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/* See LICENSE file for copyright and license details. */
#include "common.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, crtc;
drm_card_t card;
framebuffer_t fb;
framebuffers = malloc(fn * sizeof(framebuffer_t));
if (!framebuffers)
return -1;
for (f = 0; f < fn; f++) {
if (fb_open(f, &fb) < 0)
return -1;
framebuffers[framebuffer_count++] = fb;
}
cards = malloc(cn * sizeof(drm_card_t));
if (!cards)
return -1;
for (c = 0; c < cn; c++) {
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) {
crtcs = old_crtcs;
return -1;
}
for (i = 0; i < card.crtc_count; i++) {
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])
return -1;
contrasts[c] = malloc(crtc_count * sizeof(double));
if (!contrasts[c])
return -1;
gammas[c] = malloc(crtc_count * sizeof(double));
if (!gammas[c])
return -1;
}
return 0;
}
/**
* Release video control
*/
void
release_video(void)
{
size_t i;
while (crtc_count)
drm_crtc_close(&crtcs[--crtc_count]);
while (card_count)
drm_card_close(&cards[--card_count]);
while (framebuffer_count)
fb_close(&framebuffers[--framebuffer_count]);
for (i = 0; i < 3; i++) {
free(brightnesses[i]);
free(contrasts[i]);
free(gammas[i]);
brightnesses[i] = NULL;
contrasts[i] = NULL;
gammas[i] = NULL;
}
free(crtcs);
free(cards);
free(framebuffers);
crtcs = NULL;
cards = NULL;
framebuffers = NULL;
}
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