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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
+ */
+
+#ifndef HB_SUBSET_CFF_COMMON_HH
+#define HB_SUBSET_CFF_COMMON_HH
+
+#include "hb.hh"
+
+#include "hb-subset-plan.hh"
+#include "hb-cff-interp-cs-common.hh"
+
+namespace CFF {
+
+/* Used for writing a temporary charstring */
+struct str_encoder_t
+{
+ str_encoder_t (str_buff_t &buff_)
+ : buff (buff_), error (false) {}
+
+ void reset () { buff.reset (); }
+
+ void encode_byte (unsigned char b)
+ {
+ buff.push (b);
+ if (unlikely (buff.in_error ()))
+ set_error ();
+ }
+
+ void encode_int (int v)
+ {
+ if ((-1131 <= v) && (v <= 1131))
+ {
+ if ((-107 <= v) && (v <= 107))
+ encode_byte (v + 139);
+ else if (v > 0)
+ {
+ v -= 108;
+ encode_byte ((v >> 8) + OpCode_TwoBytePosInt0);
+ encode_byte (v & 0xFF);
+ }
+ else
+ {
+ v = -v - 108;
+ encode_byte ((v >> 8) + OpCode_TwoByteNegInt0);
+ encode_byte (v & 0xFF);
+ }
+ }
+ else
+ {
+ if (unlikely (v < -32768))
+ v = -32768;
+ else if (unlikely (v > 32767))
+ v = 32767;
+ encode_byte (OpCode_shortint);
+ encode_byte ((v >> 8) & 0xFF);
+ encode_byte (v & 0xFF);
+ }
+ }
+
+ void encode_num (const number_t& n)
+ {
+ if (n.in_int_range ())
+ {
+ encode_int (n.to_int ());
+ }
+ else
+ {
+ int32_t v = n.to_fixed ();
+ encode_byte (OpCode_fixedcs);
+ encode_byte ((v >> 24) & 0xFF);
+ encode_byte ((v >> 16) & 0xFF);
+ encode_byte ((v >> 8) & 0xFF);
+ encode_byte (v & 0xFF);
+ }
+ }
+
+ void encode_op (op_code_t op)
+ {
+ if (Is_OpCode_ESC (op))
+ {
+ encode_byte (OpCode_escape);
+ encode_byte (Unmake_OpCode_ESC (op));
+ }
+ else
+ encode_byte (op);
+ }
+
+ void copy_str (const hb_ubytes_t &str)
+ {
+ unsigned int offset = buff.length;
+ /* Manually resize buffer since faster. */
+ if ((signed) (buff.length + str.length) <= buff.allocated)
+ buff.length += str.length;
+ else if (unlikely (!buff.resize (offset + str.length)))
+ {
+ set_error ();
+ return;
+ }
+ memcpy (buff.arrayZ + offset, &str[0], str.length);
+ }
+
+ bool is_error () const { return error; }
+
+ protected:
+ void set_error () { error = true; }
+
+ str_buff_t &buff;
+ bool error;
+};
+
+struct cff_sub_table_info_t {
+ cff_sub_table_info_t ()
+ : fd_array_link (0),
+ char_strings_link (0)
+ {
+ fd_select.init ();
+ }
+
+ table_info_t fd_select;
+ objidx_t fd_array_link;
+ objidx_t char_strings_link;
+};
+
+template <typename OPSTR=op_str_t>
+struct cff_top_dict_op_serializer_t : op_serializer_t
+{
+ bool serialize (hb_serialize_context_t *c,
+ const OPSTR &opstr,
+ const cff_sub_table_info_t &info) const
+ {
+ TRACE_SERIALIZE (this);
+
+ switch (opstr.op)
+ {
+ case OpCode_CharStrings:
+ return_trace (FontDict::serialize_link4_op(c, opstr.op, info.char_strings_link, whence_t::Absolute));
+
+ case OpCode_FDArray:
+ return_trace (FontDict::serialize_link4_op(c, opstr.op, info.fd_array_link, whence_t::Absolute));
+
+ case OpCode_FDSelect:
+ return_trace (FontDict::serialize_link4_op(c, opstr.op, info.fd_select.link, whence_t::Absolute));
+
+ default:
+ return_trace (copy_opstr (c, opstr));
+ }
+ return_trace (true);
+ }
+};
+
+struct cff_font_dict_op_serializer_t : op_serializer_t
+{
+ bool serialize (hb_serialize_context_t *c,
+ const op_str_t &opstr,
