Test program updated to create a blank background surface
of the appropriate type. This program needs to be improved
by loading a real YUV image so that the algorithm can be
confirmed.
# operation flags
OP_ASSIGN = 'OP_ASSIGN'
OP_DELETE = 'OP_DELETE'
OP_APPLY = 'OP_APPLY'
SC_LOCAL = 1
SC_GLOBAL = 2
SC_FREE = 3
SC_CELL = 4
SC_UNKNOWN = 5
CO_OPTIMIZED = 0x0001
CO_NEWLOCALS = 0x0002
CO_VARARGS = 0x0004
CO_VARKEYWORDS = 0x0008
CO_NESTED = 0x0010
CO_GENERATOR = 0x0020
CO_GENERATOR_ALLOWED = 0
CO_FUTURE_DIVISION = 0x2000
CO_FUTURE_ABSIMPORT = 0x4000
CO_FUTURE_WITH_STATEMENT = 0x8000
CO_FUTURE_PRINT_FUNCTION = 0x10000