/**
* 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 "gamma.h"
#include "state.h"
#include <stdio.h>
#include <unistd.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
/**
* Draw bars in different shades of grey, red, green and blue
* used for calibrating the contrast and brightness
*/
void draw_contrast_brightness(void)
{
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
};
size_t f;
uint32_t y, x;
for (f = 0; f < framebuffer_count; f++)
{
framebuffer_t* restrict fb = framebuffers + f;
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);
}
}
}
/**
* Draw a seven segment display
*
* @param fb The framebuffer to draw on
* @param colour The intensity of the least intense colour to use
* @param x The X component of the top left corner of the seven segment display
* @param y The Y component of the top left corner of the seven segment display
*/
void draw_digit(framebuffer_t* restrict fb, int colour, uint32_t x, uint32_t y)
{
uint32_t c;
c = fb_colour(colour + 0, colour + 0, colour + 0);
fb_fill_rectangle(fb, c, x + 20, y, 80, 20);
c = fb_colour(colour + 1, colour + 1, colour + 1);
fb_fill_rectangle(fb, c, x, y + 20, 20, 80);
c = fb_colour(colour + 2, colour + 2, colour + 2);
fb_fill_rectangle(fb, c, x + 100, y + 20, 20, 80);
c = fb_colour(colour + 3, colour + 3, colour + 3);
fb_fill_rectangle(fb, c, x + 20, y + 100, 80, 20);
c = fb_colour(colour + 4, colour + 4, colour + 4);
fb_fill_rectangle(fb, c, x, y + 120, 20, 80);
c = fb_colour(colour + 5, colour + 5, colour + 5);
fb_fill_rectangle(fb, c, x + 100, y + 120, 20, 80);
c = fb_colour(colour + 6, colour + 6, colour + 6);
fb_fill_rectangle(fb, c, x + 20, y + 200, 80, 20);
}
/**
* Manipulate a CRT controllers gamma ramps to display a specific digit
* for one of the seven segment display on only that CRT controller's
* monitors
*
* @param crtc The CRT controller information
* @param colour The intensity of the least intense colour in the seven segment display
* @param value The valud of the digit to display
*/
void gamma_digit(drm_crtc_t* restrict crtc, int colour, size_t value)
{
#define __ 0
const int DIGITS[11] = { 1 | 2 | 4 | __ | 16 | 32 | 64, /* (0) */
__ | __ | 4 | __ | __ | 32 | __, /* (1) */
1 | __ | 4 | 8 | 16 | __ | 64, /* (2) */
1 | __ | 4 | 8 | __ | 32 | 64, /* (3) */
__ | 2 | 4 | 8 | __ | 32 | __, /* (4) */
1 | 2 | __ | 8 | __ | 32 | 64, /* (5) */
1 | 2 | __ | 8 | 16 | 32 | 64, /* (6) */
1 | __ | 4 | __ | __ | 32 | __, /* (7) */
1 | 2 | 4 | 8 | 16 | 32 | 64, /* (8) */
1 | 2 | 4 | 8 | __ | 32 | 64, /* (9) */
__ | __ | __ | __ | __ | __ | __}; /* not visible */
int i, digit = DIGITS[value];
for (i = 0; i < 7; i++)
{
uint16_t c = (digit & (1 << i)) ? 0xFFFF : 0;
int j = i + colour;
crtc->red[j] = crtc->green[j] = crtc->blue[j] = c;
}
#undef __
}
/**
* Draw an unique index on each monitor
*
* @return Zero on success, -1 on error
*/
int draw_id(void)
{
size_t f, c, id = 0;
for (f = 0; f < framebuffer_count; f++)
{
framebuffer_t* restrict fb = framebuffers + f;
fb_fill_rectangle(fb, fb_colour(0, 0, 0), 0, 0, fb->width, fb->height);
draw_digit(fb, 1, 40, 40);
draw_digit(fb, 8, 180, 40);
}
for (c = 0; c < crtc_count; c++)
{
drm_crtc_t* restrict crtc = crtcs + c;
if (drm_get_gamma(crtc) < 0)
return -1;
gamma_digit(crtc, 1, id < 10 ? 10 : (id / 10) % 10);
gamma_digit(crtc, 8, (id / 1) % 10);
id++;
if (drm_set_gamma(crtc) < 0)
return -1;
}
return 0;
}
/**
* Draw squares used as reference when tweeking the gamma correction
