Merge branch 'overlays'

11 files changed, 811 insertions, 318 deletions

diff --git a/common/action.c b/common/action.c
index 6528cd46c8..15e125a3ec 100644
--- a/common/action.c
+++ b/common/action.c
@@ -23,15 +23,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "command.h"
 #include "util.h"
 #include "debug.h"
+#include "layer_switch.h"
+#include "action_macro.h"
 #include "action.h"
 
 
-/* default layer indicates base layer */
-uint8_t default_layer = 0;
-/* current layer indicates active layer at this time */
-uint8_t current_layer = 0;
-
-
 static void process_action(keyrecord_t *record);
 static bool process_tapping(keyrecord_t *record);
 static void waiting_buffer_scan_tap(void);
@@ -207,28 +203,18 @@ void action_exec(keyevent_t event)
     }
 }
 
-static action_t get_action(key_t key)
-{
-    action_t action = action_for_key(current_layer, key);
-
-    /* Transparently use default layer */
-    if (action.code == ACTION_TRANSPARENT) {
-        // TODO: layer stacking
-        action = action_for_key(default_layer, key);
-        debug("TRNASPARENT: "); debug_hex16(action.code); debug("\n");
-    }
-    return action;
-}
-
 static void process_action(keyrecord_t *record)
 {
     keyevent_t event = record->event;
-    uint8_t tap_count = record->tap_count;
+    uint8_t tap_count = record->tap.count;
 
     if (IS_NOEVENT(event)) { return; }
 
-    action_t action = get_action(event.key);
-    debug("ACTION: "); debug_action(action); debug("\n");
+    action_t action = layer_switch_get_action(event.key);
+    debug("ACTION: "); debug_action(action);
+    debug(" overlays: "); overlay_debug();
+    debug(" keymaps: "); keymap_debug();
+    debug(" default_layer: "); debug_dec(default_layer); debug("\n");
 
     switch (action.kind.id) {
         /* Key and Mods */
@@ -287,7 +273,7 @@ static void process_action(keyrecord_t *record)
                         } else {
                             if (tap_count == 0) {
                                 debug("MODS_TAP: Oneshot: cancel/del_mods\n");
-                                // cancel oneshot by holding.
+                                // cancel oneshot on hold
                                 oneshot_cancel();
                                 del_mods(mods);
                             }
@@ -309,7 +295,7 @@ static void process_action(keyrecord_t *record)
                                 if (waiting_buffer_has_anykey_pressed()) {
                                     debug("MODS_TAP: Tap: Cancel: add_mods\n");
                                     // ad hoc: set 0 to cancel tap
-                                    record->tap_count = 0;
+                                    record->tap.count = 0;
                                     add_mods(mods);
                                 } else {
                                     debug("MODS_TAP: Tap: register_code\n");
@@ -368,145 +354,316 @@ static void process_action(keyrecord_t *record)
 #endif
             break;
 
