from BlitOp.hpp:52
struct BlitOp
{
uint32_t operation;
const uint16_t* pSrc;
uint16_t* pDst;
uint16_t nSteps;
uint16_t nLoops;
uint16_t srcLoopStride;
uint16_t dstLoopStride;
colortype color;
uint8_t alpha;
};