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+/* GRAPHITE2 LICENSING
+
+ Copyright 2010, SIL International
+ All rights reserved.
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should also have received a copy of the GNU Lesser General Public
+ License along with this library in the file named "LICENSE".
+ If not, write to the Free Software Foundation, 51 Franklin Street,
+ Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+ internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+#pragma once
+
+#include <utility>
+
+#include "inc/Main.h"
+#include "inc/List.h"
+#include "inc/json.h"
+#include "inc/Position.h"
+
+// An IntervalSet represents the possible movement of a given glyph in a given direction
+// (horizontally, vertically, or diagonally).
+// A vector is needed to represent disjoint ranges, eg, -300..-150, 20..200, 500..750.
+// Each pair represents the min/max of a sub-range.
+
+namespace graphite2 {
+
+class Segment;
+
+enum zones_t {SD, XY};
+
+class Zones
+{
+ struct Exclusion
+ {
+ template<zones_t O>
+ static Exclusion weighted(float xmin, float xmax, float f, float a0,
+ float m, float xi, float ai, float c, bool nega);
+
+ float x, // x position
+ xm, // xmax position
+ c, // constant + sum(MiXi^2)
+ sm, // sum(Mi)
+ smx; // sum(MiXi)
+ bool open;
+
+ Exclusion(float x, float w, float smi, float smxi, float c);
+ Exclusion & operator += (Exclusion const & rhs);
+ uint8 outcode(float p) const;
+
+ Exclusion split_at(float p);
+ void left_trim(float p);
+
+ bool track_cost(float & cost, float & x, float origin) const;
+
+ private:
+ float test_position(float origin) const;
+ float cost(float x) const;
+ };
+
+ typedef Vector<Exclusion> exclusions;
+
+ typedef exclusions::iterator iterator;
+ typedef Exclusion * pointer;
+ typedef Exclusion & reference;
+ typedef std::reverse_iterator<iterator> reverse_iterator;
+
+public:
+ typedef exclusions::const_iterator const_iterator;
+ typedef Exclusion const * const_pointer;
+ typedef Exclusion const & const_reference;
+ typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+
+#if !defined GRAPHITE2_NTRACING
+ struct Debug
+ {
+ Exclusion _excl;
+ bool _isdel;
+ Vector<void *> _env;
+
+ Debug(Exclusion *e, bool isdel, json *dbg) : _excl(*e), _isdel(isdel), _env(dbg->getenvs()) { };
+ };
+
+ typedef Vector<Debug> debugs;
+ typedef debugs::const_iterator idebugs;
+ void addDebug(Exclusion *e);
+ void removeDebug(float pos, float posm);
+ void setdebug(json *dbgout) { _dbg = dbgout; }
+ idebugs dbgs_begin() const { return _dbgs.begin(); }
+ idebugs dbgs_end() const { return _dbgs.end(); }
+ void jsonDbgOut(Segment *seg) const;
+ Position position() const { return Position(_pos, _posm); }
+#endif
+
+ Zones();
+ template<zones_t O>
+ void initialise(float xmin, float xmax, float margin_len, float margin_weight, float ao);
+
+ void exclude(float xmin, float xmax);
+ void exclude_with_margins(float xmin, float xmax, int axis);
+
+ template<zones_t O>
+ void weighted(float xmin, float xmax, float f, float a0, float mi, float xi, float ai, float c, bool nega);
+ void weightedAxis(int axis, float xmin, float xmax, float f, float a0, float mi, float xi, float ai, float c, bool nega);
+
+ float closest( float origin, float &cost) const;
+
+ const_iterator begin() const { return _exclusions.begin(); }
+ const_iterator end() const { return _exclusions.end(); }
+
+private:
+ exclusions _exclusions;
+#if !defined GRAPHITE2_NTRACING
+ json * _dbg;
+ debugs _dbgs;
+#endif
+ float _margin_len,
+ _margin_weight,
+ _pos,
+ _posm;
+
+ void insert(Exclusion e);
+ void remove(float x, float xm);
+ const_iterator find_exclusion_under(float x) const;
+};
+
+
+inline
+Zones::Zones()
+: _margin_len(0), _margin_weight(0), _pos(0), _posm(0)
+{
+#if !defined GRAPHITE2_NTRACING
+ _dbg = 0;
+#endif
+ _exclusions.reserve(8);
+}
+
+inline
+Zones::Exclusion::Exclusion(float x_, float xm_, float smi, float smxi, float c_)
+: x(x_), xm(xm_), c(c_), sm(smi), smx(smxi), open(false)
+{ }
+
+template<zones_t O>
+inline
+void Zones::initialise(float xmin, float xmax, float margin_len,
+ float margin_weight, float a0)
+{
+ _margin_len = margin_len;
+ _margin_weight = margin_weight;
+ _pos = xmin;
+ _posm = xmax;
+ _exclusions.clear();
+ _exclusions.push_back(Exclusion::weighted<O>(xmin, xmax, 1, a0, 0, 0, 0, 0, false));
+ _exclusions.front().open = true;
+#if !defined GRAPHITE2_NTRACING
+ _dbgs.clear();
+#endif
+}
+
+inline
+void Zones::exclude(float xmin, float xmax) {
+ remove(xmin, xmax);
+}
+
+template<zones_t O>
+inline
+void Zones::weighted(float xmin, float xmax, float f, float a0,
+ float m, float xi, float ai, float c, bool nega) {
+ insert(Exclusion::weighted<O>(xmin, xmax, f, a0, m, xi, ai, c, nega));
+}
+
+inline
+void Zones::weightedAxis(int axis, float xmin, float xmax, float f, float a0,
+ float m, float xi, float ai, float c, bool nega) {
+ if (axis < 2)
+ weighted<XY>(xmin, xmax, f, a0, m, xi, ai, c, nega);
+ else
+ weighted<SD>(xmin, xmax, f, a0, m, xi, ai, c, nega);
+}
+
+#if !defined GRAPHITE2_NTRACING
+inline
+void Zones::addDebug(Exclusion *e) {
+ if (_dbg)
+ _dbgs.push_back(Debug(e, false, _dbg));
+}
+
+inline
+void Zones::removeDebug(float pos, float posm) {
+ if (_dbg)
+ {
+ Exclusion e(pos, posm, 0, 0, 0);
+ _dbgs.push_back(Debug(&e, true, _dbg));
+ }
+}
+#endif
+
+template<>
+inline
+Zones::Exclusion Zones::Exclusion::weighted<XY>(float xmin, float xmax, float f, float a0,
+ float m, float xi, GR_MAYBE_UNUSED float ai, float c, GR_MAYBE_UNUSED bool nega) {
+ return Exclusion(xmin, xmax,
+ m + f,
+ m * xi,
+ m * xi * xi + f * a0 * a0 + c);
+}
+
+template<>
+inline
+Zones::Exclusion Zones::Exclusion::weighted<SD>(float xmin, float xmax, float f, float a0,
+ float m, float xi, float ai,float c, bool nega) {
+ float xia = nega ? xi - ai : xi + ai;
+ return Exclusion(xmin, xmax,
+ 0.25f * (m + 2.f * f),
+ 0.25f * m * xia,
+ 0.25f * (m * xia * xia + 2.f * f * a0 * a0) + c);
+}
+
+} // end of namespace graphite2
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