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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_) {}
+
+ void reset () { buff.reset (); }
+
+ void encode_byte (unsigned char b)
+ {
+ if (likely ((signed) buff.length < buff.allocated))
+ buff.arrayZ[buff.length++] = b;
+ else
+ buff.push (b);
+ }
+
+ 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);
+ }
+ }
+
+ // Encode number for CharString
+ void encode_num_cs (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);
+ }
+ }
+
+ // Encode number for TopDict / Private
+ void encode_num_tp (const number_t& n)
+ {
+ if (n.in_int_range ())
+ {
+ // TODO longint
+ encode_int (n.to_int ());
+ }
+ else
+ {
+ // Sigh. BCD
+ // https://learn.microsoft.com/en-us/typography/opentype/spec/cff2#table-5-nibble-definitions
+ double v = n.to_real ();
+ encode_byte (OpCode_BCD);
+
+ // Based on:
+ // https://github.com/fonttools/fonttools/blob/97ed3a61cde03e17b8be36f866192fbd56f1d1a7/Lib/fontTools/misc/psCharStrings.py#L265-L294
+
+ char buf[16];
+ /* FontTools has the following comment:
+ *
+ * # Note: 14 decimal digits seems to be the limitation for CFF real numbers
+ * # in macOS. However, we use 8 here to match the implementation of AFDKO.
+ *
+ * We use 8 here to match FontTools X-).
+ */
+
+ hb_locale_t clocale HB_UNUSED;
+ hb_locale_t oldlocale HB_UNUSED;
+ oldlocale = hb_uselocale (clocale = newlocale (LC_ALL_MASK, "C", NULL));
+ snprintf (buf, sizeof (buf), "%.8G", v);
+ (void) hb_uselocale (((void) freelocale (clocale), oldlocale));
+
+ char *s = buf;
+ if (s[0] == '0' && s[1] == '.')
+ s++;
+ else if (s[0] == '-' && s[1] == '0' && s[2] == '.')
+ {
+ s[1] = '-';
+ s++;
+ }
+ hb_vector_t<char> nibbles;
+ while (*s)
+ {
+ char c = s[0];
+ s++;
+
+ switch (c)
+ {
+ case 'E':
+ {
+ char c2 = *s;
+ if (c2 == '-')
+ {
+ s++;
+ nibbles.push (0x0C); // E-
+ continue;
+ }
+ if (c2 == '+')
+ s++;
+ nibbles.push (0x0B); // E
+ continue;
+ }
+
+ case '.': case ',': // Comma for some European locales in case no uselocale available.
+ nibbles.push (0x0A); // .
+ continue;
+
+ case '-':
+ nibbles.push (0x0E); // .
+ continue;
+ }
+
+ nibbles.push (c - '0');
+ }
+ nibbles.push (0x0F);
+ if (nibbles.length % 2)
+ nibbles.push (0x0F);
+
+ unsigned count = nibbles.length;
+ for (unsigned i = 0; i < count; i += 2)
+ encode_byte ((nibbles[i] << 4) | nibbles[i+1]);
+ }
+ }
+
+ 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 unsigned char *str, unsigned length)
+ {
+ assert ((signed) (buff.length + length) <= buff.allocated);
+ hb_memcpy (buff.arrayZ + buff.length, str, length);
+ buff.length += length;
+ }
+
+ bool in_error () const { return buff.in_error (); }
+
+ protected:
+
+ str_buff_t &buff;
+};
+
+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
+ {
+ unsigned char *d = c->allocate_size<unsigned char> (opstr.length);
+ if (unlikely (!d)) return_trace (false);
+ /* Faster than hb_memcpy for small strings. */
+ for (unsigned i = 0; i < opstr.length; i++)
+ d[i] = opstr.ptr[i];
+ //hb_memcpy (d, opstr.ptr, opstr.length);
+ }
+ return_trace (true);
+ }
+};
+
+struct flatten_param_t
+{
+ str_buff_t &flatStr;
+ bool drop_hints;
+ const hb_subset_plan_t *plan;
+};
+
+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)
+ {
+ unsigned count = plan->num_output_glyphs ();
+ if (!flat_charstrings.resize_exact (count))
+ return false;
+ for (unsigned int i = 0; i < count; 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,
+ plan->normalized_coords.arrayZ, plan->normalized_coords.length);
+ cs_interpreter_t<ENV, OPSET, flatten_param_t> interp (env);
