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 #define	RECUR(a,b,c,d)	_layerop(fn, i, Rect(a.x, b.y, c.x, d.y), clipr, etc, front->layer->rear);
  8 76193d7c 2003-09-30 devnull 
  9 76193d7c 2003-09-30 devnull static void
 10 76193d7c 2003-09-30 devnull _layerop(
 11 76193d7c 2003-09-30 devnull 	void (*fn)(Memimage*, Rectangle, Rectangle, void*, int),
 12 76193d7c 2003-09-30 devnull 	Memimage *i,
 13 76193d7c 2003-09-30 devnull 	Rectangle r,
 14 76193d7c 2003-09-30 devnull 	Rectangle clipr,
 15 76193d7c 2003-09-30 devnull 	void *etc,
 16 76193d7c 2003-09-30 devnull 	Memimage *front)
 17 76193d7c 2003-09-30 devnull {
 18 76193d7c 2003-09-30 devnull 	Rectangle fr;
 19 76193d7c 2003-09-30 devnull 
 20 76193d7c 2003-09-30 devnull     Top:
 21 76193d7c 2003-09-30 devnull 	if(front == i){
 22 76193d7c 2003-09-30 devnull 		/* no one is in front of this part of window; use the screen */
 23 76193d7c 2003-09-30 devnull 		fn(i->layer->screen->image, r, clipr, etc, 0);
 24 76193d7c 2003-09-30 devnull 		return;
 25 76193d7c 2003-09-30 devnull 	}
 26 76193d7c 2003-09-30 devnull 	fr = front->layer->screenr;
 27 76193d7c 2003-09-30 devnull 	if(rectXrect(r, fr) == 0){
 28 76193d7c 2003-09-30 devnull 		/* r doesn't touch this window; continue on next rearmost */
 29 76193d7c 2003-09-30 devnull 		// assert(front && front->layer && front->layer->screen && front->layer->rear);
 30 76193d7c 2003-09-30 devnull 		front = front->layer->rear;
 31 76193d7c 2003-09-30 devnull 		goto Top;
 32 76193d7c 2003-09-30 devnull 	}
 33 76193d7c 2003-09-30 devnull 	if(fr.max.y < r.max.y){
 34 76193d7c 2003-09-30 devnull 		RECUR(r.min, fr.max, r.max, r.max);
 35 76193d7c 2003-09-30 devnull 		r.max.y = fr.max.y;
 36 76193d7c 2003-09-30 devnull 	}
 37 76193d7c 2003-09-30 devnull 	if(r.min.y < fr.min.y){
 38 76193d7c 2003-09-30 devnull 		RECUR(r.min, r.min, r.max, fr.min);
 39 76193d7c 2003-09-30 devnull 		r.min.y = fr.min.y;
 40 76193d7c 2003-09-30 devnull 	}
 41 76193d7c 2003-09-30 devnull 	if(fr.max.x < r.max.x){
 42 76193d7c 2003-09-30 devnull 		RECUR(fr.max, r.min, r.max, r.max);
 43 76193d7c 2003-09-30 devnull 		r.max.x = fr.max.x;
 44 76193d7c 2003-09-30 devnull 	}
 45 76193d7c 2003-09-30 devnull 	if(r.min.x < fr.min.x){
 46 76193d7c 2003-09-30 devnull 		RECUR(r.min, r.min, fr.min, r.max);
 47 76193d7c 2003-09-30 devnull 		r.min.x = fr.min.x;
 48 76193d7c 2003-09-30 devnull 	}
 49 76193d7c 2003-09-30 devnull 	/* r is covered by front, so put in save area */
 50 76193d7c 2003-09-30 devnull 	(*fn)(i->layer->save, r, clipr, etc, 1);
 51 76193d7c 2003-09-30 devnull }
 52 76193d7c 2003-09-30 devnull 
 53 76193d7c 2003-09-30 devnull /*
 54 76193d7c 2003-09-30 devnull  * Assumes incoming rectangle has already been clipped to i's logical r and clipr
 55 76193d7c 2003-09-30 devnull  */
 56 76193d7c 2003-09-30 devnull void
 57 76193d7c 2003-09-30 devnull _memlayerop(
 58 76193d7c 2003-09-30 devnull 	void (*fn)(Memimage*, Rectangle, Rectangle, void*, int),
