FMT_HAS_ALPHA
.flags = FMT_FLAGS_M2M | FMT_HAS_ALPHA,
unsigned int has_alpha = ctx->d_frame.fmt->flags & FMT_HAS_ALPHA;
.flags = FMT_FLAGS_M2M_OUT | FMT_HAS_ALPHA,
.flags = FMT_FLAGS_M2M_OUT | FMT_HAS_ALPHA,
if (!(frame->fmt->flags & FMT_HAS_ALPHA))