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/*
* Copyright 1999 The XFree86 Project
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Written by David Bateman
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <errno.h>
#include <X11/Xos.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/xf86vmode.h>
#include <ctype.h>
#include <stdlib.h>
static char *ProgramName;
static int MajorVersion, MinorVersion;
static int EventBase, ErrorBase;
/* Minimum extension version required */
#define MINMAJOR 2
#define MINMINOR 0
/* Maximum and Minimum gamma values */
#define GAMMA_MIN 0.1f
#define GAMMA_MAX 10.0f
static void _X_NORETURN
Syntax(const char *errmsg)
{
if (errmsg != NULL)
fprintf (stderr, "%s: %s\n\n", ProgramName, errmsg);
fprintf (stderr, "usage: %s [-options]\n\n%s", ProgramName,
"where the available options are:\n"
" -display host:dpy or -d\n"
" -quiet or -q\n"
" -screen or -s\n"
" -version or -v\n"
" -gamma f.f Gamma Value\n"
" -rgamma f.f Red Gamma Value\n"
" -ggamma f.f Green Gamma Value\n"
" -bgamma f.f Blue Gamma Value\n\n"
"If no gamma is specified, returns the current setting\n");
exit (1);
}
/*
* The following is a hack until XrmParseCommand is ready. It determines
* whether or not the given string is an abbreviation of the arg.
*/
static Bool
isabbreviation(const char *arg, const char *s, size_t minslen)
{
size_t arglen;
size_t slen;
/* exact match */
if (strcmp (arg, s) == 0) return (True);
arglen = strlen (arg);
slen = strlen (s);
/* too long or too short */
if (slen >= arglen || slen < minslen) return (False);
/* abbreviation */
if (strncmp (arg, s, slen) == 0) return (True);
/* bad */
return (False);
}
int
main(int argc, char *argv[])
{
int ret = 2;
char *displayname = NULL;
Display *dpy;
float gam = -1.0f, rgam = -1.0f, ggam = -1.0f, bgam = -1.0f;
XF86VidModeGamma gamma;
Bool quiet = False;
int screen = -1;
ProgramName = argv[0];
for (int i = 1; i < argc; i++) {
char *arg = argv[i];
if (arg[0] == '-') {
if (isabbreviation ("-display", arg, 1)) {
if (++i >= argc) Syntax ("-display requires an argument");
displayname = argv[i];
continue;
} else if (isabbreviation ("-quiet", arg, 1)) {
quiet = True;
continue;
} else if (isabbreviation ("-version", arg, 1)) {
puts(PACKAGE_STRING);
exit(0);
} else if (isabbreviation ("-screen", arg, 1)) {
if (++i >= argc) Syntax ("-screen requires an argument");
screen = atoi(argv[i]);
continue;
} else if (isabbreviation ("-gamma", arg, 2)) {
if (++i >= argc) Syntax ("-gamma requires an argument");
if ((rgam >= 0.0f) || (ggam >= 0.0f) || (bgam >= 0.0f))
Syntax ("-gamma cannot be used with -rgamma, -ggamma, or -bgamma");
gam = (float)atof(argv[i]);
if ((gam < GAMMA_MIN) || (gam > GAMMA_MAX)) {
fprintf(stderr,
"Gamma values must be between %6.3f and %6.3f\n",
(double)GAMMA_MIN, (double)GAMMA_MAX);
exit(1);
}
continue;
} else if (isabbreviation ("-rgamma", arg, 2)) {
if (++i >= argc) Syntax ("-rgamma requires an argument");
if (gam >= 0.0f) Syntax ("cannot set both -gamma and -rgamma");
rgam = (float)atof(argv[i]);
if ((rgam < GAMMA_MIN) || (rgam > GAMMA_MAX)) {