*/
void draw_gamma(void)
{
size_t f;
uint32_t x, y;
for (f = 0; f < framebuffer_count; f++)
{
framebuffer_t* restrict fb = framebuffers + f;
for (x = 0; x < 4; x++)
{
int r = (x == 1) || (x == 0);
int g = (x == 2) || (x == 0);
int b = (x == 3) || (x == 0);
uint32_t background = fb_colour(128 * r, 128 * g, 128 * b);
uint32_t average = fb_colour(188 * r, 188 * g, 188 * b);
uint32_t high = fb_colour(255 * r, 255 * g, 255 * b);
uint32_t low = fb_colour(0, 0, 0);
uint32_t xoff = x * fb->width / 4;
fb_fill_rectangle(fb, background, xoff, 0, fb->width / 4, fb->height);
xoff += (fb->width / 4 - 200) / 2;
fb_fill_rectangle(fb, high, xoff, 40, 200, 200);
fb_fill_rectangle(fb, average, xoff + 50, 40, 100, 200);
fb_fill_rectangle(fb, average, xoff, 280, 200, 200);
for (y = 0; y < 200; y += 2)
{
fb_draw_horizontal_line(fb, high, xoff + 50, 280 + y + 0, 100);
fb_draw_horizontal_line(fb, low , xoff + 50, 280 + y + 1, 100);
}
fb_fill_rectangle(fb, average, xoff, 520, 200, 200);
fb_fill_rectangle(fb, high, xoff + 50, 520, 100, 200);
}
}
}
int main(int argc __attribute__((unused)), char* argv[])
{
int tty_configured = 0, rc = 0, in_fork = 0;
struct termios saved_stty;
struct termios stty;
pid_t pid;
if ((acquire_video() < 0) ||
(tcgetattr(STDIN_FILENO, &saved_stty) < 0) ||
(tcgetattr(STDIN_FILENO, &stty) < 0))
goto fail;
stty.c_lflag &= (tcflag_t)~(ICANON | ECHO);
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &stty) < 0)
goto fail;
tty_configured = 1;
printf("\033[?25l");
fflush(stdout);
pid = fork();
if ((pid != (pid_t)-1) && (pid != 0))
{
int status;
retry:
if (waitpid(pid, &status, 0) != (pid_t)-1)
rc = !!status;
else
{
if (errno != EINTR)
perror(*argv);
goto retry;
}
goto done;
}
else if (pid == 0)
in_fork = 1;
printf("\033[H\033[2J");
printf("Please turn of any programs that dynamically\n");
printf("applies filters to your monitors' colours\n");
printf("and remove any existing filters.\n");
printf("In doubt, you probably do not have any.\n");
printf("\n");
printf("You will be presented with an image on each\n");
printf("monitor. Please use the control panel on your\n");
printf("to calibrate the contrast and brightness of\n");
printf("each monitor. The contrasts adjusts the\n");
printf("brightness of bright colours, and the\n");
printf("brightness adjusts the brightness of dim\n");
printf("colours. All rectangles are of equals size\n");
printf("and they should be distrint from eachother.\n");
printf("There should only be a slight difference\n");
printf("between the two darkest colours for each\n");
printf("colour. The grey colour does not need to\n");
printf("be perfectly grey but should be close.\n");
printf("The brightness should be as high as\n");
printf("possible without the first square being\n");
printf("any other colour than black or the two first\n");
printf("square being too distinct from eachother. The\n");
printf("contrast should be as high as possible without\n");
printf("causing distortion.\n");
printf("\n");
printf("Press ENTER to continue, and ENTER again once\n");
printf("your are done.\n");
fflush(stdout);
while (getchar() != 10)
;
printf("\033[H\033[2J");
fflush(stdout);
draw_contrast_brightness();
while (getchar() != 10)
;
if (draw_id() < 0)
goto fail;
done:
if (in_fork == 0)
{
release_video();
if (tty_configured)
tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_stty);
printf("\033[?25h");
fflush(stdout);
}
return rc;
fail:
perror(*argv);
rc = 1;
goto done;
}
