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/* vidmode.c -- X VidMode gamma adjustment source
This file is part of Redshift.
Redshift is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Redshift is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Redshift. If not, see <http://www.gnu.org/licenses/>.
Copyright (c) 2009 Jon Lund Steffensen <jonlst@gmail.com>
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <X11/Xlib.h>
#include <X11/extensions/xf86vmode.h>
#include "colorramp.h"
int
vidmode_check_extension()
{
int r;
/* Open display */
Display *dpy = XOpenDisplay(NULL);
if (dpy == NULL) {
fprintf(stderr, "XOpenDisplay failed.\n");
return -1;
}
/* Query extension version */
int major, minor;
r = XF86VidModeQueryVersion(dpy, &major, &minor);
if (!r) {
fprintf(stderr, "XF86VidModeQueryVersion failed.\n");
return -1;
}
/* TODO Check major/minor */
/* Close display */
XCloseDisplay(dpy);
return 0;
}
int
vidmode_set_temperature(int temp, float gamma[3])
{
int r;
/* Open display */
Display *dpy = XOpenDisplay(NULL);
if (dpy == NULL) {
fprintf(stderr, "XOpenDisplay failed.\n");
return -1;
}
/* Request size of gamma ramps for screen 0 */
int gamma_ramp_size;
r = XF86VidModeGetGammaRampSize(dpy, 0, &gamma_ramp_size);
if (!r) {
fprintf(stderr, "XF86VidModeGetGammaRampSize failed.\n");
XCloseDisplay(dpy);
return -1;
}
if (gamma_ramp_size == 0) {
fprintf(stderr, "Error: Gamma ramp size too small: %i\n",
gamma_ramp_size);
XCloseDisplay(dpy);
return -1;
}
/* Create new gamma ramps */
uint16_t *gamma_ramps = malloc(3*gamma_ramp_size*sizeof(uint16_t));
if (gamma_ramps == NULL) abort();
uint16_t *gamma_r = &gamma_ramps[0*gamma_ramp_size];
uint16_t *gamma_g = &gamma_ramps[1*gamma_ramp_size];
uint16_t *gamma_b = &gamma_ramps[2*gamma_ramp_size];
colorramp_fill(gamma_r, gamma_g, gamma_b, gamma_ramp_size,
temp, gamma);
/* Set new gamma ramps */
r = XF86VidModeSetGammaRamp(dpy, 0, gamma_ramp_size, gamma_r, gamma_g, gamma_b);
if (!r) {
fprintf(stderr, "XF86VidModeSetGammaRamp failed.\n");
XCloseDisplay(dpy);
return -1;
}
/* Close display */
XCloseDisplay(dpy);
return 0;
}
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