1 324891a5 2006-06-25 devnull #include <u.h>
 2 324891a5 2006-06-25 devnull #include <libc.h>
 3 324891a5 2006-06-25 devnull #include <draw.h>
 4 324891a5 2006-06-25 devnull #include <memdraw.h>
 5 324891a5 2006-06-25 devnull #include <memlayer.h>
 6 324891a5 2006-06-25 devnull 
 7 324891a5 2006-06-25 devnull Memimage*
 8 324891a5 2006-06-25 devnull memlalloc(Memscreen *s, Rectangle screenr, Refreshfn refreshfn, void *refreshptr, u32int val)
 9 324891a5 2006-06-25 devnull {
10 324891a5 2006-06-25 devnull 	Memlayer *l;
11 324891a5 2006-06-25 devnull 	Memimage *n;
12 324891a5 2006-06-25 devnull 	static Memimage *paint;
13 324891a5 2006-06-25 devnull 
14 324891a5 2006-06-25 devnull 	if(paint == nil){
15 324891a5 2006-06-25 devnull 		paint = allocmemimage(Rect(0,0,1,1), RGBA32);
16 324891a5 2006-06-25 devnull 		if(paint == nil)
17 324891a5 2006-06-25 devnull 			return nil;
18 324891a5 2006-06-25 devnull 		paint->flags |= Frepl;
19 324891a5 2006-06-25 devnull 		paint->clipr = Rect(-0x3FFFFFF, -0x3FFFFFF, 0x3FFFFFF, 0x3FFFFFF);
20 324891a5 2006-06-25 devnull 	}
21 324891a5 2006-06-25 devnull 
22 324891a5 2006-06-25 devnull 	n = allocmemimaged(screenr, s->image->chan, s->image->data, nil);
23 324891a5 2006-06-25 devnull 	if(n == nil)
24 324891a5 2006-06-25 devnull 		return nil;
25 324891a5 2006-06-25 devnull 	l = malloc(sizeof(Memlayer));
26 324891a5 2006-06-25 devnull 	if(l == nil){
27 324891a5 2006-06-25 devnull 		free(n);
28 324891a5 2006-06-25 devnull 		return nil;
29 324891a5 2006-06-25 devnull 	}
30 324891a5 2006-06-25 devnull 
31 324891a5 2006-06-25 devnull 	l->screen = s;
32 324891a5 2006-06-25 devnull 	if(refreshfn)
33 324891a5 2006-06-25 devnull 		l->save = nil;
34 324891a5 2006-06-25 devnull 	else{
35 324891a5 2006-06-25 devnull 		l->save = allocmemimage(screenr, s->image->chan);
36 324891a5 2006-06-25 devnull 		if(l->save == nil){
37 324891a5 2006-06-25 devnull 			free(l);
38 324891a5 2006-06-25 devnull 			free(n);
39 324891a5 2006-06-25 devnull 			return nil;
40 324891a5 2006-06-25 devnull 		}
41 324891a5 2006-06-25 devnull 		/* allocmemimage doesn't initialize memory; this paints save area */
42 324891a5 2006-06-25 devnull 		if(val != DNofill)
43 324891a5 2006-06-25 devnull 			memfillcolor(l->save, val);
44 324891a5 2006-06-25 devnull 	}
45 324891a5 2006-06-25 devnull 	l->refreshfn = refreshfn;
46 324891a5 2006-06-25 devnull 	l->refreshptr = nil;	/* don't set it until we're done */
47 324891a5 2006-06-25 devnull 	l->screenr = screenr;
48 324891a5 2006-06-25 devnull 	l->delta = Pt(0,0);
49 324891a5 2006-06-25 devnull 
50 324891a5 2006-06-25 devnull 	n->data->ref++;
51 324891a5 2006-06-25 devnull 	n->zero = s->image->zero;
52 324891a5 2006-06-25 devnull 	n->width = s->image->width;
53 324891a5 2006-06-25 devnull 	n->layer = l;
54 324891a5 2006-06-25 devnull 
55 324891a5 2006-06-25 devnull 	/* start with new window behind all existing ones */
56 324891a5 2006-06-25 devnull 	l->front = s->rearmost;
57 324891a5 2006-06-25 devnull 	l->rear = nil;
58 324891a5 2006-06-25 devnull 	if(s->rearmost)
59 324891a5 2006-06-25 devnull 		s->rearmost->layer->rear = n;
60 324891a5 2006-06-25 devnull 	s->rearmost = n;
61 324891a5 2006-06-25 devnull 	if(s->frontmost == nil)
62 324891a5 2006-06-25 devnull 		s->frontmost = n;
63 324891a5 2006-06-25 devnull 	l->clear = 0;
64 324891a5 2006-06-25 devnull 
65 324891a5 2006-06-25 devnull 	/* now pull new window to front */
66 324891a5 2006-06-25 devnull 	_memltofrontfill(n, val != DNofill);
67 324891a5 2006-06-25 devnull 	l->refreshptr = refreshptr;
68 324891a5 2006-06-25 devnull 
69 324891a5 2006-06-25 devnull 	/*
70 324891a5 2006-06-25 devnull 	 * paint with requested color; previously exposed areas are already right
71 324891a5 2006-06-25 devnull 	 * if this window has backing store, but just painting the whole thing is simplest.
72 324891a5 2006-06-25 devnull 	 */
73 324891a5 2006-06-25 devnull 	if(val != DNofill){
74 324891a5 2006-06-25 devnull 		memsetchan(paint, n->chan);
75 324891a5 2006-06-25 devnull 		memfillcolor(paint, val);
76 324891a5 2006-06-25 devnull 		memdraw(n, n->r, paint, n->r.min, nil, n->r.min, S);
77 324891a5 2006-06-25 devnull 	}
78 324891a5 2006-06-25 devnull 	return n;
79 324891a5 2006-06-25 devnull }