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//
// Visual list utility for the Fast Light Tool Kit (FLTK).
//
// List all the visuals on the screen, and dumps anything interesting
// about them to stdout.
//
// Does not use FLTK under X11.
//
// This file may be #included in another program to make a function to
// call to list the visuals. Fl.H must be included first to indicate this.
//
// Copyright 1998-2021 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#ifndef Fl_H
# define NEED_MAIN 1 // when not included by another FLTK program
#endif
#include <FL/platform.H> // for FLTK_USE_X11
#ifdef FLTK_USE_X11
#include <config.h>
#define HAVE_MULTIBUF 0
#ifdef NEED_MAIN
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <stdio.h>
#include <stdlib.h>
Display *fl_display;
int fl_screen;
const char *dname;
void fl_open_display() {
fl_display = XOpenDisplay(dname);
if (!fl_display) {
fprintf(stderr,"Can't open display: %s\n",XDisplayName(dname));
exit(1);
}
fl_screen = DefaultScreen(fl_display);
}
#endif // NEED_MAIN
const char *ClassNames[] = {
"StaticGray ",
"GrayScale ",
"StaticColor",
"PseudoColor",
"TrueColor ",
"DirectColor"
};
// SERVER_OVERLAY_VISUALS property element:
typedef struct _OverlayInfo {
long overlay_visual;
long transparent_type;
long value;
long layer;
} OverlayInfo;
#if HAVE_MULTIBUF
#include <X11/extensions/multibuf.h>
#endif
static void print_mask(XVisualInfo* p) {
int n = 0;
int what = 0;
int print_anything = 0;
char buf[20];
char *q = buf;
*q = 0;
int b; unsigned int m; for (b=32,m=0x80000000; ; b--,m>>=1) {
int new_what = 0;
if (p->red_mask&m) new_what = 'r';
else if (p->green_mask&m) new_what = 'g';
else if (p->blue_mask&m) new_what = 'b';
else new_what = '?';
if (new_what != what) {
if (what && (what != '?' || print_anything)) {
q += snprintf(q, sizeof(buf) - (q-buf), "%d%c", n, what);
print_anything = 1;
}
what = new_what;
n = 1;
} else {
n++;
}
if (!b) break;
}
printf("%7s", buf);
}
void list_visuals() {
fl_open_display();
XVisualInfo vTemplate;
int num;
XVisualInfo *visualList = XGetVisualInfo(fl_display,0,&vTemplate,&num);
XPixmapFormatValues *pfvlist;
static int numpfv;
pfvlist = XListPixmapFormats(fl_display, &numpfv);
OverlayInfo *overlayInfo = 0;
int numoverlayinfo = 0;
Atom overlayVisualsAtom = XInternAtom(fl_display,"SERVER_OVERLAY_VISUALS",1);
if (overlayVisualsAtom) {
unsigned long sizeData, bytesLeft;
Atom actualType;
int actualFormat;
if (!XGetWindowProperty(fl_display, RootWindow(fl_display, fl_screen),
overlayVisualsAtom, 0L, 10000L, False,
overlayVisualsAtom, &actualType, &actualFormat,
&sizeData, &bytesLeft,
(unsigned char **) &overlayInfo))
numoverlayinfo = int(sizeData/4);
}
#if HAVE_MULTIBUF
int event_base, error_base;
XmbufBufferInfo *mbuf, *sbuf;
int nmbuf = 0, nsbuf = 0;
if (XmbufQueryExtension(fl_display,&event_base, &error_base)) {
XmbufGetScreenInfo(fl_display,RootWindow(fl_display,fl_screen),
&nmbuf, &mbuf, &nsbuf, &sbuf);
}
#endif
for (int i=0; i<num; i++) {
XVisualInfo *p = visualList+i;
XPixmapFormatValues *pfv;
for (pfv = pfvlist; ; pfv++) {
if (pfv >= pfvlist+numpfv) {pfv = 0; break;} // should not happen!
if (pfv->depth == p->depth) break;
}
int j = pfv ? pfv->bits_per_pixel : 0;
printf(" %2ld: %s %2d/%d", p->visualid, ClassNames[p->c_class],
p->depth, j);
if (j < 10) putchar(' ');
print_mask(p);
for (j=0; j<numoverlayinfo; j++) {
OverlayInfo *o = &overlayInfo[j];
if (o->overlay_visual == long(p->visualid)) {
printf(" overlay(");
if (o->transparent_type==1) printf("transparent pixel %ld, ",o->value);
else if (o->transparent_type==2) printf("transparent mask %ld, ",o->value);
else printf("opaque, ");
printf("layer %ld)", o->layer);
}
}
#if HAVE_MULTIBUF
for (j=0; j<nmbuf; j++) {
XmbufBufferInfo *m = &mbuf[j];
if (m->visualid == p->visualid)
printf(" multibuffer(%d)", m->max_buffers);
}
for (j=0; j<nsbuf; j++) {
XmbufBufferInfo *m = &sbuf[j];
if (m->visualid == p->visualid)
printf(" stereo multibuffer(%d)", m->max_buffers);
}
#endif
if (p->visualid==XVisualIDFromVisual(DefaultVisual(fl_display,fl_screen)))
printf(" (default visual)");
putchar('\n');
}
if ( overlayInfo ) { XFree(overlayInfo); overlayInfo = 0; }
}
#endif // FLTK_USE_X11
#ifdef NEED_MAIN
# ifndef FLTK_USE_X11
# include <FL/fl_ask.H>
# endif
int main(int argc, char** argv) {
# ifdef FLTK_USE_X11
if (argc == 1);
else if (argc == 2 && argv[1][0]!='-') dname = argv[1];
else {fprintf(stderr,"usage: %s <display>\n",argv[0]); exit(1);}
list_visuals();
return 0;
# else
fl_alert("Currently, this program works only under X.");
return 1;
# endif // FLTK_USE_X11
}
#endif // NEED_MAIN
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