/**
* 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;
}
}
/**
* 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
* @param return_errno Whether an `errno` value may be returned
* @return The libgamma error
*/
static int translate_error(int error_code, int default_error, int return_errno)
{
int r = translate_error_(error_code, default_error);
return return_errno ? (r > 0 ? errno : r) : r;
}
/**
* 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, 0);
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, 0);
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)
{
xcb_randr_crtc_t* crtc_ids = partition->data;
if (crtc >= partition->crtcs_available)
return LIBGAMMA_NO_SUCH_CRTC;
this->data = crtc_ids + crtc;
return 0;
}
/**
* 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;
}
/**
* Get the gamma ramp size of 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
* @return Non-zero on error
*/
static int get_gamma_ramp_size(libgamma_crtc_information_t* restrict out, libgamma_crtc_state_t* restrict crtc)
{
xcb_connection_t* restrict connection = crtc->partition->site->data;
xcb_randr_crtc_t* restrict crtc_id = crtc->data;
xcb_randr_get_crtc_gamma_size_cookie_t cookie;
xcb_randr_get_crtc_gamma_size_reply_t* reply;
xcb_generic_error_t* error;
out->gamma_size_error = 0;
cookie = xcb_randr_get_crtc_gamma_size(connection, *crtc_id);
reply = xcb_randr_get_crtc_gamma_size_reply(connection, cookie, &error);
if (error != NULL)
return out->gamma_size_error = translate_error(error->error_code, LIBGAMMA_GAMMA_RAMPS_SIZE_QUERY_FAILED, 1);
if (reply->size < 2)
out->gamma_size_error = LIBGAMMA_SINGLETON_GAMMA_RAMP;
out->red_gamma_size = out->green_gamma_size = out->blue_gamma_size = reply->size;
free(reply);
return out->gamma_size_error;
}
/**
* Read information from the CRTC's output
*
* @param out Instance of a data structure to fill with the information about the CRTC
* @param output The CRTC's output information
* @return Non-zero if at least on error occured
*/
static int read_output_data(libgamma_crtc_information_t* restrict out, xcb_randr_get_output_info_reply_t* restrict output)
{
switch (output->connection)
{
case XCB_RANDR_CONNECTION_CONNECTED:
out->active = 1;
out->width_mm = output->mm_width;
out->height_mm = output->mm_height;
#define __select(value) \
case XCB_RENDER_SUB_PIXEL_##value: out->subpixel_order = LIBGAMMA_SUBPIXEL_ORDER_##value; break
switch (output->subpixel_order)
{
__select (UNKNOWN);
__select (HORIZONTAL_RGB);
__select (HORIZONTAL_BGR);
__select (VERTICAL_RGB);
__select (VERTICAL_BGR);
__select (NONE);
default:
out->subpixel_order_error = LIBGAMMA_SUBPIXEL_ORDER_NOT_RECOGNISED;
break;
}
#undef __select
return 0;
case XCB_RANDR_CONNECTION_DISCONNECTED:
out->active = 0;
out->width_mm_error = LIBGAMMA_NOT_CONNECTED;
out->height_mm_error = LIBGAMMA_NOT_CONNECTED;
out->subpixel_order_error = LIBGAMMA_NOT_CONNECTED;
return 0;
default:
out->active = 0;
out->active_error = LIBGAMMA_STATE_UNKNOWN;
out->width_mm_error = LIBGAMMA_NOT_CONNECTED;
out->height_mm_error = LIBGAMMA_NOT_CONNECTED;
out->subpixel_order_error = LIBGAMMA_NOT_CONNECTED;
return -1;
}
}
/**
* Determine the connector type from the connector name
*
* @param this The CRTC information to use and extend
* @param Non-zero on error
*/
static int get_connector_type(libgamma_crtc_information_t* restrict this)
{
if ((this->connector_type_error = this->connector_name_error))
return -1;
#define __select(name, type) \
if (strstr(this->connector_name, name "-") == this->connector_name) \
return this->connector_type = LIBGAMMA_CONNECTOR_TYPE_##type, 0
