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// "$Id: list_visuals.cxx,v 1.1 2002/01/30 23:51:19 edgomez Exp $"
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// Visual list utility for the Fast Light Tool Kit (FLTK).
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// List all the visuals on the screen, and dumps anything interesting
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// about them to stdout.
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// This file may be #included in another program to make a function to
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// call to list the visuals. Fl.H must be included first to indicate this.
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// Copyright 1998-2000 by Bill Spitzak and others.
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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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// 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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// 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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// Please report all bugs and problems to "fltk-bugs@fltk.org".
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#include <FL/fl_message.H>
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/*int main(int, char**) {
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fl_alert("Currently, this program works only under X.");
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#include <X11/Xutil.h>
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#include <X11/Xatom.h>
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void fl_open_display() {
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fl_display = XOpenDisplay(dname);
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fprintf(stderr,"Can't open display: %s\n",XDisplayName(dname));
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fl_screen = DefaultScreen(fl_display);
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const char *ClassNames[] = {
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// SERVER_OVERLAY_VISUALS property element:
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typedef struct _OverlayInfo {
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long transparent_type;
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#include <X11/extensions/multibuf.h>
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#include <X11/extensions/Xdbe.h>
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static void print_mask(XVisualInfo* p) {
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int print_anything = 0;
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int b; unsigned int m; for (b=32,m=0x80000000; ; b--,m>>=1) {
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if (p->red_mask&m) new_what = 'r';
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else if (p->green_mask&m) new_what = 'g';
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else if (p->blue_mask&m) new_what = 'b';
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if (new_what != what) {
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if (what && (what != '?' || print_anything)) {
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q += sprintf(q,"%d%c", n, what);
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void list_visuals() {
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XVisualInfo vTemplate;
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XVisualInfo *visualList = XGetVisualInfo(fl_display,0,&vTemplate,&num);
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XPixmapFormatValues *pfvlist;
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pfvlist = XListPixmapFormats(fl_display, &numpfv);
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OverlayInfo *overlayInfo = 0;
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int numoverlayinfo = 0;
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Atom overlayVisualsAtom = XInternAtom(fl_display,"SERVER_OVERLAY_VISUALS",1);
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if (overlayVisualsAtom) {
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unsigned long sizeData, bytesLeft;
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if (!XGetWindowProperty(fl_display, RootWindow(fl_display, fl_screen),
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overlayVisualsAtom, 0L, 10000L, False,
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overlayVisualsAtom, &actualType, &actualFormat,
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&sizeData, &bytesLeft,
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(unsigned char **) &overlayInfo))
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numoverlayinfo = int(sizeData/4);
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int event_base, error_base;
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XmbufBufferInfo *mbuf, *sbuf;
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int nmbuf = 0, nsbuf = 0;
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if (XmbufQueryExtension(fl_display,&event_base, &error_base)) {
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XmbufGetScreenInfo(fl_display,RootWindow(fl_display,fl_screen),
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&nmbuf, &mbuf, &nsbuf, &sbuf);
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int event_base, error_base;
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XdbeVisualInfo *dbe = 0;
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if (XdbeQueryExtension(fl_display, &event_base, &error_base)) {
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Drawable root = RootWindow(fl_display,fl_screen);
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XdbeScreenVisualInfo *a = XdbeGetVisualInfo(fl_display,&root,&numscreens);
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if (!a) printf("error getting double buffer visuals\n");
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numdouble = a->count;
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for (int i=0; i<num; i++) {
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XVisualInfo *p = visualList+i;
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XPixmapFormatValues *pfv;
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for (pfv = pfvlist; ; pfv++) {
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if (pfv >= pfvlist+numpfv) {pfv = 0; break;} // should not happen!
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if (pfv->depth == p->depth) break;
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int j = pfv ? pfv->bits_per_pixel : 0;
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printf(" %2ld: %s %2d/%d", p->visualid, ClassNames[p->c_class],
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if (j < 10) putchar(' ');
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for (j=0; j<numoverlayinfo; j++) {
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OverlayInfo *o = &overlayInfo[j];
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if (o->overlay_visual == long(p->visualid)) {
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if (o->transparent_type==1) printf("transparent pixel %ld, ",o->value);
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else if (o->transparent_type==2) printf("transparent mask %ld, ",o->value);
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else printf("opaque, ");
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printf("layer %ld)", o->layer);
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for (j=0; j<nmbuf; j++) {
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XmbufBufferInfo *m = &mbuf[j];
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if (m->visualid == p->visualid)
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printf(" multibuffer(%d)", m->max_buffers);
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for (j=0; j<nsbuf; j++) {
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XmbufBufferInfo *m = &sbuf[j];
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if (m->visualid == p->visualid)
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printf(" stereo multibuffer(%d)", m->max_buffers);
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for (j = 0; j < numdouble; j++) if (dbe[j].visual == p->visualid)
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printf(" doublebuf(perflevel %d)",dbe[j].perflevel);
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if (p->visualid==XVisualIDFromVisual(DefaultVisual(fl_display,fl_screen)))
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printf(" (default visual)");
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/*int main(int argc, char **argv) {
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else if (argc == 2 && argv[1][0]!='-') dname = argv[1];
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else {fprintf(stderr,"usage: %s <display>\n",argv[0]); exit(1);}
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// End of "$Id: list_visuals.cxx,v 1.1 2002/01/30 23:51:19 edgomez Exp $".
added
removed
test/Fltk/list_visuals.cxx
