PNG_ZLIB_IN_USE   221 3rdparty/libpng/pngwutil.c    if (!(png_ptr->zlib_state & PNG_ZLIB_IN_USE))
PNG_ZLIB_IN_USE   297 3rdparty/libpng/pngwutil.c       png_ptr->zlib_state |= PNG_ZLIB_IN_USE;
PNG_ZLIB_IN_USE   310 3rdparty/libpng/pngwutil.c    if (png_ptr->zlib_state & PNG_ZLIB_IN_USE)
PNG_ZLIB_IN_USE   314 3rdparty/libpng/pngwutil.c       png_ptr->zlib_state &= ~PNG_ZLIB_IN_USE;