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/**
* coopgammad -- Cooperative gamma server
* Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
*
* 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 SERVERS_COOPGAMMA_H
#define SERVERS_COOPGAMMA_H
#include "../types/output.h"
#include <stddef.h>
#ifndef GCC_ONLY
# if defined(__GNUC__) && !defined(__clang__)
# define GCC_ONLY(...) __VA_ARGS__
# else
# define GCC_ONLY(...) /* nothing */
# endif
#endif
/**
* Handle a closed connection
*
* @param client The file descriptor for the client
* @return Zero on success, -1 on error
*/
int connection_closed(int client);
/**
* Handle a ‘Command: get-gamma’ message
*
* @param conn The index of the connection
* @param message_id The value of the ‘Message ID’ header
* @param crtc The value of the ‘CRTC’ header
* @param coalesce The value of the ‘Coalesce’ header
* @param high_priority The value of the ‘High priority’ header
* @param low_priority The value of the ‘Low priority’ header
* @return Zero on success (even if ignored), -1 on error,
* 1 if connection closed
*/
GCC_ONLY(__attribute__((nonnull(2))))
int handle_get_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
const char* restrict coalesce, const char* restrict high_priority,
const char* restrict low_priority);
/**
* Handle a ‘Command: set-gamma’ message
*
* @param conn The index of the connection
* @param message_id The value of the ‘Message ID’ header
* @param crtc The value of the ‘CRTC’ header
* @param priority The value of the ‘Priority’ header
* @param class The value of the ‘Class’ header
* @param lifespan The value of the ‘Lifespan’ header
* @return Zero on success (even if ignored), -1 on error,
* 1 if connection closed
*/
GCC_ONLY(__attribute__((nonnull(2))))
int handle_set_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
const char* restrict priority, const char* restrict class, const char* restrict lifespan);
/**
* Recalculate the resulting gamma and
* update push the new gamma ramps to the CRTC
*
* @param output The output
* @param first_updated The index of the first added or removed filter
* @return Zero on success, -1 on error
*/
GCC_ONLY(__attribute__((nonnull)))
int flush_filters(struct output* restrict output, size_t first_updated);
/**
* Preserve current gamma ramps at priority 0 for all outputs
*
* @return Zero on success, -1 on error
*/
int preserve_gamma(void);
#endif
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