Migrate to a state struct, for future proofness

To make it easier in the future to increase the amount of one-shot
layers available, use a union+struct combo, that allows scaling between
16 and 32 bits. This way we won't have to use all 32 bits, and can make
do with 24 only, still saving us almost a hundred bytes.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

src/Kaleidoscope/OneShot.cpp

@@ -26,9 +26,9 @@ namespace KaleidoscopePlugins {
   uint32_t OneShot::startTime = 0;
   uint16_t OneShot::timeOut = 2500;
   uint16_t OneShot::holdTimeOut = 250;
-  uint16_t OneShot::State = 0;
-  uint16_t OneShot::stickyState = 0;
-  uint16_t OneShot::pressedState = 0;
+  OneShot::state_t OneShot::State;
+  OneShot::state_t OneShot::stickyState;
+  OneShot::state_t OneShot::pressedState;
   uint32_t OneShot::leftMask;
   uint32_t OneShot::rightMask;
   Key OneShot::prevKey;
@@ -41,17 +41,17 @@ namespace KaleidoscopePlugins {
 #define isModifier(key) (key.raw >= Key_LCtrl.raw && key.raw <= Key_RGUI.raw)
 #define isLayerKey(key) (key.flags == (KEY_FLAGS | SYNTHETIC | SWITCH_TO_KEYMAP) && key.keyCode >= MOMENTARY_OFFSET && key.keyCode <= MOMENTARY_OFFSET + 23)
 
-#define isOneShot(idx) (bitRead (State, (idx)))
-#define setOneShot(idx) (bitWrite (State, idx, 1))
-#define clearOneShot(idx) (bitWrite (State, idx, 0))
+#define isOneShot(idx) (bitRead (State.all, (idx)))
+#define setOneShot(idx) (bitWrite (State.all, idx, 1))
+#define clearOneShot(idx) (bitWrite (State.all, idx, 0))
 
-#define isSticky(idx) (bitRead (stickyState, idx))
-#define setSticky(idx) (bitWrite (stickyState, idx, 1))
-#define clearSticky(idx) bitWrite (stickyState, idx, 0)
+#define isSticky(idx) (bitRead (stickyState.all, idx))
+#define setSticky(idx) (bitWrite (stickyState.all, idx, 1))
+#define clearSticky(idx) bitWrite (stickyState.all, idx, 0)
 
-#define setPressed(idx) bitWrite(pressedState, idx, 1)
-#define clearPressed(idx) bitWrite(pressedState, idx, 0)
-#define isPressed(idx) bitRead (pressedState, idx)
+#define setPressed(idx) bitWrite(pressedState.all, idx, 1)
+#define clearPressed(idx) bitWrite(pressedState.all, idx, 0)
+#define isPressed(idx) bitRead (pressedState.all, idx)
 
 #define isSameAsPrevious(key) (key.raw == prevKey.raw)
 #define saveAsPrevious(key) prevKey.raw = key.raw
@@ -128,7 +128,7 @@ namespace KaleidoscopePlugins {
     if (keyState & INJECTED)
       return mappedKey;
 
-    if (!State) {
+    if (!State.all) {
       if (!isOS (mappedKey)) {
         if (isMasked (row, col)) {
           if (key_toggled_off (keyState))
@@ -207,7 +207,7 @@ namespace KaleidoscopePlugins {
 
   void
   OneShot::loopHook (bool postClear) {
-    if (!State)
+    if (!State.all)
       return;
 
     if (postClear) {
@@ -252,7 +252,7 @@ namespace KaleidoscopePlugins {
 
   bool
   OneShot::isActive (void) {
-    return (State && !hasTimedOut ());
+    return (State.all && !hasTimedOut ());
   }
 
   bool

src/Kaleidoscope/OneShot.h

@@ -42,10 +42,17 @@ namespace KaleidoscopePlugins {
     void inject (Key key, uint8_t keyState);
 
   private:
+    typedef union {
+      struct {
+        uint8_t mods;
+        uint8_t layers;
+      };
+      uint16_t all;
+    } state_t;
     static uint32_t startTime;
-    static uint16_t State;
-    static uint16_t stickyState;
-    static uint16_t pressedState;
+    static state_t State;
+    static state_t stickyState;
+    static state_t pressedState;
     static uint32_t leftMask;
     static uint32_t rightMask;
     static Key prevKey;