-        /* Layer key */
-        case ACT_LAYER:
+        case ACT_KEYMAP:
             switch (action.layer.code) {
-                case LAYER_MOMENTARY:  /* momentary */
-                    if (event.pressed) {
-                        layer_switch(action.layer.val);
-                    }
-                    else {
-                        // NOTE: This is needed by legacy keymap support
-                        layer_switch(default_layer);
-                    }
-                    break;
-                case LAYER_ON_PRESS:
-                    if (event.pressed) {
-                        layer_switch(action.layer.val);
-                    }
-                    break;
-                case LAYER_ON_RELEASE:
-                    if (!event.pressed) {
-                        layer_switch(action.layer.val);
-                    }
-                    break;
-                case LAYER_DEFAULT:  /* default layer */
-                    switch (action.layer.val) {
-                        case DEFAULT_ON_BOTH:
-                            layer_switch(default_layer);
+                /* Keymap clear */
+                case OP_RESET:
+                    switch (action.layer.val & 0x03) {
+                        case 0:
+                            // NOTE: reserved
+                            overlay_clear();
+                            keymap_clear();
                             break;
-                        case DEFAULT_ON_PRESS:
+                        case ON_PRESS:
                             if (event.pressed) {
-                                layer_switch(default_layer);
+                                overlay_clear();
+                                keymap_clear();
                             }
                             break;
-                        case DEFAULT_ON_RELEASE:
+                        case ON_RELEASE:
                             if (!event.pressed) {
-                                layer_switch(default_layer);
+                                overlay_clear();
+                                keymap_clear();
                             }
                             break;
+                        case ON_BOTH:
+                            overlay_clear();
+                            keymap_clear();
+                            break;
+                        /* NOTE: 4-7 rserved */
                     }
                     break;
-                case LAYER_TAP_TOGGLE:  /* switch on hold and toggle on several taps */
+                /* Keymap Reset default layer */
+                case (OP_RESET | ON_PRESS):
+                    if (event.pressed) {
+                        default_layer_set(action.layer.val);
+                    }
+                    break;
+                case (OP_RESET | ON_RELEASE):
+                    if (!event.pressed) {
+                        default_layer_set(action.layer.val);
+                    }
+                    break;
+                case (OP_RESET | ON_BOTH):
+                    default_layer_set(action.layer.val);
+                    break;
+
+                /* Keymap Bit invert */
+                case OP_INV:
+                    /* with tap toggle */
                     if (event.pressed) {
                         if (tap_count < TAPPING_TOGGLE) {
-                            layer_switch(action.layer.val);
+                            debug("KEYMAP_INV: tap toggle(press).\n");
+                            keymap_invert(action.layer.val);
                         }
                     } else {
-                        if (tap_count >= TAPPING_TOGGLE) {
-                            debug("LAYER_PRESSED: tap toggle.\n");
-                            layer_switch(action.layer.val);
+                        if (tap_count <= TAPPING_TOGGLE) {
+                            debug("KEYMAP_INV: tap toggle(release).\n");
+                            keymap_invert(action.layer.val);
                         }
                     }
                     break;
-                case LAYER_CHANGE_DEFAULT:  /* change default layer */
+                case (OP_INV | ON_PRESS):
                     if (event.pressed) {
-                        default_layer = action.layer.val;
-                        layer_switch(default_layer);
+                        keymap_invert(action.layer.val);
+                    }
+                    break;
+                case (OP_INV | ON_RELEASE):
+                    if (!event.pressed) {
+                        keymap_invert(action.layer.val);
                     }
                     break;
-                default:    /* switch layer on hold and key on tap*/
+                case (OP_INV | ON_BOTH):
+                    keymap_invert(action.layer.val);
+                    break;
+
+                /* Keymap Bit on */
+                case OP_ON:
+                    if (event.pressed) {
+                        keymap_on(action.layer.val);
+                    } else {
+                        keymap_off(action.layer.val);
+                    }
+                    break;
+                case (OP_ON | ON_PRESS):
+                    if (event.pressed) {
+                        keymap_on(action.layer.val);
+                    }
+                    break;
+                case (OP_ON | ON_RELEASE):
+                    if (!event.pressed) {
+                        keymap_on(action.layer.val);
+                    }
+                    break;
+                case (OP_ON | ON_BOTH):
+                    keymap_on(action.layer.val);
+                    break;
+
+                /* Keymap Bit off */
+                case OP_OFF:
+                    if (event.pressed) {
+                        keymap_off(action.layer.val);
+                    } else {
+                        keymap_on(action.layer.val);
+                    }
+                    break;
+                case (OP_OFF | ON_PRESS):
+                    if (event.pressed) {
+                        keymap_off(action.layer.val);
+                    }
+                    break;
+                case (OP_OFF | ON_RELEASE):
+                    if (!event.pressed) {
+                        keymap_off(action.layer.val);
+                    }
+                    break;
+                case (OP_OFF | ON_BOTH):
+                    keymap_off(action.layer.val);
+                    break;
+
+                /* Keymap Bit set */
+                case OP_SET:
+                    if (event.pressed) {
+                        keymap_set(action.layer.val);
+                    } else {
+                        keymap_clear();
+                    }
+                    break;
+                case (OP_SET | ON_PRESS):
+                    if (event.pressed) {
+                        keymap_set(action.layer.val);
+                    }
+                    break;
+                case (OP_SET | ON_RELEASE):
+                    if (!event.pressed) {
+                        keymap_set(action.layer.val);
+                    }
+                    break;
+                case (OP_SET | ON_BOTH):
+                    keymap_set(action.layer.val);
+                    break;
+
+                /* Keymap Bit invert with tap key */
+                default:
                     if (event.pressed) {
-                       if (tap_count > 0) {
-                            debug("LAYER_PRESSED: Tap: register_code\n");
+                        if (tap_count > 0) {
+                            debug("KEYMAP_TAP_KEY: Tap: register_code\n");
                             register_code(action.layer.code);
-                       } else {
-                            debug("LAYER_PRESSED: No tap: layer_switch\n");
-                            layer_switch(action.layer.val);
-                       }
+                        } else {
+                            debug("KEYMAP_TAP_KEY: No tap: On on press\n");
+                            keymap_on(action.layer.val);
+                        }
                     } else {
                         if (tap_count > 0) {
-                            debug("LAYER_PRESSED: Tap: unregister_code\n");
+                            debug("KEYMAP_TAP_KEY: Tap: unregister_code\n");
                             unregister_code(action.layer.code);
                         } else {
-                            //debug("LAYER_PRESSED: No tap: NO ACTION\n");
-                            // NOTE: This is needed by legacy keymap support
-                            debug("LAYER_PRESSED: No tap: return to default layer\n");
-                            layer_switch(default_layer);
+                            debug("KEYMAP_TAP_KEY: No tap: Off on release\n");
+                            keymap_off(action.layer.val);
                         }
                     }
                     break;
             }
             break;
-        case ACT_LAYER_BIT:
+
+        case ACT_OVERLAY:
             switch (action.layer.code) {
-                case LAYER_MOMENTARY:  /* momentary */
-                    if (event.pressed) {
-                        layer_switch(current_layer ^ action.layer.val);
+                // Overlay Invert bit4
+                case OP_INV4 | 0:
+                    if (action.layer.val == 0) {
+                        // NOTE: reserved for future use
+                        overlay_clear();
                     } else {
-                        layer_switch(current_layer ^ action.layer.val);
+                        overlay_set(overlay_stat ^ action.layer.val);
                     }
                     break;
-                case LAYER_ON_PRESS:
-                    if (event.pressed) {
-                        layer_switch(current_layer ^ action.layer.val);
+                case OP_INV4 | 1:
+                    if (action.layer.val == 0) {
+                        // on pressed
+                        if (event.pressed) overlay_clear();
+                    } else {
+                        overlay_set(overlay_stat ^ action.layer.val<<4);
                     }
                     break;
-                case LAYER_ON_RELEASE:
-                    if (!event.pressed) {
-                        layer_switch(current_layer ^ action.layer.val);
+                case OP_INV4 | 2:
+                    if (action.layer.val == 0) {
+                        // on released
+                        if (!event.pressed) overlay_clear();
+                    } else {
+                        overlay_set(overlay_stat ^ action.layer.val<<8);
+                    }
+                    break;
+                case OP_INV4 | 3:
+                    if (action.layer.val == 0) {
+                        // on both
+                        overlay_clear();
+                    } else {
+                        overlay_set(overlay_stat ^ action.layer.val<<12);
                     }
                     break;
-                case LAYER_TAP_TOGGLE:  /* switch on hold and toggle on several taps */
+
+                /* Overlay Bit invert */
+                case OP_INV:
+                    /* with tap toggle */
                     if (event.pressed) {
                         if (tap_count < TAPPING_TOGGLE) {
-                            debug("LAYER_BIT: tap toggle(press).\n");
-                            layer_switch(current_layer ^ action.layer.val);
+                            debug("OVERLAY_INV: tap toggle(press).\n");
+                            overlay_invert(action.layer.val);
                         }
                     } else {
                         if (tap_count <= TAPPING_TOGGLE) {
-                            debug("LAYER_BIT: tap toggle(release).\n");
-                            layer_switch(current_layer ^ action.layer.val);
+                            debug("OVERLAY_INV: tap toggle(release).\n");
+                            overlay_invert(action.layer.val);
                         }
                     }
                     break;
-                case 0xFF:
-                    // change default layer
+                case (OP_INV | ON_PRESS):
+                    if (event.pressed) {
+                        overlay_invert(action.layer.val);
+                    }
+                    break;
+                case (OP_INV | ON_RELEASE):
+                    if (!event.pressed) {
+                        overlay_invert(action.layer.val);
+                    }
+                    break;
+                case (OP_INV | ON_BOTH):
+                    overlay_invert(action.layer.val);
+                    break;
+
+                /* Overlay Bit on */
+                case OP_ON:
                     if (event.pressed) {
-                        default_layer = current_layer ^ action.layer.val;
-                        layer_switch(default_layer);
+                        overlay_on(action.layer.val);
                     } else {
-                        default_layer = current_layer ^ action.layer.val;
-                        layer_switch(default_layer);
+                        overlay_off(action.layer.val);
+                    }
+                    break;
+                case (OP_ON | ON_PRESS):
+                    if (event.pressed) {
+                        overlay_on(action.layer.val);
                     }
                     break;
+                case (OP_ON | ON_RELEASE):
+                    if (!event.pressed) {
+                        overlay_on(action.layer.val);
+                    }
+                    break;
+                case (OP_ON | ON_BOTH):
+                    overlay_on(action.layer.val);
+                    break;
+
+                /* Overlay Bit off */
+                case OP_OFF:
+                    if (event.pressed) {
+                        overlay_off(action.layer.val);
+                    } else {
+                        overlay_on(action.layer.val);
+                    }
+                    break;
+                case (OP_OFF | ON_PRESS):
+                    if (event.pressed) {
+                        overlay_off(action.layer.val);
+                    }
+                    break;
+                case (OP_OFF | ON_RELEASE):
+                    if (!event.pressed) {
+                        overlay_off(action.layer.val);
+                    }
+                    break;
+                case (OP_OFF | ON_BOTH):
+                    overlay_off(action.layer.val);
+                    break;
+
+                /* Overlay Bit set */
+                case OP_SET:
+                    if (event.pressed) {
+                        overlay_move(action.layer.val);
+                    } else {
+                        overlay_clear();
+                    }
+                    break;
+                case (OP_SET | ON_PRESS):
+                    if (event.pressed) {
+                        overlay_move(action.layer.val);
+                    }
+                    break;
+                case (OP_SET | ON_RELEASE):
+                    if (!event.pressed) {
+                        overlay_move(action.layer.val);
+                    }
+                    break;
+                case (OP_SET | ON_BOTH):
+                    overlay_move(action.layer.val);
+                    break;
+
+                /* Overlay Bit invert with tap key */
                 default:
-                    // with tap key
                     if (event.pressed) {
-                        if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
-                            debug("LAYER_BIT: Tap: register_code\n");
+                        if (tap_count > 0) {
+                            debug("OVERLAY_TAP_KEY: Tap: register_code\n");
                             register_code(action.layer.code);
                         } else {
-                            debug("LAYER_BIT: No tap: layer_switch(bit on)\n");
-                            layer_switch(current_layer ^ action.layer.val);
+                            debug("OVERLAY_TAP_KEY: No tap: On on press\n");
+                            overlay_on(action.layer.val);
                         }
                     } else {
-                        if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
-                            debug("LAYER_BIT: Tap: unregister_code\n");
+                        if (tap_count > 0) {
+                            debug("OVERLAY_TAP_KEY: Tap: unregister_code\n");
                             unregister_code(action.layer.code);
                         } else {
-                            debug("LAYER_BIT: No tap: layer_switch(bit off)\n");
-                            layer_switch(current_layer ^ action.layer.val);
+                            debug("OVERLAY_TAP_KEY: No tap: Off on release\n");
+                            overlay_off(action.layer.val);
                         }
                     }
                     break;
@@ -515,7 +672,7 @@ static void process_action(keyrecord_t *record)
 
