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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>
Memimage*
memlalloc(Memscreen *s, Rectangle screenr, Refreshfn refreshfn, void *refreshptr, u32int val)
{
Memlayer *l;
Memimage *n;
static Memimage *paint;
if(paint == nil){
paint = allocmemimage(Rect(0,0,1,1), RGBA32);
if(paint == nil)
return nil;
paint->flags |= Frepl;
paint->clipr = Rect(-0x3FFFFFF, -0x3FFFFFF, 0x3FFFFFF, 0x3FFFFFF);
}
n = allocmemimaged(screenr, s->image->chan, s->image->data, nil);
if(n == nil)
return nil;
l = malloc(sizeof(Memlayer));
if(l == nil){
free(n);
return nil;
}
l->screen = s;
if(refreshfn)
l->save = nil;
else{
l->save = allocmemimage(screenr, s->image->chan);
if(l->save == nil){
free(l);
free(n);
return nil;
}
/* allocmemimage doesn't initialize memory; this paints save area */
if(val != DNofill)
memfillcolor(l->save, val);
}
l->refreshfn = refreshfn;
l->refreshptr = nil; /* don't set it until we're done */
l->screenr = screenr;
l->delta = Pt(0,0);
n->data->ref++;
n->zero = s->image->zero;
n->width = s->image->width;
n->layer = l;
/* start with new window behind all existing ones */
l->front = s->rearmost;
l->rear = nil;
if(s->rearmost)
s->rearmost->layer->rear = n;
s->rearmost = n;
if(s->frontmost == nil)
s->frontmost = n;
l->clear = 0;
/* now pull new window to front */
_memltofrontfill(n, val != DNofill);
l->refreshptr = refreshptr;
/*
* paint with requested color; previously exposed areas are already right
* if this window has backing store, but just painting the whole thing is simplest.
*/
if(val != DNofill){
memsetchan(paint, n->chan);
memfillcolor(paint, val);
memdraw(n, n->r, paint, n->r.min, nil, n->r.min, S);
}
return n;
}
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