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XmGetPixmap

XmGetPixmap

Section: Misc. Reference Manual Pages (library call)
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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 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), OpenMotif 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 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 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.  

RELATED

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN
RELATED

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Time: 21:58:50 GMT, April 16, 2011