Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>

int
memunload(Memimage *src, Rectangle r, uchar *data, int n)
{
        Memimage *tmp;
        Memlayer *dl;
        Rectangle lr;
        int dx;

    Top:
        dl = src->layer;
        if(dl == nil)
                return unloadmemimage(src, r, data, n);

        /*
         * Convert to screen coordinates.
         */
        lr = r;
        r.min.x += dl->delta.x;
        r.min.y += dl->delta.y;
        r.max.x += dl->delta.x;
        r.max.y += dl->delta.y;
        dx = dl->delta.x&(7/src->depth);
        if(dl->clear && dx==0){
                src = dl->screen->image;
                goto Top;
        }

        /*
         * src is an obscured layer or data is unaligned
         */
        if(dl->save && dx==0){
                if(dl->refreshfn != nil)
                        return -1;      /* can't unload window if it's not Refbackup */
                if(n > 0)
                        memlhide(src, r);
                n = unloadmemimage(dl->save, lr, data, n);
                return n;
        }
        tmp = allocmemimage(lr, src->chan);
        if(tmp == nil)
                return -1;
        memdraw(tmp, lr, src, lr.min, nil, lr.min, S);
        n = unloadmemimage(tmp, lr, data, n);
        freememimage(tmp);
        return n;
}