1 76193d7c 2003-09-30 devnull #include <u.h>
  2 76193d7c 2003-09-30 devnull #include <libc.h>
  3 76193d7c 2003-09-30 devnull #include <draw.h>
  4 76193d7c 2003-09-30 devnull #include <memdraw.h>
  5 76193d7c 2003-09-30 devnull #include <memlayer.h>
  6 76193d7c 2003-09-30 devnull 
  7 76193d7c 2003-09-30 devnull struct Lline
  8 76193d7c 2003-09-30 devnull {
  9 76193d7c 2003-09-30 devnull 	Point			p0;
 10 76193d7c 2003-09-30 devnull 	Point			p1;
 11 76193d7c 2003-09-30 devnull 	Point			delta;
 12 76193d7c 2003-09-30 devnull 	int			end0;
 13 76193d7c 2003-09-30 devnull 	int			end1;
 14 76193d7c 2003-09-30 devnull 	int			radius;
 15 76193d7c 2003-09-30 devnull 	Point			sp;
 16 76193d7c 2003-09-30 devnull 	Memlayer		*dstlayer;
 17 76193d7c 2003-09-30 devnull 	Memimage	*src;
 18 76193d7c 2003-09-30 devnull 	int			op;
 19 76193d7c 2003-09-30 devnull };
 20 76193d7c 2003-09-30 devnull 
 21 76193d7c 2003-09-30 devnull static void llineop(Memimage*, Rectangle, Rectangle, void*, int);
 22 76193d7c 2003-09-30 devnull 
 23 76193d7c 2003-09-30 devnull static
 24 76193d7c 2003-09-30 devnull void
 25 76193d7c 2003-09-30 devnull _memline(Memimage *dst, Point p0, Point p1, int end0, int end1, int radius, Memimage *src, Point sp, Rectangle clipr, int op)
 26 76193d7c 2003-09-30 devnull {
 27 76193d7c 2003-09-30 devnull 	Rectangle r;
 28 76193d7c 2003-09-30 devnull 	struct Lline ll;
 29 76193d7c 2003-09-30 devnull 	Point d;
 30 76193d7c 2003-09-30 devnull 	int srcclipped;
 31 76193d7c 2003-09-30 devnull 	Memlayer *dl;
 32 76193d7c 2003-09-30 devnull 
 33 76193d7c 2003-09-30 devnull 	if(radius < 0)
 34 76193d7c 2003-09-30 devnull 		return;
 35 76193d7c 2003-09-30 devnull 	if(src->layer)	/* can't draw line with layered source */
 36 76193d7c 2003-09-30 devnull 		return;
 37 76193d7c 2003-09-30 devnull 	srcclipped = 0;
 38 76193d7c 2003-09-30 devnull 
 39 76193d7c 2003-09-30 devnull    Top:
 40 76193d7c 2003-09-30 devnull 	dl = dst->layer;
 41 76193d7c 2003-09-30 devnull 	if(dl == nil){
 42 76193d7c 2003-09-30 devnull 		_memimageline(dst, p0, p1, end0, end1, radius, src, sp, clipr, op);
 43 76193d7c 2003-09-30 devnull 		return;
 44 76193d7c 2003-09-30 devnull 	}
 45 76193d7c 2003-09-30 devnull 	if(!srcclipped){
 46 76193d7c 2003-09-30 devnull 		d = subpt(sp, p0);
 47 76193d7c 2003-09-30 devnull 		if(rectclip(&clipr, rectsubpt(src->clipr, d)) == 0)
 48 76193d7c 2003-09-30 devnull 			return;
 49 76193d7c 2003-09-30 devnull 		if((src->flags&Frepl)==0 && rectclip(&clipr, rectsubpt(src->r, d))==0)
 50 76193d7c 2003-09-30 devnull 			return;
 51 76193d7c 2003-09-30 devnull 		srcclipped = 1;
 52 76193d7c 2003-09-30 devnull 	}
 53 76193d7c 2003-09-30 devnull 
 54 76193d7c 2003-09-30 devnull 	/* dst is known to be a layer */
 55 76193d7c 2003-09-30 devnull 	p0.x += dl->delta.x;
 56 76193d7c 2003-09-30 devnull 	p0.y += dl->delta.y;
 57 76193d7c 2003-09-30 devnull 	p1.x += dl->delta.x;
 58 76193d7c 2003-09-30 devnull 	p1.y += dl->delta.y;
 59 76193d7c 2003-09-30 devnull 	clipr.min.x += dl->delta.x;
 60 76193d7c 2003-09-30 devnull 	clipr.min.y += dl->delta.y;
 61 76193d7c 2003-09-30 devnull 	clipr.max.x += dl->delta.x;
 62 76193d7c 2003-09-30 devnull 	clipr.max.y += dl->delta.y;
 63 76193d7c 2003-09-30 devnull 	if(dl->clear){
