# -*- python -*-
'''
1;2802;0cpylibcoopgamma -- Python library for interfacing with cooperative gamma servers
Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
1;2802;0c
This library 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 library 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 library. If not, see <http://www.gnu.org/licenses/>.
'''
cimport cython
from libc.stddef cimport size_t
from libc.stdlib cimport malloc, free
from libc.stdint cimport int64_t, uint8_t, uint16_t, uint32_t, uint64_t, intptr_t
from libc.errno cimport errno
ctypedef int libcoopgamma_support_t
# Values used to indicate the support for gamma adjustments
ctypedef int libcoopgamma_depth_t
# Values used to tell which datatype is used for the gamma ramp stops
#
# The values will always be the number of bits for integral types, and
# negative for floating-point types
ctypedef int libcoopgamma_lifespan_t
# Values used to tell when a filter should be removed
ctypedef int libcoopgamma_colourspace_t
# Colourspaces
cdef extern from "include-libcoopgamma.h":
ctypedef struct libcoopgamma_ramps_t:
# Gamma ramp structure
size_t red_size
# The number of stops in the red ramp
size_t green_size
# The number of stops in the green ramp
size_t blue_size
# The number of stops in the blue ramp
void* red
# The red ramp
void* green
# The green ramp
void* blue
# The blue ramp
ctypedef struct libcoopgamma_filter_t:
# Data set to the coopgamma server to apply, update, or remove a filter
int64_t priority
# The priority of the filter, higher priority is applied first.
# The gamma correction should have priority 0.
char* crtc
# The CRTC for which this filter shall be applied
char* fclass
# Identifier for the filter
#
# The syntax must be "${PACKAGE_NAME}::${COMMAND_NAME}::${RULE}"
libcoopgamma_lifespan_t lifespan
# When shall the filter be removed?
#
# If this member's value is `LIBCOOPGAMMA_REMOVE`,
# only `.crtc` and `.class` need also be defined
libcoopgamma_depth_t depth
# The data type and bit-depth of the ramp stops
libcoopgamma_ramps_t ramps
# The gamma ramp adjustments of the filter
ctypedef struct libcoopgamma_crtc_info_t:
# Gamma ramp meta information for a CRTC
int cooperative
# Is cooperative gamma server running?
libcoopgamma_depth_t depth
# The data type and bit-depth of the ramp stops
$$<cpp <<EOF | tail -n 1 | sed '/#/d'
