/**
* 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 <xcb/xcb.h>
#include <xcb/randr.h>
/**
* The major version of RandR the program expects
*/
#define RANDR_VERSION_MAJOR 1U
/**
* The minor version of RandR the program expects
*/
#define RANDR_VERSION_MINOR 3U
/**
* Data structure for CRTC caches
*/
typedef struct blueshift_randr_crtc
{
/**
* Size of colour curves on the X-axis
*/
unsigned int curve_size;
/**
* CRT controller
*/
xcb_randr_crtc_t* crtc;
} blueshift_randr_crtc_t;
/**
* Connection to the X server
*/
static xcb_connection_t* connection;
/**
* Used to store errors in
*/
static xcb_generic_error_t* error;
/**
* Screen resources
*/
static xcb_randr_get_screen_resources_current_reply_t* res_reply;
/**
* The first CRTC
*/
static blueshift_randr_crtc_t* crtcs;
/**
* The CRTC after the last CRTC
*/
static blueshift_randr_crtc_t* crtcs_end;
/**
* Start stage of colour curve control
*
* @param use_screen The screen to use
* @return Zero on success
*/
int blueshift_randr_open(int use_screen)
{
blueshift_randr_crtc_t* crtcs_;
xcb_randr_query_version_cookie_t version_cookie;
xcb_randr_query_version_reply_t* randr_version;
const xcb_setup_t* setup;
xcb_screen_iterator_t iter;
xcb_screen_t* screen;
xcb_randr_get_screen_resources_current_cookie_t res_cookie;
unsigned int crtc_count;
xcb_randr_get_crtc_gamma_size_cookie_t gamma_size_cookie;
xcb_randr_get_crtc_gamma_size_reply_t* gamma_size_reply;
xcb_randr_get_crtc_gamma_cookie_t gamma_get_cookie;
xcb_randr_get_crtc_gamma_reply_t* gamma_get_reply;
/* Get X connection */
connection = xcb_connect(NULL, &use_screen);
/* Check RandR protocol version */
version_cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
randr_version = xcb_randr_query_version_reply(connection, version_cookie, &error);
if (error || (randr_version == NULL))
{
fprintf(stderr, "RandR version query returned %i\n", error ? error->error_code : -1);
xcb_disconnect(connection);
return 1;
}
if (randr_version->major_version != RANDR_VERSION_MAJOR || randr_version->minor_version < RANDR_VERSION_MINOR)
{
fprintf(stderr, "Unsupported RandR version, got %u.%u, expected %u.%u\n",
randr_version->major_version, randr_version->minor_version,
RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
free(randr_version);
xcb_disconnect(connection);
return 1;
}
free(randr_version);
/* Get X resources */
setup = xcb_get_setup(connection);
iter = xcb_setup_roots_iterator(setup);
screen = iter.data;
res_cookie = xcb_randr_get_screen_resources_current(connection, screen->root);
res_reply = xcb_randr_get_screen_resources_current_reply(connection, res_cookie, &error);
if (error)
{
fprintf(stderr, "RandR screen resource query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
/* Get CRTC:s */
crtc_count = res_reply->num_crtcs;
crtcs = malloc(crtc_count * sizeof(blueshift_randr_crtc_t));
crtcs->crtc = xcb_randr_get_screen_resources_current_crtcs(res_reply);
crtcs_end = crtcs + crtc_count;
/* Prepare CRTC:s */
for (crtcs_ = crtcs; crtcs_ != crtcs_end; crtcs_++)
{
/* Set CRTC */
if (crtcs_ != crtcs)
crtcs_->crtc = (crtcs_ - 1)->crtc + 1;
/* Get curve X-axis size */
gamma_size_cookie = xcb_randr_get_crtc_gamma_size(connection, *(crtcs_->crtc));
gamma_size_reply = xcb_randr_get_crtc_gamma_size_reply(connection, gamma_size_cookie, &error);
if (error)
{
fprintf(stderr, "RandR CRTC gamma size query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
crtcs_->curve_size = gamma_size_reply->size;
free(gamma_size_reply);
/* Acquire curve control */
gamma_get_cookie = xcb_randr_get_crtc_gamma(connection, *(crtcs_->crtc));
gamma_get_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_get_cookie, &error);
if (error)
{
fprintf(stderr, "RandR CRTC gamma query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
free(gamma_get_reply);
}
return 0;
}
/**
* Gets the current colour curves
*
* @param use_crtc The CRTC to use
* @return {the size of the red curve, *the red curve,
* the size of the green curve, *the green curve,
* the size of the blue curve, *the blue curve},
* needs to be free:d. `NULL` on error.