         /* Extentions */
         case ACT_MACRO:
-            // TODO
+            action_macro_play(action_get_macro(record, action.func.id, action.func.opt));
             break;
         case ACT_COMMAND:
             break;
@@ -540,16 +697,17 @@ static bool process_tapping(keyrecord_t *keyp)
     // if tapping
     if (IS_TAPPING_PRESSED()) {
         if (WITHIN_TAPPING_TERM(event)) {
-            if (tapping_key.tap_count == 0) {
+            if (tapping_key.tap.count == 0) {
                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
                     // first tap!
                     debug("Tapping: First tap(0->1).\n");
-                    tapping_key.tap_count = 1;
+                    tapping_key.tap.count = 1;
+                    tapping_key.tap.interrupted  = (waiting_buffer_has_anykey_pressed() ? true : false);
                     debug_tapping_key();
                     process_action(&tapping_key);
 
                     // enqueue
-                    keyp->tap_count = tapping_key.tap_count;
+                    keyp->tap = tapping_key.tap;
                     return false;
                 }
 #if TAPPING_TERM >= 500
@@ -573,19 +731,19 @@ static bool process_tapping(keyrecord_t *keyp)
             // tap_count > 0
             else {
                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
-                    debug("Tapping: Tap release("); debug_dec(tapping_key.tap_count); debug(")\n");
-                    keyp->tap_count = tapping_key.tap_count;
+                    debug("Tapping: Tap release("); debug_dec(tapping_key.tap.count); debug(")\n");
+                    keyp->tap = tapping_key.tap;
                     process_action(keyp);
                     tapping_key = *keyp;
                     debug_tapping_key();
                     return true;
                 }
                 else if (is_tap_key(keyp->event.key) && event.pressed) {
-                    if (tapping_key.tap_count > 1) {
+                    if (tapping_key.tap.count > 1) {
                         debug("Tapping: Start new tap with releasing last tap(>1).\n");
                         // unregister key
                         process_action(&(keyrecord_t){
-                                .tap_count = tapping_key.tap_count,
+                                .tap = tapping_key.tap,
                                 .event.key = tapping_key.event.key,
                                 .event.time = event.time,
                                 .event.pressed = false
@@ -609,7 +767,7 @@ static bool process_tapping(keyrecord_t *keyp)
         }
         // after TAPPING_TERM
         else {
-            if (tapping_key.tap_count == 0) {
+            if (tapping_key.tap.count == 0) {
                 debug("Tapping: End. Timeout. Not tap(0): ");
                 debug_event(event); debug("\n");
                 process_action(&tapping_key);
@@ -619,17 +777,17 @@ static bool process_tapping(keyrecord_t *keyp)
             }  else {
                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
                     debug("Tapping: End. last timeout tap release(>0).");
-                    keyp->tap_count = tapping_key.tap_count;
+                    keyp->tap = tapping_key.tap;
                     process_action(keyp);
                     tapping_key = (keyrecord_t){};
                     return true;
                 }
                 else if (is_tap_key(keyp->event.key) && event.pressed) {
-                    if (tapping_key.tap_count > 1) {
+                    if (tapping_key.tap.count > 1) {
                         debug("Tapping: Start new tap with releasing last timeout tap(>1).\n");
                         // unregister key
                         process_action(&(keyrecord_t){
-                                .tap_count = tapping_key.tap_count,
+                                .tap = tapping_key.tap,
                                 .event.key = tapping_key.event.key,
                                 .event.time = event.time,
                                 .event.pressed = false
@@ -653,10 +811,11 @@ static bool process_tapping(keyrecord_t *keyp)
         }
     } else if (IS_TAPPING_RELEASED()) {
         if (WITHIN_TAPPING_TERM(event)) {
-            if (tapping_key.tap_count > 0 && IS_TAPPING_KEY(event.key) && event.pressed) {
+            if (tapping_key.tap.count > 0 && IS_TAPPING_KEY(event.key) && event.pressed) {
                 // sequential tap.
-                keyp->tap_count = tapping_key.tap_count + 1;
-                debug("Tapping: Tap press("); debug_dec(keyp->tap_count); debug(")\n");
+                keyp->tap = tapping_key.tap;
+                keyp->tap.count += 1;
+                debug("Tapping: Tap press("); debug_dec(keyp->tap.count); debug(")\n");
                 process_action(keyp);
                 tapping_key = *keyp;
                 debug_tapping_key();
@@ -701,16 +860,16 @@ static bool process_tapping(keyrecord_t *keyp)
 static void waiting_buffer_scan_tap(void)
 {
     // tapping already is settled
-    if (tapping_key.tap_count > 0) return;
-    // invalid state: tapping_key released && tap_count == 0
+    if (tapping_key.tap.count > 0) return;
+    // invalid state: tapping_key released && tap.count == 0
     if (!tapping_key.event.pressed) return;
 
     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
         if (IS_TAPPING_KEY(waiting_buffer[i].event.key) &&
                 !waiting_buffer[i].event.pressed &&
                 WITHIN_TAPPING_TERM(waiting_buffer[i].event)) {
-            tapping_key.tap_count = 1;
-            waiting_buffer[i].tap_count = 1;
+            tapping_key.tap.count = 1;
+            waiting_buffer[i].tap.count = 1;
             process_action(&tapping_key);
 
             debug("waiting_buffer_scan_tap: found at ["); debug_dec(i); debug("]\n");
@@ -813,39 +972,24 @@ bool sending_anykey(void)
             host_last_sysytem_report() || host_last_consumer_report());
 }
 
-void layer_switch(uint8_t new_layer)
-{
-    if (current_layer != new_layer) {
-        debug("Layer Switch: "); debug_hex(current_layer);
-        debug(" -> "); debug_hex(new_layer); debug("\n");
-
-        current_layer = new_layer;
-        clear_keyboard_but_mods(); // To avoid stuck keys
-        // NOTE: update mods with full scan of matrix? if modifier changes between layers
-    }
-}
-
 bool is_tap_key(key_t key)
 {
-    action_t action = get_action(key);
+    action_t action = layer_switch_get_action(key);
 