+ const table_info_t &privateDictInfo) const
+ {
+ TRACE_SERIALIZE (this);
+
+ if (opstr.op == OpCode_Private)
+ {
+ /* serialize the private dict size & offset as 2-byte & 4-byte integers */
+ return_trace (UnsizedByteStr::serialize_int2 (c, privateDictInfo.size) &&
+ Dict::serialize_link4_op (c, opstr.op, privateDictInfo.link, whence_t::Absolute));
+ }
+ else
+ {
+ HBUINT8 *d = c->allocate_size<HBUINT8> (opstr.str.length);
+ if (unlikely (!d)) return_trace (false);
+ memcpy (d, &opstr.str[0], opstr.str.length);
+ }
+ return_trace (true);
+ }
+};
+
+struct cff_private_dict_op_serializer_t : op_serializer_t
+{
+ cff_private_dict_op_serializer_t (bool desubroutinize_, bool drop_hints_)
+ : desubroutinize (desubroutinize_), drop_hints (drop_hints_) {}
+
+ 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 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));
+ }
+ else
+ return_trace (copy_opstr (c, opstr));
+ }
+
+ protected:
+ const bool desubroutinize;
+ const bool drop_hints;
+};
+
+struct flatten_param_t
+{
+ str_buff_t &flatStr;
+ bool drop_hints;
+};
+
+template <typename ACC, typename ENV, typename OPSET, op_code_t endchar_op=OpCode_Invalid>
+struct subr_flattener_t
+{
+ subr_flattener_t (const ACC &acc_,
+ const hb_subset_plan_t *plan_)
+ : acc (acc_), plan (plan_) {}
+
+ bool flatten (str_buff_vec_t &flat_charstrings)
+ {
+ if (!flat_charstrings.resize (plan->num_output_glyphs ()))
+ return false;
+ for (unsigned int i = 0; i < plan->num_output_glyphs (); i++)
+ flat_charstrings[i].init ();
+ for (unsigned int i = 0; i < plan->num_output_glyphs (); i++)
+ {
+ hb_codepoint_t glyph;
+ if (!plan->old_gid_for_new_gid (i, &glyph))
+ {
+ /* add an endchar only charstring for a missing glyph if CFF1 */
+ if (endchar_op != OpCode_Invalid) flat_charstrings[i].push (endchar_op);
+ continue;
+ }
+ const hb_ubytes_t str = (*acc.charStrings)[glyph];
+ unsigned int fd = acc.fdSelect->get_fd (glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+ ENV env (str, acc, fd);
+ cs_interpreter_t<ENV, OPSET, flatten_param_t> interp (env);
+ flatten_param_t param = {
+ flat_charstrings[i],
+ (bool) (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
+ };
+ if (unlikely (!interp.interpret (param)))
+ return false;
+ }
+ return true;
+ }
+
+ const ACC &acc;
+ const hb_subset_plan_t *plan;
+};
+
+struct subr_closures_t
+{
+ subr_closures_t (unsigned int fd_count) : valid (false), global_closure (), local_closures ()
+ {
+ valid = true;
+ if (!local_closures.resize (fd_count))
+ valid = false;
+ }
+
+ void reset ()
+ {
+ global_closure.clear();
+ for (unsigned int i = 0; i < local_closures.length; i++)
+ local_closures[i].clear();
+ }
+
+ bool is_valid () const { return valid; }
+ bool valid;
+ hb_set_t global_closure;
+ hb_vector_t<hb_set_t> local_closures;
+};
+
+struct parsed_cs_op_t : op_str_t
+{
+ void init (unsigned int subr_num_ = 0)
+ {
+ subr_num = subr_num_;
+ drop_flag = false;
+ keep_flag = false;
+ skip_flag = false;
+ }
+
+ bool for_drop () const { return drop_flag; }
+ void set_drop () { if (!for_keep ()) drop_flag = true; }
+
+ bool for_keep () const { return keep_flag; }
+ void set_keep () { keep_flag = true; }
+
+ bool for_skip () const { return skip_flag; }
