Add support for manually setting subpixel hinting on outputs.

Many laptop screens report unknown subpixel order. Allow users to manually set subpixel hinting to work around this.

Addresses https://github.com/swaywm/sway/issues/3163

1 files changed, 36 insertions, 0 deletions

diff --git a/sway/commands/output/subpixel.c b/sway/commands/output/subpixel.c
new file mode 100644
index 00000000..63191ee6
--- /dev/null
+++ b/sway/commands/output/subpixel.c
@@ -0,0 +1,36 @@
+#include <string.h>
+#include "log.h"
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/output.h"
+
+struct cmd_results *output_cmd_subpixel(int argc, char **argv) {
+        if (!config->handler_context.output_config) {
+                return cmd_results_new(CMD_FAILURE, "Missing output config");
+        }
+        if (!argc) {
+                return cmd_results_new(CMD_INVALID, "Missing subpixel argument.");
+        }
+        enum wl_output_subpixel subpixel;
+
+        if (strcmp(*argv, "rgb") == 0) {
+                subpixel = WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB;
+        } else if (strcmp(*argv, "bgr") == 0) {
+                subpixel = WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR;
+        } else if (strcmp(*argv, "vrgb") == 0) {
+                subpixel = WL_OUTPUT_SUBPIXEL_VERTICAL_RGB;
+        } else if (strcmp(*argv, "vbgr") == 0) {
+                subpixel = WL_OUTPUT_SUBPIXEL_VERTICAL_BGR;
+        } else if (strcmp(*argv, "none") == 0) {
+                subpixel = WL_OUTPUT_SUBPIXEL_NONE;
+        } else {
+                return cmd_results_new(CMD_INVALID, "Invalid output subpixel.");
+        }
+
+        struct output_config *oc = config->handler_context.output_config;
+        config->handler_context.leftovers.argc = argc - 1;
+        config->handler_context.leftovers.argv = argv + 1;
+
+        oc->subpixel = subpixel;
+        return NULL;
+}