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/**
* 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 <stdio.h>
/**
* Draw bars in different shades of grey, red, green and blue
* used for calibrating the contrast and brightness
*
* @return Zero on success, -1 on error
*/
int 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, y, x, fn = fb_count();
for (f = 0; f < fn; f++)
{
framebuffer_t fb;
if (fb_open(f, &fb) < 0)
return -1;
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;
}
/**
* 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
* @return Zero on success, -1 on error
*/
int 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 value = (digit & (1 << i)) ? 0xFFFF : 0;
int j = i + colour;
crtc->red[j] = crtc->green[j] = crtc->blue[j] = value;
}
#undef __
}
/**
* Draw an unique index on each monitor
*
* @return Zero on success, -1 on error
*/
int draw_id(void)
{
size_t f, c, i, id = 0, fn = fb_count(), cn = drm_card_count();
for (f = 0; f < fn; f++)
{
framebuffer_t fb;
if (fb_open(f, &fb) < 0)
return -1;
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);
fb_close(&fb);
}
for (c = 0; c < cn; c++)
{
drm_card_t card;
if (drm_card_open(c, &card) < 0)
return -1;
for (i = 0; i < card.crtc_count; i++)
{
drm_crtc_t crtc;
if (drm_crtc_open(i, &card, &crtc) < 0)
{
drm_card_close(&card);
return -1;
}
if (crtc.connected == 0)
goto not_connected;
if (drm_get_gamma(&crtc) < 0)
goto crtc_fail;
gamma_digit(&crtc, 1, id < 10 ? 10 : (id / 10) % 10);
gamma_digit(&crtc, 8, (id / 1) % 10);
id++;
if (drm_set_gamma(&crtc) < 0)
goto crtc_fail;
not_connected:
drm_crtc_close(&crtc);
continue;
crtc_fail:
drm_crtc_close(&crtc);
drm_card_close(&card);
return -1;
}
drm_card_close(&card);
}
return 0;
}
/**
* Draw squares used as reference when tweeking the gamma correction
*
* @return Zero on success, -1 on error
*/
int draw_gamma(void)
{
size_t f, x, y, fn = fb_count();
for (f = 0; f < fn; f++)
{
framebuffer_t fb;
if (fb_open(f, &fb) < 0)
return -1;
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);
}
fb_close(&fb);
}
return 0;
}
int main(int argc __attribute__((unused)), char* argv[])
{
if (draw_gamma() < 0)
goto fail;
return 0;
fail:
perror(*argv);
return 1;
}
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