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/**
* 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 BLUESHIFT_RANDR_C_H
#define BLUESHIFT_RANDR_C_H
#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;
/**
* Start stage of colour curve control
*
* @param use_screen The screen to use
* @param display The display to use, `NULL` for the current one
* @return Zero on success
*/
int blueshift_randr_open(int use_screen, char* display);
/**
* 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);
/**
* 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);
/**
* Resource freeing stage of colour curve control
*/
void blueshift_randr_close(void);
#endif
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