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-rw-r--r--gfx/harfbuzz/src/hb-subset-cff2.cc488
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diff --git a/gfx/harfbuzz/src/hb-subset-cff2.cc b/gfx/harfbuzz/src/hb-subset-cff2.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-cff2-table.hh"
+#include "hb-set.h"
+#include "hb-subset-cff2.hh"
+#include "hb-subset-plan.hh"
+#include "hb-subset-cff-common.hh"
+#include "hb-cff2-interp-cs.hh"
+
+using namespace CFF;
+
+struct cff2_sub_table_info_t : cff_sub_table_info_t
+{
+ cff2_sub_table_info_t ()
+ : cff_sub_table_info_t (),
+ var_store_link (0)
+ {}
+
+ objidx_t var_store_link;
+};
+
+struct cff2_top_dict_op_serializer_t : cff_top_dict_op_serializer_t<>
+{
+ bool serialize (hb_serialize_context_t *c,
+ const op_str_t &opstr,
+ const cff2_sub_table_info_t &info) const
+ {
+ TRACE_SERIALIZE (this);
+
+ switch (opstr.op)
+ {
+ case OpCode_vstore:
+ return_trace (FontDict::serialize_link4_op(c, opstr.op, info.var_store_link));
+
+ default:
+ return_trace (cff_top_dict_op_serializer_t<>::serialize (c, opstr, info));
+ }
+ }
+};
+
+struct cff2_cs_opset_flatten_t : cff2_cs_opset_t<cff2_cs_opset_flatten_t, flatten_param_t>
+{
+ static void flush_args_and_op (op_code_t op, cff2_cs_interp_env_t &env, flatten_param_t& param)
+ {
+ switch (op)
+ {
+ case OpCode_return:
+ case OpCode_endchar:
+ /* dummy opcodes in CFF2. ignore */
+ break;
+
+ case OpCode_hstem:
+ case OpCode_hstemhm:
+ case OpCode_vstem:
+ case OpCode_vstemhm:
+ case OpCode_hintmask:
+ case OpCode_cntrmask:
+ if (param.drop_hints)
+ {
+ env.clear_args ();
+ return;
+ }
+ HB_FALLTHROUGH;
+
+ default:
+ SUPER::flush_args_and_op (op, env, param);
+ break;
+ }
+ }
+
+ static void flush_args (cff2_cs_interp_env_t &env, flatten_param_t& param)
+ {
+ for (unsigned int i = 0; i < env.argStack.get_count ();)
+ {
+ const blend_arg_t &arg = env.argStack[i];
+ if (arg.blending ())
+ {
+ if (unlikely (!((arg.numValues > 0) && (env.argStack.get_count () >= arg.numValues))))
+ {
+ env.set_error ();
+ return;
+ }
+ flatten_blends (arg, i, env, param);
+ i += arg.numValues;
+ }
+ else
+ {
+ str_encoder_t encoder (param.flatStr);
+ encoder.encode_num (arg);
+ i++;
+ }
+ }
+ SUPER::flush_args (env, param);
+ }
+
+ static void flatten_blends (const blend_arg_t &arg, unsigned int i, cff2_cs_interp_env_t &env, flatten_param_t& param)
+ {
+ /* flatten the default values */
+ str_encoder_t encoder (param.flatStr);
+ for (unsigned int j = 0; j < arg.numValues; j++)
+ {
+ const blend_arg_t &arg1 = env.argStack[i + j];
+ if (unlikely (!((arg1.blending () && (arg.numValues == arg1.numValues) && (arg1.valueIndex == j) &&
+ (arg1.deltas.length == env.get_region_count ())))))
+ {
+ env.set_error ();
+ return;
+ }
+ encoder.encode_num (arg1);
+ }
+ /* flatten deltas for each value */
+ for (unsigned int j = 0; j < arg.numValues; j++)
+ {
+ const blend_arg_t &arg1 = env.argStack[i + j];
+ for (unsigned int k = 0; k < arg1.deltas.length; k++)
+ encoder.encode_num (arg1.deltas[k]);
+ }
+ /* flatten the number of values followed by blend operator */
+ encoder.encode_int (arg.numValues);
+ encoder.encode_op (OpCode_blendcs);
+ }
+
+ static void flush_op (op_code_t op, cff2_cs_interp_env_t &env, flatten_param_t& param)
+ {
+ switch (op)
+ {
+ case OpCode_return:
+ case OpCode_endchar:
+ return;
+ default:
+ str_encoder_t encoder (param.flatStr);
+ encoder.encode_op (op);
