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- //
- // "$Id: Fl_visual.cxx,v 1.7 1999/01/07 19:17:32 mike Exp $"
- //
- // Visual support for the Fast Light Tool Kit (FLTK).
- //
- // Copyright 1998-1999 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@easysw.com".
- //
-
- // 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;
- }
- #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 (!(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;
- #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 1999/01/07 19:17:32 mike Exp $".
- //
-