NAME

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

SYNOPSIS

#include <Xm/Xm.h>
Pixmap XmGetPixmapByDepth (screen, image_name,foreground, background, depth)

Screen∗screen;
char∗image_name;
Pixelforeground;
Pixelbackground;
intdepth;

DESCRIPTION

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 either an xpm pixmap file or 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 the following search paths, specified by XMICONSEARCHPATH or XMICONBMSEARCHPATH depending on the type of display, XBMLANGPATH and a default search path, which varies depending on whether or not the XAPPLRESDIR environment variable is set.  The order of the search, is XMICONSEARCHPATH or XMICONBMSEARCHPATH first, XBMLANGPATH second, XAPPLRESDIR third, and finally the vendor default search path (see below), until either the file is found or the paths are all visited. 

Both the environment variables XMICONSEARCHPATH and XMICONBMSEARCHPATH specify a search path for xpm pixmap and X bitmap files.  XmGetPixmapByDepth uses XMICONSEARCHPATH on a color display and XMICONBMSEARCHPATH on a monolithic one.  The type of the display is determined automatically through the use of Xm/ColorObj.  So XMICONSEARCHPATH should consist of a path where locations of xpm files precede those of bitmap files, and XMICONBMSEARCHPATH should maintain a search path in favor of bitmap files.  These two environment variables are new in CDE Motif and will be in Motif 2.0.  The XBMLANGPATH environment variable, which is here for backward compatibility with Motif 1.x, specifies a search path only for X bitmap files.  All these variables can contain the substitution field %B, where the image_name argument to XmGetPixmapByDepth is substituted for %B.  They 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 neither XMICONSEARCHPATH (XMICONBMSEARCHPATH if monolithic) nor XBMLANGPATH is set but the environment variable XAPPLRESDIR is set, the following pathnames are searched:

%B
$XAPPLRESDIR/%L/bitmaps/%N/%B
$XAPPLRESDIR/%l/bitmaps/%N/%B
$XAPPLRESDIR/bitmaps/%N/%B
$XAPPLRESDIR/%L/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/bitmaps/%N/%B
/usr/lib/X11/bitmaps/%N/%B
/usr/lib/X11/%L/bitmaps/%B
/usr/lib/X11/%l/bitmaps/%B
/usr/lib/X11/bitmaps/%B
/usr/include/X11/bitmaps/%B

If none of the above paths is set, the following pathnames are searched:

%B
$HOME/%L/bitmaps/%N/%B
$HOME/%l/bitmaps/%N/%B
$HOME/bitmaps/%N/%B
$HOME/%L/bitmaps/%B
$HOME/%l/bitmaps/%B
$HOME/bitmaps/%B
$HOME/%B
/usr/lib/X11/%L/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/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:

%BThe image name, from the image_name argument

%NThe class name of the application

%LThe display’s language string

%lThe language component of the display’s language string

Parameter descriptions are listed below:

screen
Specifies the display screen on which the pixmap is to be drawn

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

depthSpecifies the depth of the pixmap

RETURN VALUE

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

RELATED INFORMATION

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

Motif Release 1.2: May 1992  —  Last change: