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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/libdraw/rectclip.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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int
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rectclip(Rectangle *rp, Rectangle b)		/* first by reference, second by value */
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{
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	Rectangle *bp = &b;
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	/*
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	 * Expand rectXrect() in line for speed
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	 */
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	if((rp->min.x<bp->max.x && bp->min.x<rp->max.x &&
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	    rp->min.y<bp->max.y && bp->min.y<rp->max.y)==0)
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		return 0;
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	/* They must overlap */
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	if(rp->min.x < bp->min.x)
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		rp->min.x = bp->min.x;
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	if(rp->min.y < bp->min.y)
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		rp->min.y = bp->min.y;
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	if(rp->max.x > bp->max.x)
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		rp->max.x = bp->max.x;
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	if(rp->max.y > bp->max.y)
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		rp->max.y = bp->max.y;
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	return 1;
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}