+ void set_skip () { skip_flag = true; }
+
+ unsigned int subr_num;
+
+ protected:
+ bool drop_flag;
+ bool keep_flag;
+ bool skip_flag;
+};
+
+struct parsed_cs_str_t : parsed_values_t<parsed_cs_op_t>
+{
+ void init ()
+ {
+ SUPER::init ();
+ parsed = false;
+ hint_dropped = false;
+ has_prefix_ = false;
+ }
+
+ void add_op (op_code_t op, const byte_str_ref_t& str_ref)
+ {
+ if (!is_parsed ())
+ SUPER::add_op (op, str_ref);
+ }
+
+ void add_call_op (op_code_t op, const byte_str_ref_t& str_ref, unsigned int subr_num)
+ {
+ if (!is_parsed ())
+ {
+ unsigned int parsed_len = get_count ();
+ if (likely (parsed_len > 0))
+ values[parsed_len-1].set_skip ();
+
+ parsed_cs_op_t val;
+ val.init (subr_num);
+ SUPER::add_op (op, str_ref, val);
+ }
+ }
+
+ void set_prefix (const number_t &num, op_code_t op = OpCode_Invalid)
+ {
+ has_prefix_ = true;
+ prefix_op_ = op;
+ prefix_num_ = num;
+ }
+
+ bool at_end (unsigned int pos) const
+ {
+ return ((pos + 1 >= values.length) /* CFF2 */
+ || (values[pos + 1].op == OpCode_return));
+ }
+
+ bool is_parsed () const { return parsed; }
+ void set_parsed () { parsed = true; }
+
+ bool is_hint_dropped () const { return hint_dropped; }
+ void set_hint_dropped () { hint_dropped = true; }
+
+ bool is_vsindex_dropped () const { return vsindex_dropped; }
+ void set_vsindex_dropped () { vsindex_dropped = true; }
+
+ bool has_prefix () const { return has_prefix_; }
+ op_code_t prefix_op () const { return prefix_op_; }
+ const number_t &prefix_num () const { return prefix_num_; }
+
+ protected:
+ bool parsed;
+ bool hint_dropped;
+ bool vsindex_dropped;
+ bool has_prefix_;
+ op_code_t prefix_op_;
+ number_t prefix_num_;
+
+ private:
+ typedef parsed_values_t<parsed_cs_op_t> SUPER;
+};
+
+struct parsed_cs_str_vec_t : hb_vector_t<parsed_cs_str_t>
+{
+ private:
+ typedef hb_vector_t<parsed_cs_str_t> SUPER;
+};
+
+struct subr_subset_param_t
+{
+ subr_subset_param_t (parsed_cs_str_t *parsed_charstring_,
+ parsed_cs_str_vec_t *parsed_global_subrs_,
+ parsed_cs_str_vec_t *parsed_local_subrs_,
+ hb_set_t *global_closure_,
+ hb_set_t *local_closure_,
+ bool drop_hints_) :
+ current_parsed_str (parsed_charstring_),
+ parsed_charstring (parsed_charstring_),
+ parsed_global_subrs (parsed_global_subrs_),
+ parsed_local_subrs (parsed_local_subrs_),
+ global_closure (global_closure_),
+ local_closure (local_closure_),
+ drop_hints (drop_hints_) {}
+
+ parsed_cs_str_t *get_parsed_str_for_context (call_context_t &context)
+ {
+ switch (context.type)
+ {
+ case CSType_CharString:
+ return parsed_charstring;
+
+ case CSType_LocalSubr:
+ if (likely (context.subr_num < parsed_local_subrs->length))
+ return &(*parsed_local_subrs)[context.subr_num];
+ break;
+
+ case CSType_GlobalSubr:
+ if (likely (context.subr_num < parsed_global_subrs->length))
+ return &(*parsed_global_subrs)[context.subr_num];
+ break;
+ }
+ return nullptr;
+ }
+
+ template <typename ENV>
+ void set_current_str (ENV &env, bool calling)
+ {
+ parsed_cs_str_t *parsed_str = get_parsed_str_for_context (env.context);
+ if (unlikely (!parsed_str))
+ {
+ env.set_error ();
+ return;
+ }
+ /* If the called subroutine is parsed partially but not completely yet,
+ * it must be because we are calling it recursively.
