add cg-darkroom

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

1 files changed, 323 insertions, 0 deletions

diff --git a/src/cg-darkroom.c b/src/cg-darkroom.c
new file mode 100644
index 0000000..064f21b
--- /dev/null
+++ b/src/cg-darkroom.c
@@ -0,0 +1,323 @@
+/**
+ * cg-tools -- Cooperative gamma-enabled tools
+ * Copyright (C) 2016  Mattias Andrée (maandree@kth.se)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "cg-base.h"
+
+#include <libclut.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+
+/**
+ * The default filter priority for the program
+ */
+const int64_t default_priority = ((int64_t)3) << 61;
+
+/**
+ * The default class for the program
+ */
+char* const default_class = PKGNAME "::cg-darkroom::standard";
+
+
+
+/**
+ * -d: keep process alive and remove filter on death
+ */
+static int dflag = 0;
+
+/**
+ * -x: remove filter rather than adding it
+ */
+static int xflag = 0;
+
+/**
+ * The brilliance of the red channel
+ */
+static double value = 0.25;
+
+
+
+/**
+ * Print usage information and exit
+ */
+void usage(void)
+{
+  fprintf(stderr,
+	  "Usage: %s [-M method] [-S site] [-c crtc]... [-R rule] "
+	  "(-d | [-p priority] [-x] [brightness])\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 'd':
+	if (dflag || xflag)
+	  usage();
+	dflag = 1;
+	break;
+      case 'x':
+	if (xflag || dflag)
+	  usage();
+	xflag = 1;
+	break;
+      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
+ * @retunr       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 (!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   method  The argument associated with the "-M" option
+ * @param   site    The argument associated with the "-S" option
+ * @param   crtcs   The arguments associated with the "-c" options, `NULL`-terminated
+ * @param   prio    The argument associated with the "-p" option
+ * @param   rule    The argument associated with the "-R" option
+ * @return          Zero on success, -1 on error
+ */
+int handle_args(int argc, char* argv[], char* method, char* site,
+		char** crtcs, char* prio, char* rule)
+{
+  char* red;
+  char* green;
+  char* blue;
+  int q = xflag + dflag;
+  q += (method != NULL) &&  !strcmp(method, "?");
+  q += (prio   != NULL) &&  !strcmp(prio, "?");
+  q += (rule   != NULL) && (!strcmp(rule, "?") || !strcmp(rule, "??"));
+  for (; *crtcs; crtcs++)
+    q += !strcmp(*crtcs, "?");
+  if ((q > 1) || (xflag && (prio != NULL || argc)))
+    usage();
+  if (argc == 1)
+    {
+      if (parse_double(&value, argv[0]) < 0)
+	usage();
+    }
+  else if (argc)
+    usage();
+  return 0;
+}
+
+
+/**
+ * Fill a filter
+ * 
+ * @param   The filter to fill
+ * @return  Zero on success, -1 on error
+ */
+static int fill_filter(libcoopgamma_filter_t* restrict filter)
+{
+  union libcoopgamma_ramps dramps;
+  size_t size;
+  
+  if ((0 <= value) && (value <= 1))
+    {
+      switch (filter->depth)
+	{
+#define X(CONST, MEMBER, MAX, TYPE)\
+	case CONST:\
+	  libclut_negative(&(filter->ramps.MEMBER), MAX, TYPE, 1, 0, 0);\
+	  libclut_rgb_brightness(&(filter->ramps.MEMBER), MAX, TYPE, 1, 0, 0);\
+	  libclut_cie_brightness(&(filter->ramps.MEMBER), MAX, TYPE, value, value, value);\
+	  break;
+LIST_DEPTHS
+#undef X
+	default:
+	  abort();
+	}
+      return 0;
+    }
+  if (filter->depth == LIBCOOPGAMMA_DOUBLE)