+ flatten_param_t param = {
+ flat_charstrings.arrayZ[i],
+ (bool) (plan->flags & HB_SUBSET_FLAGS_NO_HINTING),
+ plan
+ };
+ 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) : global_closure (), local_closures ()
+ {
+ local_closures.resize_exact (fd_count);
+ }
+
+ void reset ()
+ {
+ global_closure.clear();
+ for (unsigned int i = 0; i < local_closures.length; i++)
+ local_closures[i].clear();
+ }
+
+ bool in_error () const { return local_closures.in_error (); }
+ hb_set_t global_closure;
+ hb_vector_t<hb_set_t> local_closures;
+};
+
+struct parsed_cs_op_t : op_str_t
+{
+ parsed_cs_op_t (unsigned int subr_num_ = 0) :
+ subr_num (subr_num_) {}
+
+ bool is_hinting () const { return hinting_flag; }
+ void set_hinting () { hinting_flag = true; }
+
+ /* The layout of this struct is designed to fit within the
+ * padding of op_str_t! */
+
+ protected:
+ bool hinting_flag = false;
+
+ public:
+ uint16_t subr_num;
+};
+
+struct parsed_cs_str_t : parsed_values_t<parsed_cs_op_t>
+{
+ parsed_cs_str_t () :
+ parsed (false),
+ hint_dropped (false),
+ has_prefix_ (false),
+ has_calls_ (false)
+ {
+ SUPER::init ();
+ }
+
+ 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 ())
+ {
+ has_calls_ = true;
+
+ /* Pop the subroutine number. */
+ values.pop ();
+
+ SUPER::add_op (op, str_ref, {subr_num});
+ }
+ }
+
+ 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_; }
+
+ bool has_calls () const { return has_calls_; }
+
+ void compact ()
+ {
+ unsigned count = values.length;
+ if (!count) return;
+ auto &opstr = values.arrayZ;
+ unsigned j = 0;
+ for (unsigned i = 1; i < count; i++)
+ {
+ /* See if we can combine op j and op i. */
+ bool combine =
+ (opstr[j].op != OpCode_callsubr && opstr[j].op != OpCode_callgsubr) &&
+ (opstr[i].op != OpCode_callsubr && opstr[i].op != OpCode_callgsubr) &&
+ (opstr[j].is_hinting () == opstr[i].is_hinting ()) &&
+ (opstr[j].ptr + opstr[j].length == opstr[i].ptr) &&
+ (opstr[j].length + opstr[i].length <= 255);
+
+ if (combine)
+ {
+ opstr[j].length += opstr[i].length;
+ opstr[j].op = OpCode_Invalid;
+ }
+ else
+ {
+ opstr[++j] = opstr[i];
+ }
+ }
+ values.shrink (j + 1);
+ }
+
+ protected:
+ bool parsed : 1;
+ bool hint_dropped : 1;
+ bool vsindex_dropped : 1;
+ bool has_prefix_ : 1;
+ bool has_calls_ : 1;
+ 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 cff_subset_accelerator_t
+{
+ static cff_subset_accelerator_t* create (
+ hb_blob_t* original_blob,
+ const parsed_cs_str_vec_t& parsed_charstrings,
+ const parsed_cs_str_vec_t& parsed_global_subrs,
+ const hb_vector_t<parsed_cs_str_vec_t>& parsed_local_subrs) {
+ cff_subset_accelerator_t* accel =
+ (cff_subset_accelerator_t*) hb_malloc (sizeof(cff_subset_accelerator_t));
+ if (unlikely (!accel)) return nullptr;
+ new (accel) cff_subset_accelerator_t (original_blob,
+ parsed_charstrings,
+ parsed_global_subrs,
+ parsed_local_subrs);
+ return accel;
+ }
+
+ static void destroy (void* value) {
+ if (!value) return;
+
+ cff_subset_accelerator_t* accel = (cff_subset_accelerator_t*) value;
+ accel->~cff_subset_accelerator_t ();
+ hb_free (accel);
+ }
+
+ cff_subset_accelerator_t(
+ hb_blob_t* original_blob_,
+ const parsed_cs_str_vec_t& parsed_charstrings_,
+ const parsed_cs_str_vec_t& parsed_global_subrs_,
+ const hb_vector_t<parsed_cs_str_vec_t>& parsed_local_subrs_)
+ {
+ parsed_charstrings = parsed_charstrings_;
+ parsed_global_subrs = parsed_global_subrs_;
+ parsed_local_subrs = parsed_local_subrs_;
+
+ // the parsed charstrings point to memory in the original CFF table so we must hold a reference
+ // to it to keep the memory valid.
