrs[i])))
{
DEBUG_MSG (SUBSET, nullptr, "failed to serialize local subroutines");
return false;
}
}
}
}
assert (c.head == c.end);
c.end_serialize ();
return true;
}
static bool
_hb_subset_cff1 (const OT::cff1::accelerator_subset_t &acc,
const char *data,
hb_subset_plan_t *plan,
hb_blob_t **prime /* OUT */)
{
cff_subset_plan cff_plan;
if (unlikely (!cff_plan.create (acc, plan)))
{
DEBUG_MSG(SUBSET, nullptr, "Failed to generate a cff subsetting plan.");
return false;
}
unsigned int cff_prime_size = cff_plan.get_final_size ();
char *cff_prime_data = (char *) calloc (1, cff_prime_size);
if (unlikely (!_write_cff1 (cff_plan, acc, plan->num_output_glyphs (),
cff_prime_size, cff_prime_data))) {
DEBUG_MSG(SUBSET, nullptr, "Failed to write a subset cff.");
free (cff_prime_data);
return false;
}
*prime = hb_blob_create (cff_prime_data,
cff_prime_size,
HB_MEMORY_MODE_READONLY,
cff_prime_data,
free);
return true;
}
/**
* hb_subset_cff1:
* Subsets the CFF table according to a provided plan.
*
* Return value: subsetted cff table.
**/
bool
hb_subset_cff1 (hb_subset_plan_t *plan,
hb_blob_t **prime /* OUT */)
{
hb_blob_t *cff_blob = hb_sanitize_context_t().reference_table<CFF::cff1> (plan->source);
const char *data = hb_blob_get_data(cff_blob, nullptr);
OT::cff1::accelerator_subset_t acc;
acc.init(plan->source);
bool result = likely (acc.is_valid ()) &&
_hb_subset_cff1 (acc, data, plan, prime);
hb_blob_destroy (cff_blob);
acc.fini ();
return result;
}
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