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Diffstat (limited to 'cg-rainbow.c')
| -rw-r--r-- | cg-rainbow.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/cg-rainbow.c b/cg-rainbow.c new file mode 100644 index 0000000..4cf4797 --- /dev/null +++ b/cg-rainbow.c @@ -0,0 +1,262 @@ +/* See LICENSE file for copyright and license details. */ +#include "cg-base.h" + +#include <libclut.h> + +#include <errno.h> +#include <math.h> +#include <sched.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> + + + +/** + * The default filter priority for the program + */ +const int64_t default_priority = (int64_t)1 << 60; + +/** + * The default class for the program + */ +char default_class[] = PKGNAME "::cg-rainbow::standard"; + +/** + * Class suffixes + */ +const char* const* class_suffixes = (const char* const[]){NULL}; + + + +/** + * -s: rainbow-frequency in Hz + */ +static char* sflag = NULL; + +/** + * -l: base luminosity + */ +static char* lflag = NULL; + +/** + * The rainbow-frequency multiplied by 3 + */ +double rainbows_per_third_second = 1; + +/** + * The base luminosity + */ +double luminosity = (double)1 / 3; + + + +/** + * Print usage information and exit + */ +void usage(void) +{ + fprintf(stderr, + "Usage: %s [-M method] [-S site] [-c crtc]... [-R rule] [-p priority]" + " [-l luminosity] [-s rainbowhz]\n", + argv0); + exit(1); +} + + +/** + * Handle a command line option + * + * @param opt The option, it is a NUL-terminate two-character + * string starting with either '-' or '+', if the + * argument is not recognised, call `usage`. This + * string will not be "-M", "-S", "-c", "-p", or "-R". + * @param arg The argument associated with `opt`, + * `NULL` there is no next argument, if this + * parameter is `NULL` but needed, call `usage` + * @return 0 if `arg` was not used, + * 1 if `arg` was used, + * -1 on error + */ +int handle_opt(char* opt, char* arg) +{ + if (opt[0] == '-') + switch (opt[1]) + { + case 'l': + if (lflag || !(lflag = arg)) + usage(); + return 1; + case 's': + if (sflag || !(sflag = arg)) + usage(); + return 1; + default: + usage(); + } + else + usage(); + return 0; +} + + +/** + * Parse a non-negative double encoded as a string + * + * @param out Output parameter for the value + * @param str The string + * @return Zero on success, -1 if the string is invalid + */ +static int parse_double(double* restrict out, const char* restrict str) +{ + char* end; + errno = 0; + *out = strtod(str, &end); + if (errno || (*out < 0) || isinf(*out) || isnan(*out) || *end) + return -1; + if (!*str || !strchr("0123456789.", *str)) + return -1; + return 0; +} + + +/** + * This function is called after the last + * call to `handle_opt` + * + * @param argc The number of unparsed arguments + * @param argv `NULL` terminated list of unparsed arguments + * @param prio The argument associated with the "-p" option + * @return Zero on success, -1 on error + */ +int handle_args(int argc, char* argv[], char* prio) +{ + int q = (lflag || sflag); + if ((q > 1) || argc) + usage(); + if (sflag != NULL) + { + if (parse_double(&rainbows_per_third_second, sflag) < 0) + usage(); + rainbows_per_third_second *= 3; + } + if (lflag != NULL) + { + if (parse_double(&luminosity, lflag) < 0) + usage(); + } + return 0; + (void) argv; + (void) prio; +} + + +/** + * Fill a filter + * + * @param filter The filter to fill + * @param red The red brightness + * @param green The green brightness + * @param blue The blue brightness + */ +static void fill_filter(libcoopgamma_filter_t* restrict filter, double red, double green, double blue) +{ + switch (filter->depth) + { +#define X(CONST, MEMBER, MAX, TYPE)\ + case CONST:\ + libclut_start_over(&(filter->ramps.MEMBER), MAX, TYPE, 1, 1, 1);\ + libclut_rgb_brightness(&(filter->ramps.MEMBER), MAX, TYPE, red, green, blue);\ + break; +LIST_DEPTHS +#undef X + default: + abort(); + } +} + + +/** + * Get the current monotonic time as a double + * + * @param now Output parameter for the current time (monotonic) + * @return Zero on success, -1 on error + */ +static int double_time(double* restrict now) +{ +#ifndef CLOCK_MONOTONIC_RAW +# define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC +#endif + struct timespec ts; + if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts) < 0) + return -1; + *now = (double)(ts.tv_nsec); + *now /= 1000000000L; + *now += (double)(ts.tv_sec); + return 0; +} + + +/** + * The main function for the program-specific code + * + * @return 0: Success + * -1: Error, `errno` set + * -2: Error, `cg.error` set + * -3: Error, message already printed + */ +int start(void) +{ + int r; + size_t i, j; + double pal[3]; + double t, starttime; + + for (i = 0; i < filters_n; i++) + crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_DEATH; + + if ((r = make_slaves()) < 0) + return r; + + if ((r = double_time(&starttime)) < 0) + return r; + + for (;;) + { + if ((r = double_time(&t)) < 0) + return r; + t -= starttime; + t *= rainbows_per_third_second; + pal[0] = pal[1] = pal[2] = luminosity; + pal[((long)t) % 3] += 1 - fmod(t, 1); + pal[((long)t + 1) % 3] += fmod(t, 1); + if (pal[0] > 1) pal[0] = 1; + if (pal[1] > 1) pal[1] = 1; + if (pal[2] > 1) pal[2] = 1; + + for (i = 0, r = 1; i < filters_n; i++) + { + if (!(crtc_updates[i].master) || !(crtc_info[crtc_updates[i].crtc].supported)) + continue; + fill_filter(&(crtc_updates[i].filter), pal[0], pal[1], pal[2]); + r = update_filter(i, 0); + if ((r == -2) || ((r == -1) && (errno != EAGAIN))) + return r; + if (crtc_updates[i].slaves != NULL) + for (j = 0; crtc_updates[i].slaves[j] != 0; j++) + { + r = update_filter(crtc_updates[i].slaves[j], 0); + if ((r == -2) || ((r == -1) && (errno != EAGAIN))) + return r; + } + } + + while (r != 1) + if ((r = synchronise(-1)) < 0) + return r; + + sched_yield(); + } +} |