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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 "state.h"
#include <stdlib.h>
/**
* The framebuffers on the system
*/
framebuffer_t* restrict framebuffers = NULL;
/**
* The number of elements in `framebuffers`
*/
size_t framebuffer_count = 0;
/**
* The graphics cards on the system
*/
drm_card_t* restrict cards = NULL;
/**
* The number of elements in `cards`
*/
size_t card_count = 0;
/**
* The connected CRT controllers on the system
*/
drm_crtc_t* restrict crtcs = NULL;
/**
* The software brightness setting on each connected CRT controller, on each channel
*/
double* restrict brightnesses[3];
/**
* The software contrast setting on each connected CRT controller, on each channel
*/
double* restrict contrasts[3];
/**
* The gamma correction on each connected CRT controller, on each channel
*/
double* restrict gammas[3];
/**
* The number of elements in `crtcs`, `brightnesses[]`, `contrasts[]` and `gammas[]`
*/
size_t crtc_count = 0;
/**
* Acquire video control
*
* @return Zero on success, -1 on error
*/
int acquire_video(void)
{
size_t f, c, i, fn = fb_count(), cn = drm_card_count();
drm_crtc_t* restrict old_crtcs;
framebuffers = malloc(fn * sizeof(framebuffer_t));
if (framebuffers == NULL)
return -1;
for (f = 0; f < fn; f++)
{
framebuffer_t fb;
if (fb_open(f, &fb) < 0)
return -1;
framebuffers[framebuffer_count++] = fb;
}
cards = malloc(cn * sizeof(drm_card_t));
if (cards == NULL)
return -1;
for (c = 0; c < cn; c++)
{
drm_card_t card;
if (drm_card_open(c, &card) < 0)
return -1;
cards[card_count++] = card;
old_crtcs = crtcs;
crtcs = realloc(crtcs, (crtc_count + card.crtc_count) * sizeof(drm_crtc_t));
if (crtcs == NULL)
{
crtcs = old_crtcs;
return -1;
}
for (i = 0; i < card.crtc_count; i++)
{
drm_crtc_t crtc;
if (drm_crtc_open(i, cards + c, &crtc) < 0)
return -1;
if (crtc.connected)
crtcs[crtc_count++] = crtc;
else
drm_crtc_close(&crtc);
}
}
for (c = 0; c < 3; c++)
{
brightnesses[c] = malloc(crtc_count * sizeof(double));
if (brightnesses[c] == NULL)
return -1;
contrasts[c] = malloc(crtc_count * sizeof(double));
if (contrasts[c] == NULL)
return -1;
gammas[c] = malloc(crtc_count * sizeof(double));
if (gammas[c] == NULL)
return -1;
}
return 0;
}
/**
* Release video control
*/
void release_video(void)
{
size_t i;
for (i = 0; i < crtc_count; i++)
drm_crtc_close(crtcs + i);
crtc_count = 0;
for (i = 0; i < card_count; i++)
drm_card_close(cards + i);
card_count = 0;
for (i = 0; i < framebuffer_count; i++)
fb_close(framebuffers + i);
framebuffer_count = 0;
for (i = 0; i < 3; i++)
{
free(brightnesses[i]), brightnesses[i] = NULL;
free(contrasts[i]), contrasts[i] = NULL;
free(gammas[i]), gammas[i] = NULL;
}
free(crtcs), crtcs = NULL;
free(cards), cards = NULL;
free(framebuffers), framebuffers = NULL;
}
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