fprintf(stderr,
"Gamma values must be between %6.3f and %6.3f\n",
(double)GAMMA_MIN, (double)GAMMA_MAX);
exit(1);
}
continue;
} else if (isabbreviation ("-ggamma", arg, 2)) {
if (++i >= argc) Syntax ("-ggamma requires an argument");
if (gam >= 0.0f) Syntax ("cannot set both -gamma and -ggamma");
ggam = (float)atof(argv[i]);
if ((ggam < GAMMA_MIN) || (ggam > GAMMA_MAX)) {
fprintf(stderr,
"Gamma values must be between %6.3f and %6.3f\n",
(double)GAMMA_MIN, (double)GAMMA_MAX);
exit(1);
}
continue;
} else if (isabbreviation ("-bgamma", arg, 2)) {
if (++i >= argc) Syntax ("-bgamma requires an argument");
if (gam >= 0.0f) Syntax ("cannot set both -gamma and -bgamma");
bgam = (float)atof(argv[i]);
if ((bgam < GAMMA_MIN) || (bgam > GAMMA_MAX)) {
fprintf(stderr,
"Gamma values must be between %6.3f and %6.3f\n",
(double)GAMMA_MIN, (double)GAMMA_MAX);
exit(1);
}
continue;
} else {
if (!isabbreviation ("-help", arg, 1))
fprintf (stderr, "%s: unrecognized argument %s\n\n",
ProgramName, arg);
Syntax (NULL);
}
} else {
fprintf (stderr, "%s: unrecognized argument %s\n\n",
ProgramName, arg);
Syntax (NULL);
}
}
if ((dpy = XOpenDisplay(displayname)) == NULL) {
fprintf (stderr, "%s: unable to open display '%s'\n",
ProgramName, XDisplayName (displayname));
exit(1);
} else if (screen == -1)
screen = DefaultScreen(dpy);
if (!XF86VidModeQueryVersion(dpy, &MajorVersion, &MinorVersion)) {
fprintf(stderr, "Unable to query video extension version\n");
goto finish;
}
if (!XF86VidModeQueryExtension(dpy, &EventBase, &ErrorBase)) {
fprintf(stderr, "Unable to query video extension information\n");
goto finish;
}
/* Fail if the extension version in the server is too old */
if (MajorVersion < MINMAJOR ||
(MajorVersion == MINMAJOR && MinorVersion < MINMINOR)) {
fprintf(stderr,
"Xserver is running an old XFree86-VidModeExtension version"
" (%d.%d)\n", MajorVersion, MinorVersion);
fprintf(stderr, "Minimum required version is %d.%d\n",
MINMAJOR, MINMINOR);
goto finish;
}
if (!XF86VidModeGetGamma(dpy, screen, &gamma)) {
fprintf(stderr, "Unable to query gamma correction\n");
goto finish;
} else if (!quiet)
fprintf(stderr, "-> Red %6.3f, Green %6.3f, Blue %6.3f\n",
(double)gamma.red, (double)gamma.green, (double)gamma.blue);
if (gam >= 0.0f) {
gamma.red = gam;
gamma.green = gam;
gamma.blue = gam;
} else if ((rgam >= 0.0f) || (ggam >= 0.0f) || (bgam >= 0.0f)) {
if (rgam >= 0.0f) gamma.red = rgam;
if (ggam >= 0.0f) gamma.green = ggam;
if (bgam >= 0.0f) gamma.blue = bgam;
} else {
/* Not changing gamma, all done */
ret = 0;
goto finish;
}
/* Change gamma now */
if (!XF86VidModeSetGamma(dpy, screen, &gamma)) {
fprintf(stderr, "Unable to set gamma correction\n");
} else {
if (!XF86VidModeGetGamma(dpy, screen, &gamma)) {
fprintf(stderr, "Unable to query gamma correction\n");
} else {
ret = 0; /* Success! */
if (!quiet) {
fprintf(stderr, "<- Red %6.3f, Green %6.3f, Blue %6.3f\n",
(double)gamma.red, (double)gamma.green,
(double)gamma.blue);
}
}
}
finish:
XCloseDisplay (dpy);
exit (ret);
}
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