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 Memimage*
 8 76193d7c 2003-09-30 devnull memlalloc(Memscreen *s, Rectangle screenr, Refreshfn refreshfn, void *refreshptr, u32int val)
 9 76193d7c 2003-09-30 devnull {
10 76193d7c 2003-09-30 devnull 	Memlayer *l;
11 76193d7c 2003-09-30 devnull 	Memimage *n;
12 76193d7c 2003-09-30 devnull 	static Memimage *paint;
13 76193d7c 2003-09-30 devnull 
14 76193d7c 2003-09-30 devnull 	if(paint == nil){
15 76193d7c 2003-09-30 devnull 		paint = allocmemimage(Rect(0,0,1,1), RGBA32);
16 76193d7c 2003-09-30 devnull 		if(paint == nil)
17 76193d7c 2003-09-30 devnull 			return nil;
18 76193d7c 2003-09-30 devnull 		paint->flags |= Frepl;
19 76193d7c 2003-09-30 devnull 		paint->clipr = Rect(-0x3FFFFFF, -0x3FFFFFF, 0x3FFFFFF, 0x3FFFFFF);
20 76193d7c 2003-09-30 devnull 	}
21 76193d7c 2003-09-30 devnull 
22 76193d7c 2003-09-30 devnull 	n = allocmemimaged(screenr, s->image->chan, s->image->data, nil);
23 76193d7c 2003-09-30 devnull 	if(n == nil)
24 76193d7c 2003-09-30 devnull 		return nil;
25 76193d7c 2003-09-30 devnull 	l = malloc(sizeof(Memlayer));
26 76193d7c 2003-09-30 devnull 	if(l == nil){
27 76193d7c 2003-09-30 devnull 		free(n);
28 76193d7c 2003-09-30 devnull 		return nil;
29 76193d7c 2003-09-30 devnull 	}
30 76193d7c 2003-09-30 devnull 
31 76193d7c 2003-09-30 devnull 	l->screen = s;
32 76193d7c 2003-09-30 devnull 	if(refreshfn)
33 76193d7c 2003-09-30 devnull 		l->save = nil;
34 76193d7c 2003-09-30 devnull 	else{
35 76193d7c 2003-09-30 devnull 		l->save = allocmemimage(screenr, s->image->chan);
36 76193d7c 2003-09-30 devnull 		if(l->save == nil){
37 76193d7c 2003-09-30 devnull 			free(l);
38 76193d7c 2003-09-30 devnull 			free(n);
39 76193d7c 2003-09-30 devnull 			return nil;
40 76193d7c 2003-09-30 devnull 		}
41 76193d7c 2003-09-30 devnull 		/* allocmemimage doesn't initialize memory; this paints save area */
42 76193d7c 2003-09-30 devnull 		if(val != DNofill)
43 76193d7c 2003-09-30 devnull 			memfillcolor(l->save, val);
44 76193d7c 2003-09-30 devnull 	}
45 76193d7c 2003-09-30 devnull 	l->refreshfn = refreshfn;
46 76193d7c 2003-09-30 devnull 	l->refreshptr = nil;	/* don't set it until we're done */
47 76193d7c 2003-09-30 devnull 	l->screenr = screenr;
48 76193d7c 2003-09-30 devnull 	l->delta = Pt(0,0);
49 76193d7c 2003-09-30 devnull 
50 76193d7c 2003-09-30 devnull 	n->data->ref++;
51 76193d7c 2003-09-30 devnull 	n->zero = s->image->zero;
52 76193d7c 2003-09-30 devnull 	n->width = s->image->width;
53 76193d7c 2003-09-30 devnull 	n->layer = l;
54 76193d7c 2003-09-30 devnull 
55 76193d7c 2003-09-30 devnull 	/* start with new window behind all existing ones */
56 76193d7c 2003-09-30 devnull 	l->front = s->rearmost;
57 76193d7c 2003-09-30 devnull 	l->rear = nil;
58 76193d7c 2003-09-30 devnull 	if(s->rearmost)
59 76193d7c 2003-09-30 devnull 		s->rearmost->layer->rear = n;
60 76193d7c 2003-09-30 devnull 	s->rearmost = n;
61 76193d7c 2003-09-30 devnull 	if(s->frontmost == nil)
62 76193d7c 2003-09-30 devnull 		s->frontmost = n;
63 76193d7c 2003-09-30 devnull 	l->clear = 0;
64 76193d7c 2003-09-30 devnull 
65 76193d7c 2003-09-30 devnull 	/* now pull new window to front */
66 76193d7c 2003-09-30 devnull 	_memltofrontfill(n, val != DNofill);
67 76193d7c 2003-09-30 devnull 	l->refreshptr = refreshptr;
68 76193d7c 2003-09-30 devnull 
69 76193d7c 2003-09-30 devnull 	/*
70 76193d7c 2003-09-30 devnull 	 * paint with requested color; previously exposed areas are already right
71 76193d7c 2003-09-30 devnull 	 * if this window has backing store, but just painting the whole thing is simplest.
72 76193d7c 2003-09-30 devnull 	 */
73 76193d7c 2003-09-30 devnull 	if(val != DNofill){
74 76193d7c 2003-09-30 devnull 		memsetchan(paint, n->chan);
75 76193d7c 2003-09-30 devnull 		memfillcolor(paint, val);
76 76193d7c 2003-09-30 devnull 		memdraw(n, n->r, paint, n->r.min, nil, n->r.min, S);
77 76193d7c 2003-09-30 devnull 	}
78 76193d7c 2003-09-30 devnull 	return n;
79 76193d7c 2003-09-30 devnull }