629 lines
19 KiB
C++
629 lines
19 KiB
C++
/*
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* Copyright © 2018 Adobe Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Adobe Author(s): Michiharu Ariza
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*/
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#include "hb-open-type.hh"
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#include "hb-ot-cff2-table.hh"
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#include "hb-set.h"
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#include "hb-subset-cff2.hh"
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#include "hb-subset-plan.hh"
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#include "hb-subset-cff-common.hh"
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#include "hb-cff2-interp-cs.hh"
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using namespace CFF;
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struct cff2_sub_table_offsets_t : cff_sub_table_offsets_t
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{
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cff2_sub_table_offsets_t ()
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: cff_sub_table_offsets_t (),
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varStoreOffset (0)
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{}
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unsigned int varStoreOffset;
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};
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struct cff2_top_dict_op_serializer_t : cff_top_dict_op_serializer_t<>
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{
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bool serialize (hb_serialize_context_t *c,
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const op_str_t &opstr,
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const cff2_sub_table_offsets_t &offsets) const
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{
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TRACE_SERIALIZE (this);
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switch (opstr.op)
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{
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case OpCode_vstore:
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return_trace (FontDict::serialize_offset4_op(c, opstr.op, offsets.varStoreOffset));
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default:
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return_trace (cff_top_dict_op_serializer_t<>::serialize (c, opstr, offsets));
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}
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}
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unsigned int calculate_serialized_size (const op_str_t &opstr) const
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{
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switch (opstr.op)
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{
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case OpCode_vstore:
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return OpCode_Size (OpCode_longintdict) + 4 + OpCode_Size (opstr.op);
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default:
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return cff_top_dict_op_serializer_t<>::calculate_serialized_size (opstr);
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}
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}
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};
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struct cff2_cs_opset_flatten_t : cff2_cs_opset_t<cff2_cs_opset_flatten_t, flatten_param_t>
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{
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static void flush_args_and_op (op_code_t op, cff2_cs_interp_env_t &env, flatten_param_t& param)
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{
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switch (op)
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{
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case OpCode_return:
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case OpCode_endchar:
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/* dummy opcodes in CFF2. ignore */
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break;
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case OpCode_hstem:
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case OpCode_hstemhm:
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case OpCode_vstem:
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case OpCode_vstemhm:
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case OpCode_hintmask:
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case OpCode_cntrmask:
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if (param.drop_hints)
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{
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env.clear_args ();
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return;
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}
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HB_FALLTHROUGH;
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default:
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SUPER::flush_args_and_op (op, env, param);
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break;
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}
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}
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static void flush_args (cff2_cs_interp_env_t &env, flatten_param_t& param)
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{
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for (unsigned int i = 0; i < env.argStack.get_count ();)
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{
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const blend_arg_t &arg = env.argStack[i];
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if (arg.blending ())
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{
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if (unlikely (!((arg.numValues > 0) && (env.argStack.get_count () >= arg.numValues))))
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{
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env.set_error ();
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return;
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}
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flatten_blends (arg, i, env, param);
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i += arg.numValues;
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}
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else
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{
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str_encoder_t encoder (param.flatStr);
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encoder.encode_num (arg);
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i++;
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}
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}
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SUPER::flush_args (env, param);