__select ("None", Unknown);
__select ("VGA", VGA);
__select ("DVI-I", DVII);
__select ("DVI-D", DVID);
__select ("DVI-A", DVIA);
__select ("Composite", Composite);
__select ("S-Video", SVIDEO);
__select ("Component", Component);
__select ("LFP", LFP);
__select ("Proprietary", Unknown);
__select ("HDMI", HDMI);
__select ("DisplayPort", DisplayPort);
#undef __select
this->connector_name_error = LIBGAMMA_CONNECTOR_TYPE_NOT_RECOGNISED;
return -1;
}
/**
* Get the output name of a CRTC
*
* @param this Instance of a data structure to fill with the information about the CRTC
* @param output The CRTC's output's information
* @return Non-zero on error
*/
static int get_output_name(libgamma_crtc_information_t* restrict out, xcb_randr_get_output_info_reply_t* restrict output)
{
char* store;
uint8_t* name;
uint16_t length;
size_t i;
name = xcb_randr_get_output_info_name(output);
length = output->name_len; /* There is no NUL-termination. */
if (name == NULL)
{
out->connector_name_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED;
return -1;
}
store = malloc(((size_t)length + 1) * sizeof(char));
if (store == NULL)
{
out->connector_name_error = errno;
return -1;
}
/* char is guaranteed to be (u)int_least8_t, but it is only guaranteed to be (u)int8_t
* on POSIX, so to be truly portable we will not assume that char is (u)int8_t. */
for (i = 0; i < (size_t)length; i++)
store[i] = (char)(name[i]);
store[length] = '\0';
return 0;
}
/**
* Get the Extended Display Information Data of the monitor connected to the connector of a CRTC
*
* @param out 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 output The CRTC's output
* @return Non-zero on error
*/
static int get_edid(libgamma_crtc_information_t* restrict out,
libgamma_crtc_state_t* restrict crtc, xcb_randr_output_t output)
{
xcb_connection_t* connection = crtc->partition->site->data;
xcb_randr_list_output_properties_cookie_t prop_cookie;
xcb_randr_list_output_properties_reply_t* prop_reply;
xcb_atom_t* atoms;
xcb_atom_t* atoms_end;
xcb_generic_error_t* error;
/* Acquire a list of all properties of the output. */
prop_cookie = xcb_randr_list_output_properties(connection, output);
prop_reply = xcb_randr_list_output_properties_reply(connection, prop_cookie, &error);
if (error != NULL)
return out->edid_error = translate_error(error->error_code, LIBGAMMA_LIST_PROPERTIES_FAILED, 1);
/* Extract the properties form the data structure that holds them, */
atoms = xcb_randr_list_output_properties_atoms(prop_reply);
/* and get the last one so that we can iterate over them nicely. */
atoms_end = atoms + xcb_randr_list_output_properties_atoms_length(prop_reply);
if (atoms == NULL)
{
free(prop_reply);
return out->edid_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED;;
}
/* For each property */
for (; atoms != atoms_end; atoms++)
{
xcb_get_atom_name_cookie_t atom_name_cookie;
xcb_get_atom_name_reply_t* atom_name_reply;
char* atom_name;
int atom_name_len;
xcb_randr_get_output_property_cookie_t atom_cookie;
xcb_randr_get_output_property_reply_t* atom_reply;
unsigned char* atom_data;
int length;
/* Acquire the atom name. */
atom_name_cookie = xcb_get_atom_name(connection, *atoms);
atom_name_reply = xcb_get_atom_name_reply(connection, atom_name_cookie, &error);
if (error)
continue;
/* Extract the atom name from the data structure that holds it. */
atom_name = xcb_get_atom_name_name(atom_name_reply);
/* As well as the length of the name; it is not NUL-termianted.*/
atom_name_len = xcb_get_atom_name_name_length(atom_name_reply);
if (/* Check for errors. */
(atom_name == NULL) || /* (atom_name_len < 1) || */
/* Check that the length is the expected length for the EDID property. */
(atom_name_len != 4) ||
/* Check that the property is the EDID property. */