*/
uint16_t* blueshift_randr_read(int use_crtc)
{
xcb_randr_get_crtc_gamma_cookie_t gamma_get_cookie;
xcb_randr_get_crtc_gamma_reply_t* gamma_get_reply;
uint16_t* r_gamma, * R_gamma;
uint16_t* g_gamma, * G_gamma;
uint16_t* b_gamma, * B_gamma;
int i, R_size, G_size, B_size;
/* Read curves */
gamma_get_cookie = xcb_randr_get_crtc_gamma(connection, *((crtcs + use_crtc)->crtc));
gamma_get_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_get_cookie, &error);
if (error)
{
fprintf(stderr, "RandR CRTC gamma query returned %i\n", error->error_code);
xcb_disconnect(connection);
return NULL;
}
R_size = xcb_randr_get_crtc_gamma_red_length(gamma_get_reply);
G_size = xcb_randr_get_crtc_gamma_green_length(gamma_get_reply);
B_size = xcb_randr_get_crtc_gamma_blue_length(gamma_get_reply);
R_gamma = xcb_randr_get_crtc_gamma_red(gamma_get_reply);
G_gamma = xcb_randr_get_crtc_gamma_green(gamma_get_reply);
B_gamma = xcb_randr_get_crtc_gamma_blue(gamma_get_reply);
r_gamma = malloc((3 + R_size + G_size + B_size) * sizeof(uint16_t));
g_gamma = r_gamma + R_size + 1;
b_gamma = g_gamma + G_size + 1;
if (r_gamma == NULL)
{
fprintf(stderr, "Out of memory\n");
free(gamma_get_reply);
xcb_disconnect(connection);
return NULL;
}
*r_gamma++ = R_size;
*g_gamma++ = G_size;
*b_gamma++ = B_size;
for (i = 0; i < R_size; i++) *(r_gamma + i) = *(R_gamma + i);
for (i = 0; i < G_size; i++) *(g_gamma + i) = *(G_gamma + i);
for (i = 0; i < B_size; i++) *(b_gamma + i) = *(B_gamma + i);
free(gamma_get_reply);
return r_gamma - 1;
}
/**
* 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_randr_apply(uint64_t use_crtcs, uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve)
{
blueshift_randr_crtc_t* crtcs_ = crtcs;
xcb_void_cookie_t gamma_set_cookie;
/* Use CRTC:s */
while (crtcs_ != crtcs_end)
{
/* Check whether we should use the CRTC */
if ((use_crtcs & 1) == 0)
goto next_crtc;
/* Apply curves */
gamma_set_cookie = xcb_randr_set_crtc_gamma_checked(connection, *(crtcs_->crtc), crtcs_->curve_size,
r_curve, g_curve, b_curve);
error = xcb_request_check(connection, gamma_set_cookie);
if (error)
{
fprintf(stderr, "RandR CRTC control returned %i\n", error->error_code);
return 1;
}
/* Next CRTC */
next_crtc:
crtcs_++;
use_crtcs >>= 1;
}
return 0;
}
/**
* Resource freeing stage of colour curve control
*/
void blueshift_randr_close(void)
{
/* Free remaining resources */
free(crtcs);
free(res_reply);
xcb_disconnect(connection);
}
