Function blockcopy

source/src/worldlight.cpp:358–366

// utility functions also used by editing code

block *blockcopy(const block &s)
{
    block *b = (block *)new uchar[sizeof(block)+s.xs*s.ys*sizeof(sqr)];
    *b = s;
    sqr *q = (sqr *)(b+1), *r = S(s.x,s.y);
    size_t bs = s.xs * sizeof(sqr);
    loopirev(s.ys) { memcpy(q, r, bs); q += s.xs; r += ssize; }
    return b;
}

void blocktexusage(const block &b, uchar *used)
{