double ZopfliCalculateBlockSizeAutoType(const ZopfliLZ77Store* lz77,
size_t lstart, size_t lend) {
double uncompressedcost = ZopfliCalculateBlockSize(lz77, lstart, lend, 0);
/* Don't do the expensive fixed cost calculation for larger blocks that are
unlikely to use it. */
double fixedcost = (lz77->size > 1000) ?
uncompressedcost : ZopfliCalculateBlockSize(lz77, lstart, lend, 1);
double dyncost = ZopfliCalculateBlockSize(lz77, lstart, lend, 2);
return (uncompressedcost < fixedcost && uncompressedcost < dyncost)
? uncompressedcost
: (fixedcost < dyncost ? fixedcost : dyncost);
}
/*
Returns estimated cost of a block in bits. It includes the size to encode the
tree and the size to encode all literal, length and distance symbols and their
extra bits.
litlens: lz77 lit/lengths
dists: ll77 distances
lstart: start of block
lend: end of block (not inclusive)
*/
static double EstimateCost(const unsigned short* litlens,
const unsigned short* dists,
size_t lstart, size_t lend, int ohh) {
return ZopfliCalculateBlockSize(litlens, dists, lstart, lend, 2, ohh);
}
