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Diffstat (limited to 'gfx/harfbuzz/src/hb-subset-instancer-solver.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-subset-instancer-solver.hh | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-subset-instancer-solver.hh b/gfx/harfbuzz/src/hb-subset-instancer-solver.hh new file mode 100644 index 0000000000..563fccbb59 --- /dev/null +++ b/gfx/harfbuzz/src/hb-subset-instancer-solver.hh @@ -0,0 +1,112 @@ +/* + * 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 */ |