+ }
+ }
+
+ private:
+ typedef cff2_cs_opset_t<cff2_cs_opset_flatten_t, flatten_param_t> SUPER;
+ typedef cs_opset_t<blend_arg_t, cff2_cs_opset_flatten_t, cff2_cs_opset_flatten_t, cff2_cs_interp_env_t, flatten_param_t> CSOPSET;
+};
+
+struct cff2_cs_opset_subr_subset_t : cff2_cs_opset_t<cff2_cs_opset_subr_subset_t, subr_subset_param_t>
+{
+ static void process_op (op_code_t op, cff2_cs_interp_env_t &env, subr_subset_param_t& param)
+ {
+ switch (op) {
+
+ case OpCode_return:
+ param.current_parsed_str->set_parsed ();
+ env.return_from_subr ();
+ param.set_current_str (env, false);
+ break;
+
+ case OpCode_endchar:
+ 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,
+ cff2_cs_interp_env_t &env, subr_subset_param_t& param,
+ cff2_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 cff2_cs_opset_t<cff2_cs_opset_subr_subset_t, subr_subset_param_t> SUPER;
+};
+
+struct cff2_subr_subsetter_t : subr_subsetter_t<cff2_subr_subsetter_t, CFF2Subrs, const OT::cff2::accelerator_subset_t, cff2_cs_interp_env_t, cff2_cs_opset_subr_subset_t>
+{
+ cff2_subr_subsetter_t (const OT::cff2::accelerator_subset_t &acc_, const hb_subset_plan_t *plan_)
+ : subr_subsetter_t (acc_, plan_) {}
+
+ static void complete_parsed_str (cff2_cs_interp_env_t &env, subr_subset_param_t& param, parsed_cs_str_t &charstring)
+ {
+ /* vsindex is inserted at the beginning of the charstring as necessary */
+ if (env.seen_vsindex ())
+ {
+ number_t ivs;
+ ivs.set_int ((int)env.get_ivs ());
+ charstring.set_prefix (ivs, OpCode_vsindexcs);
+ }
+ }
+};
+
+struct cff2_subset_plan {
+ cff2_subset_plan ()
+ : orig_fdcount (0),
+ subset_fdcount(1),
+ subset_fdselect_size (0),
+ subset_fdselect_format (0),
+ drop_hints (false),
+ desubroutinize (false)
+ {
+ subset_fdselect_ranges.init ();
+ fdmap.init ();
+ subset_charstrings.init ();
+ subset_globalsubrs.init ();
+ subset_localsubrs.init ();
+ }
+
+ ~cff2_subset_plan ()
+ {
+ subset_fdselect_ranges.fini ();
+ fdmap.fini ();
+ subset_charstrings.fini_deep ();
+ subset_globalsubrs.fini_deep ();
+ subset_localsubrs.fini_deep ();
+ }
+
+ bool create (const OT::cff2::accelerator_subset_t &acc,
+ hb_subset_plan_t *plan)
+ {
+ orig_fdcount = acc.fdArray->count;
+
+ drop_hints = plan->drop_hints;
+ desubroutinize = plan->desubroutinize;
+
+ if (desubroutinize)
+ {
+ /* Flatten global & local subrs */
+ subr_flattener_t<const OT::cff2::accelerator_subset_t, cff2_cs_interp_env_t, cff2_cs_opset_flatten_t>
+ flattener(acc, plan);
+ if (!flattener.flatten (subset_charstrings))
+ return false;
+ }
+ else
+ {
+ cff2_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 (!subr_subsetter.encode_localsubrs (fd, subset_localsubrs[fd]))
+ return false;
+ }
+ }
+
+ /* FDSelect */
+ if (acc.fdSelect != &Null (CFF2FDSelect))
+ {
+ if (unlikely (!hb_plan_subset_cff_fdselect (plan,
+ orig_fdcount,
+ *(const FDSelect *)acc.fdSelect,
+ subset_fdcount,
+ subset_fdselect_size,
+ subset_fdselect_format,
+ subset_fdselect_ranges,
+ fdmap)))
+ return false;
+ }
+ else
+ fdmap.identity (1);
+
+ return true;
+ }
+
+ cff2_sub_table_info_t info;
+
+ unsigned int orig_fdcount;
+ unsigned int subset_fdcount;
+ unsigned int subset_fdselect_size;
+ unsigned int subset_fdselect_format;
+ hb_vector_t<code_pair_t> subset_fdselect_ranges;
+
+ 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;
+
+ bool drop_hints;
+ bool desubroutinize;
+};
+
+static bool _serialize_cff2 (hb_serialize_context_t *c,
