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+/*
+ * Copyright © 2023 Behdad Esfahbod
+ *
+ * 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.
+ */
+
+#ifndef HB_SUBSET_INSTANCER_SOLVER_HH
+#define HB_SUBSET_INSTANCER_SOLVER_HH
+
+#include "hb.hh"
+
+/* pre-normalized distances */
+struct TripleDistances
+{
+ TripleDistances (): negative (1.f), positive (1.f) {}
+ TripleDistances (float neg_, float pos_): negative (neg_), positive (pos_) {}
+ TripleDistances (float min, float default_, float max)
+ {
+ negative = default_ - min;
+ positive = max - default_;
+ }
+
+ float negative;
+ float positive;
+};
+
+struct Triple {
+
+ Triple () :
+ minimum (0.f), middle (0.f), maximum (0.f) {}
+
+ Triple (float minimum_, float middle_, float maximum_) :
+ minimum (minimum_), middle (middle_), maximum (maximum_) {}
+
+ bool operator == (const Triple &o) const
+ {
+ return minimum == o.minimum &&
+ middle == o.middle &&
+ maximum == o.maximum;
+ }
+
+ bool operator != (const Triple o) const
+ { return !(*this == o); }
+
+ bool is_point () const
+ { return minimum == middle && middle == maximum; }
+
+ bool contains (float point) const
+ { return minimum <= point && point <= maximum; }
+
+ /* from hb_array_t hash ()*/
+ uint32_t hash () const
+ {
+ uint32_t current = /*cbf29ce4*/0x84222325;
+ current = current ^ hb_hash (minimum);
+ current = current * 16777619;
+
+ current = current ^ hb_hash (middle);
+ current = current * 16777619;
+
+ current = current ^ hb_hash (maximum);
+ current = current * 16777619;
+ return current;
+ }
+
+
+ float minimum;
+ float middle;
+ float maximum;
+};
+
+using result_item_t = hb_pair_t<float, Triple>;
+using result_t = hb_vector_t<result_item_t>;
+
+/* renormalize a normalized value v to the range of an axis,
+ * considering the prenormalized distances as well as the new axis limits.
+ * Ported from fonttools */
+HB_INTERNAL float renormalizeValue (float v, const Triple &triple,
+ const TripleDistances &triple_distances,
+ bool extrapolate = true);
+/* Given a tuple (lower,peak,upper) "tent" and new axis limits
+ * (axisMin,axisDefault,axisMax), solves how to represent the tent
+ * under the new axis configuration. All values are in normalized
+ * -1,0,+1 coordinate system. Tent values can be outside this range.
+ *
+ * Return value: a list of tuples. Each tuple is of the form
+ * (scalar,tent), where scalar is a multipler to multiply any
+ * delta-sets by, and tent is a new tent for that output delta-set.
+ * If tent value is Triple{}, that is a special deltaset that should
+ * be always-enabled (called "gain").
+ */
+HB_INTERNAL result_t rebase_tent (Triple tent, Triple axisLimit, TripleDistances axis_triple_distances);
+
+#endif /* HB_SUBSET_INSTANCER_SOLVER_HH */