Beginning of cg-query

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

1 files changed, 346 insertions, 0 deletions

diff --git a/src/cg-query.c b/src/cg-query.c
new file mode 100644
index 0000000..b43613c
--- /dev/null
+++ b/src/cg-query.c
@@ -0,0 +1,346 @@
+/**
+ * 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/>.
+ */
+#define _DEFAULT_SOURCE
+#define _BSD_SOURCE
+
+#include "arg.h"
+
+#include <libcoopgamma.h>
+
+#include <errno.h>
+#include <inttypes.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+/**
+ * The libcoopgamma context
+ */
+static libcoopgamma_context_t cg;
+
+/**
+ * The name of the selected CRTC
+ */
+static char* crtc = NULL;
+
+
+
+/**
+ * Print usage information and exit
+ */
+void usage(void)
+{
+  fprintf(stderr,
+	  "Usage: %s [-M method] [-S site] -c crtc\n",
+	  argv0);
+  exit(1);
+}
+
+
+/**
+ * Initialise the process, specifically
+ * reset the signal mask and signal handlers
+ * 
+ * @return  Zero on success, -1 on error
+ */
+static int initialise_proc(void)
+{
+  sigset_t sigmask;
+  int sig;
+  
+  for (sig = 1; sig < _NSIG; sig++)
+    if (signal(sig, SIG_DFL) == SIG_ERR)
+      if (sig == SIGCHLD)
+	return -1;
+  
+  if (sigemptyset(&sigmask) < 0)
+    return -1;
+  if (sigprocmask(SIG_SETMASK, &sigmask, NULL) < 0)
+    return -1;
+  
+  return 0;
+}
+
+
+/**
+ * Print, to stdout, a list of all
+ * recognised adjustment methods
+ * 
+ * @return  Zero on success, -1 on error
+ */
+static int list_methods(void)
+{
+  char** list;
+  size_t i;
+  
+  list = libcoopgamma_get_methods();
+  if (list == NULL)
+    return -1;
+  for (i = 0; list[i]; i++)
+    printf("%s\n", list[i]);
+  free(list);
+  if (fflush(stdout) < 0)
+    return -1;
+  
+  return 0;
+}
+
+
+/**
+ * Print, to stdout, a list of all CRTC:s
+ * 
+ * A connection to the coopgamma server
+ * must have been made
+ * 
+ * @return  Zero on success, -1 on error, -2
+ *          on libcoopgamma error
+ */
+static int list_crtcs(void)
+{
+  char** list;
+  size_t i;
+  
+  list = libcoopgamma_get_crtcs_sync(&cg);
+  if (list == NULL)
+    return -2;
+  for (i = 0; list[i]; i++)
+    printf("%s\n", list[i]);
+  free(list);
+  if (fflush(stdout) < 0)
+    return -1;
+  
+  return 0;
+}
+
+
+/**
+ * Print, to stdout, information about
+ * the selected CRTC
+ * 
+ * @return  Zero on success, -1 on error, -2
+ *          on libcoopgamma error
+ */
+static int print_info(void)
+{
+  libcoopgamma_crtc_info_t info;
+  char* str;
+  int saved_errno;
+  
+  libcoopgamma_crtc_info_initialise(&info);
+  
+  if (libcoopgamma_get_gamma_info_sync(crtc, &info, &cg) < 0)
+    goto cg_fail;;
+  
+  printf("Cooperative gamma server running: %s\n",
+	 info.cooperative ? "yes" : "no");
+  
+  printf("Gamma adjustments supported: %s\n",
+	 info.supported == LIBCOOPGAMMA_MAYBE ? "maybe" : info.supported ? "yes" : "no");
+  
+  printf("Gamma ramps stops (red green blue): %zu %zu %zu\n",
+	 info.red_size, info.green_size, info.blue_size);
+  
+  switch (info.depth)
+    {
+    case LIBCOOPGAMMA_DOUBLE:  str = "double-precision floating-point";  break;
+    case LIBCOOPGAMMA_FLOAT:   str = "single-precision floating-point";  break;
+    case LIBCOOPGAMMA_UINT8:   str = "unsigned 8-bit integer";           break;
+    case LIBCOOPGAMMA_UINT16:  str = "unsigned 16-bit integer";          break;
+    case LIBCOOPGAMMA_UINT32:  str = "unsigned 32-bit integer";          break;
+    case LIBCOOPGAMMA_UINT64:  str = "unsigned 64-bit integer";          break;
+    default:
+      errno = EPROTO;
+      goto fail;
+    }
+  printf("Gamma ramps stops value type: %s\n", str);
+  
+  if (info.colourspace != LIBCOOPGAMMA_UNKNOWN)
+    {
+      switch (info.colourspace)
+	{
+	case LIBCOOPGAMMA_SRGB:     str = "sRGB";                              break;