(atom_name[0] != 'E') || (atom_name[1] != 'D') || (atom_name[2] != 'I') || (atom_name[3] != 'D'))
{
free(atom_name_reply);
continue;
}
/* Acquire the property's value, we know that it is either 128 or 256 byte long. */
atom_cookie = xcb_randr_get_output_property(connection, output, *atoms,
XCB_GET_PROPERTY_TYPE_ANY, 0, 256, 0, 0);
atom_reply = xcb_randr_get_output_property_reply(connection, atom_cookie, &error);
/* (*) EDID version 1.0 through 1.4 define it as 128 bytes long,
* but version 2.0 define it as 256 bytes long. However,
* version 2.0 is rare(?) and has been deprecated and replaced
* by version 1.3 (I guess that is with a new version epoch,
* but I do not know.) */
if (error)
{
free(atom_name_reply);
free(prop_reply);
return out->edid_error = LIBGAMMA_PROPERTY_VALUE_QUERY_FAILED;
}
/* Extract the property's value, */
atom_data = xcb_randr_get_output_property_data(atom_reply);
/* and its actual length. */
length = xcb_randr_get_output_property_data_length(atom_reply);
if ((atom_data == NULL) || (length < 1))
{
free(atom_reply);
free(atom_name_reply);
free(prop_reply);
return out->edid_error = LIBGAMMA_REPLY_VALUE_EXTRACTION_FAILED;
}
/* Store the EDID. */
out->edid = malloc((size_t)length * sizeof(unsigned char));
if (out->edid == NULL)
out->edid_error = errno;
else
memcpy(out->edid, atom_data, (size_t)length * sizeof(unsigned char));
free(atom_reply);
free(atom_name_reply);
free(prop_reply);
return out->edid_error;
}
return out->edid_error = LIBGAMMA_EDID_NOT_FOUND;
}
/**
* 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)
{
#define _E(FIELD) ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0)
int e = 0;
int free_edid;
/* Wipe all error indicators. */
memset(this, 0, sizeof(libgamma_crtc_information_t));
/* We need to free the EDID after us if it is not explicitly requested. */
free_edid = (fields & CRTC_INFO_EDID) == 0;
/* Figure out what fields we need to get the data for to get the data for other fields. */
if ((fields & (CRTC_INFO_WIDTH_MM_EDID | CRTC_INFO_HEIGHT_MM_EDID | CRTC_INFO_GAMMA)))
fields |= CRTC_INFO_EDID;
if ((fields & CRTC_INFO_CONNECTOR_TYPE))
fields |= CRTC_INFO_CONNECTOR_NAME;
if ((fields & (CRTC_INFO_WIDTH_MM | CRTC_INFO_HEIGHT_MM | CRTC_INFO_SUBPIXEL_ORDER)))
fields |= CRTC_INFO_ACTIVE;
/* Jump if the output information is not required. */
if ((fields & (CRTC_INFO_ACTIVE | CRTC_INFO_CONNECTOR_NAME)) == 0)
goto cont;
/* FIXME output */
e |= get_output_name(this, output_info);
if ((fields & CRTC_INFO_CONNECTOR_TYPE))
e |= get_connector_type(this);
e |= read_output_data(this, output_info);
if ((fields & (CRTC_INFO_WIDTH_MM | CRTC_INFO_HEIGHT_MM)))
e |= this->width_mm_error | this->height_mm_error;
e |= (fields & CRTC_INFO_SUBPIXEL_ORDER) ? this->subpixel_order_error : 0;
if ((fields & CRTC_INFO_EDID) == 0)
goto cont;
if (this->active == 0)
{
e |= this->edid_error = this->gamma_error = this->width_mm_edid_error
= this->height_mm_edid_error = LIBGAMMA_NOT_CONNECTED;
goto cont;
}
e |= get_edid(this, crtc, output);
if (this->edid == NULL)
{
this->gamma_error = this->width_mm_edid_error = this->height_mm_edid_error = this->edid_error;
goto cont;
}
if ((fields & (CRTC_INFO_WIDTH_MM_EDID | CRTC_INFO_HEIGHT_MM_EDID | CRTC_INFO_GAMMA)))
e |= libgamma_parse_edid(this, fields);
cont:
e |= (fields & CRTC_INFO_GAMMA_SIZE) ? get_gamma_ramp_size(this, crtc) : 0;
this->gamma_depth = 16;
e |= this->gamma_support_error = _E(CRTC_INFO_GAMMA_SUPPORT);
/* Free the EDID after us. */
if (free_edid)
{
free(this->edid);
this->edid = NULL;
}
free(output);
return e ? -1 : 0;
#undef _E
}
/**
* 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, 0);
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, 0);
return 0;
}
# pragma GCC diagnostic pop
