gdImagePngToSink  631 libgd/gd.h     void gdImagePngToSink(gdImagePtr im, gdSinkPtr out);
gdImagePngToSink   11 libgd/gd_ss.c  extern void gdImagePngToSink (gdImagePtr im, gdSinkPtr out);
gdImagePngToSink  187 libgd/gdtest.c   gdImagePngToSink (im, &imgsnk);