#cairo_raster_source_snapshot_func_t is the type of function which is
called when the pixel data needs to be preserved for later use
during printing. This pattern will be accessed again later, and it
is expected to provide the pixel data that was current at the time
of snapshotting.
#cairo_raster_source_snapshot_func_t is the type of function which is called when the pixel data needs to be preserved for later use during printing. This pattern will be accessed again later, and it is expected to provide the pixel data that was current at the time of snapshotting.