aboutsummaryrefslogtreecommitdiff
path: root/brightnessctl.c
diff options
context:
space:
mode:
authorGravatar Schnilz <47043622+Schnilz@users.noreply.github.com>2019-02-13 14:12:41 +0000
committerGravatar Mykyta Holubakha <hilobakho@gmail.com>2019-08-02 13:24:18 +0300
commit2e29a6468968aab9cccecb759e1aefa14b889fd1 (patch)
treed82f09e44a120120e92af0df8601e79c863c004e /brightnessctl.c
parenta0f1c90c9f8413e2e1ba38476ec0ea278bb06490 (diff)
Added a mapping function (exponent)
added -e / --exponent. As the perceived brightness change from 10% to 20% is not the same as 90% to 100%, there is now a float parameter--exponent / -e to set the mapping of the percentage form linear (as it was) to polynominal. (%=x^k*max*100^-k) k is the value that you can change now.
Diffstat (limited to 'brightnessctl.c')
-rw-r--r--brightnessctl.c52
1 files changed, 42 insertions, 10 deletions
diff --git a/brightnessctl.c b/brightnessctl.c
index 102b54c..ab87ef3 100644
--- a/brightnessctl.c
+++ b/brightnessctl.c
@@ -78,6 +78,7 @@ struct params {
bool mach;
bool save;
bool restore;
+ float exponent;
};
static struct params p;
@@ -89,6 +90,7 @@ static const struct option options[] = {
{"list", no_argument, NULL, 'l'},
{"machine-readable", no_argument, NULL, 'm'},
{"min-value", optional_argument, NULL, 'n'},
+ {"exponent", optional_argument, NULL, 'e'},
{"quiet", no_argument, NULL, 'q'},
{"pretend", no_argument, NULL, 'p'},
{"restore", no_argument, NULL, 'r'},
@@ -107,8 +109,9 @@ int main(int argc, char **argv) {
fail("Unable to determine current OS. Exiting!\n");
if (strcmp(name.sysname, "Linux"))
fail("This program only supports Linux.\n");
+ p.exponent = 1;
while (1) {
- if ((c = getopt_long(argc, argv, "lqpmn::srhVc:d:", options, NULL)) < 0)
+ if ((c = getopt_long(argc, argv, "lqpmn::e::srhVc:d:", options, NULL)) < 0)
break;
switch (c) {
case 'l':
@@ -135,6 +138,12 @@ int main(int argc, char **argv) {
else
p.min = 1;
break;
+ case 'e':
+ if (optarg)
+ p.exponent = atof(optarg);
+ else
+ p.exponent = 4;
+ break;
case 'h':
usage();
exit(EXIT_SUCCESS);
@@ -205,7 +214,7 @@ int main(int argc, char **argv) {
free(file_path);
}
if ((sys_run_dir = getenv("XDG_RUNTIME_DIR")))
- run_dir = dir_child(sys_run_dir, "brightnessctl");
+ run_dir = dir_child(sys_run_dir, "brightnessctl");
if (p.save)
if (!save_device_data(dev))
fprintf(stderr, "Could not save data for device '%s'.\n", dev->id);
@@ -296,32 +305,52 @@ void list_devices(struct device **devs) {
print_device(dev);
}
+float val_to_percent(long val,struct device *d) {
+ if (val < 0) return 0;
+ return powf(powf(100,p.exponent)*val/d->max_brightness,1.0f/p.exponent);
+}
+
+unsigned long percent_to_val(float percent,struct device *d) {
+ float r = (powf(percent,p.exponent)*d->max_brightness)*(powf(100,-p.exponent));
+ return r < 0 ? 0 : (unsigned long)r;
+}
+
void print_device(struct device *dev) {
char *format = p.mach ? "%s,%s,%d,%d%%,%d\n":
"Device '%s' of class '%s':\n\tCurrent brightness: %d (%d%%)\n\tMax brightness: %d\n\n";
fprintf(stdout, format,
dev->id, dev->class,
dev->curr_brightness,
- (int) (100.0 * dev->curr_brightness / dev-> max_brightness),
+ (int) val_to_percent(dev->curr_brightness,dev),
dev->max_brightness);
}
void apply_value(struct device *d, struct value *val) {
- long new, mod = val->v_type == ABSOLUTE ?
- val->val : ceil(val->val / 100.0 * d->max_brightness);
+ long new;
if (val->d_type == DIRECT) {
- new = mod > d->max_brightness ? d->max_brightness : mod;
- goto apply;
+ if(val->v_type == ABSOLUTE)
+ new = val->val > d->max_brightness ? d->max_brightness : val->val;
+ else
+ new = percent_to_val(val->val,d);
+ } else {//DELTA
+ if(val->v_type == ABSOLUTE) {
+ new = d->curr_brightness + (val->sign == PLUS ? val->val : -val->val);
+ } else {
+ new = percent_to_val(val_to_percent(d->curr_brightness,d) + ((long)(val->sign == PLUS ? val->val : -val->val)),d);
+ if(new == d->curr_brightness) {
+ if(val->sign == PLUS)
+ new += 1;
+ else
+ new -= 1;
+ }
+ }
}
- mod *= val->sign == PLUS ? 1 : -1;
- new = d->curr_brightness + mod;
if (new < p.min)
new = p.min;
if (new < 0)
new = 0;
if (new > d->max_brightness)
new = d->max_brightness;
-apply:
d->curr_brightness = new;
}
@@ -569,6 +598,9 @@ Options:\n\
-p, --pretend\t\t\tdo not perform write operations.\n\
-m, --machine-readable\tproduce machine-readable output.\n\
-n, --min-value\t\tset minimum brightness, defaults to 1.\n\
+ -e, --exponent\t\tchange percent value mapping to polynominal.\n\
+ \t\t\t%%=x^k*max*100^-k, k defaults to 4.\n\
+ \t\t\tTry changing the value until the changes \"feel\" equal.\n\
-s, --save\t\t\tsave previous state in a temporary file.\n\
-r, --restore\t\t\trestore previous saved state.\n\
-h, --help\t\t\tprint this help.\n\