     switch (action.kind.id) {
         case ACT_LMODS_TAP:
         case ACT_RMODS_TAP:
             return true;
-        case ACT_LAYER:
-        case ACT_LAYER_BIT:
+        case ACT_KEYMAP:
+        case ACT_OVERLAY:
             switch (action.layer.code) {
-                case LAYER_MOMENTARY:
-                case LAYER_ON_PRESS:
-                case LAYER_ON_RELEASE:
-                case LAYER_DEFAULT:
-                    return false;
-                case LAYER_TAP_TOGGLE:
-                default:    /* tap key */
+                case 0x04 ... 0xEF:    /* tap key */
+                case OP_INV:
                     return true;
+                default:
+                    return false;
             }
-            return false;
+        case ACT_MACRO:
         case ACT_FUNCTION:
             if (action.func.opt & FUNC_TAP) { return true; }
             return false;
@@ -865,7 +1009,8 @@ static void debug_event(keyevent_t event)
 }
 static void debug_record(keyrecord_t record)
 {
-    debug_event(record.event); debug(":"); debug_dec(record.tap_count);
+    debug_event(record.event); debug(":"); debug_dec(record.tap.count);
+    if (record.tap.interrupted) debug("-");
 }
 static void debug_action(action_t action)
 {
@@ -876,8 +1021,8 @@ static void debug_action(action_t action)
         case ACT_RMODS_TAP:         debug("ACT_RMODS_TAP");         break;
         case ACT_USAGE:             debug("ACT_USAGE");             break;
         case ACT_MOUSEKEY:          debug("ACT_MOUSEKEY");          break;
-        case ACT_LAYER:             debug("ACT_LAYER");     break;
-        case ACT_LAYER_BIT:         debug("ACT_LAYER_BIT");         break;
+        case ACT_KEYMAP:            debug("ACT_KEYMAP");            break;
+        case ACT_OVERLAY:           debug("ACT_OVERLAY");           break;
         case ACT_MACRO:             debug("ACT_MACRO");             break;
         case ACT_COMMAND:           debug("ACT_COMMAND");           break;
         case ACT_FUNCTION:          debug("ACT_FUNCTION");          break;
diff --git a/common/action.h b/common/action.h
index b9a6cb5b40..ead917983c 100644
--- a/common/action.h
+++ b/common/action.h
@@ -19,12 +19,23 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "keyboard.h"
 #include "keycode.h"
+#include "action_macro.h"
 
 
 /* Struct to record event and tap count  */
+typedef union {
+    struct {
+        bool    interrupted :1;
+        bool    reserved2   :1;
+        bool    reserved1   :1;
+        bool    reserved0   :1;
+        uint8_t count       :4;
+    };
+} tap_t;
+
 typedef struct {
     keyevent_t  event;
-    uint8_t     tap_count;
+    tap_t tap;
 } keyrecord_t;
 
 /* Action struct.
@@ -76,17 +87,15 @@ typedef union {
 
 
 
-/* layer used currently */
-extern uint8_t current_layer;
-/* layer to return or start with */
-extern uint8_t default_layer;
-
 /* Execute action per keyevent */
 void action_exec(keyevent_t event);
 
 /* action for key */
 action_t action_for_key(uint8_t layer, key_t key);
 
+/* macro */
+const prog_macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt);
+
 /* user defined special function */
 void action_function(keyrecord_t *record, uint8_t id, uint8_t opt);
 
@@ -112,8 +121,8 @@ bool waiting_buffer_has_anykey_pressed(void);
  * ============
  * 16bit code: action_kind(4bit) + action_parameter(12bit)
  *
- * Keyboard Keys
- * -------------
+ * Keyboard Keys(00XX)
+ * -------------------
  * ACT_LMODS(0000):
  * 0000|0000|000000|00    No action
  * 0000|0000|000000|01    Transparent
@@ -143,8 +152,8 @@ bool waiting_buffer_has_anykey_pressed(void);
  * 0011|mods| keycode     Right mods + tap Key
  *
  *
- * Other HID Usage
- * ---------------
+ * Other keys(01XX)
+ * --------------------
  * This action handles other usages than keyboard.
  * ACT_USAGE(0100):
  * 0100|00| usage(10)     System control(0x80) - General Desktop page(0x01)
@@ -152,41 +161,45 @@ bool waiting_buffer_has_anykey_pressed(void);
  * 0100|10| usage(10)     (reserved)
  * 0100|11| usage(10)     (reserved)
  *
- *
- * Mouse Keys
- * ----------
- * TODO: can be combined with 'Other HID Usage'? to save action kind id.
  * ACT_MOUSEKEY(0110):
  * 0101|XXXX| keycode     Mouse key
  *
  *
- * Layer Actions
- * -------------
- * ACT_LAYER(1000):            Set layer
- * ACT_LAYER_BIT(1001):        Bit-op layer
- *
- * 1000|LLLL|0000 0000   set L to layer on press and set default on release(momentary)
- * 1000|LLLL|0000 0001   set L to layer on press
- * 1000|LLLL|0000 0010   set L to layer on release
- * 1000|----|0000 0011   set default to layer on both(return to default layer)
- * 1000|LLLL| keycode    set L to layer while hold and send key on tap
- * 1000|LLLL|1111 0000   set L to layer while hold and toggle on several taps
- * 1000|LLLL|1111 1111   set L to default and layer(on press)
- *
- * 1001|BBBB|0000 0000   (not used)
- * 1001|BBBB|0000 0001   bit-xor layer with B on press
- * 1001|BBBB|0000 0010   bit-xor layer with B on release
- * 1001|BBBB|0000 0011   bit-xor layer with B on both(momentary)
- * 1001|BBBB| keycode    bit-xor layer with B while hold and send key on tap
- * 1001|BBBB|1111 0000   bit-xor layer with B while hold and toggle on several taps
- * 1001|BBBB|1111 1111   bit-xor default with B and set layer(on press)
+ * Layer Actions(10XX)
+ * -------------------
+ * ACT_KEYMAP:
+ * 1000|--xx|0000 0000   Clear keyamp and overlay
+ * 1000|LLLL|0000 00xx   Reset default layer and clear keymap and overlay
+ * 1000|LLLL| keycode    Invert with tap key
+ * 1000|LLLL|1111 0000   Invert with tap toggle
+ * 1000|LLLL|1111 00xx   Invert[^=  1<<L]
+ * 1000|LLLL|1111 0100   On/Off
+ * 1000|LLLL|1111 01xx   On[|= 1<<L]
+ * 1000|LLLL|1111 1000   Off/On
+ * 1000|LLLL|1111 10xx   Off[&= ~(1<<L)]
+ * 1000|LLLL|1111 1100   Set/Clear
+ * 1000|LLLL|1111 11xx   Set[= 1<<L]
+ * default layer: 0-15(4bit)
+ * xx: On {00:for special use, 01:press, 10:release, 11:both}
  *
+ * ACT_OVERLAY:
+ * 1011|0000|0000 0000   Clear overlay
+ * 1011|LLLL|0000 00ss   Invert 4-bit chunk [^= L<<(4*ss)]
+ * 1011|LLLL| keycode    Invert with tap key
+ * 1011|LLLL|1111 0000   Invert with tap toggle
+ * 1011|LLLL|1111 00xx   Invert[^= 1<<L]
+ * 1011|LLLL|1111 0100   On/Off(momentary)
+ * 1011|LLLL|1111 01xx   On[|= 1<<L]
+ * 1011|LLLL|1111 1000   Off/On
+ * 1011|LLLL|1111 10xx   Off[&= ~(1<<L)]
+ * 1011|LLLL|1111 1100   Set/Clear
+ * 1011|LLLL|1111 11xx   Set[= 1<<L]
+ * overlays: 16-layer on/off status(16bit)
+ * xx: On {00:for special use, 01:press, 10:release, 11:both}
  *
  *
  * Extensions(11XX)
  * ----------------
- * NOTE: NOT FIXED
- *
  * ACT_MACRO(1100):
  * 1100|opt | id(8)      Macro play?
  * 1100|1111| id(8)      Macro record?
@@ -208,8 +221,8 @@ enum action_kind_id {
     ACT_USAGE           = 0b0100,
     ACT_MOUSEKEY        = 0b0101,
 
-    ACT_LAYER           = 0b1000,
-    ACT_LAYER_BIT       = 0b1001,
+    ACT_KEYMAP          = 0b1000,
+    ACT_OVERLAY         = 0b1001,
 
     ACT_MACRO           = 0b1100,
     ACT_COMMAND         = 0b1110,
@@ -223,20 +236,20 @@ enum action_kind_id {
 #define ACTION(kind, param)             ((kind)<<12 | (param))
 #define MODS4(mods)                     (((mods)>>4 | (mods)) & 0x0F)
 
