path: root/src/libgamma_facade.py

# -*- python -*-
'''
pylibgamma — Python 3 wrapper for libgamma
Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)

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/>.
'''


from libgamma_method import MethodCapabilities



def list_methods(operation : int) -> list
    '''
    List available adjustment methods by their order of preference based on the environment.
    
    @param  operation    Allowed values:
                           0: Methods that the environment suggests will work, excluding fake.
                           1: Methods that the environment suggests will work, including fake.
                           2: All real non-fake methods.
                           3: All real methods.
                           4: All methods.
                         Other values invoke undefined behaviour.
    @return  :list<int>  A list of available adjustment methods.
    '''
    from libgamma_native_method import libgamma_native_list_methods
    return libgamma_native_list_methods(method)


def is_method_available(method : int) -> bool:
    '''
    Check whether an adjustment method is available, non-existing (invalid) methods will be
    identified as not available under the rationale that the library may be out of date.
    
    @param   method  The adjustment method.
    @return          Whether the adjustment method is available.
    '''
    from libgamma_native_method import libgamma_native_is_method_available
    return not libgamma_native_is_method_available(method) == 0


def method_capabilities(method : int) -> MethodCapabilities:
    '''
    Return the capabilities of an adjustment method.
    
    @param  this    The data structure to fill with the method's capabilities
    @param  method  The adjustment method (display server and protocol).
    '''
    from libgamma_native_method import libgamma_native_method_capabilities
    caps = libgamma_native_method_capabilities(method)
    MethodCapabilities(*caps)


def method_default_site(method : int) -> str:
    '''
    Return the capabilities of an adjustment method.
    
    @param   method  The adjustment method (display server and protocol.)
    @return          The default site, `None` if it cannot be determined or
                     if multiple sites are not supported by the adjustment
                     method.
    '''
    from libgamma_native_method import libgamma_native_method_default_site
    return libgamma_native_method_default_site(method)


def method_default_site_variable(method : int) -> str:
    '''
    Return the capabilities of an adjustment method.
    
    @param   method  The adjustment method (display server and protocol.)
    @return          The environ variables that is used to determine the
                     default site. `None` if there is none, that is, if
                     the method does not support multiple sites.
    '''
    from libgamma_native_method import libgamma_native_method_default_site_variable
    return libgamma_native_method_default_site_variable(method)



def behex_edid(edid : bytes) -> str:
    '''
    Convert a raw representation of an EDID to a lowercase hexadecimal representation.
    
    @param   edid  The EDID in raw representation.
    @return        The EDID in lowercase hexadecimal representation.
    '''
    return behex_edid_lowercase(edid)


def behex_edid_lowercase(edid : bytes) -> str:
    '''
    Convert a raw representation of an EDID to a lowercase hexadecimal representation.
    
    @param   edid  The EDID in raw representation.
    @return        The EDID in lowercase hexadecimal representation.
    '''
    rc = ''
    for b in edid:
        rc += '0123456789abcdef'[(b >> 4) & 15]
        rc += '0123456789abcdef'[(b >> 0) & 15]
    return rc


def behex_edid_uppercase(edid : bytes) -> str:
    '''
    Convert a raw representation of an EDID to an uppercase hexadecimal representation.
    
    @param   edid  The EDID in raw representation.
    @return        The EDID in uppercase hexadecimal representation.
    '''
    rc = ''
    for b in edid:
        rc += '0123456789ABCDEF'[(b >> 4) & 15]
        rc += '0123456789ABCDEF'[(b >> 0) & 15]
    return rc


def unhex_edid(edid : str) -> bytes:
    '''
    Convert an hexadecimal representation of an EDID to a raw representation.
    
    @param   edid  The EDID in hexadecimal representation.
    @return        The EDID in raw representation.
    '''
    rc = []
    edid = edid.lowercase()
    for i in range(0, len(edid), 2):
        a, b = edid[i + 0], edid[i + 1]
        a = '0123456789abcdef'.find(a) << 4
        b = '0123456789abcdef'.find(b) << 0
        rc.append(a | b)
    return bytes(rc)