#include <limits.h>
#if INT_MAX != LONG_MAX
int padding__
#endif
EOF
$$>
size_t red_size
# The number of stops in the red ramp
size_t green_size
# The number of stops in the green ramp
size_t blue_size
# The number of stops in the blue ramp
libcoopgamma_colourspace_t colourspace
# The monitor's colurspace
int have_gamut
# Whether `.red_x`, `.red_y`, `.green_x`, `.green_y`, `.blue_x`, `.blue_y`,
# `.white_x`, and `.white_y` are set.
#
# If this is true, but the colourspace is not RGB (or sRGB),
# there is something wrong. Please also check the colourspace.
unsigned red_x
# The x-value (CIE xyY) of the monitor's red colour, multiplied by 1024
unsigned red_y
# The y-value (CIE xyY) of the monitor's red colour, multiplied by 1024
unsigned green_x
# The x-value (CIE xyY) of the monitor's green colour, multiplied by 1024
unsigned green_y
# The y-value (CIE xyY) of the monitor's green colour, multiplied by 1024
unsigned blue_x
# The x-value (CIE xyY) of the monitor's blue colour, multiplied by 1024
unsigned blue_y
# The y-value (CIE xyY) of the monitor's blue colour, multiplied by 1024
unsigned white_x
# The x-value (CIE xyY) of the monitor's default white point, multiplied by 1024
unsigned white_y
# The y-value (CIE xyY) of the monitor's default white point, multiplied by 1024
ctypedef struct libcoopgamma_filter_query_t:
# Data sent to the coopgamma server when requestng the current filter table
int64_t high_priority
# Do no return filters with higher priority than this value
int64_t low_priority
# Do no return filters with lower priority than this value
char* crtc
# The CRTC for which the the current filters shall returned
int coalesce
# Whether to coalesce all filters into one gamma ramp triplet
$$<cpp <<EOF | tail -n 1 | sed '/#/d'
#include <limits.h>
#if INT_MAX != LONG_MAX
int padding__
#endif
EOF
$$>
ctypedef struct libcoopgamma_queried_filter_t:
# Stripped down version of `libcoopgamma_filter` which only contains
# the information returned in response to "Command: get-gamma"
int64_t priority
# The filter's priority
char* fclass
# The filter's class
libcoopgamma_ramps_t ramps
# The gamma ramp adjustments of the filter
ctypedef struct libcoopgamma_filter_table_t:
# Response type for "Command: get-gamma": a list of applied filters
# and meta-information that was necessary for decoding the response
size_t red_size
# The number of stops in the red ramp
size_t green_size
# The number of stops in the green ramp
size_t blue_size
# The number of stops in the blue ramp
size_t filter_count
# The number of filters
libcoopgamma_queried_filter_t* filters
# The filters, should be ordered by priority in descending order,
# lest there is something wrong with the coopgamma server
#
# If filter coalition was requested, there will be exactly one
# filter (`.filter_count == 1`) and `.filters->class == NULL`
# and `.filters->priority` is undefined.
libcoopgamma_depth_t depth
# The data type and bit-depth of the ramp stops
$$<cpp <<EOF | tail -n 1 | sed '/#/d'
#include <limits.h>
#if INT_MAX != LONG_MAX
int padding__
#endif
EOF
$$>
ctypedef struct libcoopgamma_error_t:
# Error message from coopgamma server
uint64_t number
# Error code
#
# If `.custom` is false, 0 indicates success, otherwise,
# 0 indicates that no error code has been assigned
int custom
# Is this a custom error?
int server_side
# Did the error occur on the server-side?
char* description
# Error message, can be `NULL` if `.custom` is false
ctypedef struct libcoopgamma_context_t:
# Library state
#
# Use of this structure is not thread-safe create one instance
# per thread that uses this structure
libcoopgamma_error_t error
# The error of the last failed function call
#
# This member is undefined after successful function call
int fd
# File descriptor for the socket
int have_all_headers
# Whether `libcoopgamma_synchronise` have read the empty end-of-headers line
int bad_message
# Whether `libcoopgamma_synchronise` is reading a corrupt but recoverable message
int blocking
# Is communication blocking?
uint32_t message_id
# Message ID of the next message
uint32_t in_response_to
# The ID of outbound message to which the inbound message being read by
# `libcoopgamma_synchronise` is a response
char* outbound
# Buffer with the outbound message
size_t outbound_head
# The write head for `outbound`
size_t outbound_tail
# The read head for `outbound`
size_t outbound_size
# The allocation size of `outbound`
char* inbound
# Buffer with the inbound message
size_t inbound_head
# The write head for `inbound`
size_t inbound_tail
# The read head for `inbound`
size_t inbound_size
# The allocation size of `inbound`
size_t length
# The value of 'Length' header in the inbound message
size_t curline
