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https://github.com/cage-kiosk/cage.git
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395189fb05
- Update wlr_box includes to util/box.h: the wlroots header has been moved upstream. - Subsurface fields have been moved - Create renderer and allocator, stop using wlr_backend_get_renderer - Initalize output rendering
34 lines
944 B
C
34 lines
944 B
C
/*
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* Cage: A Wayland kiosk.
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*
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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 "util.h"
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int
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scale_length(int length, int offset, float scale)
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{
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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 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, float scale)
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{
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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 = round(box->x * scale);
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box->y = round(box->y * scale);
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}
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