XmGetPixmap(library call) XmGetPixmap(library call)
NAME
XmGetPixmap -- A pixmap caching function that generates a pixmap,
stores it in a pixmap cache, and returns the pixmap
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 rel-
atively 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), OpenMotif also sup-
ports 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 OpenMotif, in order to check if current version
supports PNG ang 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 XmGet-
PixmapByDepth reference page for further details.
The XBMLANGPATH environment variable specifies a search path for X bit-
map 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:
o %B
o $XAPPLRESDIR/%L/bitmaps/%N/%B
o $XAPPLRESDIR/%l_%t/bitmaps/%N/%B
o $XAPPLRESDIR/%l/bitmaps/%N/%B
o $XAPPLRESDIR/bitmaps/%N/%B
o $XAPPLRESDIR/%L/bitmaps/%B
o $XAPPLRESDIR/%l_%t/bitmaps/%B
o $XAPPLRESDIR/%l/bitmaps/%B
o $XAPPLRESDIR/bitmaps/%B
o $HOME/bitmaps/%B
o $HOME/%B
o /usr/lib/X11/%L/bitmaps/%N/%B
o /usr/lib/X11/%l_%t/bitmaps/%N/%B
o /usr/lib/X11/%l/bitmaps/%N/%B
o /usr/lib/X11/bitmaps/%N/%B
o /usr/lib/X11/%L/bitmaps/%B
o /usr/lib/X11/%l_%t/bitmaps/%B
o /usr/lib/X11/%l/bitmaps/%B
o /usr/lib/X11/bitmaps/%B
o /usr/include/X11/bitmaps/%B
If neither XBMLANGPATH nor XAPPLRESDIR is set, the following pathnames
are searched:
o %B
o $HOME/%L/bitmaps/%N/%B
o $HOME/%l_%t/bitmaps/%N/%B
o $HOME/%l/bitmaps/%N/%B
o $HOME/bitmaps/%N/%B
o $HOME/%L/bitmaps/%B
o $HOME/%l_%t/bitmaps/%B
o $HOME/%l/bitmaps/%B
o $HOME/bitmaps/%B
o $HOME/%B
o /usr/lib/X11/%L/bitmaps/%N/%B
o /usr/lib/X11/%l_%t/bitmaps/%N/%B
o /usr/lib/X11/%l/bitmaps/%N/%B
o /usr/lib/X11/bitmaps/%N/%B
o /usr/lib/X11/%L/bitmaps/%B
o /usr/lib/X11/%l_%t/bitmaps/%B
o /usr/lib/X11/%l/bitmaps/%B
o /usr/lib/X11/bitmaps/%B
o /usr/include/X11/bitmaps/%B
These paths are defaults that vendors may change. For example, a ven-
dor 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 call-
ing setlocale(LC_ALL, NULL).
%l_%t The language and territory component of the display's lan-
guage 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.
RELATED
XmDestroyPixmap(3), XmGetPixmapByDepth(3), XmInstallImage(3), and
XmUninstallImage(3).
XmGetPixmap(library call)
openMotif 2.3.1 - Generated Sun Nov 30 16:19:12 CST 2008