+ * Handle it as an error. */
+ if (unlikely (calling && !parsed_str->is_parsed () && (parsed_str->values.length > 0)))
+ env.set_error ();
+ else
+ current_parsed_str = parsed_str;
+ }
+
+ parsed_cs_str_t *current_parsed_str;
+
+ parsed_cs_str_t *parsed_charstring;
+ parsed_cs_str_vec_t *parsed_global_subrs;
+ parsed_cs_str_vec_t *parsed_local_subrs;
+ hb_set_t *global_closure;
+ hb_set_t *local_closure;
+ bool drop_hints;
+};
+
+struct subr_remap_t : hb_inc_bimap_t
+{
+ void create (const hb_set_t *closure)
+ {
+ /* create a remapping of subroutine numbers from old to new.
+ * no optimization based on usage counts. fonttools doesn't appear doing that either.
+ */
+
+ resize (closure->get_population ());
+ hb_codepoint_t old_num = HB_SET_VALUE_INVALID;
+ while (hb_set_next (closure, &old_num))
+ add (old_num);
+
+ if (get_population () < 1240)
+ bias = 107;
+ else if (get_population () < 33900)
+ bias = 1131;
+ else
+ bias = 32768;
+ }
+
+ int biased_num (unsigned int old_num) const
+ {
+ hb_codepoint_t new_num = get (old_num);
+ return (int)new_num - bias;
+ }
+
+ protected:
+ int bias;
+};
+
+struct subr_remaps_t
+{
+ subr_remaps_t (unsigned int fdCount)
+ {
+ local_remaps.resize (fdCount);
+ }
+
+ bool in_error()
+ {
+ return local_remaps.in_error ();
+ }
+
+ void create (subr_closures_t& closures)
+ {
+ global_remap.create (&closures.global_closure);
+ for (unsigned int i = 0; i < local_remaps.length; i++)
+ local_remaps[i].create (&closures.local_closures[i]);
+ }
+
+ subr_remap_t global_remap;
+ hb_vector_t<subr_remap_t> local_remaps;
+};
+
+template <typename SUBSETTER, typename SUBRS, typename ACC, typename ENV, typename OPSET, op_code_t endchar_op=OpCode_Invalid>
+struct subr_subsetter_t
+{
+ subr_subsetter_t (ACC &acc_, const hb_subset_plan_t *plan_)
+ : acc (acc_), plan (plan_), closures(acc_.fdCount), remaps(acc_.fdCount)
+ {}
+
+ /* Subroutine subsetting with --no-desubroutinize runs in phases:
+ *
+ * 1. execute charstrings/subroutines to determine subroutine closures
+ * 2. parse out all operators and numbers
+ * 3. mark hint operators and operands for removal if --no-hinting
+ * 4. re-encode all charstrings and subroutines with new subroutine numbers
+ *
+ * Phases #1 and #2 are done at the same time in collect_subrs ().
+ * Phase #3 walks charstrings/subroutines forward then backward (hence parsing required),
+ * because we can't tell if a number belongs to a hint op until we see the first moveto.
+ *
+ * Assumption: a callsubr/callgsubr operator must immediately follow a (biased) subroutine number
+ * within the same charstring/subroutine, e.g., not split across a charstring and a subroutine.