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}
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static void flatten_blends (const blend_arg_t &arg, unsigned int i, cff2_cs_interp_env_t &env, flatten_param_t& param)
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{
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/* flatten the default values */
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str_encoder_t encoder (param.flatStr);
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for (unsigned int j = 0; j < arg.numValues; j++)
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{
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const blend_arg_t &arg1 = env.argStack[i + j];
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if (unlikely (!((arg1.blending () && (arg.numValues == arg1.numValues) && (arg1.valueIndex == j) &&
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(arg1.deltas.length == env.get_region_count ())))))
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{
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env.set_error ();
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return;
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}
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encoder.encode_num (arg1);
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}
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/* flatten deltas for each value */
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for (unsigned int j = 0; j < arg.numValues; j++)
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{
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const blend_arg_t &arg1 = env.argStack[i + j];
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for (unsigned int k = 0; k < arg1.deltas.length; k++)
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encoder.encode_num (arg1.deltas[k]);
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}
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/* flatten the number of values followed by blend operator */
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encoder.encode_int (arg.numValues);
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encoder.encode_op (OpCode_blendcs);
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}
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static void flush_op (op_code_t op, cff2_cs_interp_env_t &env, flatten_param_t& param)
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{
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switch (op)
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{
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case OpCode_return:
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case OpCode_endchar:
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return;
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default:
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str_encoder_t encoder (param.flatStr);
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encoder.encode_op (op);
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}
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}
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private:
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typedef cff2_cs_opset_t<cff2_cs_opset_flatten_t, flatten_param_t> SUPER;
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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;
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};
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struct cff2_cs_opset_subr_subset_t : cff2_cs_opset_t<cff2_cs_opset_subr_subset_t, subr_subset_param_t>
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{
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static void process_op (op_code_t op, cff2_cs_interp_env_t &env, subr_subset_param_t& param)
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{
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switch (op) {
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case OpCode_return:
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param.current_parsed_str->set_parsed ();
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env.return_from_subr ();
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param.set_current_str (env, false);
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break;
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case OpCode_endchar:
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param.current_parsed_str->set_parsed ();
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SUPER::process_op (op, env, param);
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break;
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case OpCode_callsubr:
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process_call_subr (op, CSType_LocalSubr, env, param, env.localSubrs, param.local_closure);
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break;
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case OpCode_callgsubr:
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process_call_subr (op, CSType_GlobalSubr, env, param, env.globalSubrs, param.global_closure);
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break;
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default:
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SUPER::process_op (op, env, param);
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param.current_parsed_str->add_op (op, env.str_ref);
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break;
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}
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}
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protected:
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static void process_call_subr (op_code_t op, cs_type_t type,
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cff2_cs_interp_env_t &env, subr_subset_param_t& param,
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cff2_biased_subrs_t& subrs, hb_set_t *closure)
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{
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byte_str_ref_t str_ref = env.str_ref;
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env.call_subr (subrs, type);
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param.current_parsed_str->add_call_op (op, str_ref, env.context.subr_num);
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hb_set_add (closure, env.context.subr_num);
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param.set_current_str (env, true);
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}
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private:
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typedef cff2_cs_opset_t<cff2_cs_opset_subr_subset_t, subr_subset_param_t> SUPER;
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};
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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>
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{
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cff2_subr_subsetter_t (const OT::cff2::accelerator_subset_t &acc, const hb_subset_plan_t *plan)
