1 files changed, 85 insertions, 0 deletions
diff --git a/libcoopgamma_set_gamma_send.c b/libcoopgamma_set_gamma_send.c
new file mode 100644
index 0000000..d6daf91
--- /dev/null
+++ b/libcoopgamma_set_gamma_send.c
@@ -0,0 +1,85 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Apply, update, or remove a gamma ramp adjustment, send request part
+ * 
+ * Cannot be used before connecting to the server
+ * 
+ * @param   filter  The filter to apply, update, or remove, gamma ramp meta-data must match the CRTC's
+ * @param   ctx     The state of the library, must be connected
+ * @param   async   Information about the request, that is needed to
+ *                  identify and parse the response, is stored here
+ * @return          Zero on success, -1 on error
+ */
+int
+libcoopgamma_set_gamma_send(const libcoopgamma_filter_t *restrict filter, libcoopgamma_context_t *restrict ctx,
+                            libcoopgamma_async_context_t *restrict async)
+{
+	const void *payload = NULL;
+	const char *lifespan;
+	char priority[sizeof("Priority: \n") + 3 * sizeof(int64_t)] = {'\0'};
+	char length  [sizeof("Length: \n")   + 3 * sizeof(size_t) ] = {'\0'};
+	size_t payload_size = 0, stopwidth = 0;
+
+#if defined(__GNUC__) && !defined(__clang__)
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wnonnull-compare"
+#endif
+	if (!filter || !filter->crtc || strchr(filter->crtc, '\n') || !filter->class || strchr(filter->class, '\n')) {
+		errno = EINVAL;
+		goto fail;
+	}
+#if defined(__GNUC__) && !defined(__clang__)
+# pragma GCC diagnostic pop
+#endif
+
+	switch (filter->lifespan) {
+	case LIBCOOPGAMMA_REMOVE:        lifespan = "remove";        break;
+	case LIBCOOPGAMMA_UNTIL_DEATH:   lifespan = "until-death";   break;
+	case LIBCOOPGAMMA_UNTIL_REMOVAL: lifespan = "until-removal"; break;
+	default:
+		errno = EINVAL;
+		goto fail;
+	}
+
+	if (filter->lifespan != LIBCOOPGAMMA_REMOVE) {
+		switch (filter->depth) {
+		case LIBCOOPGAMMA_FLOAT:  stopwidth = sizeof(float);  break;
+		case LIBCOOPGAMMA_DOUBLE: stopwidth = sizeof(double); break;
+		default: INTEGRAL_DEPTHS
+			if (filter->depth <= 0 || (filter->depth & 7)) {
+				errno = EINVAL;
+				goto fail;
+			}
+			stopwidth = (size_t)(filter->depth / 8);
+			break;
+		}
+
+		payload_size  = filter->ramps.u8.red_size;
+		payload_size += filter->ramps.u8.green_size;
+		payload_size += filter->ramps.u8.blue_size;
+		payload_size *= stopwidth;
+		payload = filter->ramps.u8.red;
+		sprintf(priority, "Priority: %" PRIi64 "\n", filter->priority);
+		sprintf(length, "Length: %zu\n", payload_size);
+	}
+
+	async->message_id = ctx->message_id;
+	SEND_MESSAGE(ctx, payload, payload_size,
+	             "Command: set-gamma\n"
+	             "Message ID: %" PRIu32 "\n"
+	             "CRTC: %s\n"
+	             "Class: %s\n"
+	             "Lifespan: %s\n"
+	             "%s"
+	             "%s"
+	             "\n",
+	             ctx->message_id, filter->crtc, filter->class, lifespan, priority, length);
+
+	return 0;
+fail:
+	copy_errno(ctx);
+	return -1;
+}