split out and doc adjustment method functions from test.c

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 189 insertions, 0 deletions

diff --git a/src/test/methods.c b/src/test/methods.c
new file mode 100644
index 0000000..a00b7c3
--- /dev/null
+++ b/src/test/methods.c
@@ -0,0 +1,189 @@
+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "methods.h"
+
+#include <libgamma.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+/**
+ * Get the name representation of an
+ * adjustment method by its identifier.
+ * 
+ * @param   method  The identifier of the adjustment method.
+ * @return          The name of the adjustment method, should not be `free`:d.
+ */
+const char* method_name(int method)
+{
+  switch (method)
+    {
+    case LIBGAMMA_METHOD_DUMMY:                 return "dummy";
+    case LIBGAMMA_METHOD_X_RANDR:               return "RandR X extension";
+    case LIBGAMMA_METHOD_X_VIDMODE:             return "VidMode X extension";
+    case LIBGAMMA_METHOD_LINUX_DRM:             return "Linux DRM";
+    case LIBGAMMA_METHOD_W32_GDI:               return "Windows GDI";
+    case LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS:  return "Quartz using CoreGraphics";
+    default:
+      return "(unknown)";
+    }
+}
+
+
+/**
+ * Print a list of adjustment methods.
+ * 
+ * @param  description  Precursory text for the list.
+ * @param  methods      An array allocated to fit all adjustment methods.
+ * @param  operation    See the `operation` parameter for `libgamma_list_methods`.
+ */
+void list_methods(const char* description, int* methods, int operation)
+{
+  /* Get adjustment method list. */
+  size_t i, n = libgamma_list_methods(methods, LIBGAMMA_METHOD_COUNT, operation);
+  
+  /* Print adjustment method list. */
+  printf("%s:\n", description);
+  for (i = 0; i < n; i++)
+    printf("  %s\n", method_name(methods[i]));
+  printf("\n");
+}
+
+
+/**
+ * Print all lists, of adjustments methods, that
+ * are made available by `libgamma_list_methods`.
+ */
+void list_methods_lists(void)
+{
+  /* Allocate a list for adjustment methods that is
+     large enough if the program is up to date with
+     the library. */
+  int* methods = malloc(LIBGAMMA_METHOD_COUNT * sizeof(int));
+  /* Get a list of all adjustment methods. */
+  size_t n = libgamma_list_methods(methods, LIBGAMMA_METHOD_COUNT, 4);
+  
+  /* If we got more adjustment methods than we expected
+     the program needs to be recompiled, and we need to
+     reallocate the list so it is large enough. */
+  if (n > LIBGAMMA_METHOD_COUNT)
+    {
+      printf("Warning: you should to recompile the program, libgamma has been updated.\n");
+      methods = realloc(methods, n * sizeof(int));
+    }
+  
+  /* Print adjustment method lists. */
+  list_methods("Available adjustment methods",               methods, 4);
+  list_methods("Available real adjustment methods",          methods, 3);
+  list_methods("Available real non-fake adjustment methods", methods, 2);
+  list_methods("Recommended adjustment methods",             methods, 1);
+  list_methods("Recommended non-fake adjustment methods",    methods, 0);
+  
+  free(methods);
+}
+
+
+/**
+ * Test the availability (determined
+ * at compile-time) of all adjustment
+ * methods and one that does not exist.
+ */
+void method_availability(void)
+{
+  int method;
+  /* The availability of an adjustmen method
+     whose identifier is invalid. It should
+     say it is not available. */
+  printf("Testing the availability of a non-existing adjustment method: ");
+  printf("%s\n", libgamma_is_method_available(-1) ? "available" : "not available");
+  
+  /* Test the availability  of the adjustment
+     methods that does exist. */
+  for (method = 0; method < LIBGAMMA_METHOD_COUNT; method++)
+    {
+      printf("Testing the availability of %s: ", method_name(method));
+      printf("%s\n", libgamma_is_method_available(method) ? "available" : "not available");
+    }
+  printf("\n");
+}
+
+
+/**
+ * List the default site and the environment
+ * variable, if any, that determines the
+ * default site, for all availiable adjustment
+ * methods.
+ */
+void list_default_sites(void)
+{
+  int method;
+  for (method = 0; method < LIBGAMMA_METHOD_COUNT; method++)
+    /* Include only available adjustment methods.
+       If an adjustment method is not available
+       it should print "(null)", but as that can
+       be misguiding we exclude those methods. */
+    if (libgamma_is_method_available(method))
+      {
+	printf("Default site for %s:\n", method_name(method));
+	printf("  Variable: %s\n", libgamma_method_default_site_variable(method));
+	printf("  Site name: %s\n", libgamma_method_default_site(method));
+	printf("\n");
+      }
+}
+
+
+/**
+ * Print the capabilities of all availiable
+ * adjustment methods.
+ */
+void method_capabilities(void)
+{
+  libgamma_method_capabilities_t caps;
+  int method;
+  for (method = 0; method < LIBGAMMA_METHOD_COUNT; method++)
+    if (libgamma_is_method_available(method))
+      {
+	/* Print adjustment method name and get the
+	   adjustment method's capabilities. */
+	printf("Capabilities of %s:\n", method_name(method));
+	libgamma_method_capabilities(&caps, method);
+	
+	/* Print capabilities. The CRTC information
+	   capabilities is printed hexadecimal. See
+	   the `LIBGAMMA_CRTC_INFO_*` definitions in
+	   `src/lib/libgamma-method.h` for what each
+	   bit represents. */
+	printf("  %s: %X\n", "CRTC information",      caps.crtc_information);
+	printf("  %s: %s\n", "Default site known",    caps.default_site_known            ? "yes" : "no");
+	printf("  %s: %s\n", "Multiple sites",        caps.multiple_sites                ? "yes" : "no");
+	printf("  %s: %s\n", "Multiple partitions",   caps.multiple_partitions           ? "yes" : "no");
+	printf("  %s: %s\n", "Multiple crtcs",        caps.multiple_crtcs                ? "yes" : "no");
+	printf("  %s: %s\n", "Graphics cards",        caps.partitions_are_graphics_cards ? "yes" : "no");
+	printf("  %s: %s\n", "Site restore",          caps.site_restore                  ? "yes" : "no");
+	printf("  %s: %s\n", "Partition restore",     caps.partition_restore             ? "yes" : "no");
+	printf("  %s: %s\n", "CRTC restore",          caps.crtc_restore                  ? "yes" : "no");
+	printf("  %s: %s\n", "Identical gamma sizes", caps.identical_gamma_sizes         ? "yes" : "no");
+	printf("  %s: %s\n", "Fixed gamma size",      caps.fixed_gamma_size              ? "yes" : "no");
+	printf("  %s: %s\n", "Fixed gamma depth",     caps.fixed_gamma_depth             ? "yes" : "no");
+	printf("  %s: %s\n", "Real method",           caps.real                          ? "yes" : "no");
+	printf("  %s: %s\n", "Fake method",           caps.fake                          ? "yes" : "no");
+	printf("\n");
+      }
+}
+