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: subr_subsetter_t (acc, plan) {}
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static void finalize_parsed_str (cff2_cs_interp_env_t &env, subr_subset_param_t& param, parsed_cs_str_t &charstring)
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{
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/* vsindex is inserted at the beginning of the charstring as necessary */
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if (env.seen_vsindex ())
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{
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number_t ivs;
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ivs.set_int ((int)env.get_ivs ());
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charstring.set_prefix (ivs, OpCode_vsindexcs);
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}
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}
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};
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struct cff2_subset_plan {
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cff2_subset_plan ()
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: final_size (0),
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orig_fdcount (0),
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subset_fdcount(1),
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subset_fdselect_format (0),
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drop_hints (false),
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desubroutinize (false)
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{
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subset_fdselect_ranges.init ();
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fdmap.init ();
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subset_charstrings.init ();
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subset_globalsubrs.init ();
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subset_localsubrs.init ();
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privateDictInfos.init ();
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}
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~cff2_subset_plan ()
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{
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subset_fdselect_ranges.fini ();
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fdmap.fini ();
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subset_charstrings.fini_deep ();
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subset_globalsubrs.fini_deep ();
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subset_localsubrs.fini_deep ();
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privateDictInfos.fini ();
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}
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bool create (const OT::cff2::accelerator_subset_t &acc,
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hb_subset_plan_t *plan)
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{
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final_size = 0;
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orig_fdcount = acc.fdArray->count;
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drop_hints = plan->drop_hints;
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desubroutinize = plan->desubroutinize;
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/* CFF2 header */
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final_size += OT::cff2::static_size;
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/* top dict */
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{
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cff2_top_dict_op_serializer_t topSzr;
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offsets.topDictInfo.size = TopDict::calculate_serialized_size (acc.topDict, topSzr);
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final_size += offsets.topDictInfo.size;
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}
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if (desubroutinize)
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{
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/* Flatten global & local subrs */
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subr_flattener_t<const OT::cff2::accelerator_subset_t, cff2_cs_interp_env_t, cff2_cs_opset_flatten_t>
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flattener(acc, plan);
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if (!flattener.flatten (subset_charstrings))
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return false;
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/* no global/local subroutines */
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offsets.globalSubrsInfo.size = CFF2Subrs::calculate_serialized_size (1, 0, 0);
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}
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else
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{
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cff2_subr_subsetter_t subr_subsetter (acc, plan);
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/* Subset subrs: collect used subroutines, leaving all unused ones behind */
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if (!subr_subsetter.subset ())
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return false;
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/* encode charstrings, global subrs, local subrs with new subroutine numbers */
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if (!subr_subsetter.encode_charstrings (subset_charstrings))
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return false;
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if (!subr_subsetter.encode_globalsubrs (subset_globalsubrs))
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return false;
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/* global subrs */
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unsigned int dataSize = subset_globalsubrs.total_size ();
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offsets.globalSubrsInfo.offSize = calcOffSize (dataSize);
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offsets.globalSubrsInfo.size = CFF2Subrs::calculate_serialized_size (offsets.globalSubrsInfo.offSize, subset_globalsubrs.length, dataSize);
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/* local subrs */
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if (!offsets.localSubrsInfos.resize (orig_fdcount))
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return false;
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if (!subset_localsubrs.resize (orig_fdcount))
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return false;
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for (unsigned int fd = 0; fd < orig_fdcount; fd++)
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{
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subset_localsubrs[fd].init ();
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offsets.localSubrsInfos[fd].init ();
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if (fdmap.includes (fd))
