> There is another problem with X11 icon:
> window.icon((char *)p); does not support transparency.
> The reason is simple: transparency information is carried by the other
> pixmax ,the variable "mask" in your program and it is not transmitted to
> window.icon().
> To get icon with transparency you have to use Xlib functions:
> XGetWMHints() and XSetWMHints() to get X11 to communicate both pixmap to
> the window manager.
> See the previously posted message fore more details:
> http://fltk.org/newsgroups.php?gfltk.general+v:24241
In case anyone finds it useful, here's a snippet of code showing what I usually
do.
I've used this in a few places, and with a few different WM, and it appears to
do the Right Thing...
// in the headers I have...
// Application icon setting
#ifdef WIN32
# include "media/win32icon.h"
#elif !defined(__APPLE__) /* Not Apple and not win32 - assume Xlib applies */
# include <X11/xpm.h>
//# include "media/fn-edit-icon.xbm" -- monochrome XBM, not used
# include "media/fn5x64.xpm"
#endif // !WIN32
// then in the entry code, just before I show the first window, I have...
// Set icon for window before we show it (MacOS uses app bundle for icon...)
#ifdef WIN32
main_window->icon((char *)LoadIcon(fl_display, MAKEINTRESOURCE(IDI_ICON)));
#elif !defined(__APPLE__)
fl_open_display(); // Make sure the display is available before we try and
change it!
Pixmap pixmap, mask; // create pixmaps to hold the icon image and its mask
// load the XPM and prepare the mask
XpmCreatePixmapFromData(fl_display, DefaultRootWindow(fl_display),
(char**)fn5x64_xpm_data, &pixmap, &mask, 0);
// assign to the fltk main window
// note that the fltk icon handling DOES NOT honour transparency,
// so we fix that AFTER the window is shown (see below)
main_window->icon((char*)pixmap);
#endif // WIN32
main_window->show(argc, argv);
#ifdef WIN32
// The fltk icon code above only loads the default icon.
// Here, once the window is shown, we can assign
// additional icons, just to make things a bit nicer.
{
HANDLE bigicon = LoadImage(GetModuleHandle(0), MAKEINTRESOURCE(IDI_ICON),
IMAGE_ICON, 32, 32, 0);
SendMessage(fl_xid(main_window), WM_SETICON, ICON_BIG, (LPARAM)bigicon);
HANDLE smallicon = LoadImage(GetModuleHandle(0), MAKEINTRESOURCE(IDI_ICON),
IMAGE_ICON, 16, 16, 0);
SendMessage(fl_xid(main_window), WM_SETICON, ICON_SMALL, (LPARAM)smallicon);
}
#elif !defined(__APPLE__) /* Not Apple and not win32 - assume Xlib */
// The fltk icon code doesn't handle XPM transparency well, work around that
here...
{
// read in the current window hints, then modify them to allow icon
transparency
XWMHints* hints = XGetWMHints(fl_display, fl_xid(main_window));
hints->flags |= IconMaskHint; // ensure transparency mask is enabled for
the XPM icon
hints->icon_mask = mask; // set the transparency mask
XSetWMHints(fl_display, fl_xid(main_window), hints);
XFree(hints);
}
#endif // !WIN32
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