nvapi: proper rgb color dimm function

nvml.cpp

@@ -1816,6 +1816,13 @@ int gpu_info(struct cgpu_info *gpu)
 
 #endif /* USE_WRAPNVML */
 
+static int rgb_percent(int RGB, int percent)
+{
+	uint8_t* comp = (uint8_t*) &RGB;
+	int res = ((comp[2] * percent) / 100) << 16;
+	res += ((comp[1] * percent) / 100) << 8;
+	return res + ((comp[0] * percent) / 100);
+}
 
 void gpu_led_on(int dev_id)
 {
@@ -1831,8 +1838,7 @@ void gpu_led_on(int dev_id)
 void gpu_led_percent(int dev_id, int percent)
 {
 #if defined(WIN32) && defined(USE_WRAPNVML)
-	// todo rgb percent function (byte per byte)
-	int value = device_led[dev_id] > 100 ? device_led[dev_id] ^ 0x808080 : (device_led[dev_id] * percent)/100;
+	int value = device_led[dev_id] > 100 ? rgb_percent(device_led[dev_id], percent) : (device_led[dev_id] * percent)/100;
 	if (device_led_state[dev_id] != value) {
 		if (nvapi_set_led(nvapi_dev_map[dev_id], value, device_name[dev_id]) == 0)
 			device_led_state[dev_id] = value;