263 lines
7.1 KiB
C++
263 lines
7.1 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 BlendArg : Number
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{
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inline void init (void)
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{
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Number::init ();
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deltas.init ();
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}
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inline void fini (void)
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{
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Number::fini ();
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deltas.fini_deep ();
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}
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inline void set_int (int v) { reset_blends (); Number::set_int (v); }
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inline void set_fixed (int32_t v) { reset_blends (); Number::set_fixed (v); }
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inline void set_real (float v) { reset_blends (); Number::set_real (v); }
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inline void set_blends (unsigned int numValues_, unsigned int valueIndex_,
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unsigned int numBlends, const BlendArg *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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inline bool blending (void) const { return deltas.len > 0; }
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inline void reset_blends (void)
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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> deltas;
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};
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typedef InterpEnv<BlendArg> BlendInterpEnv;
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typedef BiasedSubrs<CFF2Subrs> CFF2BiasedSubrs;
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struct CFF2CSInterpEnv : CSInterpEnv<BlendArg, CFF2Subrs>
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{
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template <typename ACC>
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inline void init (const ByteStr &str, ACC &acc, unsigned int fd,
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const int *coords_=nullptr, unsigned int num_coords_=0)
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{
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SUPER::init (str, *acc.globalSubrs, *acc.privateDicts[fd].localSubrs);
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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 = (coords != nullptr) && num_coords && (varStore != &Null(CFF2VariationStore));
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set_ivs (acc.privateDicts[fd].ivs);
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}
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inline void fini (void)
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{
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scalars.fini ();
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SUPER::fini ();
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}
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inline OpCode fetch_op (void)
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{
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if (this->substr.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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inline const BlendArg& eval_arg (unsigned int i)
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{
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BlendArg &arg = argStack[i];
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blend_arg (arg);
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return arg;
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}
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inline const BlendArg& pop_arg (void)
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{
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BlendArg &arg = argStack.pop ();
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blend_arg (arg);
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return arg;
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}
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inline void process_blend (void)
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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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scalars.resize (region_count);
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varStore->varStore.get_scalars (get_ivs (),
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(int *)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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inline void process_vsindex (void)
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{
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unsigned int index = argStack.pop_uint ();
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if (unlikely (seen_vsindex () || seen_blend))
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{
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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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inline unsigned int get_region_count (void) const { return region_count; }
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inline void set_region_count (unsigned int region_count_) { region_count = region_count_; }
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inline unsigned int get_ivs (void) const { return ivs; }
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inline void set_ivs (unsigned int ivs_) { ivs = ivs_; }
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inline bool seen_vsindex (void) const { return seen_vsindex_; }
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protected:
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inline void blend_arg (BlendArg &arg)
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{
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if (do_blend && arg.blending ())
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{
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if (likely (scalars.len == arg.deltas.len))
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{
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float v = arg.to_real ();
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for (unsigned int i = 0; i < scalars.len; i++)
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{
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v += scalars[i] * arg.deltas[i].to_real ();
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}
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arg.set_real (v);
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arg.deltas.resize (0);
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}
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}
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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 CSInterpEnv<BlendArg, CFF2Subrs> SUPER;
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};
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template <typename OPSET, typename PARAM, typename PATH=PathProcsNull<CFF2CSInterpEnv, PARAM> >
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struct CFF2CSOpSet : CSOpSet<BlendArg, OPSET, CFF2CSInterpEnv, PARAM, PATH>
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{
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static inline void process_op (OpCode op, CFF2CSInterpEnv &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 shoudln't be a blended value */
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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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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 (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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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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static inline void process_blend (CFF2CSInterpEnv &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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for (unsigned int i = 0; i < n; i++)
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env.argStack[start + i].set_blends (n, i, k, &env.argStack[start + n + (i * k)]);
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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 inline void process_vsindex (CFF2CSInterpEnv &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 CSOpSet<BlendArg, OPSET, CFF2CSInterpEnv, PARAM, PATH> SUPER;
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};
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template <typename OPSET, typename PARAM>
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struct CFF2CSInterpreter : CSInterpreter<CFF2CSInterpEnv, OPSET, PARAM> {};
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} /* namespace CFF */
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#endif /* HB_CFF2_INTERP_CS_HH */
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