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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/*
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* Copyright (C) 2016 P.L. Lucas
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __LXQTBACKLIGHT_BACKEND_H__
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#define __LXQTBACKLIGHT_BACKEND_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdio.h>
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/**Returns actual value of backlight.
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* -1 will be returned if backlight can not be changed.
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*/
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int lxqt_backlight_backend_get();
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/**Returns maximum value of backlight.
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* -1 will be returned if backlight can not be changed.
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*/
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int lxqt_backlight_backend_get_max();
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/**Returns a FILE pointer to stream which can be used to write values
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* of backlight.
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* int max_backlight = lxqt_backlight_backend_get_max();
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* if(max_backlight<0)
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* return; // Backlight can not be controlled.
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* FILE *fout = lxqt_backlight_backend_write_stream();
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* fprintf(fout, "%d\n", 3);
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* fflush(fout);
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* // ... Do something ...
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* fprintf(fout, "%d\n", 7);
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* fclose(fout);
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* Under Qt you can use QTextStream class:
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* FILE *fout = lxqt_backlight_backend_write_stream();
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* QTextStream backlightStream(fout);
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* backlightStream << 3 << endl;
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*/
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FILE *lxqt_backlight_backend_get_write_stream();
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/**Returns if backlight power is turned off.
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* @ return 0 backlight off, bigger then 0 backlight on.
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*/
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int lxqt_backlight_is_backlight_off();
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/**Returns the driver. Backlight values are read from /sys/class/backlight/driver/.
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* Example:
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* char *driver = lxqt_backlight_backend_get_driver();
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* printf("%s\n", driver);
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* free(driver);
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*/
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char *lxqt_backlight_backend_get_driver();
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#ifdef __cplusplus
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}
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#endif
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#endif |