ImageByteOrder(3X11)RISC/os Reference Manual ImageByteOrder(3X11)



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

SYNTAX
     XPixmapFormatValues *XListPixmapFormats(display,
     count_return)
           Display *display;
           int *count_return;

     ImageByteOrder(display)

     BitmapBitOrder(display)

     BitmapPad(display)

     BitmapUnit(display)

     DisplayHeight(display, screen_number)

     DisplayHeightMM(display, screen_number)

     DisplayWidth(display, screen_number)

     DisplayWidthMM(display, screen_number)

ARGUMENTS
     display   Specifies the connection to the X server.

     count_return
               Returns the number of pixmap formats that are sup-
               ported by the display.

     screen_number
               Specifies the appropriate screen number on the
               host server.

DESCRIPTION
     The XListPixmapFormats function returns an array of XPixmap-
     FormatValues structures that describe the types of Z format
     images that are supported by the specified display.  If
     insufficient memory is available, XListPixmapFormats returns
     NULL.  To free the allocated storage for the XPixmapFormat-
     Values structures, use XFree.

     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.





                         Printed 1/24/91         Release 4 Page 1

ImageByteOrder(3X11)RISC/os Reference Manual ImageByteOrder(3X11)



     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
     unit.

     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 speci-
     fied screen in millimeters.

     The DisplayWidth macro returns the width of the screen in
     pixels.

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

STRUCTURES
     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;

SEE ALSO
     AllPlanes(3X11), BlackPixelOfScreen(3X11),
     IsCursorKey(3X11), XFree(3X11)
     Xlib - C Language X Interface


















Release 4 Page 2         Printed 1/24/91