void
JB2Dict::JB2Codec::code_bitmap_by_cross_coding (GBitmap &bm, GP<GBitmap> &cbm, const int libno)
{
// Make sure bitmaps will not be disturbed
GP<GBitmap> copycbm=GBitmap::create();
if (cbm->monitor())
{
// Perform a copy when the bitmap is explicitely shared
GMonitorLock lock2(cbm->monitor());
copycbm->init(*cbm);
cbm = copycbm;
}
GMonitorLock lock1(bm.monitor());
// Center bitmaps
const int cw = cbm->columns();
const int dw = bm.columns();
const int dh = bm.rows();
const LibRect &l = libinfo[libno];
const int xd2c = (dw/2 - dw + 1) - ((l.right - l.left + 1)/2 - l.right);
const int yd2c = (dh/2 - dh + 1) - ((l.top - l.bottom + 1)/2 - l.top);
// Ensure borders are adequate
bm.minborder(2);
cbm->minborder(2-xd2c);
cbm->minborder(2+dw+xd2c-cw);
// Initialize row pointers
const int dy = dh - 1;
const int cy = dy + yd2c;
#ifndef NDEBUG
bm.check_border();
cbm->check_border();
#endif
code_bitmap_by_cross_coding (bm,*cbm, xd2c, dw, dy, cy, bm[dy+1], bm[dy],
(*cbm)[cy+1] + xd2c, (*cbm)[cy ] + xd2c, (*cbm)[cy-1] + xd2c);
}