+ */
+ bool subset (void)
+ {
+ parsed_charstrings.resize (plan->num_output_glyphs ());
+ parsed_global_subrs.resize (acc.globalSubrs->count);
+
+ if (unlikely (remaps.in_error()
+ || parsed_charstrings.in_error ()
+ || parsed_global_subrs.in_error ())) {
+ return false;
+ }
+
+ if (unlikely (!parsed_local_subrs.resize (acc.fdCount))) return false;
+
+ for (unsigned int i = 0; i < acc.fdCount; i++)
+ {
+ parsed_local_subrs[i].resize (acc.privateDicts[i].localSubrs->count);
+ if (unlikely (parsed_local_subrs[i].in_error ())) return false;
+ }
+ if (unlikely (!closures.valid))
+ return false;
+
+ /* phase 1 & 2 */
+ for (unsigned int i = 0; i < plan->num_output_glyphs (); i++)
+ {
+ hb_codepoint_t glyph;
+ if (!plan->old_gid_for_new_gid (i, &glyph))
+ continue;
+ const hb_ubytes_t str = (*acc.charStrings)[glyph];
+ unsigned int fd = acc.fdSelect->get_fd (glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+
+ ENV env (str, acc, fd);
+ cs_interpreter_t<ENV, OPSET, subr_subset_param_t> interp (env);
+
+ parsed_charstrings[i].alloc (str.length);
+ subr_subset_param_t param (&parsed_charstrings[i],
+ &parsed_global_subrs,
+ &parsed_local_subrs[fd],
+ &closures.global_closure,
+ &closures.local_closures[fd],
+ plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
+
+ if (unlikely (!interp.interpret (param)))
+ return false;
+
+ /* complete parsed string esp. copy CFF1 width or CFF2 vsindex to the parsed charstring for encoding */
+ SUBSETTER::complete_parsed_str (interp.env, param, parsed_charstrings[i]);
+ }
+
+ if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
+ {
+ /* mark hint ops and arguments for drop */
+ for (unsigned int i = 0; i < plan->num_output_glyphs (); i++)
+ {
+ hb_codepoint_t glyph;
+ if (!plan->old_gid_for_new_gid (i, &glyph))
+ continue;
+ unsigned int fd = acc.fdSelect->get_fd (glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+ subr_subset_param_t param (&parsed_charstrings[i],
+ &parsed_global_subrs,
+ &parsed_local_subrs[fd],
+ &closures.global_closure,
+ &closures.local_closures[fd],
+ plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
+
+ drop_hints_param_t drop;
+ if (drop_hints_in_str (parsed_charstrings[i], param, drop))
+ {
+ parsed_charstrings[i].set_hint_dropped ();
+ if (drop.vsindex_dropped)
+ parsed_charstrings[i].set_vsindex_dropped ();
+ }
+ }
+
+ /* after dropping hints recreate closures of actually used subrs */
+ closures.reset ();
+ for (unsigned int i = 0; i < plan->num_output_glyphs (); i++)
+ {
+ hb_codepoint_t glyph;
+ if (!plan->old_gid_for_new_gid (i, &glyph))
+ continue;
+ unsigned int fd = acc.fdSelect->get_fd (glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+ subr_subset_param_t param (&parsed_charstrings[i],
+ &parsed_global_subrs,
+ &parsed_local_subrs[fd],
+ &closures.global_closure,
+ &closures.local_closures[fd],
+ plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
+ collect_subr_refs_in_str (parsed_charstrings[i], param);
+ }
+ }
+
+ remaps.create (closures);
+
+ return true;
+ }
+
+ bool encode_charstrings (str_buff_vec_t &buffArray) const
+ {
+ if (unlikely (!buffArray.resize (plan->num_output_glyphs ())))
+ return false;
+ for (unsigned int i = 0; i < plan->num_output_glyphs (); i++)
+ {
+ hb_codepoint_t glyph;
+ if (!plan->old_gid_for_new_gid (i, &glyph))
+ {
+ /* add an endchar only charstring for a missing glyph if CFF1 */
+ if (endchar_op != OpCode_Invalid) buffArray[i].push (endchar_op);
+ continue;
+ }
+ unsigned int fd = acc.fdSelect->get_fd (glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+ if (unlikely (!encode_str (parsed_charstrings[i], fd, buffArray[i])))
