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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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/*
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* Hide puts that portion of screenr now on the screen into the window's save area.
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* Expose puts that portion of screenr now in the save area onto the screen.
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*
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* Hide and Expose both require that the layer structures in the screen
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* match the geometry they are being asked to update, that is, they update the
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* save area (hide) or screen (expose) based on what those structures tell them.
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* This means they must be called at the correct time during window shuffles.
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*/
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static
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void
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lhideop(Memimage *src, Rectangle screenr, Rectangle clipr, void *etc, int insave)
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{
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Rectangle r;
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Memlayer *l;
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USED(clipr.min.x);
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USED(insave);
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l = etc;
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if(src != l->save){ /* do nothing if src is already in save area */
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r = rectsubpt(screenr, l->delta);
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memdraw(l->save, r, src, screenr.min, nil, screenr.min, S);
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}
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}
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void
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memlhide(Memimage *i, Rectangle screenr)
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{
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if(i->layer->save == nil)
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return;
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if(rectclip(&screenr, i->layer->screen->image->r) == 0)
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return;
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_memlayerop(lhideop, i, screenr, screenr, i->layer);
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}
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static
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void
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lexposeop(Memimage *dst, Rectangle screenr, Rectangle clipr, void *etc, int insave)
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{
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Memlayer *l;
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Rectangle r;
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USED(clipr.min.x);
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if(insave) /* if dst is save area, don't bother */
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return;
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l = etc;
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r = rectsubpt(screenr, l->delta);
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if(l->save)
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memdraw(dst, screenr, l->save, r.min, nil, r.min, S);
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else
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l->refreshfn(dst, r, l->refreshptr);
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}
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void
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memlexpose(Memimage *i, Rectangle screenr)
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{
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if(rectclip(&screenr, i->layer->screen->image->r) == 0)
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return;
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_memlayerop(lexposeop, i, screenr, screenr, i->layer);
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}
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