/** * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdlib.h> #include <stdio.h> #include <inttypes.h> #include <X11/Xlib.h> #include <X11/extensions/xf86vmode.h> /** * The X server display */ static Display* display; /** * The X screen */ static int screen; /** * Size of colour curves on the X-axis */ static int curve_size; /** * Start stage of colour curve control * * @param use_screen The screen to use * @return Zero on error, otherwise the size of colours curves */ int blueshift_vidmode_open(int use_screen) { int _major, _minor; /* Get X display */ if ((display = XOpenDisplay(NULL)) == NULL) { fprintf(stderr, "Cannot open X display\n"); return 0; } /* Check for VidMode extension */ if (XF86VidModeQueryVersion(display, &_major, &_minor) == 0) { fprintf(stderr, "VidMode version query failed\n"); XCloseDisplay(display); return 0; } /* Get curve X-axis size */ screen = use_screen; if (XF86VidModeGetGammaRampSize(display, screen, &curve_size) == 0) { fprintf(stderr, "VidMode gamma size query failed\n"); XCloseDisplay(display); return 0; } if (curve_size <= 1) { fprintf(stderr, "VidMode gamma size query failed, impossible dimension\n"); XCloseDisplay(display); return 0; } return curve_size; } /** * Gets the current colour curves * * @param use_crtc The CRTC to use * @param r_gamma Storage location for the red colour curve * @param g_gamma Storage location for the green colour curve * @param b_gamma Storage location for the blue colour curve * @return Zero on success */ int blueshift_vidmode_read(int use_crtc, uint16_t* r_gamma, uint16_t* g_gamma, uint16_t* b_gamma) { (void) use_crtc; /* Read curves */ if (XF86VidModeGetGammaRamp(display, screen, curve_size, r_gamma, g_gamma, b_gamma) == 0) { fprintf(stderr, "VidMode gamma query failed\n"); XCloseDisplay(display); return 1; } return 0; } /** * Apply stage of colour curve control * * @param use_crtcs Mask of CRTC:s to use * @param r_curve The red colour curve * @param g_curve The green colour curve * @param b_curve The blue colour curve * @return Zero on success */ int blueshift_vidmode_apply(uint64_t use_crtcs, uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve) { (void) use_crtcs; /* Apply curves */ if (XF86VidModeSetGammaRamp(display, screen, curve_size, r_curve, g_curve, b_curve) == 0) { fprintf(stderr, "VidMode gamma control failed\n"); return 1; } return 0; } /** * Resource freeing stage of colour curve control */ void blueshift_vidmode_close(void) { /* Free remaining resources */ XCloseDisplay(display); }