-/* Key */
+/*
+ * Key
+ */
 #define ACTION_KEY(key)                 ACTION(ACT_LMODS,    key)
 /* Mods & key */
 #define ACTION_LMODS(mods)              ACTION(ACT_LMODS,    MODS4(mods)<<8 | 0x00)
 #define ACTION_LMODS_KEY(mods, key)     ACTION(ACT_LMODS,    MODS4(mods)<<8 | (key))
 #define ACTION_RMODS(mods)              ACTION(ACT_RMODS,    MODS4(mods)<<8 | 0x00)
 #define ACTION_RMODS_KEY(mods, key)     ACTION(ACT_RMODS,    MODS4(mods)<<8 | (key))
-/* Mod & key */
 #define ACTION_LMOD(mod)                ACTION(ACT_LMODS,    MODS4(MOD_BIT(mod))<<8 | 0x00)
 #define ACTION_LMOD_KEY(mod, key)       ACTION(ACT_LMODS,    MODS4(MOD_BIT(mod))<<8 | (key))
 #define ACTION_RMOD(mod)                ACTION(ACT_RMODS,    MODS4(MOD_BIT(mod))<<8 | 0x00)
 #define ACTION_RMOD_KEY(mod, key)       ACTION(ACT_RMODS,    MODS4(MOD_BIT(mod))<<8 | (key))
-
-/* Mods + Tap key */
+/* Tap key */
 enum mods_codes {
     MODS_ONESHOT           = 0x00,
 };
@@ -244,102 +257,112 @@ enum mods_codes {
 #define ACTION_LMODS_ONESHOT(mods)      ACTION(ACT_LMODS_TAP, MODS4(mods)<<8 | MODS_ONESHOT)
 #define ACTION_RMODS_TAP_KEY(mods, key) ACTION(ACT_RMODS_TAP, MODS4(mods)<<8 | (key))
 #define ACTION_RMODS_ONESHOT(mods)      ACTION(ACT_RMODS_TAP, MODS4(mods)<<8 | MODS_ONESHOT)
-/* Mod + Tap key */
 #define ACTION_LMOD_TAP_KEY(mod, key)   ACTION(ACT_LMODS_TAP, MODS4(MOD_BIT(mod))<<8 | (key))
 #define ACTION_LMOD_ONESHOT(mod)        ACTION(ACT_LMODS_TAP, MODS4(MOD_BIT(mod))<<8 | MODS_ONESHOT)
 #define ACTION_RMOD_TAP_KEY(mod, key)   ACTION(ACT_RMODS_TAP, MODS4(MOD_BIT(mod))<<8 | (key))
 #define ACTION_RMOD_ONESHOT(mod)        ACTION(ACT_RMODS_TAP, MODS4(MOD_BIT(mod))<<8 | MODS_ONESHOT)
 
+/* HID Usage */
+enum usage_pages {
+    PAGE_SYSTEM,
+    PAGE_CONSUMER
+};
+#define ACTION_USAGE_SYSTEM(id)         ACTION(ACT_USAGE, PAGE_SYSTEM<<10 | (id))
+#define ACTION_USAGE_CONSUMER(id)       ACTION(ACT_USAGE, PAGE_CONSUMER<<10 | (id))
 
-/*
- * Switch layer
+/* Mousekey */
+#define ACTION_MOUSEKEY(key)            ACTION(ACT_MOUSEKEY, key)
+
+
+
+/* Layer Actions:
+ *      Invert  layer ^= (1<<layer)
+ *      On      layer |= (1<<layer)
+ *      Off     layer &= ~(1<<layer)
+ *      Set     layer = (1<<layer)
+ *      Clear   layer = 0
  */
-enum layer_codes {
-    LAYER_MOMENTARY = 0,
-    LAYER_ON_PRESS = 1,
-    LAYER_ON_RELEASE = 2,
-    LAYER_DEFAULT =3,
-    LAYER_TAP_TOGGLE = 0xF0,
-    LAYER_CHANGE_DEFAULT = 0xFF
-};
-enum layer_vals_default {
-    DEFAULT_ON_PRESS = 1,
-    DEFAULT_ON_RELEASE = 2,
-    DEFAULT_ON_BOTH = 3,
+enum layer_params {
+    ON_PRESS    = 1,
+    ON_RELEASE  = 2,
+    ON_BOTH     = 3,
+
+    OP_RESET  = 0x00,
+    OP_INV4  = 0x00,
+    OP_INV   = 0xF0,
+    OP_ON    = 0xF4,
+    OP_OFF   = 0xF8,
+    OP_SET   = 0xFC,
 };
 
-/*
- * return to default layer
+/* 
+ * Default Layer
  */
-#define ACTION_LAYER_DEFAULT                    ACTION_LAYER_DEFAULT_R
-/* set default layer on press */
-#define ACTION_LAYER_DEFAULT_P                  ACTION(ACT_LAYER, DEFAULT_ON_PRESS<<8 | LAYER_DEFAULT)
-/* set default layer on release */
-#define ACTION_LAYER_DEFAULT_R                  ACTION(ACT_LAYER, DEFAULT_ON_RELEASE<<8 | LAYER_DEFAULT)
-/* change default layer and set layer */
-
+#define ACTION_DEFAULT_LAYER                     ACTION(ACT_KEYMAP, ON_RELEASE<<8 | OP_RESET | 0)
+#define ACTION_DEFAULT_LAYER_SET(layer)          ACTION_DEFAULT_LAYER_TO(layer, ON_RELEASE)
+#define ACTION_DEFAULT_LAYER_TO(layer, on)       ACTION(ACT_KEYMAP, (layer)<<8 | OP_RESET | (on))
 /*
- * Set layer
+ * Keymap Layer
  */
-/* set layer on press and none on release */
-#define ACTION_LAYER_SET(layer)                 ACTION_LAYER_SET_P(layer)
-/* set layer on press and set default on release (This is needed by legacy keymap support.) */
-#define ACTION_LAYER_SET_MOMENTARY(layer)       ACTION(ACT_LAYER, (layer)<<8 | LAYER_MOMENTARY)
-/* set layer on press and none on release */
-#define ACTION_LAYER_SET_TOGGLE(layer)          ACTION_LAYER_SET_R(layer)
-/* set layer while hold and send key on tap */
-#define ACTION_LAYER_SET_TAP_KEY(layer, key)    ACTION(ACT_LAYER, (layer)<<8 | (key))
-/* set layer on press */
-#define ACTION_LAYER_SET_P(layer)               ACTION(ACT_LAYER, (layer)<<8 | LAYER_ON_PRESS)
-/* set layer on release */
-#define ACTION_LAYER_SET_R(layer)               ACTION(ACT_LAYER, (layer)<<8 | LAYER_ON_RELEASE)
-/* set layer on hold and toggle on several taps */
-#define ACTION_LAYER_SET_TAP_TOGGLE(layer)      ACTION(ACT_LAYER, (layer)<<8 | LAYER_TAP_TOGGLE)
-/* set default layer on both press and release */
-#define ACTION_LAYER_SET_DEFAULT(layer)         ACTION(ACT_LAYER, (layer)<<8 | LAYER_CHANGE_DEFAULT)
+#define ACTION_KEYMAP_MOMENTARY(layer)           ACTION_KEYMAP_ON_OFF(layer)
+#define ACTION_KEYMAP_TOGGLE(layer)              ACTION_KEYMAP_INV(layer, ON_RELEASE)
+/* Keymap Invert */
+#define ACTION_KEYMAP_INV(layer, on)             ACTION(ACT_KEYMAP, (layer)<<8 | OP_INV | (on))
+#define ACTION_KEYMAP_TAP_TOGGLE(layer)          ACTION(ACT_KEYMAP, (layer)<<8 | OP_INV | 0)
+/* Keymap On */
+#define ACTION_KEYMAP_ON(layer, on)              ACTION(ACT_KEYMAP, (layer)<<8 | OP_ON  | (on))
+#define ACTION_KEYMAP_ON_OFF(layer)              ACTION(ACT_KEYMAP, (layer)<<8 | OP_ON  | 0)
+/* Keymap Off */
+#define ACTION_KEYMAP_OFF(layer, on)             ACTION(ACT_KEYMAP, (layer)<<8 | OP_OFF | (on))
+#define ACTION_KEYMAP_OFF_ON(layer)              ACTION(ACT_KEYMAP, (layer)<<8 | OP_OFF | 0)
+/* Keymap Set */
+#define ACTION_KEYMAP_SET(layer, on)             ACTION(ACT_KEYMAP, (layer)<<8 | OP_SET | (on))
+#define ACTION_KEYMAP_SET_CLEAR(layer)           ACTION(ACT_KEYMAP, (layer)<<8 | OP_SET | 0)
+/* Keymap Invert with tap key */
+#define ACTION_KEYMAP_TAP_KEY(layer, key)        ACTION(ACT_KEYMAP, (layer)<<8 | (key))
 