# The beginning of the current line that is being read by `libcoopgamma_synchronise`
ctypedef struct libcoopgamma_async_context_t:
# Information necessary to identify and parse a response from the server
uint32_t message_id
# The value of the 'In response to' header in the waited message
int coalesce
# Whether to coalesce all filters into one gamma ramp triplet
cdef extern int libcoopgamma_ramps_initialise_(void* this, size_t width)
'''
Initialise a `libcoopgamma_ramps_t`
`this->red_size`, `this->green_size`, and `this->blue_size` must already be set
@param this The record to initialise
@param width The `sizeof(*(this->red))`
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_ramps_destroy(void* this)
'''
Release all resources allocated to a `libcoopgamma_ramps_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_ramps_initialise
or failed call to `libcoopgamma_ramps_unmarshal
@param this The record to destroy
'''
cdef extern int libcoopgamma_filter_initialise(libcoopgamma_filter_t* this)
'''
Initialise a `libcoopgamma_filter_t`
@param this The record to initialise
@return Zero on success, -1 on err
'''
cdef extern void libcoopgamma_filter_destroy(libcoopgamma_filter_t* this)
'''
Release all resources allocated to a `libcoopgamma_filter_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_filter_initialise`
or failed call to `libcoopgamma_filter_unmarshal`
@param this The record to destroy
'''
cdef extern int libcoopgamma_crtc_info_initialise(libcoopgamma_crtc_info_t* this)
'''
Initialise a `libcoopgamma_crtc_info_t`
@param this The record to initialise
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_crtc_info_destroy(libcoopgamma_crtc_info_t* this)
'''
Release all resources allocated to a `libcoopgamma_crtc_info_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_crtc_info_initialise`
or failed call to `libcoopgamma_crtc_info_unmarshal
@param this The record to destroy
'''
cdef extern int libcoopgamma_filter_query_initialise(libcoopgamma_filter_query_t* this)
'''
Initialise a `libcoopgamma_filter_query_t`
@param this The record to initialise
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_filter_query_destroy(libcoopgamma_filter_query_t* this)
'''
Release all resources allocated to a `libcoopgamma_filter_query_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_filter_query_initialise`
or failed call to `libcoopgamma_filter_query_unmarshal`
@param this The record to destroy
'''
cdef extern int libcoopgamma_queried_filter_initialise(libcoopgamma_queried_filter_t* this)
'''
Initialise a `libcoopgamma_queried_filter_t`
@param this The record to initialise
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_queried_filter_destroy(libcoopgamma_queried_filter_t* this)
'''
Release all resources allocated to a `libcoopgamma_queried_filter_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_queried_filter_initialise`
or failed call to `libcoopgamma_queried_filter_unmarshal
@param this The record to destro
'''
cdef extern int libcoopgamma_filter_table_initialise(libcoopgamma_filter_table_t* this)
'''
Initialise a `libcoopgamma_filter_table_t
@param this The record to initialise
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_filter_table_destroy(libcoopgamma_filter_table_t* this)
'''
Release all resources allocated to a `libcoopgamma_filter_table_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_filter_table_initialise`
or failed call to `libcoopgamma_filter_table_unmarshal`
@param this The record to destroy
'''
cdef extern void libcoopgamma_filter_table_destroy(libcoopgamma_filter_table_t* this)
'''
Release all resources allocated to a `libcoopgamma_filter_table_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_filter_table_initialise`
or failed call to `libcoopgamma_filter_table_unmarshal`
@param this The record to destroy
'''
cdef extern int libcoopgamma_error_initialise(libcoopgamma_error_t* this)
'''
Initialise a `libcoopgamma_error_t`
@param this The record to initialise
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_error_destroy(libcoopgamma_error_t* this)
'''
Release all resources allocated to a `libcoopgamma_error_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_error_initialise`
or failed call to `libcoopgamma_error_unmarshal`
@param this The record to destroy
'''
cdef extern int libcoopgamma_context_initialise(libcoopgamma_context_t* this)
'''
Initialise a `libcoopgamma_context_t`
@param this The record to initialise
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_context_destroy(libcoopgamma_context_t* this, int disconnect)
'''
Release all resources allocated to a `libcoopgamma_context_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_context_initialise`
or failed call to `libcoopgamma_context_unmarshal`
@param this The record to destroy
@param disconnect Disconnect from the server?
