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35 lines
1 KiB
C
35 lines
1 KiB
C
/*
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* Cagebreak: A Wayland tiling compositor.
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*
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* Copyright (C) 2020 The Cagebreak Authors
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* Copyright (C) 2019 The Sway authors
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*
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* See the LICENSE file accompanying this file.
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*/
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#include <wlr/types/wlr_box.h>
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#include "util.h"
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int
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scale_length(int length, int offset, double scale) {
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/**
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* One does not simply multiply the width by the scale. We allow fractional
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* scaling, which means the resulting scaled width might be a decimal.
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* So we round it.
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*
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* But even this can produce undesirable results depending on the X or Y
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* offset of the box. For example, with a scale of 1.5, a box with
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* width=1 should not scale to 2px if its X coordinate is 1, because the
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* X coordinate would have scaled to 2px.
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*/
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return (int)(round((offset + length) * scale) - round(offset * scale));
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}
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void
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scale_box(struct wlr_box *box, double scale) {
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box->width = scale_length(box->width, box->x, scale);
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box->height = scale_length(box->height, box->y, scale);
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box->x = (int)round(box->x * scale);
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box->y = (int)round(box->y * scale);
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}
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