From 0bdbe7385afeeb094588f407eac3b23467eaa92a Mon Sep 17 00:00:00 2001
From: Gergely Nagy <algernon@madhouse-project.org>
Date: Sun, 12 Feb 2017 22:34:01 +0100
Subject: [PATCH] Minor improvement for mergeLayers

We fill the cached `keyMap` with the value of `DefaultLayer`, so if that is the
only layer active, then we can bail out early.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
---
 src/layers.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/layers.cpp b/src/layers.cpp
index a37ede50..b1bfff86 100644
--- a/src/layers.cpp
+++ b/src/layers.cpp
@@ -57,6 +57,9 @@ Layer_::mergeLayers(void) {
 
     memset (keyMap, DefaultLayer, ROWS * COLS);
 
+    if (LayerState == (uint32_t)(1 << DefaultLayer))
+        return;
+
     for (uint8_t r = 0; r < ROWS; r++) {
         for (uint8_t c = 0; c < COLS; c++) {
             int8_t layer = highestLayer;