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//
// "$Id: Fl_visual.cxx,v 1.7.2.4.2.6 2004/04/11 04:38:59 easysw Exp $"
//
// Visual support for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2004 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//
// Set the default visual according to passed switches:
#include <config.h>
#include <FL/Fl.H>
#include <FL/x.H>
#ifdef WIN32
int Fl::visual(int flags) {
fl_GetDC(0);
if (flags & FL_DOUBLE) return 0;
if (!(flags & FL_INDEX) &&
GetDeviceCaps(fl_gc,BITSPIXEL) <= 8) return 0;
if ((flags & FL_RGB8) && GetDeviceCaps(fl_gc,BITSPIXEL)<24) return 0;
return 1;
}
#elif defined(__APPLE__)
// \todo Mac : need to implement Visual flags
int Fl::visual(int flags) {
(void)flags;
return 1;
}
#else
#if USE_XDBE
#include <X11/extensions/Xdbe.h>
#endif
static int test_visual(XVisualInfo& v, int flags) {
if (v.screen != fl_screen) return 0;
#if USE_COLORMAP
if (!(flags & FL_INDEX)) {
if (v.c_class != StaticColor && v.c_class != TrueColor) return 0;
if (v.depth <= 8) return 0; // fltk will work better in colormap mode
}
if (flags & FL_RGB8) {
if (v.depth < 24) return 0;
}
// for now, fltk does not like colormaps of more than 8 bits:
if ((v.c_class&1) && v.depth > 8) return 0;
#else
// simpler if we can't use colormapped visuals at all:
if (v.c_class != StaticColor && v.c_class != TrueColor) return 0;
#endif
#if USE_XDBE
if (flags & FL_DOUBLE) {
static XdbeScreenVisualInfo *xdbejunk;
if (!xdbejunk) {
int event_base, error_base;
if (!XdbeQueryExtension(fl_display, &event_base, &error_base)) return 0;
Drawable root = RootWindow(fl_display,fl_screen);
int numscreens = 1;
xdbejunk = XdbeGetVisualInfo(fl_display,&root,&numscreens);
if (!xdbejunk) return 0;
}
for (int j = 0; ; j++) {
if (j >= xdbejunk->count) return 0;
if (xdbejunk->visinfo[j].visual == v.visualid) break;
}
}
#endif
return 1;
}
int Fl::visual(int flags) {
#if USE_XDBE == 0
if (flags & FL_DOUBLE) return 0;
#endif
fl_open_display();
// always use default if possible:
if (test_visual(*fl_visual, flags)) return 1;
// get all the visuals:
XVisualInfo vTemplate;
int num;
XVisualInfo *visualList = XGetVisualInfo(fl_display, 0, &vTemplate, &num);
// find all matches, use the one with greatest depth:
XVisualInfo *found = 0;
for (int i=0; i<num; i++) if (test_visual(visualList[i], flags)) {
if (!found || found->depth < visualList[i].depth)
found = &visualList[i];
}
if (!found) {XFree((void*)visualList); return 0;}
fl_visual = found;
fl_colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
fl_visual->visual, AllocNone);
return 1;
}
#endif
//
// End of "$Id: Fl_visual.cxx,v 1.7.2.4.2.6 2004/04/11 04:38:59 easysw Exp $".
//
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