After experimenting with a long running average at maxed out FPS and a variety of map sizes, 128 seems to actually be a good size to use if only drawing bits of world with stuff in it. 64 actually did even better in some situations, but significantly worse in others (lots of land, zoomed out).
#include "quacrc32.h"
#include "zlib.h"
QuaCrc32::QuaCrc32()
{
reset();
}
quint32 QuaCrc32::calculate(const QByteArray &data)
{
return crc32( crc32(0L, Z_NULL, 0), (const Bytef*)data.data(), data.size() );
}
void QuaCrc32::reset()
{
checksum = crc32(0L, Z_NULL, 0);
}
void QuaCrc32::update(const QByteArray &buf)
{
checksum = crc32( checksum, (const Bytef*)buf.data(), buf.size() );
}
quint32 QuaCrc32::value()
{
return checksum;
}