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