the format for the new surface
width of the new surface, (in device-space units)
height of the new surface (in device-space units)
a pointer to the newly allocated image surface. The caller owns the surface and should call cairo_surface_destroy() when done with it. This function always returns a valid pointer, but it will return a pointer to a "nil" surface if other is already in an error state or any other error occurs.
Create a new image surface that is as compatible as possible for uploading to and the use in conjunction with an existing surface. However, this surface can still be used like any normal image surface. Initially the surface contents are all 0 (transparent if contents have transparency, black otherwise.) Use cairo_surface_create_similar() if you don't need an image surface. Since 1.12