Add 'output render_bit_depth [8|10]' command

This makes it possible to hint to the renderer and backends how many
bits per channel the buffers that the compositor draws windows onto
should have. Renderers and backends may deviate from this if they
do not support the formats with higher bit depth.

2 files changed, 30 insertions, 0 deletions

diff --git a/sway/commands/output.c b/sway/commands/output.c
index d8ef2885..42230bd7 100644
--- a/sway/commands/output.c
+++ b/sway/commands/output.c
@@ -18,6 +18,7 @@ static const struct cmd_handler output_handlers[] = {
 	{ "modeline", output_cmd_modeline },
 	{ "pos", output_cmd_position },
 	{ "position", output_cmd_position },
+	{ "render_bit_depth", output_cmd_render_bit_depth },
 	{ "res", output_cmd_mode },
 	{ "resolution", output_cmd_mode },
 	{ "scale", output_cmd_scale },
diff --git a/sway/commands/output/render_bit_depth.c b/sway/commands/output/render_bit_depth.c
new file mode 100644
index 00000000..c419321e
--- /dev/null
+++ b/sway/commands/output/render_bit_depth.c
@@ -0,0 +1,29 @@
+#include <drm_fourcc.h>
+#include <strings.h>
+#include "sway/commands.h"
+#include "sway/config.h"
+
+struct cmd_results *output_cmd_render_bit_depth(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 bit depth argument.");
+	}
+
+	if (strcmp(*argv, "8") == 0) {
+		config->handler_context.output_config->render_bit_depth =
+			RENDER_BIT_DEPTH_8;
+	} else if (strcmp(*argv, "10") == 0) {
+		config->handler_context.output_config->render_bit_depth =
+			RENDER_BIT_DEPTH_10;
+	} else {
+		return cmd_results_new(CMD_INVALID,
+			"Invalid bit depth. Must be a value in (8|10).");
+	}
+
+	config->handler_context.leftovers.argc = argc - 1;
+	config->handler_context.leftovers.argv = argv + 1;
+	return NULL;
+}
+