'''
cdef extern size_t libcoopgamma_context_marshal(const libcoopgamma_context_t* this, void* buf)
'''
Marshal a `libcoopgamma_context_t` into a buffer
@param this The record to marshal
@param buf The output buffer, `NULL` to only measure
how large this buffer has to be
@return The number of marshalled bytes, or if `buf == NULL`,
how many bytes would be marshalled if `buf != NULL`
'''
cdef extern int libcoopgamma_context_unmarshal(libcoopgamma_context_t* this, const void* buf, size_t* n)
'''
Unmarshal a `libcoopgamma_context_t` from a buffer
@param this The output parameter for unmarshalled record
@param buf The buffer with the marshalled record
@param n Output parameter for the number of unmarshalled bytes, undefined on failure
@return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
`LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
'''
cdef extern int libcoopgamma_async_context_initialise(libcoopgamma_async_context_t* this)
'''
Initialise a `libcoopgamma_async_context_t`
@param this The record to initialise
@return Zero on success, -1 on error
'''
cdef extern void libcoopgamma_async_context_destroy(libcoopgamma_async_context_t* this)
'''
Release all resources allocated to a `libcoopgamma_async_context_t`,
the allocation of the record itself is not freed
Always call this function after failed call to `libcoopgamma_async_context_initialise`
or failed call to `libcoopgamma_async_context_unmarshal`
@param this The record to destroy
'''
cdef extern size_t libcoopgamma_async_context_marshal(const libcoopgamma_async_context_t* this, void* buf)
'''
Marshal a `libcoopgamma_async_context_t` into a buffer
@param this The record to marshal
@param buf The output buffer, `NULL` to only measure
how large this buffer has to be
@return The number of marshalled bytes, or if `buf == NULL`,
how many bytes would be marshalled if `buf != NULL`
'''
cdef extern int libcoopgamma_async_context_unmarshal(libcoopgamma_async_context_t* this,
const void* buf, size_t* n)
'''
Unmarshal a `libcoopgamma_async_context_t` from a buffer
@param this The output parameter for unmarshalled record
@param buf The buffer with the marshalled record
@param n Output parameter for the number of unmarshalled bytes, undefined on failure
@return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
`LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
'''
cdef extern char** libcoopgamma_get_methods()
'''
List all recognised adjustment method
SIGCHLD must not be ignored or blocked
@return A `NULL`-terminated list of names. You should only free
the outer pointer, inner pointers are subpointers of the
outer pointer and cannot be freed. `NULL` on error.
'''
cdef extern int libcoopgamma_get_method_and_site(const char* method, const char* site,
char** methodp, char** sitep)
'''
Get the adjustment method and site
SIGCHLD must not be ignored or blocked
@param method The adjustment method, `NULL` for automatic
@param site The site, `NULL` for automatic
@param methodp Output pointer for the selected adjustment method,
which cannot be `NULL`. It is safe to call
this function with this parameter set to `NULL`.
@param sitep Output pointer for the selected site, which will
be `NULL` the method only supports one site or if
`site == NULL` and no site can be selected
automatically. It is safe to call this function
with this parameter set to `NULL`.
@return Zero on success, -1 on error
'''
cdef extern char* libcoopgamma_get_pid_file(const char* method, const char* site)
'''
Get the PID file of the coopgamma server
SIGCHLD must not be ignored or blocked
@param method The adjustment method, `NULL` for automatic
@param site The site, `NULL` for automatic
@return The pathname of the server's PID file, `NULL` on error
or if there server does not use PID files. The later
case is detected by checking that `errno` is set to 0.
'''
cdef extern char* libcoopgamma_get_socket_file(const char* method, const char* site)
'''
Get the socket file of the coopgamma server
SIGCHLD must not be ignored or blocked
@param method The adjustment method, `NULL` for automatic
@param site The site, `NULL` for automatic
@return The pathname of the server's socket, `NULL` on error
or if there server does have its own socket. The later
case is detected by checking that `errno` is set to 0,
and is the case when communicating with a server in a
multi-server display server like mds.
'''
cdef extern int libcoopgamma_connect(const char* method, const char* site, libcoopgamma_context_t* ctx)
'''
Connect to a coopgamma server, and start it if necessary
Use `libcoopgamma_context_destroy` to disconnect
SIGCHLD must not be ignored or blocked
@param method The adjustment method, `NULL` for automatic
@param site The site, `NULL` for automatic
@param ctx The state of the library, must be initialised
@return Zero on success, -1 on error. On error, `errno` is set
to 0 if the server could not be initialised.
'''
cdef extern int libcoopgamma_set_nonblocking(libcoopgamma_context_t* ctx, int nonblocking)
'''
By default communication is blocking, this function
can be used to switch between blocking and nonblocking
After setting the communication to nonblocking,
`libcoopgamma_flush`, `libcoopgamma_synchronise` and
and request-sending functions can fail with EAGAIN and
EWOULDBLOCK. It is safe to continue with `libcoopgamma_flush`
(for `libcoopgamma_flush` it selfand equest-sending functions)
or `libcoopgamma_synchronise` just like EINTR failure.