 59 76193d7c 2003-09-30 devnull 	Memimage *i,
 60 76193d7c 2003-09-30 devnull 	Rectangle screenr,	/* clipped to window boundaries */
 61 76193d7c 2003-09-30 devnull 	Rectangle clipr,		/* clipped also to clipping rectangles of hierarchy */
 62 76193d7c 2003-09-30 devnull 	void *etc)
 63 76193d7c 2003-09-30 devnull {
 64 76193d7c 2003-09-30 devnull 	Memlayer *l;
 65 76193d7c 2003-09-30 devnull 	Rectangle r, scr;
 66 76193d7c 2003-09-30 devnull 
 67 76193d7c 2003-09-30 devnull 	l = i->layer;
 68 76193d7c 2003-09-30 devnull 	if(!rectclip(&screenr, l->screenr))
 69 76193d7c 2003-09-30 devnull 		return;
 70 76193d7c 2003-09-30 devnull 	if(l->clear){
 71 76193d7c 2003-09-30 devnull 		fn(l->screen->image, screenr, clipr, etc, 0);
 72 76193d7c 2003-09-30 devnull 		return;
 73 76193d7c 2003-09-30 devnull 	}
 74 76193d7c 2003-09-30 devnull 	r = screenr;
 75 76193d7c 2003-09-30 devnull 	scr = l->screen->image->clipr;
 76 76193d7c 2003-09-30 devnull 
 77 76193d7c 2003-09-30 devnull 	/*
 78 76193d7c 2003-09-30 devnull 	 * Do the piece on the screen
 79 76193d7c 2003-09-30 devnull 	 */
 80 76193d7c 2003-09-30 devnull 	if(rectclip(&screenr, scr))
 81 76193d7c 2003-09-30 devnull 		_layerop(fn, i, screenr, clipr, etc, l->screen->frontmost);
 82 76193d7c 2003-09-30 devnull 	if(rectinrect(r, scr))
 83 76193d7c 2003-09-30 devnull 		return;
 84 76193d7c 2003-09-30 devnull 
 85 76193d7c 2003-09-30 devnull 	/*
 86 76193d7c 2003-09-30 devnull 	 * Do the piece off the screen
 87 76193d7c 2003-09-30 devnull 	*/
 88 76193d7c 2003-09-30 devnull 	if(!rectXrect(r, scr)){
 89 76193d7c 2003-09-30 devnull 		/* completely offscreen; easy */
 90 76193d7c 2003-09-30 devnull 		fn(l->save, r, clipr, etc, 1);
 91 76193d7c 2003-09-30 devnull 		return;
 92 76193d7c 2003-09-30 devnull 	}
 93 76193d7c 2003-09-30 devnull 	if(r.min.y < scr.min.y){
 94 76193d7c 2003-09-30 devnull 		/* above screen */
 95 76193d7c 2003-09-30 devnull 		fn(l->save, Rect(r.min.x, r.min.y, r.max.x, scr.min.y), clipr, etc, 1);
 96 76193d7c 2003-09-30 devnull 		r.min.y = scr.min.y;
 97 76193d7c 2003-09-30 devnull 	}
 98 76193d7c 2003-09-30 devnull 	if(r.max.y > scr.max.y){
 99 76193d7c 2003-09-30 devnull 		/* below screen */
100 76193d7c 2003-09-30 devnull 		fn(l->save, Rect(r.min.x, scr.max.y, r.max.x, r.max.y), clipr, etc, 1);
101 76193d7c 2003-09-30 devnull 		r.max.y = scr.max.y;
102 76193d7c 2003-09-30 devnull 	}
103 76193d7c 2003-09-30 devnull 	if(r.min.x < scr.min.x){
104 76193d7c 2003-09-30 devnull 		/* left of screen */
105 76193d7c 2003-09-30 devnull 		fn(l->save, Rect(r.min.x, r.min.y, scr.min.x, r.max.y), clipr, etc, 1);
106 76193d7c 2003-09-30 devnull 		r.min.x = scr.min.x;
107 76193d7c 2003-09-30 devnull 	}
108 76193d7c 2003-09-30 devnull 	if(r.max.x > scr.max.x){
109 76193d7c 2003-09-30 devnull 		/* right of screen */
110 76193d7c 2003-09-30 devnull 		fn(l->save, Rect(scr.max.x, r.min.y, r.max.x, r.max.y), clipr, etc, 1);
111 76193d7c 2003-09-30 devnull 	}
112 76193d7c 2003-09-30 devnull }