Per application color saturation support (#21)

* Initial implementation without fullscreen support

* Limit saturation to 2

* Fixed saturation not working for fullscreen applications like CSGO

* Fixed saturation ignoring border radius

* Updated README and sway.5 man page

* Rebased from Master

* Added command to README

* Fixed nitpicks

1 files changed, 43 insertions, 0 deletions

diff --git a/sway/commands/saturation.c b/sway/commands/saturation.c
new file mode 100644
index 00000000..35f02128
--- /dev/null
+++ b/sway/commands/saturation.c
@@ -0,0 +1,43 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include "sway/commands.h"
+#include "sway/tree/view.h"
+#include "log.h"
+
+struct cmd_results *cmd_saturation(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "saturation", EXPECTED_AT_LEAST, 1))) {
+		return error;
+	}
+
+	struct sway_container *con = config->handler_context.container;
+
+	if (con == NULL) {
+		return cmd_results_new(CMD_FAILURE, "No current container");
+	}
+
+	char *err;
+	float val = strtof(argc == 1 ? argv[0] : argv[1], &err);
+	if (*err) {
+		return cmd_results_new(CMD_INVALID, "saturation float invalid");
+	}
+
+	if (!strcasecmp(argv[0], "plus")) {
+		val = con->saturation + val;
+	} else if (!strcasecmp(argv[0], "minus")) {
+		val = con->saturation - val;
+	} else if (argc > 1 && strcasecmp(argv[0], "set")) {
+		return cmd_results_new(CMD_INVALID,
+				"Expected: set|plus|minus <0..2>: %s", argv[0]);
+	}
+
+	if (val < 0 || val > 2) {
+		return cmd_results_new(CMD_FAILURE, "saturation value out of bounds");
+	}
+
+	con->saturation = val;
+	container_damage_whole(con);
+	return cmd_results_new(CMD_SUCCESS, NULL);
+}