void
JB2Dict::JB2Codec::Decode::code_bitmap_directly(
GBitmap &bm,const int dw, int dy,
unsigned char *up2, unsigned char *up1, unsigned char *up0 )
{
ZPCodec &zp=*gzp;
// iterate on rows (decoding)
while (dy >= 0)
{
int context=get_direct_context(up2, up1, up0, 0);
for(int dx=0;dx < dw;)
{
int n = zp.decoder(bitdist[context]);
up0[dx++] = n;
context=shift_direct_context(context, n, up2, up1, up0, dx);
}
// next row
dy -= 1;
up2 = up1;
up1 = up0;
up0 = bm[dy];
}
#ifndef NDEBUG
bm.check_border();
#endif
}
void
JB2Dict::JB2Codec::Encode::code_bitmap_directly(
GBitmap &bm,const int dw, int dy,
unsigned char *up2, unsigned char *up1, unsigned char *up0 )
{
ZPCodec &zp=*gzp;
// iterate on rows (encoding)
while (dy >= 0)
{
int context=get_direct_context(up2, up1, up0, 0);
for (int dx=0;dx < dw;)
{
int n = up0[dx++];
zp.encoder(n, bitdist[context]);
context=shift_direct_context(context, n, up2, up1, up0, dx);
}
// next row
dy -= 1;
up2 = up1;
up1 = up0;
up0 = bm[dy];
}
}