protected virtual void CodeBitmapByCrossCoding(IBitmap bm, IBitmap cbm, int libno)
{
// Bitmap cbm=new Bitmap();
// synchronized(xcbm)
// {
// cbm.init(xcbm);
// }
lock (bm)
{
int cw = cbm.Width;
int dw = bm.Width;
int dh = bm.Height;
Rectangle lmatch = (Rectangle)_LibInfo[libno];
//int xd2c = ((1 + (dw / 2)) - dw) - ((((1 + lmatch.Left) - lmatch.Right) / 2) - lmatch.Left);
//int yd2c = ((1 + (dh / 2)) - dh) - ((((1 + lmatch.Top) - lmatch.Bottom) / 2) - lmatch.Top);
int xd2c = ((1 + (dw >> 1)) - dw) - ((((1 + lmatch.Left) - lmatch.Right) >> 1) - lmatch.Left);
int yd2c = ((1 + (dh >> 1)) - dh) - ((((1 + lmatch.Top) - lmatch.Bottom) >> 1) - lmatch.Top);
bm.MinimumBorder = 2;
cbm.MinimumBorder = 2 - xd2c;
cbm.MinimumBorder = (2 + dw + xd2c) - cw;
int dy = dh - 1;
int cy = dy + yd2c;
CodeBitmapByCrossCoding(bm, cbm, xd2c, dw, dy, cy, bm.RowOffset(dy + 1), bm.RowOffset(dy),
cbm.RowOffset(cy + 1) + xd2c, cbm.RowOffset(cy) + xd2c,
cbm.RowOffset(cy - 1) + xd2c);
}
}
protected virtual void CodeBitmapDirectly(IBitmap bm)
{
lock (bm)
{
bm.MinimumBorder = 3;
int dy = bm.Height - 1;
CodeBitmapDirectly(bm, bm.Width, dy, bm.RowOffset(dy + 2), bm.RowOffset(dy + 1), bm.RowOffset(dy));
}
}
protected override void CodeBitmapDirectly(IBitmap bm, int dw, int dy, int up2, int up1, int up0)
{
while (dy >= 0)
{
int context = GetDirectContext(bm, up2, up1, up0, 0);
for (int dx = 0; dx < dw;)
{
int n = CodeBit(false, _BitDist, context);
bm.SetByteAt(up0 + dx++, (sbyte)n);
context = ShiftDirectContext(bm, context, n, up2, up1, up0, dx);
}
up2 = up1;
up1 = up0;
up0 = bm.RowOffset(--dy);
}
}
protected override void CodeBitmapByCrossCoding(IBitmap bm, IBitmap cbm, int xd2c, int dw, int dy,
int cy, int up1, int up0, int xup1, int xup0,
int xdn1)
{
while (dy >= 0)
{
int context = GetCrossContext(bm, cbm, up1, up0, xup1, xup0, xdn1, 0);
for (int dx = 0; dx < dw;)
{
int n = CodeBit(false, _CBitDist, context);
bm.SetByteAt(up0 + dx++, (sbyte)n);
context = ShiftCrossContext(bm, cbm, context, n, up1, up0, xup1, xup0, xdn1, dx);
}
up1 = up0;
up0 = bm.RowOffset(--dy);
xup1 = xup0;
xup0 = xdn1;
xdn1 = cbm.RowOffset((--cy) - 1) + xd2c;
}
}