1 files changed, 134 insertions, 0 deletions
diff --git a/src/gamma.c b/src/gamma.c
new file mode 100644
index 0000000..508374b
--- /dev/null
+++ b/src/gamma.c
@@ -0,0 +1,134 @@
+/* redshift-ng - Automatically adjust display colour temperature according the Sun
+ * 
+ * Copyright (c) 2009-2018        Jon Lund Steffensen <jonlst@gmail.com>
+ * Copyright (c) 2014-2016, 2025  Mattias Andrée <m@maandree.se>
+ * 
+ * redshift-ng 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.
+ * 
+ * redshift-ng 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 redshift-ng.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "common.h"
+
+
+const struct gamma_method *gamma_methods[] = {
+#ifdef ENABLE_COOPGAMMA
+	&coopgamma_gamma_method,
+#endif
+#ifdef ENABLE_DRM
+	&drm_gamma_method,
+#endif
+#ifdef ENABLE_RANDR
+	&randr_gamma_method,
+#endif
+#ifdef ENABLE_VIDMODE
+	&vidmode_gamma_method,
+#endif
+#ifdef ENABLE_QUARTZ
+	&quartz_gamma_method,
+#endif
+#ifdef ENABLE_WINGDI
+	&w32gdi_gamma_method,
+#endif
+	&dummy_gamma_method,
+	NULL
+};
+
+
+static int
+try_start(const struct gamma_method *method, GAMMA_STATE **state,
+          enum program_mode mode, struct config_ini_state *config, char *args)
+{
+	struct config_ini_section *section;
+	struct config_ini_setting *setting;
+	char *next_arg, *value;
+	const char *key;
+
+	if (method->init(state) < 0) {
+		weprintf(_("Initialization of %s failed."), method->name);
+		return -1;
+	}
+
+	/* Set method options from config file. */
+	if ((section = config_ini_get_section(config, method->name)))
+		for (setting = section->settings; setting; setting = setting->next)
+			if (method->set_option(*state, setting->name, setting->value) < 0)
+				goto set_option_fail;
+
+	/* Set method options from command line. */
+	while (args) {
+		next_arg = strchr(args, ':');
+		if (next_arg)
+			*next_arg++ = '\0';
+
+		key = args;
+		value = strchr(args, '=');
+		if (!value) {
+			weprintf(_("Failed to parse option `%s'."), args);
+			return -1;
+		}
+		*value++ = '\0';
+
+		if (method->set_option(*state, key, value) < 0)
+			goto set_option_fail;
+
+		args = next_arg;
+	}
+
+	/* Start method. */
+	if (method->start(*state, mode) < 0) {
+		method->free(*state);
+		weprintf(_("Failed to start adjustment method %s."), method->name);
+		return -1;
+	}
+
+	return 0;
+
+set_option_fail:
+	method->free(*state);
+	weprintf(_("Failed to set %s option."), method->name);
+	/* TRANSLATORS: `help' must not be translated. */
+	weprintf(_("Try `-m %s:help' for more information."), method->name);
+	return -1;
+}
+
+
+void
+acquire_adjustment_method(struct settings *settings, GAMMA_STATE **method_state_out)
+{
+	size_t i;
+
+	if (settings->method) {
+		/* Use method specified on command line. */
+		if (try_start(settings->method, method_state_out, settings->mode, &settings->config, settings->method_args) < 0)
+			exit(1);
+	} else {
+		/* Try all methods, use the first that works. */
+		for (i = 0; gamma_methods[i]; i++) {
+			if (!gamma_methods[i]->autostart)
+				continue;
+
+			if (try_start(gamma_methods[i], method_state_out, settings->mode, &settings->config, NULL) < 0) {
+				weprintf(_("Trying next method..."));
+				continue;
+			}
+
+			/* Found method that works. */
+			printf(_("Using method `%s'.\n"), gamma_methods[i]->name);
+			settings->method = gamma_methods[i];
+			break;
+		}
+
+		/* Failure if no methods were successful at this point. */
+		if (!settings->method)
+			eprintf(_("No more methods to try."));
+	}
+}