fClippedAlphaMask
#define fClippedAlphaMask fInternal.fClippedAlphaMask
fClippedAlphaMask = state->GetAlphaMask()->Mask();
fClippedAlphaMask = NULL;
fClippedAlphaMask(NULL),
agg::clipped_alpha_mask* fClippedAlphaMask;
fAlphaMask = aggInterface.fClippedAlphaMask;