+ return false;
+ }
+ return true;
+ }
+
+ bool encode_subrs (const parsed_cs_str_vec_t &subrs, const subr_remap_t& remap, unsigned int fd, str_buff_vec_t &buffArray) const
+ {
+ unsigned int count = remap.get_population ();
+
+ if (unlikely (!buffArray.resize (count)))
+ return false;
+ for (unsigned int old_num = 0; old_num < subrs.length; old_num++)
+ {
+ hb_codepoint_t new_num = remap[old_num];
+ if (new_num != CFF_UNDEF_CODE)
+ {
+ if (unlikely (!encode_str (subrs[old_num], fd, buffArray[new_num])))
+ return false;
+ }
+ }
+ return true;
+ }
+
+ bool encode_globalsubrs (str_buff_vec_t &buffArray)
+ {
+ return encode_subrs (parsed_global_subrs, remaps.global_remap, 0, buffArray);
+ }
+
+ bool encode_localsubrs (unsigned int fd, str_buff_vec_t &buffArray) const
+ {
+ return encode_subrs (parsed_local_subrs[fd], remaps.local_remaps[fd], fd, buffArray);
+ }
+
+ protected:
+ struct drop_hints_param_t
+ {
+ drop_hints_param_t ()
+ : seen_moveto (false),
+ ends_in_hint (false),
+ all_dropped (false),
+ vsindex_dropped (false) {}
+
+ bool seen_moveto;
+ bool ends_in_hint;
+ bool all_dropped;
+ bool vsindex_dropped;
+ };
+
+ bool drop_hints_in_subr (parsed_cs_str_t &str, unsigned int pos,
+ parsed_cs_str_vec_t &subrs, unsigned int subr_num,
+ const subr_subset_param_t &param, drop_hints_param_t &drop)
+ {
+ drop.ends_in_hint = false;
+ bool has_hint = drop_hints_in_str (subrs[subr_num], param, drop);
+
+ /* if this subr ends with a stem hint (i.e., not a number; potential argument for moveto),
+ * then this entire subroutine must be a hint. drop its call. */
+ if (drop.ends_in_hint)
+ {
+ str.values[pos].set_drop ();
+ /* if this subr call is at the end of the parent subr, propagate the flag
+ * otherwise reset the flag */
+ if (!str.at_end (pos))
+ drop.ends_in_hint = false;
+ }
+ else if (drop.all_dropped)
+ {
+ str.values[pos].set_drop ();
+ }
+
+ return has_hint;
+ }
+
+ /* returns true if it sees a hint op before the first moveto */
+ bool drop_hints_in_str (parsed_cs_str_t &str, const subr_subset_param_t &param, drop_hints_param_t &drop)
+ {
+ bool seen_hint = false;
+
+ for (unsigned int pos = 0; pos < str.values.length; pos++)
+ {
+ bool has_hint = false;
+ switch (str.values[pos].op)
+ {
+ case OpCode_callsubr:
+ has_hint = drop_hints_in_subr (str, pos,
+ *param.parsed_local_subrs, str.values[pos].subr_num,
+ param, drop);
+ break;
+
+ case OpCode_callgsubr:
+ has_hint = drop_hints_in_subr (str, pos,
+ *param.parsed_global_subrs, str.values[pos].subr_num,
+ param, drop);
+ break;
+
+ case OpCode_rmoveto:
+ case OpCode_hmoveto:
+ case OpCode_vmoveto:
+ drop.seen_moveto = true;
+ break;
+
+ case OpCode_hintmask:
+ case OpCode_cntrmask:
+ if (drop.seen_moveto)
+ {
+ str.values[pos].set_drop ();
+ break;
+ }
+ HB_FALLTHROUGH;
+
+ case OpCode_hstemhm:
+ case OpCode_vstemhm:
+ case OpCode_hstem:
+ case OpCode_vstem:
+ has_hint = true;
+ str.values[pos].set_drop ();
+ if (str.at_end (pos))
+ drop.ends_in_hint = true;
+ break;
+
+ case OpCode_dotsection:
+ str.values[pos].set_drop ();
+ break;
+
+ default:
+ /* NONE */
+ break;
+ }
+ if (has_hint)
+ {
+ for (int i = pos - 1; i >= 0; i--)
+ {
+ parsed_cs_op_t &csop = str.values[(unsigned)i];
+ if (csop.for_drop ())
+ break;
+ csop.set_drop ();
+ if (csop.op == OpCode_vsindexcs)
+ drop.vsindex_dropped = true;
+ }
+ seen_hint |= has_hint;
+ }
+ }
+
+ /* Raise all_dropped flag if all operators except return are dropped from a subr.
+ * It may happen even after seeing the first moveto if a subr contains
+ * only (usually one) hintmask operator, then calls to this subr can be dropped.
