1 files changed, 279 insertions, 0 deletions
diff --git a/quantum/action_layer.c b/quantum/action_layer.c
new file mode 100644
index 0000000000..ed1a4bd20d
--- /dev/null
+++ b/quantum/action_layer.c
@@ -0,0 +1,279 @@
+#include <stdint.h>
+#include "keyboard.h"
+#include "action.h"
+#include "util.h"
+#include "action_layer.h"
+
+#ifdef DEBUG_ACTION
+#    include "debug.h"
+#else
+#    include "nodebug.h"
+#endif
+
+/** \brief Default Layer State
+ */
+layer_state_t default_layer_state = 0;
+
+/** \brief Default Layer State Set At user Level
+ *
+ * Run user code on default layer state change
+ */
+__attribute__((weak)) layer_state_t default_layer_state_set_user(layer_state_t state) { return state; }
+
+/** \brief Default Layer State Set At Keyboard Level
+ *
+ *  Run keyboard code on default layer state change
+ */
+__attribute__((weak)) layer_state_t default_layer_state_set_kb(layer_state_t state) { return default_layer_state_set_user(state); }
+
+/** \brief Default Layer State Set
+ *
+ * Static function to set the default layer state, prints debug info and clears keys
+ */
+static void default_layer_state_set(layer_state_t state) {
+    state = default_layer_state_set_kb(state);
+    debug("default_layer_state: ");
+    default_layer_debug();
+    debug(" to ");
+    default_layer_state = state;
+    default_layer_debug();
+    debug("\n");
+#ifdef STRICT_LAYER_RELEASE
+    clear_keyboard_but_mods();  // To avoid stuck keys
+#else
+    clear_keyboard_but_mods_and_keys();  // Don't reset held keys
+#endif
+}
+
+/** \brief Default Layer Print
+ *
+ * Print out the hex value of the 32-bit default layer state, as well as the value of the highest bit.
+ */
+void default_layer_debug(void) { dprintf("%08lX(%u)", default_layer_state, get_highest_layer(default_layer_state)); }
+
+/** \brief Default Layer Set
+ *
+ * Sets the default layer state.
+ */
+void default_layer_set(layer_state_t state) { default_layer_state_set(state); }
+
+#ifndef NO_ACTION_LAYER
+/** \brief Default Layer Or
+ *
+ * Turns on the default layer based on matching bits between specifed layer and existing layer state
+ */
+void default_layer_or(layer_state_t state) { default_layer_state_set(default_layer_state | state); }
+/** \brief Default Layer And
+ *
+ * Turns on default layer based on matching enabled bits between specifed layer and existing layer state
+ */
+void default_layer_and(layer_state_t state) { default_layer_state_set(default_layer_state & state); }
+/** \brief Default Layer Xor
+ *
+ * Turns on default layer based on non-matching bits between specifed layer and existing layer state
+ */
+void default_layer_xor(layer_state_t state) { default_layer_state_set(default_layer_state ^ state); }
+#endif
+
+#ifndef NO_ACTION_LAYER
+/** \brief Keymap Layer State
+ */
+layer_state_t layer_state = 0;
+
+/** \brief Layer state set user
+ *
+ * Runs user code on layer state change
+ */
+__attribute__((weak)) layer_state_t layer_state_set_user(layer_state_t state) { return state; }
+
+/** \brief Layer state set keyboard
+ *
+ * Runs keyboard code on layer state change
+ */
+__attribute__((weak)) layer_state_t layer_state_set_kb(layer_state_t state) { return layer_state_set_user(state); }
+
+/** \brief Layer state set
+ *
+ * Sets the layer to match the specifed state (a bitmask)
+ */
+void layer_state_set(layer_state_t state) {
+    state = layer_state_set_kb(state);
+    dprint("layer_state: ");
+    layer_debug();
+    dprint(" to ");
+    layer_state = state;
+    layer_debug();
+    dprintln();
+#    ifdef STRICT_LAYER_RELEASE
+    clear_keyboard_but_mods();  // To avoid stuck keys
+#    else
+    clear_keyboard_but_mods_and_keys();  // Don't reset held keys
+#    endif
+}
+
+/** \brief Layer clear
+ *
+ * Turn off all layers
+ */
+void layer_clear(void) { layer_state_set(0); }
+
+/** \brief Layer state is
+ *
+ * Return whether the given state is on (it might still be shadowed by a higher state, though)
+ */
+bool layer_state_is(uint8_t layer) { return layer_state_cmp(layer_state, layer); }
+
+/** \brief Layer state compare
+ *
+ * Used for comparing layers {mostly used for unit testing}
+ */
+bool layer_state_cmp(layer_state_t cmp_layer_state, uint8_t layer) {
+    if (!cmp_layer_state) {
+        return layer == 0;
+    }
+    return (cmp_layer_state & ((layer_state_t)1 << layer)) != 0;
+}
+
+/** \brief Layer move
+ *
+ * Turns on the given layer and turn off all other layers
+ */
+void layer_move(uint8_t layer) { layer_state_set((layer_state_t)1 << layer); }
+
+/** \brief Layer on
+ *
+ * Turns on given layer
+ */
+void layer_on(uint8_t layer) { layer_state_set(layer_state | ((layer_state_t)1 << layer)); }
+
+/** \brief Layer off
+ *
+ * Turns off given layer
+ */
+void layer_off(uint8_t layer) { layer_state_set(layer_state & ~((layer_state_t)1 << layer)); }
+
+/** \brief Layer invert
+ *
+ * Toggle the given layer (set it if it's unset, or unset it if it's set)
+ */
+void layer_invert(uint8_t layer) { layer_state_set(layer_state ^ ((layer_state_t)1 << layer)); }
+
+/** \brief Layer or
+ *
+ * Turns on layers based on matching bits between specifed layer and existing layer state
+ */
+void layer_or(layer_state_t state) { layer_state_set(layer_state | state); }
+/** \brief Layer and
+ *
+ * Turns on layers based on matching enabled bits between specifed layer and existing layer state
+ */
+void layer_and(layer_state_t state) { layer_state_set(layer_state & state); }
+/** \brief Layer xor
+ *
+ * Turns on layers based on non-matching bits between specifed layer and existing layer state
+ */
+void layer_xor(layer_state_t state) { layer_state_set(layer_state ^ state); }
+
+/** \brief Layer debug printing
+ *
+ * Print out the hex value of the 32-bit layer state, as well as the value of the highest bit.
