aboutsummaryrefslogtreecommitdiffstats
path: root/state.c
diff options
context:
space:
mode:
authorMattias Andrée <maandree@kth.se>2021-02-20 23:20:05 +0100
committerMattias Andrée <maandree@kth.se>2021-02-20 23:20:11 +0100
commit91ce2e7e5c8c7659237b89b8c4a072b1c46b1fca (patch)
treeae87077ad8d6aaa4cbb064f092fe3b380b9852d6 /state.c
parentupdate dist (diff)
downloadcrt-calibrator-91ce2e7e5c8c7659237b89b8c4a072b1c46b1fca.tar.gz
crt-calibrator-91ce2e7e5c8c7659237b89b8c4a072b1c46b1fca.tar.bz2
crt-calibrator-91ce2e7e5c8c7659237b89b8c4a072b1c46b1fca.tar.xz
misc + change license + remove info manual1.3.2
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to 'state.c')
-rw-r--r--state.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/state.c b/state.c
new file mode 100644
index 0000000..4e7b00d
--- /dev/null
+++ b/state.c
@@ -0,0 +1,144 @@
+/* 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;
+}