/**
* libgamma — Display server abstraction layer for gamma ramp adjustments
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This library 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 library 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 library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef HAVE_GAMMA_METHOD_X_RANDR
# error Compiling gamma-x-randr.c without HAVE_GAMMA_METHOD_X_RANDR
#endif
#include "gamma-x-randr.h"
#include "libgamma-error.h"
#include "edid.h"
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdint.h>
#ifdef DEBUG
# include <stdio.h>
#endif
#include <xcb/xcb.h>
#include <xcb/randr.h>
/**
* The major version of RandR the library expects
*/
#define RANDR_VERSION_MAJOR 1
/**
* The minor version of RandR the library expects
*/
#define RANDR_VERSION_MINOR 3
/**
* Translate an xcb error into a libgamma error
*
* @param error_code The xcb error
* @param default_error The libgamma error to use if the xcb error is not recognised
* @return The libgamma error
*/
static int translate_error(int error_code, int default_error)
{
switch (error_code)
{
case XCB_CONN_ERROR: return errno = ECONNABORTED, LIBGAMMA_ERRNO_SET;
case XCB_CONN_CLOSED_EXT_NOTSUPPORTED: return errno = ENOPROTOOPT, LIBGAMMA_ERRNO_SET;
case XCB_CONN_CLOSED_MEM_INSUFFICIENT: return errno = ENOMEM, LIBGAMMA_ERRNO_SET;
case XCB_CONN_CLOSED_REQ_LEN_EXCEED: return errno = EMSGSIZE, LIBGAMMA_ERRNO_SET;
case XCB_CONN_CLOSED_PARSE_ERR: return LIBGAMMA_NO_SUCH_SITE;
case XCB_CONN_CLOSED_INVALID_SCREEN: return LIBGAMMA_NO_SUCH_PARTITION;
case XCB_CONN_CLOSED_FDPASSING_FAILED: return errno = EIO, LIBGAMMA_ERRNO_SET;
default:
return default_error;
}
}
/**
* Return the capabilities of the adjustment method
*
* @param this The data structure to fill with the method's capabilities
*/
void libgamma_x_randr_method_capabilities(libgamma_method_capabilities_t* restrict this)
{
char* display = getenv("DISPLAY");
this->crtc_information = CRTC_INFO_EDID
| CRTC_INFO_WIDTH_MM
| CRTC_INFO_HEIGHT_MM
| CRTC_INFO_WIDTH_MM_EDID
| CRTC_INFO_HEIGHT_MM_EDID
| CRTC_INFO_GAMMA_SIZE
| CRTC_INFO_GAMMA_DEPTH
| CRTC_INFO_SUBPIXEL_ORDER
| CRTC_INFO_CONNECTOR_NAME
| CRTC_INFO_CONNECTOR_TYPE
| CRTC_INFO_GAMMA;
this->default_site_known = (display && *display) ? 1 : 0;
this->multiple_sites = 1;
this->multiple_partitions = 1;
this->multiple_crtcs = 1;
this->partitions_are_graphics_cards = 0;
this->site_restore = 0;
this->partition_restore = 0;
this->crtc_restore = 0;
this->identical_gamma_sizes = 1;
this->fixed_gamma_size = 0;
this->fixed_gamma_depth = 1;
this->real = 1;
this->fake = 0;
}
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Waggregate-return"
/**
* Initialise an allocated site state
*
* @param this The site state to initialise
* @param site The site identifier, unless it is `NULL` it must a
* `free`:able. One the state is destroyed the library
* will attempt to free it. There you should not free
* it yourself, and it must not be a string constant
* or allocate on the stack. Note however that it will
* not be free:d if this function fails.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_site_initialise(libgamma_site_state_t* restrict this,
char* restrict site)
{
xcb_generic_error_t* error = NULL;
xcb_connection_t* connection;
xcb_randr_query_version_cookie_t cookie;
xcb_randr_query_version_reply_t* reply;
const xcb_setup_t* setup;
xcb_screen_iterator_t iter;
this->data = connection = xcb_connect(site, NULL);
if (connection == NULL)
return LIBGAMMA_NO_SUCH_SITE;
cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
