/**
* cg-tools -- Cooperative gamma-enabled tools
* 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 <libcoopgamma.h>
#include <inttypes.h>
/**
* Value of `default_priority` that indicates
* that there is no default priority
*/
#define NO_DEFAULT_PRIORITY INT64_MAX
/**
* X-macro that list all gamma ramp types
*
* X will be expanded with 4 arguments:
* 1) The libcoopgamma constant that identifies the type
* 2) The member in `union libcoopgamma_ramps` that
* corresponds to the type
* 3) The max value for the ramp stops
* 4) The type of the ramp stops
*/
#define LIST_DEPTHS\
X(LIBCOOPGAMMA_UINT8, u8, UINT8_MAX, uint8_t)\
X(LIBCOOPGAMMA_UINT16, u16, UINT16_MAX, uint16_t)\
X(LIBCOOPGAMMA_UINT32, u32, UINT32_MAX, uint32_t)\
X(LIBCOOPGAMMA_UINT64, u64, UINT64_MAX, uint64_t)\
X(LIBCOOPGAMMA_FLOAT, f, ((float)1), float)\
X(LIBCOOPGAMMA_DOUBLE, d, ((double)1), double)
/**
* Information (except asynchronous call context)
* required to update the gamma ramps on a CRTC.
*/
typedef struct filter_update
{
/**
* The filter to update
*
* `.filter.crtc`, `.filter.class`, and
* `.filter.priority` (unless `default_priority`
* is `NO_DEFAULT_PRIORITY`), `.filter.depth`
* are preconfigured, and `.filter.ramps`
* is preinitialised and preset to an
* identity ramp
*/
libcoopgamma_filter_t filter;
/**
* Has the update been synchronised?
*/
int synced;
/**
* Did the update fail?
*/
int failed;
/**
* Error description if `.failed` is true
*/
libcoopgamma_error_t error;
/**
* If zero, the ramps in `.filter` shall
* neither be modified nor freed
*/
int master;
/**
* 0-terminated list of elements in
* `.crtc_updates` which shares gamma
* ramps with this instance
*
* This will only be set if `.master`
* is true
*/
size_t* slaves;
} filter_update_t;
/**
* The process's name
*/
extern const char* argv0;
/**
* The libcoopgamma context
*/
extern libcoopgamma_context_t cg;
/**
* The names of the selected CRTC:s
*/
extern char** crtcs;
/**
* Gamma ramp updates for each CRTC
*/
extern filter_update_t* crtc_updates;
/**
* CRTC and monitor information about
* each selected CRTC and connect monitor
*/
extern libcoopgamma_crtc_info_t* crtc_info;
/**
* The number of selected CRTC:s
*/
extern size_t crtcs_n;
/**
* The default filter priority for the program
*/
extern const int64_t default_priority;
/**
* The default class for the program
*/
extern char default_class[];
/**
* Make elements in `crtc_updates` slaves where appropriate
*
* @return Zero on success, -1 on error
*/
int make_slaves(void);
/**
* Update a filter and synchronise calls
*
* @param index The index of the CRTC
* @param timeout The number of milliseconds a call to `poll` may block,
* -1 if it may block forever
* @return 1: Success, no pending synchronisations
* 0: Success, with still pending synchronisations
* -1: Error, `errno` set
* -2: Error, `cg.error` set
*
* @throws EINTR Call to `poll` was interrupted by a signal
* @throws EAGAIN Call to `poll` timed out
*/
int update_filter(size_t index, int timeout);
/**
* Synchronised calls
*
* @param timeout The number of milliseconds a call to `poll` may block,
* -1 if it may block forever
* @return 1: Success, no pending synchronisations
* 0: Success, with still pending synchronisations
* -1: Error, `errno` set
* -2: Error, `cg.error` set
*
* @throws EINTR Call to `poll` was interrupted by a signal
* @throws EAGAIN Call to `poll` timed out
*/
int synchronise(int timeout);
/**
* Print usage information and exit
*/
#if defined(__GNUC__)
__attribute__((__noreturn__))
#endif
extern void usage(void);
/**
* Handle a command line option
*
* @param opt The option, it is a NUL-terminate two-character
* string starting with either '-' or '+', if the
* argument is not recognised, call `usage`. This
* string will not be "-M", "-S", "-c", "-p", or "-R".
* @param arg The argument associated with `opt`,
* `NULL` there is no next argument, if this
* parameter is `NULL` but needed, call `usage`
* @return 0 if `arg` was not used,
* 1 if `arg` was used,
* -1 on error
*/
#if defined(__GNUC__)
__attribute__((__nonnull__(1)))
#endif
extern int handle_opt(char* opt, char* arg);
/**
* This function is called after the last
* call to `handle_opt`
*
* @param argc The number of unparsed arguments
* @param argv `NULL` terminated list of unparsed arguments
* @param prio The argument associated with the "-p" option
* @return Zero on success, -1 on error
*/
#if defined(__GNUC__)
__attribute__((__nonnull__(2)))
#endif
extern int handle_args(int argc, char* argv[], char* prio);
/**
* The main function for the program-specific code
*
* @return 0: Success
* -1: Error, `errno` set
* -2: Error, `cg.error` set
* -3: Error, message already printed
*/
extern int start(void);