 /*
- * Bit-op layer
+ * Overlay Layer
  */
-/* bit-xor on both press and release */
-#define ACTION_LAYER_BIT(bits)                  ACTION_LAYER_BIT_MOMENTARY(bits)
-#define ACTION_LAYER_BIT_MOMENTARY(bits)        ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_MOMENTARY)
-/* bit-xor on press */
-#define ACTION_LAYER_BIT_TOGGLE(bits)           ACTION_LAYER_BIT_R(bits)
-/* bit-xor while hold and send key on tap */
-#define ACTION_LAYER_BIT_TAP_KEY(bits, key)     ACTION(ACT_LAYER_BIT, (bits)<<8 | (key))
-/* bit-xor on press */
-#define ACTION_LAYER_BIT_P(bits)                ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_ON_PRESS)
-/* bit-xor on release */
-#define ACTION_LAYER_BIT_R(bits)                ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_ON_RELEASE)
-/* bit-xor while hold and toggle on several taps */
-#define ACTION_LAYER_BIT_TAP_TOGGLE(bits)       ACTION(ACT_LAYER_BIT, (bits)<<8 | LAYER_TAP_TOGGLE)
-/* bit-xor default layer and set layer */
-#define ACTION_LAYER_BIT_DEFAULT(bits)          ACTION(ACT_LAYER, (bits)<<8 | LAYER_CHANGE_DEFAULT)
-
-
-/* HID Usage */
-enum usage_pages {
-    PAGE_SYSTEM,
-    PAGE_CONSUMER
-};
-#define ACTION_USAGE_SYSTEM(id)         ACTION(ACT_USAGE, PAGE_SYSTEM<<10 | (id))
-#define ACTION_USAGE_CONSUMER(id)       ACTION(ACT_USAGE, PAGE_CONSUMER<<10 | (id))
+#define ACTION_OVERLAY_MOMENTARY(layer)           ACTION_OVERLAY_ON_OFF(layer)
+#define ACTION_OVERLAY_TOGGLE(layer)              ACTION_OVERLAY_INV(layer, ON_RELEASE)
+/* Overlay Clear */
+#define ACTION_OVERLAY_CLEAR(on)                  ACTION(ACT_OVERLAY, 0<<8 | OP_INV4 | (on))
+/* Overlay Invert 4-bit chunk */
+#define ACTION_OVERLAY_INV4(bits, shift)          ACTION(ACT_OVERLAY, (bits)<<8 | OP_INV4 | shift)
+/* Overlay Invert */
+#define ACTION_OVERLAY_INV(layer, on)             ACTION(ACT_OVERLAY, (layer)<<8 | OP_INV | (on))
+#define ACTION_OVERLAY_TAP_TOGGLE(layer)          ACTION(ACT_OVERLAY, (layer)<<8 | OP_INV | 0)
+/* Overlay On */
+#define ACTION_OVERLAY_ON(layer, on)              ACTION(ACT_OVERLAY, (layer)<<8 | OP_ON  | (on))
+#define ACTION_OVERLAY_ON_OFF(layer)              ACTION(ACT_OVERLAY, (layer)<<8 | OP_ON  | 0)
+/* Overlay Off */
+#define ACTION_OVERLAY_OFF(layer, on)             ACTION(ACT_OVERLAY, (layer)<<8 | OP_OFF | (on))
+#define ACTION_OVERLAY_OFF_ON(layer)              ACTION(ACT_OVERLAY, (layer)<<8 | OP_OFF | 0)
+/* Overlay Set */
+#define ACTION_OVERLAY_SET(layer, on)             ACTION(ACT_OVERLAY, (layer)<<8 | OP_SET | (on))
+#define ACTION_OVERLAY_SET_CLEAR(layer)           ACTION(ACT_OVERLAY, (layer)<<8 | OP_SET | 0)
+/* Overlay Invert with tap key */
+#define ACTION_OVERLAY_TAP_KEY(layer, key)        ACTION(ACT_OVERLAY, (layer)<<8 | (key))
 
-/* Mousekey */
-#define ACTION_MOUSEKEY(key)            ACTION(ACT_MOUSEKEY, key)
 
+/*
+ * Extensions
+ */
 /* Macro */
-#define ACTION_MACRO(opt, id)           ACTION(ACT_FUNCTION, (opt)<<8 | (addr))
+#define ACTION_MACRO(id)                ACTION(ACT_MACRO, (id))
+#define ACTION_MACRO_TAP(id)            ACTION(ACT_MACRO, FUNC_TAP<<8 | (id))
+#define ACTION_MACRO_OPT(id, opt)       ACTION(ACT_MACRO, (opt)<<8 | (id))
 
 /* Command */
-#define ACTION_COMMAND(opt, id)         ACTION(ACT_COMMAND,  (opt)<<8 | (addr))
+#define ACTION_COMMAND(id, opt)         ACTION(ACT_COMMAND,  (opt)<<8 | (addr))
 
 /* Function */
 enum function_opts {
     FUNC_TAP        = 0x8,      /* indciates function is tappable */
 };
-#define ACTION_FUNCTION(id, opt)        ACTION(ACT_FUNCTION, (opt)<<8 | id)
-#define ACTION_FUNCTION_TAP(id)         ACTION(ACT_FUNCTION, FUNC_TAP<<8 | id)
+#define ACTION_FUNCTION(id)             ACTION(ACT_FUNCTION, (id))
+#define ACTION_FUNCTION_TAP(id)         ACTION(ACT_FUNCTION, FUNC_TAP<<8 | (id))
+#define ACTION_FUNCTION_OPT(id, opt)    ACTION(ACT_FUNCTION, (opt)<<8 | (id))
 
 #endif  /* ACTION_H */
diff --git a/common/action_macro.c b/common/action_macro.c
index 72859c0dda..ca7ffa822d 100644
--- a/common/action_macro.c
+++ b/common/action_macro.c
@@ -41,7 +41,6 @@ void action_macro_play(const prog_macro_t *macro_p)
             case MODS_DOWN:
                 MACRO_READ();
                 debug("MODS_DOWN("); debug_hex(macro); debug(")\n");
-                debug("MODS_UP("); debug_hex(macro); debug(")\n");
                 add_mods(macro);
                 break;
             case MODS_UP:
diff --git a/common/action_macro.h b/common/action_macro.h
index 3833c7c8ae..db65779590 100644
--- a/common/action_macro.h
+++ b/common/action_macro.h
@@ -20,6 +20,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <avr/pgmspace.h>
 