@param ctx The state of the library, must be connected
@param nonblocking Nonblocking mode?
@return Zero on success, -1 on error
'''
cdef extern int libcoopgamma_flush(libcoopgamma_context_t* ctx)
'''
Send all pending outbound data
If this function or another function that sends a request
to the server fails with EINTR, call this function to
complete the transfer. The `async` parameter will always
be in a properly configured state if a function fails
with EINTR.
@param ctx The state of the library, must be connected
@return Zero on success, -1 on error
'''
cdef extern int libcoopgamma_synchronise(libcoopgamma_context_t* ctx, libcoopgamma_async_context_t* pending,
size_t n, size_t* selected)
'''
Wait for the next message to be received
@param ctx The state of the library, must be connected
@param pending Information for each pending request
@param n The number of elements in `pending`
@param selected The index of the element in `pending` which corresponds
to the first inbound message, note that this only means
that the message is not for any of the other request,
if the message is corrupt any of the listed requests can
be selected even if it is not for any of the requests.
Functions that parse the message will detect such corruption.
@return Zero on success, -1 on error. If the the message is ignored,
which happens if corresponding `libcoopgamma_async_context_t`
is not listed, -1 is returned and `errno` is set to 0. If -1
is returned, `errno` is set to `ENOTRECOVERABLE` you have
received a corrupt message and the context has been tainted
beyond recover.
'''
cdef extern void libcoopgamma_skip_message(libcoopgamma_context_t* ctx)
'''
Tell the library that you will not be parsing a receive message
@param ctx The state of the library, must be connected
'''
cdef extern int libcoopgamma_get_crtcs_send(libcoopgamma_context_t* ctx, libcoopgamma_async_context_t* async)
'''
List all available CRTC:s, send request part
Cannot be used before connecting to the server
@param ctx The state of the library, must be connected
@param async Information about the request, that is needed to
identify and parse the response, is stored here
@return Zero on success, -1 on error
'''
cdef extern char** libcoopgamma_get_crtcs_recv(libcoopgamma_context_t* ctx, libcoopgamma_async_context_t* async)
'''
List all available CRTC:s, receive response part
@param ctx The state of the library, must be connected
@param async Information about the request
@return A `NULL`-terminated list of names. You should only free
the outer pointer, inner pointers are subpointers of the
outer pointer and cannot be freed. `NULL` on error, in
which case `ctx->error` (rather than `errno`) is read
for information about the error.
'''
cdef extern char** libcoopgamma_get_crtcs_sync(libcoopgamma_context_t* ctx)
'''
List all available CRTC:s, synchronous version
This is a synchronous request function, as such,
you have to ensure that communication is blocking
(default), and that there are not asynchronous
requests waiting, it also means that EINTR:s are
silently ignored and there no wait to cancel the
operation without disconnection from the server
@param ctx The state of the library, must be connected
@return A `NULL`-terminated list of names. You should only free
the outer pointer, inner pointers are subpointers of the
outer pointer and cannot be freed. `NULL` on error, in
which case `ctx->error` (rather than `errno`) is read
for information about the error.