+ */
+void layer_debug(void) { dprintf("%08lX(%u)", layer_state, get_highest_layer(layer_state)); }
+#endif
+
+#if !defined(NO_ACTION_LAYER) && !defined(STRICT_LAYER_RELEASE)
+/** \brief source layer cache
+ */
+
+uint8_t source_layers_cache[(MATRIX_ROWS * MATRIX_COLS + 7) / 8][MAX_LAYER_BITS] = {{0}};
+
+/** \brief update source layers cache
+ *
+ * Updates the cached keys when changing layers
+ */
+void update_source_layers_cache(keypos_t key, uint8_t layer) {
+    const uint8_t key_number  = key.col + (key.row * MATRIX_COLS);
+    const uint8_t storage_row = key_number / 8;
+    const uint8_t storage_bit = key_number % 8;
+
+    for (uint8_t bit_number = 0; bit_number < MAX_LAYER_BITS; bit_number++) {
+        source_layers_cache[storage_row][bit_number] ^= (-((layer & (1U << bit_number)) != 0) ^ source_layers_cache[storage_row][bit_number]) & (1U << storage_bit);
+    }
+}
+
+/** \brief read source layers cache
+ *
+ * reads the cached keys stored when the layer was changed
+ */
+uint8_t read_source_layers_cache(keypos_t key) {
+    const uint8_t key_number  = key.col + (key.row * MATRIX_COLS);
+    const uint8_t storage_row = key_number / 8;
+    const uint8_t storage_bit = key_number % 8;
+    uint8_t       layer       = 0;
+
+    for (uint8_t bit_number = 0; bit_number < MAX_LAYER_BITS; bit_number++) {
+        layer |= ((source_layers_cache[storage_row][bit_number] & (1U << storage_bit)) != 0) << bit_number;
+    }
+
+    return layer;
+}
+#endif
+
+/** \brief Store or get action (FIXME: Needs better summary)
+ *
+ * Make sure the action triggered when the key is released is the same
+ * one as the one triggered on press. It's important for the mod keys
+ * when the layer is switched after the down event but before the up
+ * event as they may get stuck otherwise.
+ */
+action_t store_or_get_action(bool pressed, keypos_t key) {
+#if !defined(NO_ACTION_LAYER) && !defined(STRICT_LAYER_RELEASE)
+    if (disable_action_cache) {
+        return layer_switch_get_action(key);
+    }
+
+    uint8_t layer;
+
+    if (pressed) {
+        layer = layer_switch_get_layer(key);
+        update_source_layers_cache(key, layer);
+    } else {
+        layer = read_source_layers_cache(key);
+    }
+    return action_for_key(layer, key);
+#else
+    return layer_switch_get_action(key);
+#endif
+}
+
+/** \brief Layer switch get layer
+ *
+ * Gets the layer based on key info
+ */
+uint8_t layer_switch_get_layer(keypos_t key) {
+#ifndef NO_ACTION_LAYER
+    action_t action;
+    action.code = ACTION_TRANSPARENT;
+
+    layer_state_t layers = layer_state | default_layer_state;
+    /* check top layer first */
+    for (int8_t i = MAX_LAYER - 1; i >= 0; i--) {
+        if (layers & ((layer_state_t)1 << i)) {
+            action = action_for_key(i, key);
+            if (action.code != ACTION_TRANSPARENT) {
+                return i;
+            }
+        }
+    }
+    /* fall back to layer 0 */
+    return 0;
+#else
+    return get_highest_layer(default_layer_state);
+#endif
+}
+
+/** \brief Layer switch get layer
+ *
+ * Gets action code based on key position
+ */
+action_t layer_switch_get_action(keypos_t key) { return action_for_key(layer_switch_get_layer(key), key); }