feat: godot-engine-source-4.3-stable

engine/thirdparty/harfbuzz/src/hb-subset-instancer-solver.hh

@@ -0,0 +1,114 @@
+/*
+ * 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 (1.0), positive (1.0) {}
+  TripleDistances (double neg_, double pos_): negative (neg_), positive (pos_) {}
+  TripleDistances (double min, double default_, double max)
+  {
+    negative = default_ - min;
+    positive = max - default_;
+  }
+
+  double negative;
+  double positive;
+};
+
+struct Triple {
+
+  Triple () :
+    minimum (0.0), middle (0.0), maximum (0.0) {}
+
+  Triple (double minimum_, double middle_, double 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 (double 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;
+  }
+
+
+  double minimum;
+  double middle;
+  double maximum;
+};
+
+using rebase_tent_result_item_t = hb_pair_t<double, Triple>;
+using rebase_tent_result_t = hb_vector_t<rebase_tent_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 double renormalizeValue (double 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 rebase_tent_result_t rebase_tent (Triple tent,
+					      Triple axisLimit,
+					      TripleDistances axis_triple_distances);
+
+#endif /* HB_SUBSET_INSTANCER_SOLVER_HH */