/**
* 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 <libgamma.h>
#include "ramps.h"
#include "filter.h"
#ifndef GCC_ONLY
# if defined(__GNUC__) && !defined(__clang__)
# define GCC_ONLY(...) __VA_ARGS__
# else
# define GCC_ONLY(...) /* nothing */
# endif
#endif
/**
* Copy the ramp sizes
*
* This macro supports both `struct output`
* and `struct gamma_ramps`
*
* @param dest The destination
* @param src The source
*/
#define COPY_RAMP_SIZES(dest, src) \
((dest)->red_size = (src)->red_size, \
(dest)->green_size = (src)->green_size, \
(dest)->blue_size = (src)->blue_size)
/**
* Information about an output
*/
struct output
{
/**
* -2: double
* -1: float
* 8: uint8_t
* 16: uint16_t
* 32: uint32_t
* 64: uint64_t
*/
signed depth;
/**
* Whether gamma ramps are supported
*/
enum libgamma_decision supported;
/**
* The number of stops in the red gamma ramp
*/
size_t red_size;
/**
* The number of stops in the green gamma ramp
*/
size_t green_size;
/**
* The number of stops in the blue gamma ramp
*/
size_t blue_size;
/**
* `.red_size + .green_size + .blue_size`
* multiplied by the byte-size of each stop
*/
size_t ramps_size;
/**
* The name of the output, will be its EDID
* if available, otherwise it will be the
* index of the partition, followed by a dot
* and the index of the CRTC within the
* partition, or if a name for the connector
* is available: the index of the partition
* followed by a dot and the name of the
* connector
*/
char* restrict name;
/**
* The libgamma state for the output
*/
libgamma_crtc_state_t* restrict crtc;
/**
* Saved gamma ramps
*/
union gamma_ramps saved_ramps;
/**
* The table of all applied filters
*/
struct filter* restrict table_filters;
/**
* `.table_sums[i]` is the resulting
* adjustment made when all filter
* from `.table_filters[0]` up to and
* including `.table_filters[i]` has
* been applied
*/
union gamma_ramps* restrict table_sums;
/**
* The number of elements allocated
* for `.table_filters` and for `.table_sums`
*/
size_t table_alloc;
/**
* The number of elements stored in
* `.table_filters` and in `.table_sums`
*/
size_t table_size;
};
/**
* Free all resources allocated to an output.
* The allocation of `output` itself is not freed,
* nor is its the libgamma destroyed.
*
* @param this The output
*/
GCC_ONLY(__attribute__((nonnull)))
void output_destroy(struct output* restrict this);
/**
* Marshal an output
*
* @param this The output
* @param buf Output buffer for the marshalled output,
* `NULL` just measure how large the buffers
* needs to be
* @return The number of marshalled byte
*/
GCC_ONLY(__attribute__((nonnull(1))))
size_t output_marshal(const struct output* restrict this, void* restrict buf);
/**
* Unmarshal an output
*
* @param this Output for the output
* @param buf Buffer with the marshalled output
* @return The number of unmarshalled bytes, 0 on error
*/
GCC_ONLY(__attribute__((nonnull)))
size_t output_unmarshal(struct output* restrict this, const void* restrict buf);
/**
* Compare to outputs by the names of their respective CRTC:s
*
* @param a Return -1 if this one is lower
* @param b Return +1 if this one is higher
* @return See description of `a` and `b`,
* 0 if returned if they are the same
*/
GCC_ONLY(__attribute__((pure, nonnull)))
int output_cmp_by_name(const void* restrict a, const void* restrict b);
/**
* Find an output by its name
*
* @param key The name of the output
* @param base The array of outputs
* @param n The number of elements in `base`
* @return Output find in `base`, `NULL` if not found
*/
GCC_ONLY(__attribute__((pure, nonnull)))
struct output* output_find_by_name(const char* restrict key, struct output* restrict base, size_t n);
/**
* Add a filter to an output
*
* @param output The output
* @param filter The filter
* @return The index given to the filter, -1 on error
*/
GCC_ONLY(__attribute__((nonnull)))
ssize_t add_filter(struct output* restrict output, struct filter* restrict filter);
/**
* 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);
/**
* Make identity mapping ramps
*
* @param ramps Output parameter for the ramps
* @param output The output for which the ramps shall be configured
* @return Zero on success, -1 on error
*/
GCC_ONLY(__attribute__((nonnull)))
int make_plain_ramps(union gamma_ramps* restrict ramps, struct output* restrict output);