'''
cdef extern int libcoopgamma_get_gamma_info_send(const char* crtc, libcoopgamma_context_t* ctx,
libcoopgamma_async_context_t* async)
'''
Retrieve information about a CRTC:s gamma ramps, send request part
Cannot be used before connecting to the server
@param crtc The name of the CRTC
@param ctx The state of the library, must be connected
@param async Information about the request, that is needed to
identify and parse the response, is stored here
@return Zero on success, -1 on error
'''
cdef extern int libcoopgamma_get_gamma_info_recv(libcoopgamma_crtc_info_t* info, libcoopgamma_context_t* ctx,
libcoopgamma_async_context_t* async)
'''
Retrieve information about a CRTC:s gamma ramps, receive response part
@param info Output parameter for the information, must be initialised
@param ctx The state of the library, must be connected
@param async Information about the request
@return Zero on success, -1 on error, in which case `ctx->error`
(rather than `errno`) is read for information about the error
'''
cdef extern int libcoopgamma_get_gamma_info_sync(const char* crtc, libcoopgamma_crtc_info_t* info,
libcoopgamma_context_t* ctx)
'''
Retrieve information about a CRTC:s gamma ramps, synchronous version
This is a synchronous request function, as such,
you have to ensure that communication is blocking
(default), and that there are not asynchronous
requests waiting, it also means that EINTR:s are
silently ignored and there no wait to cancel the
operation without disconnection from the server
@param crtc The name of the CRTC
@param info Output parameter for the information, must be initialised
@param ctx The state of the library, must be connected
@return Zero on success, -1 on error, in which case `ctx->error`
(rather than `errno`) is read for information about the error
'''
cdef extern int libcoopgamma_get_gamma_send(const libcoopgamma_filter_query_t* query,
libcoopgamma_context_t* ctx, libcoopgamma_async_context_t* async)
'''
Retrieve the current gamma ramp adjustments, send request part
Cannot be used before connecting to the server
@param query The query to send
@param ctx The state of the library, must be connected
@param async Information about the request, that is needed to
identify and parse the response, is stored here
@return Zero on success, -1 on error
'''
cdef extern int libcoopgamma_get_gamma_recv(libcoopgamma_filter_table_t* table, libcoopgamma_context_t* ctx,
libcoopgamma_async_context_t* async)
'''
Retrieve the current gamma ramp adjustments, receive response part
@param table Output for the response, must be initialised
@param ctx The state of the library, must be connected
@param async Information about the request
@return Zero on success, -1 on error, in which case `ctx->error`
(rather than `errno`) is read for information about the error
'''
cdef extern int libcoopgamma_get_gamma_sync(const libcoopgamma_filter_query_t* query,
libcoopgamma_filter_table_t* table, libcoopgamma_context_t* ctx)
'''
Retrieve the current gamma ramp adjustments, synchronous version
This is a synchronous request function, as such,
you have to ensure that communication is blocking
(default), and that there are not asynchronous
requests waiting, it also means that EINTR:s are
silently ignored and there no wait to cancel the
operation without disconnection from the server
@param query The query to send
@param table Output for the response, must be initialised
@param ctx The state of the library, must be connected
@return Zero on success, -1 on error, in which case `ctx->error`
(rather than `errno`) is read for information about the error
'''
cdef extern int libcoopgamma_set_gamma_send(const libcoopgamma_filter_t* filter, libcoopgamma_context_t* ctx,
libcoopgamma_async_context_t* async)
'''
Apply, update, or remove a gamma ramp adjustment, send request part
Cannot be used before connecting to the server
@param filter The filter to apply, update, or remove, gamma ramp meta-data must match the CRTC's
@param ctx The state of the library, must be connected
@param async Information about the request, that is needed to
identify and parse the response, is stored here
@return Zero on success, -1 on error
'''
cdef extern int libcoopgamma_set_gamma_recv(libcoopgamma_context_t* ctx, libcoopgamma_async_context_t* async)
'''
Apply, update, or remove a gamma ramp adjustment, receive response part
@param ctx The state of the library, must be connected
@param async Information about the request
@return Zero on success, -1 on error, in which case `ctx->error`
(rather than `errno`) is read for information about the error
'''
cdef extern int libcoopgamma_set_gamma_sync(const libcoopgamma_filter_t* filter, libcoopgamma_context_t* ctx)
'''
Apply, update, or remove a gamma ramp adjustment, synchronous version
This is a synchronous request function, as such,
you have to ensure that communication is blocking
(default), and that there are not asynchronous
requests waiting, it also means that EINTR:s are
silently ignored and there no wait to cancel the
operation without disconnection from the server
@param filter The filter to apply, update, or remove, gamma ramp meta-data must match the CRTC's
@param ctx The state of the library, must be connected
@return Zero on success, -1 on error, in which case `ctx->error`
(rather than `errno`) is read for information about the error
'''
