[Contents] [Index] [Next] [Previous]



XmGetPixmapByDepth - A pixmap caching function that generates a pixmap, stores it in a pixmap cache, and returns the pixmap


#include <Xm/Xm.h>
Pixmap XmGetPixmapByDepth (screen, image_name,foreground, background, depth)
      Screen  *screen;
      char    *image_name;
      Pixel   foreground;
      Pixel   background;
      int     depth;


XmGetPixmapByDepth uses the parameter data to perform a lookup in the pixmap cache to see if a pixmap has already been generated that matches the data. If one is found, a reference count is incremented and the pixmap is returned. Applications should use XmDestroyPixmap when the pixmap is no longer needed.

If a matching pixmap is not found, image_name is used to perform a lookup in the image cache. If an image is found, it is used to generate the pixmap, which is then cached and returned.

If an image is not found, image_name is used as a filename, and a search is made for an X10 or X11 bitmap file. If it is found, the file is read, converted into an image, and cached in the image cache. The image is then used to generate a pixmap, which is cached and returned.

If image_name has a leading slash (/), it specifies a full pathname, and XmGetPixmapByDepth opens the file as specified. Otherwise, image_name specifies a filename. In this case XmGetPixmapByDepth looks for the file along a search path specified by the XBMLANGPATH environment variable or by a default search path, which varies depending on whether or not the XAPPLRESDIR environment variable is set.

The XBMLANGPATH environment variable specifies a search path for X bitmap files. It can contain the substitution field %B, where the image_name argument to XmGetPixmapByDepth is substituted for %B. It can also contain the substitution fields accepted by XtResolvePathname. The substitution field %T is always mapped to bitmaps, and %S is always mapped to NULL.

If XBMLANGPATH is not set, but the environment variable XAPPLRESDIR is set, the following pathnames are searched:


If neither XBMLANGPATH nor XAPPLRESDIR is set, the following pathnames are searched:


These paths are defaults that vendors may change. For example, a vendor may use different directories for /usr/lib/X11 and /usr/include/X11.

The following substitutions are used in these paths:

The image name, from the image_name argument
The class name of the application
The display's language string
The language component of the display's language string

Parameter descriptions are listed below:

Specifies the display screen on which the pixmap is to be drawn
Specifies the name of the image to be used to generate the pixmap
Combines the image with the foreground color to create the pixmap if the image referenced is a bit-per-pixel image
Combines the image with the background color to create the pixmap if the image referenced is a bit-per-pixel image
Specifies the depth of the pixmap


Returns a pixmap when successful; returns XmUNSPECIFIED_PIXMAP if the image corresponding to image_name cannot be found.


XmDestroyPixmap(3X), XmInstallImage(3X), and XmUninstallImage(3X).