+ */
+ drop.all_dropped = true;
+ for (unsigned int pos = 0; pos < str.values.length; pos++)
+ {
+ parsed_cs_op_t &csop = str.values[pos];
+ if (csop.op == OpCode_return)
+ break;
+ if (!csop.for_drop ())
+ {
+ drop.all_dropped = false;
+ break;
+ }
+ }
+
+ return seen_hint;
+ }
+
+ void collect_subr_refs_in_subr (parsed_cs_str_t &str, unsigned int pos,
+ unsigned int subr_num, parsed_cs_str_vec_t &subrs,
+ hb_set_t *closure,
+ const subr_subset_param_t &param)
+ {
+ closure->add (subr_num);
+ collect_subr_refs_in_str (subrs[subr_num], param);
+ }
+
+ void collect_subr_refs_in_str (parsed_cs_str_t &str, const subr_subset_param_t &param)
+ {
+ for (unsigned int pos = 0; pos < str.values.length; pos++)
+ {
+ if (!str.values[pos].for_drop ())
+ {
+ switch (str.values[pos].op)
+ {
+ case OpCode_callsubr:
+ collect_subr_refs_in_subr (str, pos,
+ str.values[pos].subr_num, *param.parsed_local_subrs,
+ param.local_closure, param);
+ break;
+
+ case OpCode_callgsubr:
+ collect_subr_refs_in_subr (str, pos,
+ str.values[pos].subr_num, *param.parsed_global_subrs,
+ param.global_closure, param);
+ break;
+
+ default: break;
+ }
+ }
+ }
+ }
+
+ bool encode_str (const parsed_cs_str_t &str, const unsigned int fd, str_buff_t &buff) const
+ {
+ unsigned count = str.get_count ();
+ str_encoder_t encoder (buff);
+ encoder.reset ();
+ buff.alloc (count * 3);
+ /* if a prefix (CFF1 width or CFF2 vsindex) has been removed along with hints,
+ * re-insert it at the beginning of charstreing */
+ if (str.has_prefix () && str.is_hint_dropped ())
+ {
+ encoder.encode_num (str.prefix_num ());
+ if (str.prefix_op () != OpCode_Invalid)
+ encoder.encode_op (str.prefix_op ());
+ }
+ for (unsigned int i = 0; i < count; i++)
+ {
+ const parsed_cs_op_t &opstr = str.values[i];
+ if (!opstr.for_drop () && !opstr.for_skip ())
+ {
+ switch (opstr.op)
+ {
+ case OpCode_callsubr:
+ encoder.encode_int (remaps.local_remaps[fd].biased_num (opstr.subr_num));
+ encoder.encode_op (OpCode_callsubr);
+ break;
+
+ case OpCode_callgsubr:
+ encoder.encode_int (remaps.global_remap.biased_num (opstr.subr_num));
+ encoder.encode_op (OpCode_callgsubr);
+ break;
+
+ default:
+ encoder.copy_str (opstr.str);
+ break;
+ }
+ }
+ }
+ return !encoder.is_error ();
+ }
+
+ protected:
+ const ACC &acc;
+ const hb_subset_plan_t *plan;
+
+ subr_closures_t closures;
+
+ parsed_cs_str_vec_t parsed_charstrings;
+ parsed_cs_str_vec_t parsed_global_subrs;
+ hb_vector_t<parsed_cs_str_vec_t> parsed_local_subrs;
+
+ subr_remaps_t remaps;
+
+ private:
+ typedef typename SUBRS::count_type subr_count_type;
+};
+
+} /* namespace CFF */
+
+HB_INTERNAL bool
+hb_plan_subset_cff_fdselect (const hb_subset_plan_t *plan,
+ unsigned int fdCount,
+ const CFF::FDSelect &src, /* IN */
+ unsigned int &subset_fd_count /* OUT */,
+ unsigned int &subset_fdselect_size /* OUT */,
+ unsigned int &subset_fdselect_format /* OUT */,
+ hb_vector_t<CFF::code_pair_t> &fdselect_ranges /* OUT */,
+ hb_inc_bimap_t &fdmap /* OUT */);
+
+HB_INTERNAL bool
+hb_serialize_cff_fdselect (hb_serialize_context_t *c,
+ unsigned int num_glyphs,
+ const CFF::FDSelect &src,
+ unsigned int fd_count,
+ unsigned int fdselect_format,
+ unsigned int size,
+ const hb_vector_t<CFF::code_pair_t> &fdselect_ranges);
+
+#endif /* HB_SUBSET_CFF_COMMON_HH */
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-24 05:53:01 +0000