diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-subset-cff2.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-subset-cff2.cc | 661 |
1 files changed, 661 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-subset-cff2.cc b/gfx/harfbuzz/src/hb-subset-cff2.cc new file mode 100644 index 0000000000..8ab4620194 --- /dev/null +++ b/gfx/harfbuzz/src/hb-subset-cff2.cc @@ -0,0 +1,661 @@ +/* + * 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: + if (info.var_store_link) + return_trace (FontDict::serialize_link4_op(c, opstr.op, info.var_store_link)); + else + return_trace (true); + + 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, blend_arg_t> +{ + static void flush_args_and_op (op_code_t op, cff2_cs_interp_env_t<blend_arg_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<blend_arg_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_cs (arg); + i++; + } + } + SUPER::flush_args (env, param); + } + + static void flatten_blends (const blend_arg_t &arg, unsigned int i, cff2_cs_interp_env_t<blend_arg_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_cs (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_cs (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<blend_arg_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); + } + } + + static void flush_hintmask (op_code_t op, cff2_cs_interp_env_t<blend_arg_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 cff2_cs_opset_t<cff2_cs_opset_flatten_t, flatten_param_t, blend_arg_t> SUPER; + typedef cs_opset_t<blend_arg_t, cff2_cs_opset_flatten_t, cff2_cs_opset_flatten_t, cff2_cs_interp_env_t<blend_arg_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, blend_arg_t> +{ + static void process_op (op_code_t op, cff2_cs_interp_env_t<blend_arg_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<blend_arg_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, blend_arg_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<blend_arg_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<blend_arg_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_private_blend_encoder_param_t +{ + cff2_private_blend_encoder_param_t (hb_serialize_context_t *c, + const CFF2VariationStore *varStore, + hb_array_t<int> normalized_coords) : + c (c), varStore (varStore), normalized_coords (normalized_coords) {} + + void init () {} + + void process_blend () + { + if (!seen_blend) + { + region_count = varStore->varStore.get_region_index_count (ivs); + scalars.resize_exact (region_count); + varStore->varStore.get_region_scalars (ivs, normalized_coords.arrayZ, normalized_coords.length, + &scalars[0], region_count); + seen_blend = true; + } + } + + double blend_deltas (hb_array_t<const number_t> deltas) const + { + double v = 0; + if (likely (scalars.length == deltas.length)) + { + unsigned count = scalars.length; + for (unsigned i = 0; i < count; i++) + v += (double) scalars.arrayZ[i] * deltas.arrayZ[i].to_real (); + } + return v; + } + + + hb_serialize_context_t *c = nullptr; + bool seen_blend = false; + unsigned ivs = 0; + unsigned region_count = 0; + hb_vector_t<float> scalars; + const CFF2VariationStore *varStore = nullptr; + hb_array_t<int> normalized_coords; +}; + +struct cff2_private_dict_blend_opset_t : dict_opset_t +{ + static void process_arg_blend (cff2_private_blend_encoder_param_t& param, + number_t &arg, + const hb_array_t<const number_t> blends, + unsigned n, unsigned i) + { + arg.set_int (round (arg.to_real () + param.blend_deltas (blends))); + } + + static void process_blend (cff2_priv_dict_interp_env_t& env, cff2_private_blend_encoder_param_t& param) + { + unsigned int n, k; + + param.process_blend (); + k = param.region_count; + n = env.argStack.pop_uint (); + /* copy the blend values into blend array of the default values */ + unsigned int start = env.argStack.get_count () - ((k+1) * n); + /* let an obvious error case fail, but note CFF2 spec doesn't forbid n==0 */ + if (unlikely (start > env.argStack.get_count ())) + { + env.set_error (); + return; + } + for (unsigned int i = 0; i < n; i++) + { + const hb_array_t<const number_t> blends = env.argStack.sub_array (start + n + (i * k), k); + process_arg_blend (param, env.argStack[start + i], blends, n, i); + } + + /* pop off blend values leaving default values now adorned with blend values */ + env.argStack.pop (k * n); + } + + static void process_op (op_code_t op, cff2_priv_dict_interp_env_t& env, cff2_private_blend_encoder_param_t& param) + { + switch (op) { + case OpCode_StdHW: + case OpCode_StdVW: + case OpCode_BlueScale: + case OpCode_BlueShift: + case OpCode_BlueFuzz: + case OpCode_ExpansionFactor: + case OpCode_LanguageGroup: + case