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{
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if (!subr_subsetter.encode_localsubrs (fd, subset_localsubrs[fd]))
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return false;
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unsigned int dataSize = subset_localsubrs[fd].total_size ();
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if (dataSize > 0)
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{
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offsets.localSubrsInfos[fd].offset = final_size;
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offsets.localSubrsInfos[fd].offSize = calcOffSize (dataSize);
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offsets.localSubrsInfos[fd].size = CFF2Subrs::calculate_serialized_size (offsets.localSubrsInfos[fd].offSize, subset_localsubrs[fd].length, dataSize);
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}
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}
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}
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}
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/* global subrs */
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offsets.globalSubrsInfo.offset = final_size;
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final_size += offsets.globalSubrsInfo.size;
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/* variation store */
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if (acc.varStore != &Null(CFF2VariationStore))
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{
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offsets.varStoreOffset = final_size;
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final_size += acc.varStore->get_size ();
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}
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/* FDSelect */
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if (acc.fdSelect != &Null(CFF2FDSelect))
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{
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offsets.FDSelectInfo.offset = final_size;
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if (unlikely (!hb_plan_subset_cff_fdselect (plan,
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orig_fdcount,
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*(const FDSelect *)acc.fdSelect,
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subset_fdcount,
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offsets.FDSelectInfo.size,
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subset_fdselect_format,
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subset_fdselect_ranges,
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fdmap)))
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return false;
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final_size += offsets.FDSelectInfo.size;
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}
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else
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fdmap.identity (1);
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/* FDArray (FDIndex) */
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{
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offsets.FDArrayInfo.offset = final_size;
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cff_font_dict_op_serializer_t fontSzr;
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unsigned int dictsSize = 0;
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for (unsigned int i = 0; i < acc.fontDicts.length; i++)
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if (fdmap.includes (i))
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dictsSize += FontDict::calculate_serialized_size (acc.fontDicts[i], fontSzr);
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offsets.FDArrayInfo.offSize = calcOffSize (dictsSize);
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final_size += CFF2Index::calculate_serialized_size (offsets.FDArrayInfo.offSize, subset_fdcount, dictsSize);
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}
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/* CharStrings */
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{
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offsets.charStringsInfo.offset = final_size;
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unsigned int dataSize = subset_charstrings.total_size ();
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offsets.charStringsInfo.offSize = calcOffSize (dataSize);
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final_size += CFF2CharStrings::calculate_serialized_size (offsets.charStringsInfo.offSize, plan->num_output_glyphs (), dataSize);
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}
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/* private dicts & local subrs */
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offsets.privateDictsOffset = final_size;
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for (unsigned int i = 0; i < orig_fdcount; i++)
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{
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if (fdmap.includes (i))
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{
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bool has_localsubrs = offsets.localSubrsInfos[i].size > 0;
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cff_private_dict_op_serializer_t privSzr (desubroutinize, drop_hints);
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unsigned int priv_size = PrivateDict::calculate_serialized_size (acc.privateDicts[i], privSzr, has_localsubrs);
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table_info_t privInfo = { final_size, priv_size, 0 };
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privateDictInfos.push (privInfo);
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final_size += privInfo.size;
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if (!plan->desubroutinize && has_localsubrs)
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{
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offsets.localSubrsInfos[i].offset = final_size;
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final_size += offsets.localSubrsInfos[i].size;
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}
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}
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}
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return true;
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}
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unsigned int get_final_size () const { return final_size; }
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unsigned int final_size;
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cff2_sub_table_offsets_t offsets;
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unsigned int orig_fdcount;
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unsigned int subset_fdcount;
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unsigned int subset_fdselect_format;
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hb_vector_t<code_pair_t> subset_fdselect_ranges;
