ref: 39347ab47dab6c556bb37ced7526bfcc8de4cf9b
dir: /libmemlayer/load.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>
int
memload(Memimage *dst, Rectangle r, uchar *data, int n, int iscompressed)
{
int (*loadfn)(Memimage*, Rectangle, uchar*, int);
Memimage *tmp;
Memlayer *dl;
Rectangle lr;
int dx;
loadfn = loadmemimage;
if(iscompressed)
loadfn = cloadmemimage;
Top:
dl = dst->layer;
if(dl == nil)
return loadfn(dst, 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/dst->depth);
if(dl->clear && dx==0){
dst = dl->screen->image;
goto Top;
}
/*
* dst is an obscured layer or data is unaligned
*/
if(dl->save && dx==0){
n = loadfn(dl->save, lr, data, n);
if(n > 0)
memlexpose(dst, r);
return n;
}
tmp = allocmemimage(lr, dst->chan);
if(tmp == nil)
return -1;
n = loadfn(tmp, lr, data, n);
memdraw(dst, lr, tmp, lr.min, nil, lr.min, S);
freememimage(tmp);
return n;
}