/** * 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 . */ #include "calibrator.h" #include "gamma.h" #include "state.h" #include #include #include #include #include #include /** * 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); } } } static int read_calibs(void) { size_t c; for (c = 0; c < crtc_count; c++) { if (drm_get_gamma(crtcs + c) < 0) return -1; gamma_analyse(crtcs[c].gamma_stops, crtcs[c].red, gammas[0] + c, contrasts[0] + c, brightnesses[0] + c); gamma_analyse(crtcs[c].gamma_stops, crtcs[c].green, gammas[1] + c, contrasts[1] + c, brightnesses[1] + c); gamma_analyse(crtcs[c].gamma_stops, crtcs[c].blue, gammas[2] + c, contrasts[2] + c, brightnesses[2] + c); } return 0; } static int apply_calibs(void) { size_t c; for (c = 0; c < crtc_count; c++) { gamma_generate(crtcs[c].gamma_stops, crtcs[c].red, gammas[0][c], contrasts[0][c], brightnesses[0][c]); gamma_generate(crtcs[c].gamma_stops, crtcs[c].green, gammas[1][c], contrasts[1][c], brightnesses[1][c]); gamma_generate(crtcs[c].gamma_stops, crtcs[c].blue, gammas[2][c], contrasts[2][c], brightnesses[2][c]); if (drm_set_gamma(crtcs + c) < 0) return -1; } return 0; } 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 deactivate any program 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 when\n"); printf("your are done.\n"); fflush(stdout); while (getchar() != 10) ; printf("\033[H\033[2J"); fflush(stdout); draw_contrast_brightness(); while (getchar() != 10) ; printf("\033[H\033[2J"); printf("An index will be displayed on each monitor.\n"); printf("It behoves you to memorise them.\n"); printf("\n"); printf("Press ENTER to continue, and ENTER again when\n"); printf("your are done.\n"); fflush(stdout); while (getchar() != 10) ; printf("\033[H\033[2J"); fflush(stdout); if ((read_calibs() < 0) || (draw_id() < 0)) goto fail; while (getchar() != 10) ; if (apply_calibs() < 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; }