+    {
+      libclut_negative(&(filter->ramps.d), (double)1, double, 1, 0, 0);
+      libclut_rgb_brightness(&(filter->ramps.d), (double)1, double, 1, 0, 0);
+      libclut_cie_brightness(&(filter->ramps.d), (double)1, double, value, value, value);
+      libclut_clip(&(filter->ramps.d), (double)1, double, 1, 0, 0);
+      return 0;
+    }
+  if (filter->depth == LIBCOOPGAMMA_FLOAT)
+    {
+      libclut_negative(&(filter->ramps.f), (float)1, float, 1, 0, 0);
+      libclut_rgb_brightness(&(filter->ramps.f), (float)1, float, 1, 0, 0);
+      libclut_cie_brightness(&(filter->ramps.f), (float)1, float, value, value, value);
+      libclut_clip(&(filter->ramps.f), (float)1, float, 1, 0, 0);
+      return 0;
+    }  
+  
+  size  = dramps.d.red_size   = filter->ramps.d.red_size;
+  size += dramps.d.green_size = filter->ramps.d.green_size;
+  size += dramps.d.blue_size  = filter->ramps.d.blue_size;
+  dramps.d.red = calloc(size, sizeof(double));
+  if (dramps.d.red == NULL)
+    return -1;
+  dramps.d.green = dramps.d.red   + dramps.d.red_size;
+  dramps.d.blue  = dramps.d.green + dramps.d.green_size;
+  
+  libclut_start_over(&(dramps.d), (double)1, double, 1, 0, 0);
+  libclut_negative(&(dramps.d), (double)1, double, 1, 0, 0);
+  libclut_rgb_brightness(&(dramps.d), (double)1, double, 1, 0, 0);
+  libclut_cie_brightness(&(dramps.d), (double)1, double, value, value, value);
+  libclut_clip(&(dramps.d), (double)1, double, 1, 0, 0);
+  
+  switch (filter->depth)
+    {
+    case LIBCOOPGAMMA_UINT8:
+      libclut_translate(&(filter->ramps.u8), UINT8_MAX, uint8_t, &(dramps.d), (double)1, double);
+      break;
+    case LIBCOOPGAMMA_UINT16:
+      libclut_translate(&(filter->ramps.u16), UINT16_MAX, uint16_t, &(dramps.d), (double)1, double);
+      break;
+    case LIBCOOPGAMMA_UINT32:
+      libclut_translate(&(filter->ramps.u32), UINT32_MAX, uint32_t, &(dramps.d), (double)1, double);
+      break;
+    case LIBCOOPGAMMA_UINT64:
+      libclut_translate(&(filter->ramps.u64), UINT64_MAX, uint64_t, &(dramps.d), (double)1, double);
+      break;
+    default:
+      abort();
+    }
+  
+  free(dramps.d.red);
+  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;
+  
+  if (xflag)
+    for (i = 0; i < crtcs_n; i++)
+      crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_REMOVE;
+  else if (dflag)
+    for (i = 0; i < crtcs_n; i++)
+      crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_DEATH;
+  else
+    for (i = 0; i < crtcs_n; i++)
+      crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_REMOVAL;
+  
+  if (!xflag)
+    if ((r = make_slaves()) < 0)
+      return r;
+  
+  for (i = 0, r = 1; i < crtcs_n; i++)
+    {
+      if (!(crtc_updates[i].master) || !(crtc_info[i].supported))
+	continue;
+      if (!xflag)
+	if ((r = fill_filter(&(crtc_updates[i].filter))) < 0)
+	  return r;
+      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;
+  
+  if (!dflag)
+    return 0;
+  
+  if (libcoopgamma_set_nonblocking(&cg, 0) < 0)
+    return -1;
+  for (;;)
+    if (libcoopgamma_synchronise(&cg, NULL, 0, &j) < 0)
+      switch (errno)
+	{
+	case 0:
+	  break;
+	case ENOTRECOVERABLE:
+	  goto enotrecoverable;
+	default:
+	  return -1;
+	}
+  
+ enotrecoverable:
+  for (;;)
+    if (pause() < 0)
+      return -1;
+}
+