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-rw-r--r--colortemp.c273
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diff --git a/colortemp.c b/colortemp.c
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-/* colortemp.c -- X color temperature 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 <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <math.h>
-
-#include <xcb/xcb.h>
-#include <xcb/randr.h>
-
-
-/* Source: http://www.vendian.org/mncharity/dir3/blackbody/
- Rescaled to make exactly 6500K equal to full intensity in all channels. */
-static const float blackbody_color[] = {
- 1.0000, 0.0425, 0.0000, /* 1000K */
- 1.0000, 0.0668, 0.0000, /* 1100K */
- 1.0000, 0.0911, 0.0000, /* 1200K */
- 1.0000, 0.1149, 0.0000, /* ... */
- 1.0000, 0.1380, 0.0000,
- 1.0000, 0.1604, 0.0000,
- 1.0000, 0.1819, 0.0000,
- 1.0000, 0.2024, 0.0000,
- 1.0000, 0.2220, 0.0000,
- 1.0000, 0.2406, 0.0000,
- 1.0000, 0.2630, 0.0062,
- 1.0000, 0.2868, 0.0155,
- 1.0000, 0.3102, 0.0261,
- 1.0000, 0.3334, 0.0379,
- 1.0000, 0.3562, 0.0508,
- 1.0000, 0.3787, 0.0650,
- 1.0000, 0.4008, 0.0802,
- 1.0000, 0.4227, 0.0964,
- 1.0000, 0.4442, 0.1136,
- 1.0000, 0.4652, 0.1316,
- 1.0000, 0.4859, 0.1505,
- 1.0000, 0.5062, 0.1702,
- 1.0000, 0.5262, 0.1907,
- 1.0000, 0.5458, 0.2118,
- 1.0000, 0.5650, 0.2335,
- 1.0000, 0.5839, 0.2558,
- 1.0000, 0.6023, 0.2786,
- 1.0000, 0.6204, 0.3018,
- 1.0000, 0.6382, 0.3255,
- 1.0000, 0.6557, 0.3495,
- 1.0000, 0.6727, 0.3739,
- 1.0000, 0.6894, 0.3986,
- 1.0000, 0.7058, 0.4234,
- 1.0000, 0.7218, 0.4485,
- 1.0000, 0.7375, 0.4738,
- 1.0000, 0.7529, 0.4992,
- 1.0000, 0.7679, 0.5247,
- 1.0000, 0.7826, 0.5503,
- 1.0000, 0.7970, 0.5760,
- 1.0000, 0.8111, 0.6016,
- 1.0000, 0.8250, 0.6272,
- 1.0000, 0.8384, 0.6529,
- 1.0000, 0.8517, 0.6785,
- 1.0000, 0.8647, 0.7040,
- 1.0000, 0.8773, 0.7294,
- 1.0000, 0.8897, 0.7548,
- 1.0000, 0.9019, 0.7801,
- 1.0000, 0.9137, 0.8051,
- 1.0000, 0.9254, 0.8301,
- 1.0000, 0.9367, 0.8550,
- 1.0000, 0.9478, 0.8795,
- 1.0000, 0.9587, 0.9040,
- 1.0000, 0.9694, 0.9283,
- 1.0000, 0.9798, 0.9524,
- 1.0000, 0.9900, 0.9763,
- 1.0000, 1.0000, 1.0000, /* 6500K */
- 0.9771, 0.9867, 1.0000,
- 0.9554, 0.9740, 1.0000,
- 0.9349, 0.9618, 1.0000,
- 0.9154, 0.9500, 1.0000,
- 0.8968, 0.9389, 1.0000,
- 0.8792, 0.9282, 1.0000,
- 0.8624, 0.9179, 1.0000,
- 0.8465, 0.9080, 1.0000,
- 0.8313, 0.8986, 1.0000,
- 0.8167, 0.8895, 1.0000,
- 0.8029, 0.8808, 1.0000,
- 0.7896, 0.8724, 1.0000,
- 0.7769, 0.8643, 1.0000,
- 0.7648, 0.8565, 1.0000,
- 0.7532, 0.8490, 1.0000,
- 0.7420, 0.8418, 1.0000,
- 0.7314, 0.8348, 1.0000,
- 0.7212, 0.8281, 1.0000,
- 0.7113, 0.8216, 1.0000,
- 0.7018, 0.8153, 1.0000,
- 0.6927, 0.8092, 1.0000,
- 0.6839, 0.8032, 1.0000,
- 0.6755, 0.7975, 1.0000,
- 0.6674, 0.7921, 1.0000,
- 0.6595, 0.7867, 1.0000,
- 0.6520, 0.7816, 1.0000,
- 0.6447, 0.7765, 1.0000,
- 0.6376, 0.7717, 1.0000,
- 0.6308, 0.7670, 1.0000,
- 0.6242, 0.7623, 1.0000,
- 0.6179, 0.7579, 1.0000,
- 0.6117, 0.7536, 1.0000,
- 0.6058, 0.7493, 1.0000,
- 0.6000, 0.7453, 1.0000,
- 0.5944, 0.7414, 1.0000 /* 10000K */
-};
-
-
-static void
-interpolate_color(float a, const float *c1, const float *c2, float *c)
-{
- c[0] = (1.0-a)*c1[0] + a*c2[0];
- c[1] = (1.0-a)*c1[1] + a*c2[1];
- c[2] = (1.0-a)*c1[2] + a*c2[2];
-}
-
-int
-colortemp_check_extension()
-{
- xcb_generic_error_t *error;
-
- /* Open X server connection */
- xcb_connection_t *conn = xcb_connect(NULL, NULL);
