Can you get a AEGP_WorldH from a PF_EffectWorld*?

Hey guys.  In my import plugin's DrawSparseFrame, I'm trying to figure out the PixelFormat of the PF_EffectWorld* passed in.  My prototype looks like this:

static A_Err

My_DrawSparseFrame(

    AEIO_BasicData *basic_dataP,

    AEIO_InSpecH specH,

    const AEIO_DrawSparseFramePB *sparse_framePPB,

    PF_EffectWorld *wP,

    AEIO_DrawingFlags *draw_flagsP);

So how do you get the pixel format?  From the wP, you can get width/height/pitch/base address.  I'd like to use the WorldSuite3 but all the calls need an AEGP_WorldH.  So is there some way to get the AEGP_WorldH from the passed in PF_EffectWorld*, or is there another way to get the pixel format without using older, deprecated suites?