 64 76193d7c 2003-09-30 devnull 		dst = dst->layer->screen->image;
 65 76193d7c 2003-09-30 devnull 		goto Top;
 66 76193d7c 2003-09-30 devnull 	}
 67 76193d7c 2003-09-30 devnull 
 68 76193d7c 2003-09-30 devnull 	/* XXX */
 69 76193d7c 2003-09-30 devnull 	/* this is not the correct set of tests */
 70 cbeb0b26 2006-04-01 devnull /*	if(log2[dst->depth] != log2[src->depth] || log2[dst->depth]!=3) */
 71 cbeb0b26 2006-04-01 devnull /*		return; */
 72 76193d7c 2003-09-30 devnull 
 73 76193d7c 2003-09-30 devnull 	/* can't use sutherland-cohen clipping because lines are wide */
 74 76193d7c 2003-09-30 devnull 	r = memlinebbox(p0, p1, end0, end1, radius);
 75 76193d7c 2003-09-30 devnull 	/*
 76 76193d7c 2003-09-30 devnull 	 * r is now a bounding box for the line;
 77 76193d7c 2003-09-30 devnull 	 * use it as a clipping rectangle for subdivision
 78 76193d7c 2003-09-30 devnull 	 */
 79 76193d7c 2003-09-30 devnull 	if(rectclip(&r, clipr) == 0)
 80 76193d7c 2003-09-30 devnull 		return;
 81 76193d7c 2003-09-30 devnull 	ll.p0 = p0;
 82 76193d7c 2003-09-30 devnull 	ll.p1 = p1;
 83 76193d7c 2003-09-30 devnull 	ll.end0 = end0;
 84 76193d7c 2003-09-30 devnull 	ll.end1 = end1;
 85 76193d7c 2003-09-30 devnull 	ll.sp = sp;
 86 76193d7c 2003-09-30 devnull 	ll.dstlayer = dst->layer;
 87 76193d7c 2003-09-30 devnull 	ll.src = src;
 88 76193d7c 2003-09-30 devnull 	ll.radius = radius;
 89 76193d7c 2003-09-30 devnull 	ll.delta = dl->delta;
 90 76193d7c 2003-09-30 devnull 	ll.op = op;
 91 76193d7c 2003-09-30 devnull 	_memlayerop(llineop, dst, r, r, &ll);
 92 76193d7c 2003-09-30 devnull }
 93 76193d7c 2003-09-30 devnull 
 94 76193d7c 2003-09-30 devnull static
 95 76193d7c 2003-09-30 devnull void
 96 76193d7c 2003-09-30 devnull llineop(Memimage *dst, Rectangle screenr, Rectangle clipr, void *etc, int insave)
 97 76193d7c 2003-09-30 devnull {
 98 76193d7c 2003-09-30 devnull 	struct Lline *ll;
 99 76193d7c 2003-09-30 devnull 	Point p0, p1;
100 76193d7c 2003-09-30 devnull 
101 76193d7c 2003-09-30 devnull 	USED(screenr.min.x);
102 76193d7c 2003-09-30 devnull 	ll = etc;
103 76193d7c 2003-09-30 devnull 	if(insave && ll->dstlayer->save==nil)
104 76193d7c 2003-09-30 devnull 		return;
105 76193d7c 2003-09-30 devnull 	if(!rectclip(&clipr, screenr))
106 76193d7c 2003-09-30 devnull 		return;
107 76193d7c 2003-09-30 devnull 	if(insave){
108 76193d7c 2003-09-30 devnull 		p0 = subpt(ll->p0, ll->delta);
109 76193d7c 2003-09-30 devnull 		p1 = subpt(ll->p1, ll->delta);
110 76193d7c 2003-09-30 devnull 		clipr = rectsubpt(clipr, ll->delta);
111 76193d7c 2003-09-30 devnull 	}else{
112 76193d7c 2003-09-30 devnull 		p0 = ll->p0;
113 76193d7c 2003-09-30 devnull 		p1 = ll->p1;
114 76193d7c 2003-09-30 devnull 	}
115 76193d7c 2003-09-30 devnull 	_memline(dst, p0, p1, ll->end0, ll->end1, ll->radius, ll->src, ll->sp, clipr, ll->op);
116 76193d7c 2003-09-30 devnull }
117 76193d7c 2003-09-30 devnull 
118 76193d7c 2003-09-30 devnull void
119 76193d7c 2003-09-30 devnull memline(Memimage *dst, Point p0, Point p1, int end0, int end1, int radius, Memimage *src, Point sp, int op)
120 76193d7c 2003-09-30 devnull {
121 76193d7c 2003-09-30 devnull 	_memline(dst, p0, p1, end0, end1, radius, src, sp, dst->clipr, op);
122 76193d7c 2003-09-30 devnull }