reply = xcb_randr_query_version_reply(connection, cookie, &error);
if ((error != NULL) || (reply == NULL))
{
free(reply);
xcb_disconnect(connection);
if (error != NULL)
return translate_error(error->error_code, LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED);
return LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED;
}
if ((reply->major_version != RANDR_VERSION_MAJOR) ||
(reply->minor_version < RANDR_VERSION_MINOR))
{
#ifdef DEBUG
fprintf(stderr, "libgamma: RandR protocol version: %u.%u", reply->major_version, reply->minor_version);
#endif
free(reply);
xcb_disconnect(connection);
return LIBGAMMA_PROTOCOL_VERSION_NOT_SUPPORTED;
}
free(reply);
if ((setup = xcb_get_setup(connection)) == NULL)
{
xcb_disconnect(connection);
return LIBGAMMA_LIST_PARTITIONS_FAILED;
}
iter = xcb_setup_roots_iterator(setup);
this->partitions_available = (size_t)(iter.rem);
return iter.rem < 0 ? LIBGAMMA_NEGATIVE_PARTITION_COUNT : 0;
}
/**
* Release all resources held by a site state
*
* @param this The site state
*/
void libgamma_x_randr_site_destroy(libgamma_site_state_t* restrict this)
{
xcb_disconnect((xcb_connection_t*)(this->data));
}
/**
* Restore the gamma ramps all CRTCS with a site to the system settings
*
* @param this The site state
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_site_restore(libgamma_site_state_t* restrict this)
{
(void) this;
return errno = ENOTSUP, LIBGAMMA_ERRNO_SET;
}
/**
* Initialise an allocated partition state
*
* @param this The partition state to initialise
* @param site The site state for the site that the partition belongs to
* @param partition The the index of the partition within the site
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_partition_initialise(libgamma_partition_state_t* restrict this,
libgamma_site_state_t* restrict site, size_t partition)
{
xcb_connection_t* restrict connection = site->data;
const xcb_setup_t* setup = xcb_get_setup(connection);
xcb_screen_t* screen = NULL;
xcb_generic_error_t* error = NULL;
xcb_screen_iterator_t iter;
xcb_randr_get_screen_resources_current_cookie_t cookie;
xcb_randr_get_screen_resources_current_reply_t* reply;
xcb_randr_crtc_t* crtcs;
size_t i;
if (setup == NULL)
return LIBGAMMA_LIST_PARTITIONS_FAILED;
for (i = 0; iter.rem > 0; i++, xcb_screen_next(&iter))
if (i == partition)
{
screen = iter.data;
break;
}
if (iter.rem == 0)
return LIBGAMMA_NO_SUCH_PARTITION;
if (screen == NULL)
return LIBGAMMA_NULL_PARTITION;
cookie = xcb_randr_get_screen_resources_current(connection, screen->root);
reply = xcb_randr_get_screen_resources_current_reply(connection, cookie, &error);
if (error != NULL)
return translate_error(error->error_code, LIBGAMMA_LIST_CRTCS_FAILED);
this->crtcs_available = reply->num_crtcs;
crtcs = xcb_randr_get_screen_resources_current_crtcs(reply);
/* Copy the CRTC:s, just so we do not have to keep the reply in memory. */
this->data = malloc(reply->num_crtcs * sizeof(xcb_randr_crtc_t));
if (this->data == NULL)
{
free(reply);
return LIBGAMMA_ERRNO_SET;
}
memcpy(this->data, crtcs, reply->num_crtcs * sizeof(xcb_randr_crtc_t));
free(reply);
return 0;
}
/**
* Release all resources held by a partition state
*
* @param this The partition state
*/
void libgamma_x_randr_partition_destroy(libgamma_partition_state_t* restrict this)
{
free(this->data);
}
/**
* Restore the gamma ramps all CRTCS with a partition to the system settings
*
* @param this The partition state
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_partition_restore(libgamma_partition_state_t* restrict this)
{
(void) this;
return errno = ENOTSUP, LIBGAMMA_ERRNO_SET;
}
/**
