ImageByteOrder, BitmapBitOrder, BitmapPad, BitmapUnit,
DisplayHeight, DisplayHeightMM, DisplayWidth,
DisplayWidthMM, XListPixmapFormats, XPixmapFormatValues −
image format functions and macros

XPixmapFormatValues *XListPixmapFormats(Display *display,
int *count_return); int ImageByteOrder(Display *display);
int BitmapBitOrder(Display *display); int BitmapPad(Display
*display); int BitmapUnit(Display *display); int
DisplayHeight(Display *display, int screen_number); int
DisplayHeightMM(Display *display, int screen_number); int
DisplayWidth(Display *display, int screen_number); int
DisplayWidthMM(Display *display, int screen_number);

display   Specifies the connection to the X server.

          Returns the number of pixmap formats that are
          supported by the display.

          Specifies the appropriate screen number on the
          host server.

The XListPixmapFormats function returns an array of
XPixmapFormatValues structures that describe the types of Z
format images supported by the specified display.  If
insufficient memory is available, XListPixmapFormats returns
NULL.  To free the allocated storage for the
XPixmapFormatValues structures, use

The ImageByteOrder macro specifies the required byte order
for images for each scanline unit in XY format (bitmap) or
for each pixel value in Z format.

The BitmapBitOrder macro returns LSBFirst or MSBFirst to
indicate whether the leftmost bit in the bitmap as displayed
on the screen is the least or most significant bit in the

The BitmapPad macro returns the number of bits that each
scanline must be padded.

The BitmapUnit macro returns the size of a bitmap’s scanline
unit in bits.

The DisplayHeight macro returns the height of the specified
screen in pixels.

The DisplayHeightMM macro returns the height of the
specified screen in millimeters.


The DisplayWidth macro returns the width of the screen in

The DisplayWidthMM macro returns the width of the specified
screen in millimeters.

The XPixmapFormatValues structure provides an interface to
the pixmap format information that is returned at the time
of a connection setup.  It contains: typedef struct {
        int depth;
        int bits_per_pixel;
        int scanline_pad; } XPixmapFormatValues;

AllPlanes(3), BlackPixelOfScreen(3), IsCursorKey(3),
Xlib − C Language X Interface