+	case LIBCOOPGAMMA_RGB:      str = "non-standard RGB";                  break;
+	case LIBCOOPGAMMA_NON_RGB:  str = "non-RGB multicolour";               break;
+	case LIBCOOPGAMMA_GREY:     str = "monochrome or singlecolour scale";  break;
+	default:
+	  errno = EPROTO;
+	  goto fail;
+	}
+      printf("Monitor's colourspace: %s\n", str);
+    }
+  
+  if (info.have_gamut)
+    {
+      printf("Monitor's red colour: %lf, %lf\n",
+	     info.red_x / (double)1024, info.red_y / (double)1024);
+      
+      printf("Monitor's green colour: %lf, %lf\n",
+	     info.green_x / (double)1024, info.green_y / (double)1024);
+      
+      printf("Monitor's blue colour: %lf, %lf\n",
+	     info.blue_x / (double)1024, info.blue_y / (double)1024);
+    }
+  
+  return 0;
+ fail:
+  saved_errno = errno;
+  libcoopgamma_crtc_info_destroy(&info);
+  errno = saved_errno;
+  return -1;
+ cg_fail:
+  saved_errno = errno;
+  libcoopgamma_crtc_info_destroy(&info);
+  errno = saved_errno;
+  return -2;
+}
+
+
+/**
+ * -M METHOD
+ *     Select adjustment method. If METHOD is "?",
+ *     available methods will be printed to stdout.
+ * 
+ * -S SITE
+ *     Select site (display server instance).
+ * 
+ * -c CRTC
+ *     Select CRT controller. If CRTC is "?", CRTC:s
+ *     will be printed to stdout.
+ * 
+ * @param   argc  The number of command line arguments
+ * @param   argv  The command line arguments
+ * @return        0 on success, 1 on error
+ */
+int main(int argc, char* argv[])
+{
+  int stage = 0;
+  int rc = 0;
+  char* method = NULL;
+  char* site = NULL;
+  
+  ARGBEGIN
+    {
+    case 'M':
+      if (method != NULL)
+	usage();
+      method = EARGF(usage());
+      break;
+    case 'S':
+      if (site != NULL)
+	usage();
+      site = EARGF(usage());
+      break;
+    case 'c':
+      if (crtc != NULL)
+	usage();
+      crtc = EARGF(usage());
+      break;
+    }
+  ARGEND;
+  
+  if (initialise_proc() < 0)
+    goto fail;
+  
+  if ((method != NULL) && !strcmp(method, "?"))
+    {
+      if ((site != NULL) || (crtc != NULL))
+	usage();
+      if (list_methods() < 0)
+	goto fail;
+      return 0;
+    }
+  
+  if (libcoopgamma_context_initialise(&cg) < 0)
+    goto fail;
+  stage++;
+  if (libcoopgamma_connect(method, site, &cg) < 0)
+    {
+      fprintf(stderr, "%s: server failed to initialise\n", argv0);
+      goto custom_fail;
+    }
+  stage++;
+  
+  if (!crtc)
+    usage();
+  
+  if (!strcmp(crtc, "?"))
+    switch (list_crtcs())
+      {
+      case 0:
+	goto done;
+      case -1:
+	goto fail;
+      default:
+	goto cg_fail;
+      }
+  
+  switch (print_info())
+    {
+    case 0:
+      goto done;
+    case -1:
+      goto fail;
+    default:
+      goto cg_fail;
+    }
+  
+  fflush(stdout);
+  if (ferror(stdout))
+    goto fail;
+  if (fclose(stdout) < 0)
+    goto fail;
+  
+ done:
+  if (stage >= 1)
+    libcoopgamma_context_destroy(&cg, stage >= 2);
+  return rc;
+  
+ custom_fail:
+  rc = 1;
+  goto done;
+  
+ fail:
+  rc = 1;
+  perror(argv0);
+  goto done;
+  
+ cg_fail:
+  rc = 1;
+  {
+    const char* side = cg.error.server_side ? "server" : "client";
+    if (cg.error.custom)
+      {
+	if ((cg.error.number != 0) || (cg.error.description != NULL))
+	  fprintf(stderr, "%s: %s-side error number %" PRIu64 ": %s\n",
+		  argv0, side, cg.error.number, cg.error.description);
+	else if (cg.error.number != 0)
+	  fprintf(stderr, "%s: %s-side error number %" PRIu64 "\n", argv0, side, cg.error.number);
+	else if (cg.error.description != NULL)
+	  fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
+      }
+    else if (cg.error.description != NULL)
+      fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
+    else
+      fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, strerror(cg.error.number));
+  }
+  goto done;
+}
+