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remap_t fdmap;
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str_buff_vec_t subset_charstrings;
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str_buff_vec_t subset_globalsubrs;
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hb_vector_t<str_buff_vec_t> subset_localsubrs;
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hb_vector_t<table_info_t> privateDictInfos;
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bool drop_hints;
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bool desubroutinize;
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};
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|
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static inline bool _write_cff2 (const cff2_subset_plan &plan,
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const OT::cff2::accelerator_subset_t &acc,
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unsigned int num_glyphs,
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unsigned int dest_sz,
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void *dest)
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{
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hb_serialize_context_t c (dest, dest_sz);
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OT::cff2 *cff2 = c.start_serialize<OT::cff2> ();
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if (unlikely (!c.extend_min (*cff2)))
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return false;
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|
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/* header */
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cff2->version.major = 0x02;
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cff2->version.minor = 0x00;
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cff2->topDict = OT::cff2::static_size;
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/* top dict */
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{
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assert (cff2->topDict == (unsigned) (c.head - c.start));
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cff2->topDictSize = plan.offsets.topDictInfo.size;
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TopDict &dict = cff2 + cff2->topDict;
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cff2_top_dict_op_serializer_t topSzr;
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if (unlikely (!dict.serialize (&c, acc.topDict, topSzr, plan.offsets)))
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{
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DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF2 top dict");
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return false;
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}
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}
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|
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/* global subrs */
|
|
{
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assert (cff2->topDict + plan.offsets.topDictInfo.size == (unsigned) (c.head - c.start));
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CFF2Subrs *dest = c.start_embed <CFF2Subrs> ();
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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;
|
|
}
|
|
}
|
|
|
|
/* variation store */
|
|
if (acc.varStore != &Null(CFF2VariationStore))
|
|
{
|
|
assert (plan.offsets.varStoreOffset == (unsigned) (c.head - c.start));
|
|
CFF2VariationStore *dest = c.start_embed<CFF2VariationStore> ();
|
|
if (unlikely (!dest->serialize (&c, acc.varStore)))
|
|
{
|
|
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF2 Variation Store");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* FDSelect */
|
|
if (acc.fdSelect != &Null(CFF2FDSelect))
|
|
{
|
|
assert (plan.offsets.FDSelectInfo.offset == (unsigned) (c.head - c.start));
|
|
|
|
if (unlikely (!hb_serialize_cff_fdselect (&c, num_glyphs, *(const FDSelect *)acc.fdSelect, acc.fdArray->count,
|
|
plan.subset_fdselect_format, plan.offsets.FDSelectInfo.size,
|
|
plan.subset_fdselect_ranges)))
|
|
{
|
|
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF2 subset FDSelect");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* FDArray (FD Index) */
|
|
{
|
|
assert (plan.offsets.FDArrayInfo.offset == (unsigned) (c.head - c.start));
|
|
CFF2FDArray *fda = c.start_embed<CFF2FDArray> ();
|
|
if (unlikely (fda == nullptr)) return false;
|
|
cff_font_dict_op_serializer_t fontSzr;
|
|
if (unlikely (!fda->serialize (&c, plan.offsets.FDArrayInfo.offSize,
|
|
acc.fontDicts, plan.subset_fdcount, plan.fdmap,
|
|
fontSzr, plan.privateDictInfos)))
|
|
{
|
|
DEBUG_MSG (SUBSET, nullptr, "failed to serialize CFF2 FDArray");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* CharStrings */
|
|
{
|
|
assert (plan.offsets.charStringsInfo.offset == (unsigned) (c.head - c.start));
|
|
CFF2CharStrings *cs = c.start_embed<CFF2CharStrings> ();
|
|
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 CFF2 CharStrings");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* private dicts & local subrs */
|
|
assert (plan.offsets.privateDictsOffset == (unsigned) (c.head - c.start));
|
|
for (unsigned int i = 0; i < acc.privateDicts.length; i++)
|
|
{
|
|
if (plan.fdmap.includes (i))
|
|
{
|
|
PrivateDict *pd = c.start_embed<PrivateDict> ();
|
|
if (unlikely (pd == nullptr)) return false;
|
|
unsigned int priv_size = plan.privateDictInfos[plan.fdmap[i]].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)
|
|
{
|
|
CFF2Subrs *dest = c.start_embed <CFF2Subrs> ();
|
|
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_cff2 (const OT::cff2::accelerator_subset_t &acc,
|
|
const char *data,
|
|
hb_subset_plan_t *plan,
|
|
hb_blob_t **prime /* OUT */)
|
|
{
|
|
cff2_subset_plan cff2_plan;
|
|
|
|
if (unlikely (!cff2_plan.create (acc, plan)))
|
|
{
|
|
DEBUG_MSG(SUBSET, nullptr, "Failed to generate a cff2 subsetting plan.");
|
|
return false;
|
|
}
|
|
|
|
unsigned int cff2_prime_size = cff2_plan.get_final_size ();
|
|
char *cff2_prime_data = (char *) calloc (1, cff2_prime_size);
|
|
|
|
if (unlikely (!_write_cff2 (cff2_plan, acc, plan->num_output_glyphs (),
|
|
cff2_prime_size, cff2_prime_data))) {
|
|
DEBUG_MSG(SUBSET, nullptr, "Failed to write a subset cff2.");
|
|
free (cff2_prime_data);
|
|
return false;
|
|
}
|
|
|
|
*prime = hb_blob_create (cff2_prime_data,
|
|
cff2_prime_size,
|
|
HB_MEMORY_MODE_READONLY,
|
|
cff2_prime_data,
|
|
free);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* hb_subset_cff2:
|
|
* Subsets the CFF2 table according to a provided plan.
|
|
*
|
|
* Return value: subsetted cff2 table.
|
|
**/
|
|
bool
|
|
hb_subset_cff2 (hb_subset_plan_t *plan,
|
|
hb_blob_t **prime /* OUT */)
|
|
{
|
|
hb_blob_t *cff2_blob = hb_sanitize_context_t().reference_table<CFF::cff2> (plan->source);
|
|
const char *data = hb_blob_get_data(cff2_blob, nullptr);
|
|
|
|
OT::cff2::accelerator_subset_t acc;
|
|
acc.init(plan->source);
|
|
bool result = likely (acc.is_valid ()) &&
|
|
_hb_subset_cff2 (acc, data, plan, prime);
|
|
|
|
hb_blob_destroy (cff2_blob);
|
|
acc.fini ();
|
|
|
|
return result;
|
|
}
|