/**
* libgamma -- Display server abstraction layer for gamma ramp adjustments
* Copyright (C) 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 LIBGAMMA_GAMMA_X_RANDR_H
#define LIBGAMMA_GAMMA_X_RANDR_H
#ifndef HAVE_LIBGAMMA_METHOD_X_RANDR
# error Including gamma-x-randr.h without HAVE_LIBGAMMA_METHOD_X_RANDR
#endif
#include "libgamma-method.h"
/**
* 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);
/**
* 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);
/**
* 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);
/**
* Restore the gamma ramps all CRTC:s 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);
/**
* 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);
/**
* 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);
/**
* Restore the gamma ramps all CRTC:s 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);
/**
* 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);
/**
* 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) __attribute__((const));
/**
* 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);
/**
* 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);
/**
* Get the current 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_ramps16(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps16_t* restrict ramps);
/**
* 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_ramps16(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps16_t ramps);
#endif
