Use this function to perform a fast blit from the source surface to the this surface.
src is the a pointer to a Rect structure which represents the rectangle to be copied,
or null to copy the entire surface.
dst is a pointer to a Rect structure which represents the rectangle that is copied into.
null means, that the whole srfc is copied to (0|0).
Use this function to perform a fast blit from the source surface to the this surface. src is the a pointer to a Rect structure which represents the rectangle to be copied, or null to copy the entire surface. dst is a pointer to a Rect structure which represents the rectangle that is copied into. null means, that the whole srfc is copied to (0|0).