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Plan 9 NeXT

#include <u.h>
#include <libc.h>
#include <libg.h>
#include <gnot.h>

void
gbitbltclip(void *vp)
{
	int dx, dy;
	int i;
	struct{
		GBitmap *dm;
		Point p;
		GBitmap *sm;
		Rectangle r;
		Fcode f;
	}*bp;

	bp = vp;
	dx = Dx(bp->r);
	dy = Dy(bp->r);
	if(bp->p.x < bp->dm->clipr.min.x){
		i = bp->dm->clipr.min.x-bp->p.x;
		bp->r.min.x += i;
		bp->p.x += i;
		dx -= i;
	}
	if(bp->p.y < bp->dm->clipr.min.y){
		i = bp->dm->clipr.min.y-bp->p.y;
		bp->r.min.y += i;
		bp->p.y += i;
		dy -= i;
	}
	if(bp->p.x+dx > bp->dm->clipr.max.x)
		bp->r.max.x -= bp->p.x+dx-bp->dm->clipr.max.x;
	if(bp->p.y+dy > bp->dm->clipr.max.y)
		bp->r.max.y -= bp->p.y+dy-bp->dm->clipr.max.y;
	if(bp->r.min.x < bp->sm->clipr.min.x){
		i = bp->sm->clipr.min.x-bp->r.min.x;
		bp->p.x += i;
		bp->r.min.x += i;
	}
	if(bp->r.min.y < bp->sm->clipr.min.y){
		i = bp->sm->clipr.min.y-bp->r.min.y;
		bp->p.y += i;
		bp->r.min.y += i;
	}
	if(bp->r.max.x > bp->sm->clipr.max.x)
		bp->r.max.x = bp->sm->clipr.max.x;
	if(bp->r.max.y > bp->sm->clipr.max.y)
		bp->r.max.y = bp->sm->clipr.max.y;
}

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