+ original_blob = hb_blob_reference (original_blob_);
+ }
+
+ ~cff_subset_accelerator_t()
+ {
+ hb_blob_destroy (original_blob);
+ auto *mapping = glyph_to_sid_map.get_relaxed ();
+ if (mapping)
+ {
+ mapping->~glyph_to_sid_map_t ();
+ hb_free (mapping);
+ }
+ }
+
+ 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;
+ mutable hb_atomic_ptr_t<glyph_to_sid_map_t> glyph_to_sid_map;
+
+ private:
+ hb_blob_t* original_blob;
+};
+
+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
+ {
+ if (!parsed_str->is_parsed ())
+ parsed_str->alloc (env.str_ref.total_size ());
+ 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.
+ */
+
+ alloc (closure->get_population ());
+ for (auto old_num : *closure)
+ 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.arrayZ[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)
+ {
+ unsigned fd_count = acc.fdCount;
+ const cff_subset_accelerator_t* cff_accelerator = nullptr;
+ if (acc.cff_accelerator) {
+ cff_accelerator = acc.cff_accelerator;
+ fd_count = cff_accelerator->parsed_local_subrs.length;
+ }
+
+ if (cff_accelerator) {
+ // If we are not dropping hinting then charstrings are not modified so we can
+ // just use a reference to the cached copies.
+ cached_charstrings.resize_exact (plan->num_output_glyphs ());
+ parsed_global_subrs = &cff_accelerator->parsed_global_subrs;
+ parsed_local_subrs = &cff_accelerator->parsed_local_subrs;
+ } else {
+ parsed_charstrings.resize_exact (plan->num_output_glyphs ());
+ parsed_global_subrs_storage.resize_exact (acc.globalSubrs->count);
+
+ if (unlikely (!parsed_local_subrs_storage.resize (fd_count))) return false;
+
+ for (unsigned int i = 0; i < acc.fdCount; i++)
+ {
+ unsigned count = acc.privateDicts[i].localSubrs->count;
+ parsed_local_subrs_storage[i].resize (count);
+ if (unlikely (parsed_local_subrs_storage[i].in_error ())) return false;
+ }
+
+ parsed_global_subrs = &parsed_global_subrs_storage;
+ parsed_local_subrs = &parsed_local_subrs_storage;
+ }
+
+ if (unlikely (remaps.in_error()
+ || cached_charstrings.in_error ()
+ || parsed_charstrings.in_error ()
+ || parsed_global_subrs->in_error ()
+ || closures.in_error ())) {
+ return false;
+ }
+
+ /* phase 1 & 2 */
+ for (auto _ : plan->new_to_old_gid_list)
+ {
+ hb_codepoint_t new_glyph = _.first;
+ hb_codepoint_t old_glyph = _.second;
+
+ const hb_ubytes_t str = (*acc.charStrings)[old_glyph];
+ unsigned int fd = acc.fdSelect->get_fd (old_glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+
+ if (cff_accelerator)
+ {
+ // parsed string already exists in accelerator, copy it and move
+ // on.
+ if (cached_charstrings)
+ cached_charstrings[new_glyph] = &cff_accelerator->parsed_charstrings[old_glyph];
+ else
+ parsed_charstrings[new_glyph] = cff_accelerator->parsed_charstrings[old_glyph];
+
+ continue;
+ }
+
+ ENV env (str, acc, fd);
+ cs_interpreter_t<ENV, OPSET, subr_subset_param_t> interp (env);
+
+ parsed_charstrings[new_glyph].alloc (str.length);
+ subr_subset_param_t param (&parsed_charstrings[new_glyph],
+ &parsed_global_subrs_storage,
+ &parsed_local_subrs_storage[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[new_glyph]);
+
+ /* mark hint ops and arguments for drop */
+ if ((plan->flags & HB_SUBSET_FLAGS_NO_HINTING) || plan->inprogress_accelerator)
+ {
+ subr_subset_param_t param (&parsed_charstrings[new_glyph],
+ &parsed_global_subrs_storage,
+ &parsed_local_subrs_storage[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[new_glyph], param, drop))
+ {
+ parsed_charstrings[new_glyph].set_hint_dropped ();
+ if (drop.vsindex_dropped)
+ parsed_charstrings[new_glyph].set_vsindex_dropped ();
+ }
+ }
+
+ /* Doing this here one by one instead of compacting all at the end
+ * has massive peak-memory saving.
+ *
+ * The compacting both saves memory and makes further operations
+ * faster.
+ */
+ parsed_charstrings[new_glyph].compact ();
+ }
+
+ /* Since parsed strings were loaded from accelerator, we still need
+ * to compute the subroutine closures which would have normally happened during
+ * parsing.
