PNG_INFO_IDAT     521 3rdparty/libpng/png.c       info_ptr->valid &= ~PNG_INFO_IDAT;
PNG_INFO_IDAT    1294 3rdparty/libpng/pngread.c    info_ptr->valid |= PNG_INFO_IDAT;
PNG_INFO_IDAT    1202 3rdparty/libpng/pngset.c       info_ptr->valid |= PNG_INFO_IDAT;
PNG_INFO_IDAT    1658 3rdparty/libpng/pngwrite.c    if (info_ptr->valid & PNG_INFO_IDAT)