54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)pr_clip.c 1.1 94/10/31 Copyr 1983 Sun Micro";
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#endif
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/*
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* Copyright (c) 1983 by Sun Microsystems, Inc.
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*/
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#include <sys/types.h>
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#include <pixrect/pixrect.h>
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#define pr_clip1(pra,size,prb) { \
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if ((pra)->pos.x<0) { \
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(prb)->pos.x -= (pra)->pos.x; \
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(size)->x += (pra)->pos.x; \
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(pra)->pos.x = 0; \
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} \
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if ((pra)->pos.y<0) { \
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(prb)->pos.y -= (pra)->pos.y; \
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(size)->y += (pra)->pos.y; \
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(pra)->pos.y = 0; \
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} \
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if ((pra)->pos.x + (size)->x > (pra)->pr->pr_size.x) \
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(size)->x = (pra)->pr->pr_size.x - (pra)->pos.x; \
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if ((pra)->pos.y + (size)->y > (pra)->pr->pr_size.y) \
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(size)->y = (pra)->pr->pr_size.y - (pra)->pos.y; \
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}
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#define pr_clip2(pra,size) { \
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if ((pra)->pos.x<0) { \
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(size)->x += (pra)->pos.x; \
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(pra)->pos.x = 0; \
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} \
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if ((pra)->pos.y<0) { \
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(size)->y += (pra)->pos.y; \
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(pra)->pos.y = 0; \
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} \
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if ((pra)->pos.x + (size)->x > (pra)->pr->pr_size.x) \
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(size)->x = (pra)->pr->pr_size.x - (pra)->pos.x; \
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if ((pra)->pos.y + (size)->y > (pra)->pr->pr_size.y) \
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(size)->y = (pra)->pr->pr_size.y - (pra)->pos.y; \
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}
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pr_clip(dstp, srcp)
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register struct pr_subregion *dstp;
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register struct pr_prpos *srcp;
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{
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if (srcp->pr) {
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pr_clip1(dstp, &dstp->size, srcp);
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pr_clip1(srcp, &dstp->size, dstp);
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} else
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pr_clip2(dstp, &dstp->size);
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}
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