+ *
+ * Or if we are dropping hinting, redo closure to get actually used subrs.
+ */
+ if ((cff_accelerator ||
+ (!cff_accelerator && plan->flags & HB_SUBSET_FLAGS_NO_HINTING)) &&
+ !closure_subroutines(*parsed_global_subrs,
+ *parsed_local_subrs))
+ return false;
+
+ remaps.create (closures);
+
+ populate_subset_accelerator ();
+ return true;
+ }
+
+ bool encode_charstrings (str_buff_vec_t &buffArray, bool encode_prefix = true) const
+ {
+ unsigned num_glyphs = plan->num_output_glyphs ();
+ if (unlikely (!buffArray.resize_exact (num_glyphs)))
+ return false;
+ hb_codepoint_t last = 0;
+ for (auto _ : plan->new_to_old_gid_list)
+ {
+ hb_codepoint_t gid = _.first;
+ hb_codepoint_t old_glyph = _.second;
+
+ if (endchar_op != OpCode_Invalid)
+ for (; last < gid; last++)
+ {
+ // Hack to point vector to static string.
+ auto &b = buffArray.arrayZ[last];
+ b.length = 1;
+ b.arrayZ = const_cast<unsigned char *>(endchar_str);
+ }
+
+ last++; // Skip over gid
+ unsigned int fd = acc.fdSelect->get_fd (old_glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+ if (unlikely (!encode_str (get_parsed_charstring (gid), fd, buffArray.arrayZ[gid], encode_prefix)))
+ return false;
+ }
+ if (endchar_op != OpCode_Invalid)
+ for (; last < num_glyphs; last++)
+ {
+ // Hack to point vector to static string.
+ auto &b = buffArray.arrayZ[last];
+ b.length = 1;
+ b.arrayZ = const_cast<unsigned char *>(endchar_str);
+ }
+
+ 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_exact (count)))
+ return false;
+ for (unsigned int new_num = 0; new_num < count; new_num++)
+ {
+ hb_codepoint_t old_num = remap.backward (new_num);
+ assert (old_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_hinting ();
+ /* 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_hinting ();
+ }
+
+ 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;
+
+ unsigned count = str.values.length;
+ auto *values = str.values.arrayZ;
+ for (unsigned int pos = 0; pos < count; pos++)
+ {
+ bool has_hint = false;
+ switch (values[pos].op)
+ {
+ case OpCode_callsubr:
+ has_hint = drop_hints_in_subr (str, pos,
+ *param.parsed_local_subrs, values[pos].subr_num,
+ param, drop);
+ break;
+
+ case OpCode_callgsubr:
+ has_hint = drop_hints_in_subr (str, pos,
+ *param.parsed_global_subrs, 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)
+ {
+ values[pos].set_hinting ();
+ break;
+ }
+ HB_FALLTHROUGH;
+
+ case OpCode_hstemhm:
+ case OpCode_vstemhm:
+ case OpCode_hstem:
+ case OpCode_vstem:
+ has_hint = true;
+ values[pos].set_hinting ();
+ if (str.at_end (pos))
+ drop.ends_in_hint = true;
+ break;
+
+ case OpCode_dotsection:
+ values[pos].set_hinting ();
+ break;
+
+ default:
+ /* NONE */
+ break;
+ }
+ if (has_hint)
+ {
+ for (int i = pos - 1; i >= 0; i--)
+ {
+ parsed_cs_op_t &csop = values[(unsigned)i];
+ if (csop.is_hinting ())
+ break;
+ csop.set_hinting ();
+ 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 < count; pos++)
+ {
+ parsed_cs_op_t &csop = values[pos];
+ if (csop.op == OpCode_return)
+ break;
+ if (!csop.is_hinting ())
+ {
+ drop.all_dropped = false;
+ break;
+ }
+ }
+
+ return seen_hint;
+ }
+
+ bool closure_subroutines (const parsed_cs_str_vec_t& global_subrs,
+ const hb_vector_t<parsed_cs_str_vec_t>& local_subrs)
+ {
+ closures.reset ();
+ for (auto _ : plan->new_to_old_gid_list)
+ {
+ hb_codepoint_t new_glyph = _.first;
+ hb_codepoint_t old_glyph = _.second;
+ unsigned int fd = acc.fdSelect->get_fd (old_glyph);
+ if (unlikely (fd >= acc.fdCount))
+ return false;
+
+ // Note: const cast is safe here because the collect_subr_refs_in_str only performs a
+ // closure and does not modify any of the charstrings.
