40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/*
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* Copyright (c) 2014, 2015, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* damage-rect.c
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* Damage rectangles.
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*/
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#include <stddef.h>
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#include "damage-rect.h"
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struct damage_rect damage_rect_add(struct damage_rect a, struct damage_rect b)
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{
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if ( !a.width || !a.height )
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return b;
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if ( !b.width || !b.height )
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return a;
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if ( a.left < b.left )
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b.width += b.left - a.left, b.left = a.left;
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if ( b.width < a.width )
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b.width = a.width;
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if ( a.top < b.top )
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b.height += b.top - a.top, b.top = a.top;
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if ( b.height < a.height )
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b.height = a.height;
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return b;
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}
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