Reorganise, change license, portable makefile, and reference radharc

Signed-off-by: Mattias Andrée <maandree@kth.se>

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();
+    }
+}