Lists all XWD tag identifiers.

Values:

IGMDTAG_ID_XWD_FORMAT	XWD metadata format identifier.
IGMDTAG_ID_XWD_HEADER_SIZE	Header size. R/O.
IGMDTAG_ID_XWD_FILE_VERSION	File version. R/O.
IGMDTAG_ID_XWD_PIXMAP_FORMAT	Pixmap format. R/O.
IGMDTAG_ID_XWD_PIXMAP_DEPTH	Pixmap depth. R/O.
IGMDTAG_ID_XWD_PIXMAP_WIDTH	Pixmap width. R/O.
IGMDTAG_ID_XWD_PIXMAP_HEIGHT	Pixmap height. R/O.
IGMDTAG_ID_XWD_X_OFFSET	Bitmap x offset. R/W.
IGMDTAG_ID_XWD_BYTE_ORDER	Byte order. R/O.
IGMDTAG_ID_XWD_BITMAP_UNIT	Bitmap unit. R/O.
IGMDTAG_ID_XWD_BITMAP_BIT_ORDER	Bitmap bit order (MSBFirst, LSBFirst). R/O.
IGMDTAG_ID_XWD_BITMAP_PAD	Bitmap scanline pad. R/O.
IGMDTAG_ID_XWD_BITS_PER_PIXEL	Bits per pixel. R/O.
IGMDTAG_ID_XWD_BYTES_PER_LINE	Bytes per scanline. R/O.
IGMDTAG_ID_XWD_VISUAL_CLASS	Class of colormap. R/O.
IGMDTAG_ID_XWD_RED_MASK	Red mask. R/O.
IGMDTAG_ID_XWD_GREEN_MASK	Green mask. R/O.
IGMDTAG_ID_XWD_BLUE_MASK	Blue mask. R/O.
IGMDTAG_ID_XWD_BITS_PER_RGB	Log2 of distinct color values. R/O.
IGMDTAG_ID_XWD_NUMBER_OF_COLORS	Colors number. R/O.
IGMDTAG_ID_XWD_COLOR_MAP_ENTRIES	Color map entries. R/O.
IGMDTAG_ID_XWD_WINDOW_WIDTH	Window width. R/W.
IGMDTAG_ID_XWD_WINDOW_HEIGHT	Window height. R/W.
IGMDTAG_ID_XWD_WINDOW_X	Window upper left X coordinate. R/W.
IGMDTAG_ID_XWD_WINDOW_Y	Window upper left Y coordinate. R/W.
IGMDTAG_ID_XWD_WINDOW_BORDER_WIDTH	Window border width. R/W.