/**
* crt-calibrator – Calibration utility for CRT monitors
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "calibrator.h"
#include "framebuffer.h"
#include "drmgamma.h"
#include "gamma.h"
#include <stdio.h>
static const int CONTRAST_BRIGHTNESS_LEVELS[21] =
{
0, 17, 27, 38, 48, 59, 70, 82, 94, 106, 119, 131,
144, 158, 171, 185, 198, 212, 226, 241, 255
};
int main(int argc __attribute__((unused)), char* argv[])
{
size_t f, y, x, fn = fb_count();
for (f = 0; f < fn; f++)
{
framebuffer_t fb;
if (fb_open(f, &fb) < 0)
goto fail;
for (y = 0; y < 4; y++)
for (x = 0; x < 21; x++)
{
int v = CONTRAST_BRIGHTNESS_LEVELS[x];
uint32_t colour = fb_colour(v * ((y == 1) | (y == 0)),
v * ((y == 2) | (y == 0)),
v * ((y == 3) | (y == 0)));
fb_fill_rectangle(&fb, colour,
x * fb.width / 21,
y * fb.height / 4,
(x + 1) * fb.width / 21 - x * fb.width / 21,
(y + 1) * fb.height / 4 - y * fb.height / 4);
}
fb_close(&fb);
}
return 0;
fail:
perror(*argv);
return 1;
}
