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// Copyright (c) 2021 Teddy Wing
//
// This file is part of Re-Good Catalina Invert Colours.
//
// Re-Good Catalina Invert Colours 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.
//
// Re-Good Catalina Invert Colours 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 Re-Good Catalina Invert Colours. If not, see
// <https://www.gnu.org/licenses/>.
#import "Invert.h"
#define MAX_DISPLAYS 8
static const CGGammaValue INVERTED_GAMMA[2] = {1, 0};
@implementation Invert
- (id)init
{
self = [super init];
if (self) {
_inverted = NO;
}
return self;
}
- (void)toggleInvertColors:(NSEvent *)event
{
if (!_inverted) {
[self invertColors];
_inverted = YES;
}
else {
[self restoreColors];
_inverted = NO;
}
}
- (void)invertColors
{
CGDirectDisplayID active_displays[MAX_DISPLAYS];
uint32_t display_count;
CGError error = CGGetActiveDisplayList(
MAX_DISPLAYS,
&active_displays[0],
&display_count
);
if (error != kCGErrorSuccess) {
NSLog(@"Error getting active displays: %d", error);
}
for (int i = 0; i < display_count; i++) {
error = CGSetDisplayTransferByTable(
active_displays[i],
2,
INVERTED_GAMMA,
INVERTED_GAMMA,
INVERTED_GAMMA
);
if (error != kCGErrorSuccess) {
NSLog(
@"Error inverting display '%d': %d",
active_displays[i],
error
);
}
}
}
- (void)restoreColors
{
CGDisplayRestoreColorSyncSettings();
}
@end
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