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In fractional-scale-v1, the scaling is defined as follows: > For toplevel surfaces, the size is rounded halfway away from zero. Previously, it is undefined. This commit makes waylandScaleMulInt follow the round half away from zero behaviour.
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2026 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdint.h>
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struct WaylandScale
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{
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int32_t num;
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int32_t den;
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};
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static inline struct WaylandScale waylandScaleFromInt(int32_t scale)
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{
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return (struct WaylandScale) { scale, 1 };
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}
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static inline struct WaylandScale waylandScaleFromRatio(int32_t num, int32_t den)
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{
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return (struct WaylandScale) { num, den };
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}
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static inline bool waylandScaleValid(struct WaylandScale scale)
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{
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return scale.num > 0 && scale.den > 0;
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}
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static inline bool waylandScaleEqual(struct WaylandScale a, struct WaylandScale b)
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{
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return (int64_t)a.num * b.den == (int64_t)b.num * a.den;
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}
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static inline int waylandScaleCmp(struct WaylandScale a, struct WaylandScale b)
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{
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int64_t lhs = (int64_t)a.num * b.den;
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int64_t rhs = (int64_t)b.num * a.den;
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return (lhs > rhs) - (lhs < rhs);
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}
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static inline bool waylandScaleIsFractional(struct WaylandScale scale)
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{
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return waylandScaleValid(scale) && scale.num % scale.den != 0;
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}
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static inline int waylandScaleFloor(struct WaylandScale scale)
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{
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return scale.num / scale.den;
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}
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static inline int waylandScaleCeil(struct WaylandScale scale)
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{
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return (scale.num + scale.den - 1) / scale.den;
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}
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static inline int waylandScaleMulInt(struct WaylandScale scale, int value)
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{
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return (int)(((int64_t)value * scale.num + scale.den / 2) / scale.den);
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}
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static inline double waylandScaleToDouble(struct WaylandScale scale)
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{
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return (double)scale.num / (double)scale.den;
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}
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