00cb676e11
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2936 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
120 lines
3.5 KiB
C++
120 lines
3.5 KiB
C++
//
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// "$Id: Fl_visual.cxx,v 1.7.2.4.2.5 2003/01/30 21:43:10 easysw Exp $"
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//
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// Visual support for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2003 by Bill Spitzak and others.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems to "fltk-bugs@fltk.org".
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//
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// Set the default visual according to passed switches:
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#include <config.h>
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#include <FL/Fl.H>
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#include <FL/x.H>
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#ifdef WIN32
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int Fl::visual(int flags) {
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fl_GetDC(0);
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if (flags & FL_DOUBLE) return 0;
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if (!(flags & FL_INDEX) &&
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GetDeviceCaps(fl_gc,BITSPIXEL) <= 8) return 0;
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if ((flags & FL_RGB8) && GetDeviceCaps(fl_gc,BITSPIXEL)<24) return 0;
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return 1;
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}
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#elif defined(__APPLE__)
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// \todo Mac : need to implement Visual flags
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int Fl::visual(int flags) {
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(void)flags;
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return 1;
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}
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#else
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#if USE_XDBE
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#include <X11/extensions/Xdbe.h>
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#endif
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static int test_visual(XVisualInfo& v, int flags) {
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if (v.screen != fl_screen) return 0;
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#if USE_COLORMAP
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if (!(flags & FL_INDEX)) {
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if (v.c_class != StaticColor && v.c_class != TrueColor) return 0;
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if (v.depth <= 8) return 0; // fltk will work better in colormap mode
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}
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if (flags & FL_RGB8) {
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if (v.depth < 24) return 0;
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}
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// for now, fltk does not like colormaps of more than 8 bits:
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if ((v.c_class&1) && v.depth > 8) return 0;
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#else
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// simpler if we can't use colormapped visuals at all:
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if (v.c_class != StaticColor && v.c_class != TrueColor) return 0;
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#endif
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#if USE_XDBE
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if (flags & FL_DOUBLE) {
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static XdbeScreenVisualInfo *xdbejunk;
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if (!xdbejunk) {
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int event_base, error_base;
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if (!XdbeQueryExtension(fl_display, &event_base, &error_base)) return 0;
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Drawable root = RootWindow(fl_display,fl_screen);
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int numscreens = 1;
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xdbejunk = XdbeGetVisualInfo(fl_display,&root,&numscreens);
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if (!xdbejunk) return 0;
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}
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for (int j = 0; ; j++) {
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if (j >= xdbejunk->count) return 0;
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if (xdbejunk->visinfo[j].visual == v.visualid) break;
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}
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}
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#endif
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return 1;
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}
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int Fl::visual(int flags) {
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#if USE_XDBE == 0
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if (flags & FL_DOUBLE) return 0;
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#endif
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fl_open_display();
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// always use default if possible:
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if (test_visual(*fl_visual, flags)) return 1;
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// get all the visuals:
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XVisualInfo vTemplate;
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int num;
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XVisualInfo *visualList = XGetVisualInfo(fl_display, 0, &vTemplate, &num);
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// find all matches, use the one with greatest depth:
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XVisualInfo *found = 0;
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for (int i=0; i<num; i++) if (test_visual(visualList[i], flags)) {
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if (!found || found->depth < visualList[i].depth)
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found = &visualList[i];
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}
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if (!found) {XFree((void*)visualList); return 0;}
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fl_visual = found;
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fl_colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
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fl_visual->visual, AllocNone);
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return 1;
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}
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#endif
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//
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// End of "$Id: Fl_visual.cxx,v 1.7.2.4.2.5 2003/01/30 21:43:10 easysw Exp $".
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//
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