65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.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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int
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memload(Memimage *dst, Rectangle r, uint8_t *data, int n, int iscompressed)
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{
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int (*loadfn)(Memimage*, Rectangle, uint8_t*, int);
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Memimage *tmp;
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Memlayer *dl;
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Rectangle lr;
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int dx;
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loadfn = loadmemimage;
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if(iscompressed)
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loadfn = cloadmemimage;
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Top:
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dl = dst->layer;
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if(dl == nil)
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return loadfn(dst, r, data, n);
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/*
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* Convert to screen coordinates.
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*/
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lr = r;
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r.min.x += dl->delta.x;
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r.min.y += dl->delta.y;
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r.max.x += dl->delta.x;
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r.max.y += dl->delta.y;
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dx = dl->delta.x&(7/dst->depth);
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if(dl->clear && dx==0){
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dst = dl->screen->image;
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goto Top;
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}
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/*
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* dst is an obscured layer or data is unaligned
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*/
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if(dl->save && dx==0){
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n = loadfn(dl->save, lr, data, n);
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if(n > 0)
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memlexpose(dst, r);
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return n;
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}
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tmp = allocmemimage(lr, dst->chan);
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if(tmp == nil)
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return -1;
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n = loadfn(tmp, lr, data, n);
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memdraw(dst, lr, tmp, lr.min, nil, lr.min, S);
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freememimage(tmp);
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return n;
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}
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