 
+#define MACRO_NONE  0
+#define MACRO(...) ({ static prog_macro_t _m[] PROGMEM = { __VA_ARGS__ }; _m; })
+
+
 typedef uint8_t macro_t;
 typedef macro_t prog_macro_t PROGMEM;
 
diff --git a/common/command.c b/common/command.c
index 7bb2a23f19..202d531fd8 100644
--- a/common/command.c
+++ b/common/command.c
@@ -26,7 +26,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "timer.h"
 #include "keyboard.h"
 #include "bootloader.h"
+#include "layer_switch.h"
 #include "command.h"
+
 #ifdef MOUSEKEY_ENABLE
 #include "mousekey.h"
 #endif
@@ -53,7 +55,7 @@ static void mousekey_console_help(void);
 #endif
 
 static uint8_t numkey2num(uint8_t code);
-static void switch_layer(uint8_t layer);
+static void switch_default_layer(uint8_t layer);
 
 
 typedef enum { ONESHOT, CONSOLE, MOUSEKEY } cmdstate_t;
@@ -261,18 +263,16 @@ static bool command_common(uint8_t code)
 #endif
             break;
 #endif
+        case KC_ESC:
+        case KC_GRV:
         case KC_0:
-        case KC_F10:
-            clear_keyboard();
-            switch_layer(0);
+            switch_default_layer(0);
             break;
         case KC_1 ... KC_9:
-            clear_keyboard();
-            switch_layer((code - KC_1) + 1);
+            switch_default_layer((code - KC_1) + 1);
             break;
-        case KC_F1 ... KC_F9:
-            clear_keyboard();
-            switch_layer((code - KC_F1) + 1);
+        case KC_F1 ... KC_F12:
+            switch_default_layer((code - KC_F1) + 1);
             break;
         default:
             print("?");
@@ -541,11 +541,10 @@ static uint8_t numkey2num(uint8_t code)
     return 0;
 }
 
-static void switch_layer(uint8_t layer)
+static void switch_default_layer(uint8_t layer)
 {
-    print_val_hex8(current_layer);
-    print_val_hex8(default_layer);
-    current_layer = layer;
-    default_layer = layer;
-    print("switch to "); print_val_hex8(layer);
+    print("switch_default_layer: "); print_dec(default_layer); print(" to "); print_dec(layer); print("\n");
+    default_layer_set(layer);
+    overlay_clear();
+    clear_keyboard();
 }
diff --git a/common/keymap.c b/common/keymap.c
index 078615814e..aa8d944a79 100644
--- a/common/keymap.c
+++ b/common/keymap.c
@@ -14,13 +14,71 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+#include <avr/pgmspace.h>
 #include "keymap.h"
 #include "report.h"
 #include "keycode.h"
+#include "layer_switch.h"
 #include "action.h"
+#include "action_macro.h"
+#include "debug.h"
 
 
-action_t keymap_keycode_to_action(uint8_t keycode)
+static action_t keycode_to_action(uint8_t keycode);
+
+#ifdef USE_KEYMAP_V2
+/* converts key to action */
+action_t action_for_key(uint8_t layer, key_t key)
+{
+    uint8_t keycode = keymap_key_to_keycode(layer, key);
+    switch (keycode) {
+        case KC_FN0 ... KC_FN31:
+            return keymap_fn_to_action(keycode);
+        default:
+            return keycode_to_action(keycode);
+    }
+}
+#else
+/* 
+ * legacy keymap support
+ */
+/* translation for legacy keymap */
+action_t action_for_key(uint8_t layer, key_t key)
+{
+    /* convert from legacy keycode to action */
+    /* layer 16-31 indicate 'overlay' but not supported in legacy keymap */
+    uint8_t keycode = keymap_get_keycode((layer & OVERLAY_MASK), key.row, key.col);
+    action_t action;
+    switch (keycode) {
+        case KC_FN0 ... KC_FN31:
+            {
+                uint8_t layer = keymap_fn_layer(FN_INDEX(keycode));
+                uint8_t key = keymap_fn_keycode(FN_INDEX(keycode));
+                if (key) {
+                    action.code = ACTION_KEYMAP_TAP_KEY(layer, key);
+                } else {
+                    action.code = ACTION_KEYMAP_MOMENTARY(layer);
+                }
+            }
+            return action;
+        default:
+            return keycode_to_action(keycode);
+    }
+}
+#endif
+
+
+__attribute__ ((weak))
+const prog_macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt) { return MACRO_NONE; }
+
+__attribute__ ((weak))
+void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) {}
+
+
+
+
+/* translates keycode to action */
+static action_t keycode_to_action(uint8_t keycode)
 {
     action_t action;
     switch (keycode) {
@@ -51,34 +109,3 @@ action_t keymap_keycode_to_action(uint8_t keycode)
     }
     return action;
 }
-
-#ifndef NO_LEGACY_KEYMAP_SUPPORT
-/* legacy support with weak reference */
-__attribute__ ((weak))
-action_t action_for_key(uint8_t layer, key_t key)
-{
-    /* convert from legacy keycode to action */
-    uint8_t keycode = keymap_get_keycode(layer, key.row, key.col);
-    action_t action;
-    switch (keycode) {
-        case KC_FN0 ... KC_FN31:
-            {
-                uint8_t layer = keymap_fn_layer(FN_INDEX(keycode));
-                uint8_t key = keymap_fn_keycode(FN_INDEX(keycode));
-                if (key) {
-                    action.code = ACTION_LAYER_SET_TAP_KEY(layer, key);
-                } else {
-                    action.code = ACTION_LAYER_SET_MOMENTARY(layer);
-                }
-            }
-            return action;
-        default:
-            return keymap_keycode_to_action(keycode);
-    }
-}
-#endif
-
-__attribute__ ((weak))
-void action_function(keyrecord_t *event, uint8_t id, uint8_t opt)
-{
-}
diff --git a/common/keymap.h b/common/keymap.h
index 63bf14482b..0c483483fb 100644
--- a/common/keymap.h
+++ b/common/keymap.h
@@ -23,16 +23,19 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "action.h"
 
