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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/>.
*/
#include <stddef.h>
#include <stdint.h>
#ifndef GCC_ONLY
# if defined(__GNUC__) && !defined(__clang__)
# define GCC_ONLY(...) __VA_ARGS__
# else
# define GCC_ONLY(...) /* nothing */
# endif
#endif
/**
* The lifespan of a filter
*/
enum lifespan
{
/**
* The filter should be applied
* until it is explicitly removed
*/
LIFESPAN_UNTIL_REMOVAL,
/**
* The filter should be applied
* until the client exists
*/
LIFESPAN_UNTIL_DEATH,
/**
* The filter should be removed now
*/
LIFESPAN_REMOVE
};
/**
* Information about a filter
*/
struct filter
{
/**
* The client that applied it. This need not be
* set unless `.lifespan == LIFESPAN_UNTIL_DEATH`
* and unless the process itself added this.
* This is the file descriptor of the client's
* connection.
*/
int client;
/**
* The lifespan of the filter
*/
enum lifespan lifespan;
/**
* The priority of the filter
*/
int64_t priority;
/**
* Identifier for the filter
*/
char* class;
/**
* The gamma ramp adjustments for the filter.
* This is raw binary data. `NULL` iff
* `lifespan == LIFESPAN_REMOVE`.
*/
void* ramps;
};
/**
* Free all resources allocated to a filter.
* The allocation of `filter` itself is not freed.
*
* @param this The filter
*/
GCC_ONLY(__attribute__((nonnull)))
void filter_destroy(struct filter* restrict this);
/**
* Marshal a filter
*
* @param this The filter
* @param buf Output buffer for the marshalled filter,
* `NULL` just measure how large the buffers
* needs to be
* @param ramps_size The byte-size of `filter->ramps`
* @return The number of marshalled byte
*/
GCC_ONLY(__attribute__((nonnull(1))))
size_t filter_marshal(const struct filter* restrict this, void* restrict buf, size_t ramps_size);
/**
* Unmarshal a filter
*
* @param this Output for the filter, `.red_size`, `.green_size`,
* and `.blue_size` must already be set
* @param buf Buffer with the marshalled filter
* @param ramps_size The byte-size of `filter->ramps`
* @return The number of unmarshalled bytes, 0 on error
*/
GCC_ONLY(__attribute__((nonnull)))
size_t filter_unmarshal(struct filter* restrict this, const void* restrict buf, size_t ramps_size);
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