+ cff2_subset_plan &plan,
+ const OT::cff2::accelerator_subset_t &acc,
+ unsigned int num_glyphs)
+{
+ /* private dicts & local subrs */
+ hb_vector_t<table_info_t> private_dict_infos;
+ if (unlikely (!private_dict_infos.resize (plan.subset_fdcount))) return false;
+
+ 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)
+ {
+ CFF2Subrs *dest = c->start_embed <CFF2Subrs> ();
+ if (unlikely (!dest)) return false;
+ c->push ();
+ if (likely (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);
+ if (likely (pd->serialize (c, acc.privateDicts[i], privSzr, subrs_link)))
+ {
+ unsigned fd = plan.fdmap[i];
+ private_dict_infos[fd].size = c->length ();
+ private_dict_infos[fd].link = c->pop_pack ();
+ }
+ else
+ {
+ c->pop_discard ();
+ return false;
+ }
+ }
+ }
+
+ /* CharStrings */
+ {
+ CFF2CharStrings *cs = c->start_embed<CFF2CharStrings> ();
+ 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;
+ }
+ }
+
+ /* FDSelect */
+ if (acc.fdSelect != &Null (CFF2FDSelect))
+ {
+ c->push ();
+ if (likely (hb_serialize_cff_fdselect (c, num_glyphs, *(const FDSelect *)acc.fdSelect, plan.orig_fdcount,
+ plan.subset_fdselect_format, plan.subset_fdselect_size,
+ plan.subset_fdselect_ranges)))
+ plan.info.fd_select.link = c->pop_pack ();
+ else
+ {
+ c->pop_discard ();
+ return false;
+ }
+ }
+
+ /* FDArray (FD Index) */
+ {
+ c->push ();
+ CFF2FDArray *fda = c->start_embed<CFF2FDArray> ();
+ if (unlikely (!fda)) return false;
+ cff_font_dict_op_serializer_t fontSzr;
+ auto it =
+ + hb_zip (+ hb_iter (acc.fontDicts)
+ | hb_filter ([&] (const cff2_font_dict_values_t &_)
+ { return plan.fdmap.has (&_ - &acc.fontDicts[0]); }),
+ hb_iter (private_dict_infos))
+ ;
+ if (unlikely (!fda->serialize (c, it, fontSzr))) return false;
+ plan.info.fd_array_link = c->pop_pack ();
+ }
+
+ /* variation store */
+ if (acc.varStore != &Null (CFF2VariationStore))
+ {
+ c->push ();
+ CFF2VariationStore *dest = c->start_embed<CFF2VariationStore> ();
+ if (unlikely (!dest || !dest->serialize (c, acc.varStore))) return false;
+ plan.info.var_store_link = c->pop_pack ();
+ }
+
+ OT::cff2 *cff2 = c->allocate_min<OT::cff2> ();
+ if (unlikely (!cff2)) return false;
+
+ /* header */
+ cff2->version.major = 0x02;
+ cff2->version.minor = 0x00;
+ cff2->topDict = OT::cff2::static_size;
+
+ /* top dict */
+ {
+ TopDict &dict = cff2 + cff2->topDict;
+ cff2_top_dict_op_serializer_t topSzr;
+ if (unlikely (!dict.serialize (c, acc.topDict, topSzr, plan.info))) return false;
+ cff2->topDictSize = c->head - (const char *)&dict;
+ }
+
+ /* global subrs */
+ {
+ CFF2Subrs *dest = c->start_embed <CFF2Subrs> ();
+ if (unlikely (!dest)) return false;
+ return dest->serialize (c, plan.subset_globalsubrs);
+ }
+}
+
+static bool
+_hb_subset_cff2 (const OT::cff2::accelerator_subset_t &acc,
+ hb_subset_context_t *c)
+{
+ cff2_subset_plan cff2_plan;
+
+ if (unlikely (!cff2_plan.create (acc, c->plan))) return false;
+ return _serialize_cff2 (c->serializer, cff2_plan, acc, c->plan->num_output_glyphs ());
+}
+
+/**
+ * hb_subset_cff2:
+ * Subsets the CFF2 table according to a provided subset context.
+ **/
+bool
+hb_subset_cff2 (hb_subset_context_t *c)
+{
+ OT::cff2::accelerator_subset_t acc;
+ acc.init (c->plan->source);
+ bool result = likely (acc.is_valid ()) && _hb_subset_cff2 (acc, c);
+ acc.fini ();
+
+ return result;
+}
+
+#endif
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