from BlitOp.hpp:30
enum BlitOperations
{
BLIT_OP_COPY = 1 << 0,
BLIT_OP_FILL = 1 << 1,
BLIT_OP_COPY_WITH_ALPHA = 1 << 2,
BLIT_OP_FILL_WITH_ALPHA = 1 << 3,
BLIT_OP_COPY_WITH_TRANSPARENT_PIXELS = 1 << 4,
BLIT_OP_COPY_ARGB8888 = 1 << 5,
BLIT_OP_COPY_ARGB8888_WITH_ALPHA = 1 << 6,
BLIT_OP_COPY_A4 = 1 << 7,
BLIT_OP_COPY_A8 = 1 << 8
};