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Continously change color temperature (Add -o for one shot mode).

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In continous mode, make a short transition from 6500K to the target
 temperature when the program starts.
This commit is contained in:
Jon Lund Steffensen
2009-12-26 00:07:01 +01:00
parent bb5a75db6d
commit 1846f040ea
1 changed files with 129 additions and 69 deletions
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src/redshift.c
+129 -69
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@@ -77,6 +77,9 @@
" -l LAT:LON\tYour current location\n" \
" -m METHOD\tMethod to use to set color temperature" \
" (randr or vidmode)\n" \
" -o\t\tOne shot mode (do not continously adjust" \
" color temperature)" \
" -r\t\tDisable initial temperature transition" \
" -s SCREEN\tX screen to apply adjustments to\n" \
" -t DAY:NIGHT\tColor temperature to set at daytime/night\n" \
" -v\t\tVerbose output\n"
@@ -85,6 +88,81 @@
#define DEG_CHAR 0xb0
static int
calculate_temp(double elevation, int temp_day, int temp_night,
int verbose)
{
int temp = 0;
if (elevation < TRANSITION_LOW) {
temp = temp_night;
if (verbose) printf("Period: Night\n");
} else if (elevation < TRANSITION_HIGH) {
/* Transition period: interpolate */
float a = (TRANSITION_LOW - elevation) /
(TRANSITION_LOW - TRANSITION_HIGH);
temp = (1.0-a)*temp_night + a*temp_day;
if (verbose) {
printf("Period: Transition (%.2f%% day)\n", a*100);
}
} else {
temp = temp_day;
if (verbose) printf("Period: Daytime\n");
}
return temp;
}
static int
adjust_temperature(int screen_num, int use_randr, int temp, float gamma[3])
{
/* Set color temperature */
int failed = 0;
#ifdef ENABLE_RANDR
if (use_randr) {
/* Check RANDR extension. */
int r = randr_check_extension();
if (r < 0) {
fprintf(stderr, "RANDR 1.3 extension is"
" not available.\n");
failed = 1;
} else {
r = randr_set_temperature(screen_num, temp, gamma);
if (r < 0) {
fprintf(stderr, "Unable to set color"
" temperature with RANDR.\n");
failed = 1;
}
}
}
#endif
#ifdef ENABLE_VIDMODE
if (!use_randr || failed) {
failed = 0;
/* Check VidMode extension */
r = vidmode_check_extension();
if (r < 0) {
fprintf(stderr, "VidMode extension is"
" not available.\n");
failed = 1;
} else {
r = vidmode_set_temperature(screen_num, temp, gamma);
if (r < 0) {
fprintf(stderr, "Unable to set color"
" temperature with VidMode.\n");
failed = 1;
}
}
}
#endif
if (failed) {
fprintf(stderr, "Color temperature adjustment failed.\n");
exit(EXIT_FAILURE);
}
}
int
main(int argc, char *argv[])
{
@@ -105,6 +183,8 @@ main(int argc, char *argv[])
float gamma[3] = { DEFAULT_GAMMA, DEFAULT_GAMMA, DEFAULT_GAMMA };
int use_randr = 1;
int screen_num = -1;
int init_trans = 1;
int one_shot = 0;
int verbose = 0;
char *s;
@@ -115,7 +195,7 @@ main(int argc, char *argv[])
/* Parse arguments. */
int opt;
while ((opt = getopt(argc, argv, "g:hl:m:s:t:v")) != -1) {
while ((opt = getopt(argc, argv, "g:hl:m:ors:t:v")) != -1) {
switch (opt) {
case 'g':
s = strchr(optarg, ':');
@@ -178,6 +258,12 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
break;
case 'o':
one_shot = 1;
break;
case 'r':
init_trans = 0;
break;
case 's':
screen_num = atoi(optarg);
break;
@@ -252,82 +338,56 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
/* Current angular elevation of the sun */
time_t now = time(NULL);
double elevation = solar_elevation(now, lat, lon);
if (verbose) {
printf("Solar elevation: %f%lc\n", elevation, DEG_CHAR);
}
/* Use elevation of sun to set color temperature */
int temp = 0;
if (elevation < TRANSITION_LOW) {
temp = temp_night;
if (verbose) printf("Period: Night\n");
} else if (elevation < TRANSITION_HIGH) {
/* Transition period: interpolate */
float a = (TRANSITION_LOW - elevation) /
(TRANSITION_LOW - TRANSITION_HIGH);
temp = (1.0-a)*temp_night + a*temp_day;
if (verbose) {
printf("Period: Transition (%.2f%% day)\n", a*100);
}
} else {
temp = temp_day;
if (verbose) printf("Period: Daytime\n");
}
if (verbose) {
printf("Color temperature: %uK\n", temp);
printf("Gamma: %.3f, %.3f, %.3f\n",
gamma[0], gamma[1], gamma[2]);
}
/* Set color temperature */
int failed = 0;
#ifdef ENABLE_RANDR
if (use_randr) {
/* Check RANDR extension. */
int r = randr_check_extension();
if (r < 0) {
fprintf(stderr, "RANDR 1.3 extension is"
" not available.\n");
failed = 1;
} else {
r = randr_set_temperature(screen_num, temp, gamma);
if (r < 0) {
fprintf(stderr, "Unable to set color"
" temperature with RANDR.\n");
failed = 1;
}
}
}
#endif
if (one_shot) {
/* Current angular elevation of the sun */
time_t now = time(NULL);
double elevation = solar_elevation(now, lat, lon);
#ifdef ENABLE_VIDMODE
if (!use_randr || failed) {
failed = 0;
/* Check VidMode extension */
r = vidmode_check_extension();
if (r < 0) {
fprintf(stderr, "VidMode extension is"
" not available.\n");
failed = 1;
} else {
r = vidmode_set_temperature(screen_num, temp, gamma);
if (r < 0) {
fprintf(stderr, "Unable to set color"
" temperature with VidMode.\n");
failed = 1;
}
if (verbose) {
printf("Solar elevation: %f%lc\n", elevation,
DEG_CHAR);
}
}
#endif
if (failed) {
fprintf(stderr, "Color temperature adjustment failed.\n");
exit(EXIT_FAILURE);
/* Use elevation of sun to set color temperature */
int temp = calculate_temp(elevation, temp_day, temp_night,
verbose);
if (verbose) printf("Color temperature: %uK\n", temp);
/* Adjust temperature */
adjust_temperature(screen_num, use_randr, temp, gamma);
} else {
/* Make a 10 second initial transition */
int short_trans_len = 10;
time_t short_trans_end = time(NULL) + short_trans_len;
while (1) {
/* Current angular elevation of the sun */
time_t now = time(NULL);
double elevation = solar_elevation(now, lat, lon);
/* Use elevation of sun to set color temperature */
int temp = calculate_temp(elevation, temp_day,
temp_night, verbose);
if (init_trans) {
float alpha = (short_trans_end - now) /
(float)short_trans_len;
if (alpha < 0) init_trans = 0; /* Done */
else temp = alpha*6500 + (1.0-alpha)*temp;
}
/* Adjust temperature */
adjust_temperature(screen_num, use_randr, temp, gamma);
if (init_trans) sleep(1);
else sleep(5);
}
}
return EXIT_SUCCESS;