/**
* Set the gamma ramps of the of a monitor
*
* @param connection The identifier for the connection to the card
* @param crtc_index The index of the CRTC to read from
* @param gamma_size The size a gamma ramp
* @param red The red gamma ramp
* @param green The green gamma ramp
* @param blue The blue gamma ramp
* @return Zero on success
*/
int blueshift_drm_set_gamma_ramps(int connection, int crtc_index, int gamma_size, uint16_t* red, uint16_t* green, uint16_t* blue)
{
card_connection* card = card_connections + connection;
/* Fails if inside a graphical environment */
return drmModeCrtcSetGamma(card->fd, *(card->res->crtcs + crtc_index), (uint32_t)gamma_size, red, green, blue);
}
static void
crtc_gamma_set(xf86CrtcPtr crtc, CARD16 * red, CARD16 * green, CARD16 * blue,
int size)
{
modesettingPtr ms = modesettingPTR(crtc->scrn);
struct crtc_private *crtcp = crtc->driver_private;
drmModeCrtcSetGamma(ms->fd, crtcp->drm_crtc->crtc_id, size, red, green, blue);
}
static void
drmmode_crtc_gamma_set(xf86CrtcPtr crtc,
CARD16 *red, CARD16 *green, CARD16 *blue, int size)
{
drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
drmmode_ptr drmmode = drmmode_crtc->drmmode;
drmModeCrtcSetGamma(drmmode->fd, drmmode_crtc->mode_crtc->crtc_id,
size, red, green, blue);
}
static void
drm_restore(drm_state_t *state)
{
drm_crtc_state_t *crtcs = state->crtcs;
while (crtcs->crtc_num >= 0) {
if (crtcs->r_gamma != NULL) {
drmModeCrtcSetGamma(state->fd, crtcs->crtc_id, crtcs->gamma_size,
crtcs->r_gamma, crtcs->g_gamma, crtcs->b_gamma);
}
crtcs++;
}
}
static int
drm_set_temperature(
drm_state_t *state, const color_setting_t *setting, int preserve)
{
drm_crtc_state_t *crtcs = state->crtcs;
int last_gamma_size = 0;
uint16_t *r_gamma = NULL;
uint16_t *g_gamma = NULL;
uint16_t *b_gamma = NULL;
for (; crtcs->crtc_num >= 0; crtcs++) {
if (crtcs->gamma_size <= 1)
continue;
if (crtcs->gamma_size != last_gamma_size) {
if (last_gamma_size == 0) {
r_gamma = malloc(3 * crtcs->gamma_size * sizeof(uint16_t));
g_gamma = r_gamma + crtcs->gamma_size;
b_gamma = g_gamma + crtcs->gamma_size;
} else if (crtcs->gamma_size > last_gamma_size) {
r_gamma = realloc(r_gamma, 3 * crtcs->gamma_size * sizeof(uint16_t));
g_gamma = r_gamma + crtcs->gamma_size;
b_gamma = g_gamma + crtcs->gamma_size;
}
if (r_gamma == NULL) {
perror(last_gamma_size == 0 ? "malloc" : "realloc");
return -1;
}
last_gamma_size = crtcs->gamma_size;
}
/* Initialize gamma ramps to pure state */
int ramp_size = crtcs->gamma_size;
for (int i = 0; i < ramp_size; i++) {
uint16_t value = (double)i/ramp_size * (UINT16_MAX+1);
r_gamma[i] = value;
g_gamma[i] = value;
b_gamma[i] = value;
}
colorramp_fill(r_gamma, g_gamma, b_gamma, crtcs->gamma_size,
setting);
drmModeCrtcSetGamma(state->fd, crtcs->crtc_id, crtcs->gamma_size,
r_gamma, g_gamma, b_gamma);
}
free(r_gamma);
return 0;
}