 
-/* translates key_t to keycode */
+#ifdef USE_KEYMAP_V2
+/* translates key to keycode
+ *      layer:  0-15 for base layers
+ *              16-31 for overlays
+ */
 uint8_t keymap_key_to_keycode(uint8_t layer, key_t key);
-/* translates keycode to action */
-action_t keymap_keycode_to_action(uint8_t keycode);
 /* translates Fn keycode to action */
 action_t keymap_fn_to_action(uint8_t keycode);
-
-
-
-#ifndef NO_LEGACY_KEYMAP_SUPPORT
+#else
+#warning "You are using LEGACY KEYAMP. Consider using NEW KEYMAP."
+/* 
+ * legacy keymap support
+ */
 /* keycode of key */
 uint8_t keymap_get_keycode(uint8_t layer, uint8_t row, uint8_t col);
 /* layer to move during press Fn key */
diff --git a/common/layer_switch.c b/common/layer_switch.c
new file mode 100644
index 0000000000..19e286f885
--- /dev/null
+++ b/common/layer_switch.c
@@ -0,0 +1,201 @@
+#include <stdint.h>
+#include "keyboard.h"
+#include "action.h"
+#include "debug.h"
+#include "util.h"
+#include "layer_switch.h"
+
+
+/* 
+ * Default Layer (0-15)
+ */
+uint8_t default_layer = 0;
+
+void default_layer_set(uint8_t layer)
+{
+    debug("default_layer_set: ");
+    debug_dec(default_layer); debug(" to ");
+
+    default_layer = layer;
+
+    debug_dec(default_layer); debug("\n");
+
+    clear_keyboard_but_mods(); // To avoid stuck keys
+}
+
+
+/* 
+ * Keymap Layer (0-15)
+ */
+uint16_t keymap_stat = 0;
+
+/* return highest layer whose state is on */
+uint8_t keymap_get_layer(void)
+{
+    return biton16(keymap_stat);
+}
+
+static void keymap_stat_set(uint16_t stat)
+{
+    debug("keymap: ");
+    keymap_debug(); debug(" to ");
+
+    keymap_stat = stat;
+
+    keymap_debug(); debug("\n");
+
+    clear_keyboard_but_mods(); // To avoid stuck keys
+}
+
+void keymap_clear(void)
+{
+    keymap_stat_set(0);
+}
+
+
+void keymap_set(uint16_t stat)
+{
+    keymap_stat_set(stat);
+}
+
+void keymap_move(uint8_t layer)
+{
+    keymap_stat_set(1<<layer);
+}
+
+void keymap_on(uint8_t layer)
+{
+    keymap_stat_set(keymap_stat | (1<<layer));
+}
+
+void keymap_off(uint8_t layer)
+{
+    keymap_stat_set(keymap_stat & ~(1<<layer));
+}
+
+void keymap_invert(uint8_t layer)
+{
+    keymap_stat_set(keymap_stat ^ (1<<layer));
+}
+
+void keymap_or(uint16_t stat)
+{
+    keymap_stat_set(keymap_stat | stat);
+}
+void keymap_and(uint16_t stat)
+{
+    keymap_stat_set(keymap_stat & stat);
+}
+void keymap_xor(uint16_t stat)
+{
+    keymap_stat_set(keymap_stat ^ stat);
+}
+
+void keymap_debug(void)
+{
+    debug_hex16(keymap_stat); debug("("); debug_dec(keymap_get_layer()); debug(")");
+}
+
+
+
+/* 
+ * Overlay Layer (16-31 = 0-15|0x10)
+ */
+uint16_t overlay_stat = 0;
+
+/* return highest layer whose state is on */
+uint8_t overlay_get_layer(void)
+{
+    return biton16(overlay_stat);
+}
+
+static void overlay_stat_set(uint16_t stat)
+{
+    debug("overlay: ");
+    overlay_debug(); debug(" to ");
+
+    overlay_stat = stat;
+
+    overlay_debug(); debug("\n");
+
+    clear_keyboard_but_mods(); // To avoid stuck keys
+}
+
+void overlay_clear(void)
+{
+    overlay_stat_set(0);
+}
+
+
+void overlay_set(uint16_t stat)
+{
+    overlay_stat_set(stat);
+}
+
+void overlay_move(uint8_t layer)
+{
+    overlay_stat_set(1<<layer);
+}
+
+void overlay_on(uint8_t layer)
+{
+    overlay_stat_set(overlay_stat | (1<<layer));
+}
+
+void overlay_off(uint8_t layer)
+{
+    overlay_stat_set(overlay_stat & ~(1<<layer));
+}
+
+void overlay_invert(uint8_t layer)
+{
+    overlay_stat_set(overlay_stat ^ (1<<layer));
+}
+
+void overlay_or(uint16_t stat)
+{
+    overlay_stat_set(overlay_stat | stat);
+}
+void overlay_and(uint16_t stat)
+{
+    overlay_stat_set(overlay_stat & stat);
+}
+void overlay_xor(uint16_t stat)
+{
+    overlay_stat_set(overlay_stat ^ stat);
+}
+
+void overlay_debug(void)
+{
+    debug_hex16(overlay_stat); debug("("); debug_dec(overlay_get_layer()); debug(")");
+}
+
+action_t layer_switch_get_action(key_t key)
+{
+    action_t action;
+    action.code = ACTION_TRANSPARENT;
+
+    /* overlay: top layer first */
+    for (int8_t i = 15; i >= 0; i--) {
+        if (overlay_stat & (1<<i)) {
+            action = action_for_key(i | OVERLAY_BIT, key);
+            if (action.code != ACTION_TRANSPARENT) {
+                return action;
+            }
+        }
+    }
+
+    /* keymap: top layer first */
+    for (int8_t i = 15; i >= 0; i--) {
+        if (keymap_stat & (1<<i)) {
+            action = action_for_key(i, key);
+            if (action.code != ACTION_TRANSPARENT) {
+                return action;
+            }
+        }
+    }
+
+    /* default layer */
+    action = action_for_key(default_layer, key);
+    return action;
+}
diff --git a/common/layer_switch.h b/common/layer_switch.h
new file mode 100644
index 0000000000..a566ab12b7
--- /dev/null
+++ b/common/layer_switch.h
@@ -0,0 +1,80 @@
+/*
+Copyright 2013 Jun Wako <wakojun@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef LAYER_SWITCH_H
+#define LAYER_SWITCH_H
+
+#include <stdint.h>
+#include "keyboard.h"
+#include "action.h"
+
+
+/* overlays are asigned at layer 16-31 */
+#define OVERLAY_BIT      0x10
+#define OVERLAY_MASK     0x0F
+
+
+/*
+ * Default Layer
+ */
+/* base layer to fall back */
+extern uint8_t default_layer;
+void default_layer_set(uint8_t layer);
+
+
+/*
+ * Keymap Layer
+ */
+extern uint16_t keymap_stat;
+/* return current active layer */
+uint8_t keymap_get_layer(void);
+void keymap_clear(void);
+void keymap_set(uint16_t stat);
+void keymap_move(uint8_t layer);
+void keymap_on(uint8_t layer);
+void keymap_off(uint8_t layer);
+void keymap_invert(uint8_t layer);
+/* bitwise operation */
+void keymap_or(uint16_t stat);
+void keymap_and(uint16_t stat);
+void keymap_xor(uint16_t stat);
+void keymap_debug(void);
+
+
+/*
+ * Overlay Layer
+ */
+extern uint16_t overlay_stat;
+/* return current active layer */
+uint8_t overlay_get_layer(void);
+void overlay_clear(void);
+void overlay_set(uint16_t stat);
+void overlay_move(uint8_t layer);
+void overlay_on(uint8_t layer);
+void overlay_off(uint8_t layer);
+void overlay_invert(uint8_t layer);
+/* bitwise operation */
+void overlay_or(uint16_t stat);
+void overlay_and(uint16_t stat);
+void overlay_xor(uint16_t stat);
+void overlay_debug(void);
+
+
+
+/* return action depending on current layer status */
+action_t layer_switch_get_action(key_t key);
+
+#endif
diff --git a/common/util.c b/common/util.c
index 9d8fb93219..ff1926d7d1 100644
--- a/common/util.c
+++ b/common/util.c
@@ -39,6 +39,7 @@ uint8_t bitpop16(uint16_t bits)
 }
 
 // most significant on-bit - return highest location of on-bit
+// NOTE: return 0 when bit0 is on or all bits are off
 uint8_t biton(uint8_t bits)
 {
     uint8_t n = 0;
@@ -47,3 +48,13 @@ uint8_t biton(uint8_t bits)
     if (bits >> 1) { bits >>= 1; n += 1;}
     return n;
 }
+
+uint8_t biton16(uint16_t bits)
+{
+    uint8_t n = 0;
+    if (bits >> 8) { bits >>= 8; n += 8;}
+    if (bits >> 4) { bits >>= 4; n += 4;}
+    if (bits >> 2) { bits >>= 2; n += 2;}
+    if (bits >> 1) { bits >>= 1; n += 1;}
+    return n;
+}
diff --git a/common/util.h b/common/util.h
index c3734487f9..58b7fdf145 100644
--- a/common/util.h
+++ b/common/util.h
@@ -31,5 +31,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 uint8_t bitpop(uint8_t bits);
 uint8_t bitpop16(uint16_t bits);
 uint8_t biton(uint8_t bits);
+uint8_t biton16(uint16_t bits);
 
 #endif