+ subr_subset_param_t param (const_cast<parsed_cs_str_t*> (&get_parsed_charstring (new_glyph)),
+ const_cast<parsed_cs_str_vec_t*> (&global_subrs),
+ const_cast<parsed_cs_str_vec_t*> (&local_subrs[fd]),
+ &closures.global_closure,
+ &closures.local_closures[fd],
+ plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
+ collect_subr_refs_in_str (get_parsed_charstring (new_glyph), param);
+ }
+
+ return true;
+ }
+
+ void collect_subr_refs_in_subr (unsigned int subr_num, parsed_cs_str_vec_t &subrs,
+ hb_set_t *closure,
+ const subr_subset_param_t &param)
+ {
+ if (closure->has (subr_num))
+ return;
+ closure->add (subr_num);
+ collect_subr_refs_in_str (subrs[subr_num], param);
+ }
+
+ void collect_subr_refs_in_str (const parsed_cs_str_t &str,
+ const subr_subset_param_t &param)
+ {
+ if (!str.has_calls ())
+ return;
+
+ for (auto &opstr : str.values)
+ {
+ if (!param.drop_hints || !opstr.is_hinting ())
+ {
+ switch (opstr.op)
+ {
+ case OpCode_callsubr:
+ collect_subr_refs_in_subr (opstr.subr_num, *param.parsed_local_subrs,
+ param.local_closure, param);
+ break;
+
+ case OpCode_callgsubr:
+ collect_subr_refs_in_subr (opstr.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, bool encode_prefix = true) const
+ {
+ str_encoder_t encoder (buff);
+ encoder.reset ();
+ bool hinting = !(plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
+ /* if a prefix (CFF1 width or CFF2 vsindex) has been removed along with hints,
+ * re-insert it at the beginning of charstreing */
+ if (encode_prefix && str.has_prefix () && !hinting && str.is_hint_dropped ())
+ {
+ encoder.encode_num_cs (str.prefix_num ());
+ if (str.prefix_op () != OpCode_Invalid)
+ encoder.encode_op (str.prefix_op ());
+ }
+
+ unsigned size = 0;
+ for (auto &opstr : str.values)
+ {
+ size += opstr.length;
+ if (opstr.op == OpCode_callsubr || opstr.op == OpCode_callgsubr)
+ size += 3;
+ }
+ if (!buff.alloc (buff.length + size, true))
+ return false;
+
+ for (auto &opstr : str.values)
+ {
+ if (hinting || !opstr.is_hinting ())
+ {
+ switch (opstr.op)
+ {
+ case OpCode_callsubr:
+ encoder.encode_int (remaps.local_remaps[fd].biased_num (opstr.subr_num));
+ encoder.copy_str (opstr.ptr, opstr.length);
+ break;
+
+ case OpCode_callgsubr:
+ encoder.encode_int (remaps.global_remap.biased_num (opstr.subr_num));
+ encoder.copy_str (opstr.ptr, opstr.length);
+ break;
+
+ default:
+ encoder.copy_str (opstr.ptr, opstr.length);
+ break;
+ }
+ }
+ }
+ return !encoder.in_error ();
+ }
+
+ void compact_parsed_subrs () const
+ {
+ for (auto &cs : parsed_global_subrs_storage)
+ cs.compact ();
+ for (auto &vec : parsed_local_subrs_storage)
+ for (auto &cs : vec)
+ cs.compact ();
+ }
+
+ void populate_subset_accelerator () const
+ {
+ if (!plan->inprogress_accelerator) return;
+
+ compact_parsed_subrs ();
+
+ acc.cff_accelerator =
+ cff_subset_accelerator_t::create(acc.blob,
+ parsed_charstrings,
+ parsed_global_subrs_storage,
+ parsed_local_subrs_storage);
+ }
+
+ const parsed_cs_str_t& get_parsed_charstring (unsigned i) const
+ {
+ if (cached_charstrings) return *(cached_charstrings[i]);
+ return parsed_charstrings[i];
+ }
+
+ protected:
+ const ACC &acc;
+ const hb_subset_plan_t *plan;
+
+ subr_closures_t closures;
+
+ hb_vector_t<const parsed_cs_str_t*> cached_charstrings;
+ const parsed_cs_str_vec_t* parsed_global_subrs;
+ const hb_vector_t<parsed_cs_str_vec_t>* parsed_local_subrs;
+
+ subr_remaps_t remaps;
+
+ private:
+
+ parsed_cs_str_vec_t parsed_charstrings;
+ parsed_cs_str_vec_t parsed_global_subrs_storage;
+ hb_vector_t<parsed_cs_str_vec_t> parsed_local_subrs_storage;
+ 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 2024-05-06 11:13:49 +0000