Ubuntu Manpage: XmGetPixmap — A pixmap caching function that generates a pixmap, stores it in a pixmap

NAME

       XmGetPixmap  —  A  pixmap  caching function that generates a pixmap, stores it in a pixmap
       cache, and returns the pixmap "XmGetPixmap" "pixmaps"

SYNOPSIS

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

DESCRIPTION

XmGetPixmap 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.

screen Specifies the display screen on which the pixmap is to be drawn. The depth of
the pixmap is the default depth for this screen.

image_name
Specifies the name of the image to be used to generate the pixmap

foreground
Combines the image with the foreground color to create the pixmap if the image
referenced is a bit-per-pixel image

background
Combines the image with the background color to create the pixmap if the image
referenced is a bit-per-pixel image

If a 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, the 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 XmGetPixmap opens
the file as specified. Otherwise, image_name specifies a filename. In this case,
XmGetPixmap 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 default search path contains a lot of
directories. Therefore, XmGetPixmap will need a relatively long time to search through
all these directories for pixmaps and bitmaps. Applications that use a lot of pixmaps and
bitmaps will probably run more quickly if XBMLANGPATH is set to a short list of
directories. In addition to X bitmap files (XBM), Motif also supports XPM (X Pixmap) file
formats and, from version 2.3, JPEG and PNG image formats. (Note that support of JPEG and
PNG image format is an optional feature of Motif, in order to check if current version
supports PNG and JPEG image formats the PNG_SUPPORT and JPEG_SUPPORT macros should be
checked correspondingly.) The XBMLANGPATH specifies the path for both XBM, XPM, PNG and
JPEG files. Refer to the XmGetPixmapByDepth reference page for further details.

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 XmGetPixmap 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:

• %B

• $XAPPLRESDIR/%L/bitmaps/%N/%B

• $XAPPLRESDIR/%l_%t/bitmaps/%N/%B

• $XAPPLRESDIR/%l/bitmaps/%N/%B

• $XAPPLRESDIR/bitmaps/%N/%B

• $XAPPLRESDIR/%L/bitmaps/%B

• $XAPPLRESDIR/%l_%t/bitmaps/%B

• $XAPPLRESDIR/%l/bitmaps/%B

• $XAPPLRESDIR/bitmaps/%B

• $HOME/bitmaps/%B

• $HOME/%B

• /usr/lib/X11/%L/bitmaps/%N/%B

• /usr/lib/X11/%l_%t/bitmaps/%N/%B

• /usr/lib/X11/%l/bitmaps/%N/%B

• /usr/lib/X11/bitmaps/%N/%B

• /usr/lib/X11/%L/bitmaps/%B

• /usr/lib/X11/%l_%t/bitmaps/%B

• /usr/lib/X11/%l/bitmaps/%B

• /usr/lib/X11/bitmaps/%B

• /usr/include/X11/bitmaps/%B

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

• %B

• $HOME/%L/bitmaps/%N/%B

• $HOME/%l_%t/bitmaps/%N/%B

• $HOME/%l/bitmaps/%N/%B

• $HOME/bitmaps/%N/%B

• $HOME/%L/bitmaps/%B

• $HOME/%l_%t/bitmaps/%B

• $HOME/%l/bitmaps/%B

• $HOME/bitmaps/%B

• $HOME/%B

• /usr/lib/X11/%L/bitmaps/%N/%B

• /usr/lib/X11/%l_%t/bitmaps/%N/%B

• /usr/lib/X11/%l/bitmaps/%N/%B

• /usr/lib/X11/bitmaps/%N/%B

• /usr/lib/X11/%L/bitmaps/%B

• /usr/lib/X11/%l_%t/bitmaps/%B

• /usr/lib/X11/%l/bitmaps/%B

• /usr/lib/X11/bitmaps/%B

• /usr/include/X11/bitmaps/%B

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:

%B The image name, from the image_name argument

%N The class name of the application

%L The display's language string. This string is influenced by XtSetLanguageProc.
The default string is determined by calling setlocale(LC_ALL, NULL).

%l_%t The language and territory component of the display's language string

%l The language component of the display's language string

The contents of the file must conform to the rules for X11 bitmap files. In other words,
Motif can read any X11 conformant bitmap file.

RETURN

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

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

                                                                                   XmGetPixmap(3)

NAME

SYNOPSIS

DESCRIPTION

RETURN

RELATED