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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #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,
- uint32_t 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);
- 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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