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/**
* crt-calibrator – Calibration utility for CRT monitors
* 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/>.
*/
#ifndef CRT_CALIBRATOR_DRMGAMMA_H
#define CRT_CALIBRATOR_DRMGAMMA_H
#include <xf86drm.h>
#include <xf86drmMode.h>
/**
* Graphics card information
*/
typedef struct drm_card
{
/**
* File descriptor for the connection to the graphics card,
* -1 if not opened
*/
int fd;
/**
* The graphics card's mode resources, `NULL` if not acquired
*/
drmModeRes* restrict res;
/**
* The number of CRTC:s available on the graphics card
*/
size_t crtc_count;
/**
* The available connectors
*/
drmModeConnector** restrict connectors;
/**
* The available encoders
*/
drmModeEncoder** restrict encoders;
/**
* The number of connectors and encoders
*/
size_t connector_count;
} drm_card_t;
/**
* CRT controller information
*/
typedef struct drm_crtc
{
/**
* CRT controller identifier
*/
uint32_t id;
/**
* The graphics card
*/
drm_card_t* restrict card;
/**
* The CRT controller's connector
*/
drmModeConnector* restrict connector;
/**
* The CRT controller's encoder
*/
drmModeEncoder* restrict encoder;
/**
* Whether the connector is connected
*/
int connected;
/**
* The CRT's EDID, hexadecimally encoded
*/
char* restrict edid;
/**
* The number of stops on the gamma ramps
*/
size_t gamma_stops;
/**
* The gamma ramp for the red channel
*/
uint16_t* restrict red;
/**
* The gamma ramp for the green channel
*/
uint16_t* restrict green;
/**
* The gamma ramp for the blue channel
*/
uint16_t* restrict blue;
} drm_crtc_t;
/**
* Figure out how many graphics cards there are on the system
*
* @return The number of graphics cards on the system
*/
size_t drm_card_count(void);
/**
* Acquire access to a graphics card
*
* @param index The index of the graphics card
* @param card Graphics card information to fill in
* @return Zero on success, -1 on error
*/
int drm_card_open(size_t index, drm_card_t* restrict card);
/**
* Release access to a graphics card
*
* @param card The graphics card information
*/
void drm_card_close(drm_card_t* restrict card);
/**
* Acquire access to a CRT controller
*
* @param index The index of the CRT controller
* @param card The graphics card information
* @param crtc CRT controller information to fill in
* @return Zero on success, -1 on error
*/
int drm_crtc_open(size_t index, drm_card_t* restrict card, drm_crtc_t* restrict crtc);
/**
* Release access to a CRT controller
*
* @param crtc The CRT controller information to fill in
*/
void drm_crtc_close(drm_crtc_t* restrict crtc);
/**
* Read the gamma ramps for a CRT controller
*
* @param crtc CRT controller information
* @return Zero on success, -1 on error
*/
int drm_get_gamma(drm_crtc_t* restrict crtc);
/**
* Apply gamma ramps for a CRT controller
*
* @param crtc CRT controller information
* @return Zero on success, -1 on error
*/
int drm_set_gamma(drm_crtc_t* restrict crtc);
#endif
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