-
- /* Query RandR version */
- xcb_randr_query_version_cookie_t ver_cookie =
- xcb_randr_query_version(conn, 1, 3);
- xcb_randr_query_version_reply_t *ver_reply =
- xcb_randr_query_version_reply(conn, ver_cookie, &error);
-
- if (error) {
- fprintf(stderr, "RANDR Query Version, error: %d\n",
- error->error_code);
- xcb_disconnect(conn);
- return -1;
- }
-
- if (ver_reply->major_version < 1 || ver_reply->minor_version < 3) {
- fprintf(stderr, "Unsupported RANDR version (%u.%u)\n",
- ver_reply->major_version, ver_reply->minor_version);
- free(ver_reply);
- xcb_disconnect(conn);
- return -1;
- }
-
- free(ver_reply);
-
- /* Close connection */
- xcb_disconnect(conn);
-
- return 0;
-}
-
-int
-colortemp_set_temperature(int temp, float gamma[3])
-{
- xcb_generic_error_t *error;
-
- /* Open X server connection */
- xcb_connection_t *conn = xcb_connect(NULL, NULL);
-
- /* Get first screen */
- const xcb_setup_t *setup = xcb_get_setup(conn);
- xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
- xcb_screen_t *screen = iter.data;
-
- /* Get list of CRTCs for the screen */
- xcb_randr_get_screen_resources_current_cookie_t res_cookie =
- xcb_randr_get_screen_resources_current(conn, screen->root);
- xcb_randr_get_screen_resources_current_reply_t *res_reply =
- xcb_randr_get_screen_resources_current_reply(conn, res_cookie,
- &error);
-
- if (error) {
- fprintf(stderr, "RANDR Get Screen Resources Current,"
- " error: %d\n", error->error_code);
- xcb_disconnect(conn);
- return -1;
- }
-
- xcb_randr_crtc_t *crtcs =
- xcb_randr_get_screen_resources_current_crtcs(res_reply);
- xcb_randr_crtc_t crtc = crtcs[0];
-
- free(res_reply);
-
- /* Request size of gamma ramps */
- xcb_randr_get_crtc_gamma_size_cookie_t gamma_size_cookie =
- xcb_randr_get_crtc_gamma_size(conn, crtc);
- xcb_randr_get_crtc_gamma_size_reply_t *gamma_size_reply =
- xcb_randr_get_crtc_gamma_size_reply(conn, gamma_size_cookie,
- &error);
-
- if (error) {
- fprintf(stderr, "RANDR Get CRTC Gamma Size, error: %d\n",
- error->error_code);
- xcb_disconnect(conn);
- return -1;
- }
-
- int gamma_ramp_size = gamma_size_reply->size;
-
- free(gamma_size_reply);
-
- if (gamma_ramp_size == 0) {
- fprintf(stderr, "Error: Gamma ramp size too small, %i\n",
- gamma_ramp_size);
- xcb_disconnect(conn);
- return -1;
- }
-
- /* Calculate white point */
- float white_point[3];
- float alpha = (temp % 100) / 100.0;
- int temp_index = ((temp - 1000) / 100)*3;
- interpolate_color(alpha, &blackbody_color[temp_index],
- &blackbody_color[temp_index+3], white_point);
-
- /* 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];
-
- for (int i = 0; i < gamma_ramp_size; i++) {
- gamma_r[i] = pow((float)i/gamma_ramp_size, 1.0/gamma[0]) *
- UINT16_MAX * white_point[0];
- gamma_g[i] = pow((float)i/gamma_ramp_size, 1.0/gamma[1]) *
- UINT16_MAX * white_point[1];
- gamma_b[i] = pow((float)i/gamma_ramp_size, 1.0/gamma[2]) *
- UINT16_MAX * white_point[2];
- }
-
- /* Set new gamma ramps */
- xcb_void_cookie_t gamma_set_cookie =
- xcb_randr_set_crtc_gamma_checked(conn, crtc, gamma_ramp_size,
- gamma_r, gamma_g, gamma_b);
- error = xcb_request_check(conn, gamma_set_cookie);
-
- if (error) {
- fprintf(stderr, "RANDR Set CRTC Gamma, error: %d\n",
- error->error_code);
- free(gamma_ramps);
- xcb_disconnect(conn);
- return -1;
- }
-
- free(gamma_ramps);
-
- /* Close connection */
- xcb_disconnect(conn);
-
- return 0;
-}