OpCode_BlueValues: + case OpCode_OtherBlues: + case OpCode_FamilyBlues: + case OpCode_FamilyOtherBlues: + case OpCode_StemSnapH: + case OpCode_StemSnapV: + break; + case OpCode_vsindexdict: + env.process_vsindex (); + param.ivs = env.get_ivs (); + env.clear_args (); + return; + case OpCode_blenddict: + process_blend (env, param); + return; + + default: + dict_opset_t::process_op (op, env); + if (!env.argStack.is_empty ()) return; + break; + } + + if (unlikely (env.in_error ())) return; + + // Write args then op + + str_buff_t str; + str_encoder_t encoder (str); + + unsigned count = env.argStack.get_count (); + for (unsigned i = 0; i < count; i++) + encoder.encode_num_tp (env.argStack[i]); + + encoder.encode_op (op); + + auto bytes = str.as_bytes (); + param.c->embed (&bytes, bytes.length); + + env.clear_args (); + } +}; + +struct cff2_private_dict_op_serializer_t : op_serializer_t +{ + cff2_private_dict_op_serializer_t (bool desubroutinize_, bool drop_hints_, bool pinned_, + const CFF::CFF2VariationStore* varStore_, + hb_array_t<int> normalized_coords_) + : desubroutinize (desubroutinize_), drop_hints (drop_hints_), pinned (pinned_), + varStore (varStore_), normalized_coords (normalized_coords_) {} + + bool serialize (hb_serialize_context_t *c, + const op_str_t &opstr, + objidx_t subrs_link) const + { + TRACE_SERIALIZE (this); + + if (drop_hints && dict_opset_t::is_hint_op (opstr.op)) + return_trace (true); + + if (opstr.op == OpCode_Subrs) + { + if (desubroutinize || !subrs_link) + return_trace (true); + else + return_trace (FontDict::serialize_link2_op (c, opstr.op, subrs_link)); + } + + if (pinned) + { + // Reinterpret opstr and process blends. + cff2_priv_dict_interp_env_t env {hb_ubytes_t (opstr.ptr, opstr.length)}; + cff2_private_blend_encoder_param_t param (c, varStore, normalized_coords); + dict_interpreter_t<cff2_private_dict_blend_opset_t, cff2_private_blend_encoder_param_t, cff2_priv_dict_interp_env_t> interp (env); + return_trace (interp.interpret (param)); + } + + return_trace (copy_opstr (c, opstr)); + } + + protected: + const bool desubroutinize; + const bool drop_hints; + const bool pinned; + const CFF::CFF2VariationStore* varStore; + hb_array_t<int> normalized_coords; +}; + + +struct cff2_subset_plan +{ + bool create (const OT::cff2::accelerator_subset_t &acc, + hb_subset_plan_t *plan) + { + orig_fdcount = acc.fdArray->count; + + drop_hints = plan->flags & HB_SUBSET_FLAGS_NO_HINTING; + pinned = (bool) plan->normalized_coords; + desubroutinize = plan->flags & HB_SUBSET_FLAGS_DESUBROUTINIZE || + pinned; // For instancing we need this path + + if (desubroutinize) + { + /* Flatten global & local subrs */ + subr_flattener_t<const OT::cff2::accelerator_subset_t, cff2_cs_interp_env_t<blend_arg_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, !pinned)) + 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 = 0; + unsigned int subset_fdcount = 1; + unsigned int subset_fdselect_size = 0; + unsigned int subset_fdselect_format = 0; + bool pinned = false; + 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 = false; + bool desubroutinize = false; +}; + +static bool _serialize_cff2 (hb_serialize_context_t *c, + cff2_subset_plan &plan, + const OT::cff2::accelerator_subset_t &acc, + unsigned int num_glyphs, + hb_array_t<int> normalized_coords) +{ + /* 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 (false); + else + { + c->pop_discard (); + return false; + } + } + PrivateDict *pd = c->start_embed<PrivateDict> (); + if (unlikely (!pd)) return false; + c->push (); + cff2_private_dict_op_serializer_t privSzr (plan.desubroutinize, plan.drop_hints, plan.pinned, + acc.varStore, normalized_coords); + 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 */ + { + c->push (); + + unsigned total_size = CFF2CharStrings::total_size (plan.subset_charstrings); + if (unlikely (!c->start_zerocopy (total_size))) + return false; + + CFF2CharStrings *cs = c->start_embed<CFF2CharStrings> (); + if (unlikely (!cs)) return false; + + if (likely (cs->serialize (c, plan.subset_charstrings))) + plan.info.char_strings_link = c->pop_pack (false); + 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 (false); + } + + /* variation store */ + if (acc.varStore != &Null (CFF2VariationStore) && + !plan.pinned) + { + 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 (false); + } + + 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 (), + c->plan->normalized_coords.as_array ()); +} + +bool +hb_subset_cff2 (hb_subset_context_t *c) +{ + OT::cff2::accelerator_subset_t acc (c->plan->source); + return acc.is_valid () && _hb_subset_cff2 (acc, c); +} + +#endif |