From b4f442dfeaf4d434ae0d8459dc5199cd8fefc1c7 Mon Sep 17 00:00:00 2001
From: Wojciech Siewierski <wojciech.siewierski@onet.pl>
Date: Sun, 27 Mar 2016 23:50:07 +0200
Subject: [PATCH] Cut the memory consumption of PREVENT_STUCK_MODIFIERS in half

---
 tmk_core/common/action.c       |  6 +++---
 tmk_core/common/action.h       |  2 +-
 tmk_core/common/action_layer.c | 16 +++++++++-------
 tmk_core/common/action_layer.h |  3 +++
 4 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/tmk_core/common/action.c b/tmk_core/common/action.c
index fc09383ee..acc6d11ea 100644
--- a/tmk_core/common/action.c
+++ b/tmk_core/common/action.c
@@ -55,7 +55,7 @@ void action_exec(keyevent_t event)
 
 #if !defined(NO_ACTION_LAYER) && defined(PREVENT_STUCK_MODIFIERS)
 bool disable_action_cache = false;
-action_t pressed_actions_cache[MATRIX_ROWS][MATRIX_COLS];
+int8_t pressed_actions_cache[MATRIX_ROWS][MATRIX_COLS];
 
 void process_action_nocache(keyrecord_t *record)
 {
@@ -84,9 +84,9 @@ action_t store_or_get_action(bool pressed, keypos_t key)
     }
 
     if (pressed) {
-        pressed_actions_cache[key.row][key.col] = layer_switch_get_action(key);
+        pressed_actions_cache[key.row][key.col] = layer_switch_get_layer(key);
     }
-    return pressed_actions_cache[key.row][key.col];
+    return action_for_key(pressed_actions_cache[key.row][key.col], key);
 #else
     return layer_switch_get_action(key);
 #endif
diff --git a/tmk_core/common/action.h b/tmk_core/common/action.h
index 7a60f320e..2b43d001e 100644
--- a/tmk_core/common/action.h
+++ b/tmk_core/common/action.h
@@ -61,7 +61,7 @@ void action_function(keyrecord_t *record, uint8_t id, uint8_t opt);
 /* Utilities for actions.  */
 #if !defined(NO_ACTION_LAYER) && defined(PREVENT_STUCK_MODIFIERS)
 extern bool disable_action_cache;
-extern action_t pressed_actions_cache[MATRIX_ROWS][MATRIX_COLS];
+extern int8_t pressed_actions_cache[MATRIX_ROWS][MATRIX_COLS];
 #endif
 void process_action_nocache(keyrecord_t *record);
 void process_action(keyrecord_t *record);
diff --git a/tmk_core/common/action_layer.c b/tmk_core/common/action_layer.c
index c535615f4..76164adb5 100644
--- a/tmk_core/common/action_layer.c
+++ b/tmk_core/common/action_layer.c
@@ -111,8 +111,7 @@ void layer_debug(void)
 #endif
 
 
-
-action_t layer_switch_get_action(keypos_t key)
+int8_t layer_switch_get_layer(keypos_t key)
 {
     action_t action;
     action.code = ACTION_TRANSPARENT;
@@ -124,15 +123,18 @@ action_t layer_switch_get_action(keypos_t key)
         if (layers & (1UL<<i)) {
             action = action_for_key(i, key);
             if (action.code != ACTION_TRANSPARENT) {
-                return action;
+                return i;
             }
         }
     }
     /* fall back to layer 0 */
-    action = action_for_key(0, key);
-    return action;
+    return 0;
 #else
-    action = action_for_key(biton32(default_layer_state), key);
-    return action;
+    return biton32(default_layer_state);
 #endif
 }
+
+action_t layer_switch_get_action(keypos_t key)
+{
+    return action_for_key(layer_switch_get_layer(key), key);
+}
diff --git a/tmk_core/common/action_layer.h b/tmk_core/common/action_layer.h
index b6da353cf..1a313a259 100644
--- a/tmk_core/common/action_layer.h
+++ b/tmk_core/common/action_layer.h
@@ -71,6 +71,9 @@ void layer_xor(uint32_t state);
 #endif
 
 
+/* return the topmost non-transparent layer currently associated with key */
+int8_t layer_switch_get_layer(keypos_t key);
+
 /* return action depending on current layer status */
 action_t layer_switch_get_action(keypos_t key);