132 lines
4.2 KiB
C++
132 lines
4.2 KiB
C++
//
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// "$Id: Fl_visual.cxx 7903 2010-11-28 21:06:39Z matt $"
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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 1998-2010 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 on the following page:
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//
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// http://www.fltk.org/str.php
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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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/** \fn Fl::visual(int flags)
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Selects a visual so that your graphics are drawn correctly. This is
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only allowed before you call show() on any windows. This does nothing
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if the default visual satisfies the capabilities, or if no visual
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satisfies the capabilities, or on systems that don't have such
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brain-dead notions.
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<P>Only the following combinations do anything useful:
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<UL>
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<LI>Fl::visual(FL_RGB)
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<BR>Full/true color (if there are several depths FLTK chooses the
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largest). Do this if you use fl_draw_image
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for much better (non-dithered) output.
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<BR> </LI>
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<LI>Fl::visual(FL_RGB8)
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<BR>Full color with at least 24 bits of color. FL_RGB will
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always pick this if available, but if not it will happily return a
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less-than-24 bit deep visual. This call fails if 24 bits are not
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available.
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<BR> </LI>
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<LI>Fl::visual(FL_DOUBLE|FL_INDEX)
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<BR>Hardware double buffering. Call this if you are going to use
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Fl_Double_Window.
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<BR> </LI>
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<LI>Fl::visual(FL_DOUBLE|FL_RGB)</LI>
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<LI>Fl::visual(FL_DOUBLE|FL_RGB8)
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<BR>Hardware double buffering and full color.
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</UL>
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<P>This returns true if the system has the capabilities by default or
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FLTK suceeded in turing them on. Your program will still work even if
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this returns false (it just won't look as good).
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*/
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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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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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return 1;
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}
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int Fl::visual(int flags) {
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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 7903 2010-11-28 21:06:39Z matt $".
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//
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