void * gdImageBmpPtr( gdImagePtr im, int * size, int compression )
void gdImageBmp( gdImagePtr im, FILE * outFile, int compression )
void gdImageBmpCtx( gdImagePtr im, gdIOCtxPtr out, int compression )
gdImagePtr gdImageCreateFromBmp( FILE * inFile )
gdImagePtr gdImageCreateFromBmpPtr( int size, void * data )
gdImagePtr gdImageCreateFromBmpCtx( gdIOCtxPtr infile )