* Initialise an allocated CRTC state
*
* @param this The CRTC state to initialise
* @param partition The partition state for the partition that the CRTC belongs to
* @param crtc The the index of the CRTC within the site
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_crtc_initialise(libgamma_crtc_state_t* restrict this,
libgamma_partition_state_t* restrict partition, size_t crtc)
{
/* TODO */
}
/**
* Release all resources held by a CRTC state
*
* @param this The CRTC state
*/
void libgamma_x_randr_crtc_destroy(libgamma_crtc_state_t* restrict this)
{
(void) this;
}
/**
* Restore the gamma ramps for a CRTC to the system settings for that CRTC
*
* @param this The CRTC state
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_crtc_restore(libgamma_crtc_state_t* restrict this)
{
(void) this;
return errno = ENOTSUP, LIBGAMMA_ERRNO_SET;
}
/**
* Read information about a CRTC
*
* @param this Instance of a data structure to fill with the information about the CRTC
* @param crtc The state of the CRTC whose information should be read
* @param fields OR:ed identifiers for the information about the CRTC that should be read
* @return Zero on success, -1 on error. On error refer to the error reports in `this`.
*/
int libgamma_x_randr_get_crtc_information(libgamma_crtc_information_t* restrict this,
libgamma_crtc_state_t* restrict crtc, int32_t fields)
{
/* TODO */
}
/**
* Get current the gamma ramps for a CRTC, 16-bit gamma-depth version
*
* @param this The CRTC state
* @param ramps The gamma ramps to fill with the current values
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_t* restrict ramps)
{
xcb_connection_t* restrict connection = this->partition->site->data;
xcb_randr_get_crtc_gamma_cookie_t cookie;
xcb_randr_get_crtc_gamma_reply_t* restrict reply;
xcb_generic_error_t* error;
uint16_t* restrict red;
uint16_t* restrict green;
uint16_t* restrict blue;
#ifdef DEBUG
if ((ramps->red_size != ramps->green_size) ||
(ramps->red_size != ramps->blue_size))
return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE;
#endif
cookie = xcb_randr_get_crtc_gamma(connection, *(xcb_randr_crtc_t*)(this->data));
reply = xcb_randr_get_crtc_gamma_reply(connection, cookie, &error);
if (error != NULL)
return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_READ_FAILED);
red = xcb_randr_get_crtc_gamma_red(reply);
green = xcb_randr_get_crtc_gamma_green(reply);
blue = xcb_randr_get_crtc_gamma_blue(reply);
memcpy(ramps->red, red, ramps->red_size * sizeof(uint16_t));
memcpy(ramps->green, green, ramps->green_size * sizeof(uint16_t));
memcpy(ramps->blue, blue, ramps->blue_size * sizeof(uint16_t));
free(reply);
return 0;
}
/**
* Set the gamma ramps for a CRTC, 16-bit gamma-depth version
*
* @param this The CRTC state
* @param ramps The gamma ramps to apply
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library
*/
int libgamma_x_randr_crtc_set_gamma_ramps(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_t ramps)
{
xcb_connection_t* restrict connection = this->partition->site->data;
xcb_void_cookie_t cookie;
xcb_generic_error_t* restrict error;
#ifdef DEBUG
if ((ramps.red_size != ramps.green_size) ||
(ramps.red_size != ramps.blue_size))
return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE;
#endif
cookie = xcb_randr_set_crtc_gamma_checked(connection, *(xcb_randr_crtc_t*)(this->data),
(uint16_t)(ramps.red_size), ramps.red, ramps.green, ramps.blue);
if ((error = xcb_request_check(connection, cookie)) != NULL)
return translate_error(error->error_code, LIBGAMMA_GAMMA_RAMP_WRITE_FAILED);
return 0;
}
# pragma GCC diagnostic pop
