Pixmap Remarks (XForms (Forms Library) - Version 1.2 (Rev. 4) A Graphical User Interface Toolkit for X)

Previous: Pixmap Attributes, Up: Pixmap Object [Contents][Index]

#### 15.6.6 Remarks

The following routines may be handy for reading a pixmap file into a pixmap

    Pixmap fl_read_pixmapfile(Window win, const char *filename,
                              unsigned *width, unsigned *height,
                              Pixmap *shape_mask, int *hotx, int *hoty,
                              FL_COLOR tran);

where `win` is the window in which the pixmap is to be displayed. If the window is yet to be created, you can use the default window, returned by a call of `fl_default_window()`. Parameter `shape_mask` is a pointer to an already existing `Pixmap`, which, if not `NULL`, is used as a clipping mask to achieve transparency. `hotx` and `hoty` are the center of the pixmap (useful if the pixmap is to be used as a cursor). Parameter `tran` is currently not used.

If you already have the pixmap data in memory, the following routine can be used

    Pixmap fl_create_from_pixmapdata(Window win, char **data,
                                     unsigned *width, unsigned *height,
                                     Pixmap *shape_mask, int *hotx,
                                     int *hoty, FL_COLOR tran);

All parameters have the same meaning as for `fl_read_pixmapfile`.

Note that the Forms Library handles transparency, if specified in the pixmap file or data, for pixmap and pixmapbutton objects. However, when using `fl_read_pixmapfile()` or `fl_create_from_pixmapdata()`, the application programmer is responsible to set the clip mask in an appropriate GC.

Finally there is a routine that can be used to free a Pixmap

    void fl_free_pixmap(Pixmap id);

You will need the XPM library (version 3.4c or later)m developed by Arnaud Le Hors and Groupe Bull, to use pixmaps. The XPM library is avalialble as a package for most distributions, but can also be obtained from many X mirror sites, e.g., via anonymous FTP from (ftp://ftp.x.org/contrib/libraries/. Its home page is http://old.koalateam.com/lehors/xpm.html.

Previous: Pixmap Attributes, Up: Pixmap Object [Contents][Index]