275 lines
7.4 KiB
C++
275 lines
7.4 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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#ifndef HB_CFF2_INTERP_CS_HH
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#define HB_CFF2_INTERP_CS_HH
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#include "hb.hh"
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#include "hb-cff-interp-cs-common.hh"
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namespace CFF {
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using namespace OT;
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struct blend_arg_t : number_t
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{
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void set_int (int v) { reset_blends (); number_t::set_int (v); }
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void set_fixed (int32_t v) { reset_blends (); number_t::set_fixed (v); }
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void set_real (double v) { reset_blends (); number_t::set_real (v); }
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void set_blends (unsigned int numValues_, unsigned int valueIndex_,
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unsigned int numBlends, hb_array_t<const blend_arg_t> blends_)
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{
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numValues = numValues_;
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valueIndex = valueIndex_;
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deltas.resize (numBlends);
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for (unsigned int i = 0; i < numBlends; i++)
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deltas[i] = blends_[i];
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}
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bool blending () const { return deltas.length > 0; }
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void reset_blends ()
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{
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numValues = valueIndex = 0;
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deltas.resize (0);
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}
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unsigned int numValues;
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unsigned int valueIndex;
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hb_vector_t<number_t> deltas;
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};
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typedef interp_env_t<blend_arg_t> BlendInterpEnv;
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typedef biased_subrs_t<CFF2Subrs> cff2_biased_subrs_t;
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template <typename ELEM>
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struct cff2_cs_interp_env_t : cs_interp_env_t<ELEM, CFF2Subrs>
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{
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template <typename ACC>
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cff2_cs_interp_env_t (const hb_ubytes_t &str, ACC &acc, unsigned int fd,
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const int *coords_=nullptr, unsigned int num_coords_=0)
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: SUPER (str, acc.globalSubrs, acc.privateDicts[fd].localSubrs)
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{
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coords = coords_;
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num_coords = num_coords_;
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varStore = acc.varStore;
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seen_blend = false;
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seen_vsindex_ = false;
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scalars.init ();
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do_blend = num_coords && coords && varStore->size;
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set_ivs (acc.privateDicts[fd].ivs);
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}
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void fini ()
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{
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scalars.fini ();
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SUPER::fini ();
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}
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op_code_t fetch_op ()
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{
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if (this->str_ref.avail ())
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return SUPER::fetch_op ();
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/* make up return or endchar op */
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if (this->callStack.is_empty ())
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return OpCode_endchar;
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else
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return OpCode_return;
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}
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const ELEM& eval_arg (unsigned int i)
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{
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return SUPER::argStack[i];
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}
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const ELEM& pop_arg ()
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{
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return SUPER::argStack.pop ();
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}
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void process_blend ()
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{
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if (!seen_blend)
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{
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region_count = varStore->varStore.get_region_index_count (get_ivs ());
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if (do_blend)
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{
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if (unlikely (!scalars.resize (region_count)))
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SUPER::set_error ();
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else
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varStore->varStore.get_region_scalars (get_ivs (), coords, num_coords,
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&scalars[0], region_count);
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}
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seen_blend = true;
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}
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}
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void process_vsindex ()
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{
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unsigned int index = SUPER::argStack.pop_uint ();
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if (unlikely (seen_vsindex () || seen_blend))
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{
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SUPER::set_error ();
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}
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else
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{
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set_ivs (index);
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}
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seen_vsindex_ = true;
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}
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unsigned int get_region_count () const { return region_count; }
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void set_region_count (unsigned int region_count_) { region_count = region_count_; }
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unsigned int get_ivs () const { return ivs; }
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void set_ivs (unsigned int ivs_) { ivs = ivs_; }
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bool seen_vsindex () const { return seen_vsindex_; }
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double blend_deltas (hb_array_t<const ELEM> deltas) const
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{
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double v = 0;
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if (do_blend)
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{
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if (likely (scalars.length == deltas.length))
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{
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for (unsigned int i = 0; i < scalars.length; i++)
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v += (double) scalars[i] * deltas[i].to_real ();
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}
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}
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return v;
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}
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protected:
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const int *coords;
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unsigned int num_coords;
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const CFF2VariationStore *varStore;
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unsigned int region_count;
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unsigned int ivs;
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hb_vector_t<float> scalars;
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bool do_blend;
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bool seen_vsindex_;
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bool seen_blend;
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typedef cs_interp_env_t<ELEM, CFF2Subrs> SUPER;
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};
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template <typename OPSET, typename PARAM, typename ELEM, typename PATH=path_procs_null_t<cff2_cs_interp_env_t<ELEM>, PARAM>>
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struct cff2_cs_opset_t : cs_opset_t<ELEM, OPSET, cff2_cs_interp_env_t<ELEM>, PARAM, PATH>
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{
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static void process_op (op_code_t op, cff2_cs_interp_env_t<ELEM> &env, PARAM& param)
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{
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switch (op) {
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case OpCode_callsubr:
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case OpCode_callgsubr:
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/* a subroutine number shouldn't be a blended value */
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#if 0
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if (unlikely (env.argStack.peek ().blending ()))
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{
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env.set_error ();
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break;
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}
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#endif
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SUPER::process_op (op, env, param);
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break;
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case OpCode_blendcs:
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OPSET::process_blend (env, param);
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break;
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case OpCode_vsindexcs:
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#if 0
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if (unlikely (env.argStack.peek ().blending ()))
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{
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env.set_error ();
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break;
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}
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#endif
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OPSET::process_vsindex (env, param);
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break;
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default:
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SUPER::process_op (op, env, param);
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}
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}
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template <typename T = ELEM,
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hb_enable_if (hb_is_same (T, blend_arg_t))>
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static void process_arg_blend (cff2_cs_interp_env_t<ELEM> &env,
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ELEM &arg,
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const hb_array_t<const ELEM> blends,
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unsigned n, unsigned i)
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{
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arg.set_blends (n, i, blends.length, blends);
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}
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template <typename T = ELEM,
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hb_enable_if (!hb_is_same (T, blend_arg_t))>
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static void process_arg_blend (cff2_cs_interp_env_t<ELEM> &env,
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ELEM &arg,
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const hb_array_t<const ELEM> blends,
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unsigned n, unsigned i)
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{
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arg.set_real (arg.to_real () + env.blend_deltas (blends));
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}
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static void process_blend (cff2_cs_interp_env_t<ELEM> &env, PARAM& param)
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{
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unsigned int n, k;
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env.process_blend ();
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k = env.get_region_count ();
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n = env.argStack.pop_uint ();
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/* copy the blend values into blend array of the default values */
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unsigned int start = env.argStack.get_count () - ((k+1) * n);
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/* let an obvious error case fail, but note CFF2 spec doesn't forbid n==0 */
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if (unlikely (start > env.argStack.get_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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for (unsigned int i = 0; i < n; i++)
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{
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const hb_array_t<const ELEM> blends = env.argStack.sub_array (start + n + (i * k), k);
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process_arg_blend (env, env.argStack[start + i], blends, n, i);
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}
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/* pop off blend values leaving default values now adorned with blend values */
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env.argStack.pop (k * n);
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}
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static void process_vsindex (cff2_cs_interp_env_t<ELEM> &env, PARAM& param)
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{
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env.process_vsindex ();
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env.clear_args ();
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}
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private:
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typedef cs_opset_t<ELEM, OPSET, cff2_cs_interp_env_t<ELEM>, PARAM, PATH> SUPER;
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};
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template <typename OPSET, typename PARAM, typename ELEM>
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using cff2_cs_interpreter_t = cs_interpreter_t<cff2_cs_interp_env_t<ELEM>, OPSET, PARAM>;
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} /* namespace CFF */
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#endif /* HB_CFF2_INTERP_CS_HH */
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