d600cd9aee
It takes transforms A and B and returns the transform to get from A to B. https://gitlab.gnome.org/GNOME/mutter/merge_requests/526
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*
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* Copyright (C) 2018 Robert Mader
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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 as
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* published by the Free Software Foundation; either version 2 of the
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "backends/meta-monitor-transform.h"
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MetaMonitorTransform
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meta_monitor_transform_invert (MetaMonitorTransform transform)
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{
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switch (transform)
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{
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case META_MONITOR_TRANSFORM_90:
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return META_MONITOR_TRANSFORM_270;
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case META_MONITOR_TRANSFORM_270:
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return META_MONITOR_TRANSFORM_90;
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case META_MONITOR_TRANSFORM_NORMAL:
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case META_MONITOR_TRANSFORM_180:
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case META_MONITOR_TRANSFORM_FLIPPED:
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case META_MONITOR_TRANSFORM_FLIPPED_90:
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case META_MONITOR_TRANSFORM_FLIPPED_180:
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case META_MONITOR_TRANSFORM_FLIPPED_270:
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return transform;
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}
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g_assert_not_reached ();
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return 0;
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}
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MetaMonitorTransform
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meta_monitor_transform_transform (MetaMonitorTransform transform,
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MetaMonitorTransform other)
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{
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MetaMonitorTransform new_transform;
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new_transform = (transform + other) % META_MONITOR_TRANSFORM_FLIPPED;
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if (meta_monitor_transform_is_flipped (transform) !=
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meta_monitor_transform_is_flipped (other))
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new_transform += META_MONITOR_TRANSFORM_FLIPPED;
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return new_transform;
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}
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/**
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* meta_monitor_transform_relative_transform:
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* @transform: The transform to start from
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* @other: The transform to go to
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*
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* Return value: a transform to get from @transform to @other
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*/
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MetaMonitorTransform
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meta_monitor_transform_relative_transform (MetaMonitorTransform transform,
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MetaMonitorTransform other)
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{
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MetaMonitorTransform relative_transform;
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relative_transform = ((other % META_MONITOR_TRANSFORM_FLIPPED -
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transform % META_MONITOR_TRANSFORM_FLIPPED) %
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META_MONITOR_TRANSFORM_FLIPPED);
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if (meta_monitor_transform_is_flipped (transform) !=
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meta_monitor_transform_is_flipped (other))
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{
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relative_transform = (meta_monitor_transform_invert (relative_transform) +
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META_MONITOR_TRANSFORM_FLIPPED);
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}
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return relative_transform;
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}
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