input: add flip_x and flip_y for touchpad (#9481)

src/config/ConfigDescriptions.hpp

@@ -608,6 +608,18 @@ inline static const std::vector<SConfigOptionDescription> CONFIG_OPTIONS = {
         .type        = CONFIG_OPTION_BOOL,
         .data        = SConfigOptionDescription::SBoolData{false},
     },
+    SConfigOptionDescription{
+        .value       = "input:touchpad:flip_x",
+        .description = "Inverts the horizontal movement of the touchpad",
+        .type        = CONFIG_OPTION_BOOL,
+        .data        = SConfigOptionDescription::SBoolData{false},
+    },
+    SConfigOptionDescription{
+        .value       = "input:touchpad:flip_y",
+        .description = "Inverts the vertical movement of the touchpad",
+        .type        = CONFIG_OPTION_BOOL,
+        .data        = SConfigOptionDescription::SBoolData{false},
+    },
 
     /*
      * input:touchdevice:

src/config/ConfigManager.cpp

@@ -603,6 +603,8 @@ CConfigManager::CConfigManager() {
     registerConfigVar("input:touchpad:tap-and-drag", Hyprlang::INT{1});
     registerConfigVar("input:touchpad:drag_lock", Hyprlang::INT{0});
     registerConfigVar("input:touchpad:scroll_factor", {1.f});
+    registerConfigVar("input:touchpad:flip_x", Hyprlang::INT{0});
+    registerConfigVar("input:touchpad:flip_y", Hyprlang::INT{0});
     registerConfigVar("input:touchdevice:transform", Hyprlang::INT{0});
     registerConfigVar("input:touchdevice:output", {"[[Auto]]"});
     registerConfigVar("input:touchdevice:enabled", Hyprlang::INT{1});
@@ -731,6 +733,8 @@ CConfigManager::CConfigManager() {
     m_pConfig->addSpecialConfigValue("device", "relative_input", Hyprlang::INT{0});           // only for tablets
     m_pConfig->addSpecialConfigValue("device", "active_area_position", Hyprlang::VEC2{0, 0}); // only for tablets
     m_pConfig->addSpecialConfigValue("device", "active_area_size", Hyprlang::VEC2{0, 0});     // only for tablets
+    m_pConfig->addSpecialConfigValue("device", "flip_x", Hyprlang::INT{0});                   // only for touchpads
+    m_pConfig->addSpecialConfigValue("device", "flip_y", Hyprlang::INT{0});                   // only for touchpads
 
     // keywords
     m_pConfig->registerHandler(&::handleExec, "exec", {false});

src/devices/IPointer.hpp

@@ -17,9 +17,10 @@ class IPointer : public IHID {
     virtual SP<Aquamarine::IPointer> aq()        = 0;
 
     struct SMotionEvent {
-        uint32_t timeMs = 0;
-        Vector2D delta, unaccel;
-        bool     mouse = false;
+        uint32_t     timeMs = 0;
+        Vector2D     delta, unaccel;
+        bool         mouse = false;
+        SP<IPointer> device;
     };
 
     struct SMotionAbsoluteEvent {
@@ -109,6 +110,8 @@ class IPointer : public IHID {
 
     bool         connected   = false; // means connected to the cursor
     std::string  boundOutput = "";
+    bool         flipX       = false; // decide to invert horizontal movement
+    bool         flipY       = false; // decide to invert vertical movement
 
     WP<IPointer> self;
 };

src/devices/Mouse.cpp

@@ -27,6 +27,7 @@ CMouse::CMouse(SP<Aquamarine::IPointer> mouse_) : mouse(mouse_) {
             .delta   = E.delta,
             .unaccel = E.unaccel,
             .mouse   = true,
+            .device  = self.lock(),
         });
     });
 

src/devices/VirtualPointer.cpp

@@ -19,7 +19,11 @@ CVirtualPointer::CVirtualPointer(SP<CVirtualPointerV1Resource> resource) : point
         events.destroy.emit();
     });
 
-    listeners.motion         = pointer->events.move.registerListener([this](std::any d) { pointerEvents.motion.emit(d); });
+    listeners.motion         = pointer->events.move.registerListener([this](std::any d) {
+        auto E   = std::any_cast<SMotionEvent>(d);
+        E.device = self.lock();
+        pointerEvents.motion.emit(E);
+    });
     listeners.motionAbsolute = pointer->events.warp.registerListener([this](std::any d) {
         // we need to unpack the event and add our device here because it's required to calculate the position correctly
         auto E   = std::any_cast<SMotionAbsoluteEvent>(d);

src/managers/input/InputManager.cpp

@@ -90,14 +90,28 @@ CInputManager::~CInputManager() {
 void CInputManager::onMouseMoved(IPointer::SMotionEvent e) {
     static auto PNOACCEL = CConfigValue<Hyprlang::INT>("input:force_no_accel");
 
-    const auto  DELTA = *PNOACCEL == 1 ? e.unaccel : e.delta;
+    Vector2D    delta   = e.delta;
+    Vector2D    unaccel = e.unaccel;
+
+    if (!e.mouse && e.device) {
+        if (e.device->flipX) {
+            delta.x   = -delta.x;
+            unaccel.x = -unaccel.x;
+        }
+        if (e.device->flipY) {
+            delta.y   = -delta.y;
+            unaccel.y = -unaccel.y;
+        }
+    }
+
+    const auto DELTA = *PNOACCEL == 1 ? unaccel : delta;
 
     if (g_pSeatManager->isPointerFrameSkipped)
-        g_pPointerManager->storeMovement((uint64_t)e.timeMs, DELTA, e.unaccel);
+        g_pPointerManager->storeMovement((uint64_t)e.timeMs, DELTA, unaccel);
     else
-        g_pPointerManager->setStoredMovement((uint64_t)e.timeMs, DELTA, e.unaccel);
+        g_pPointerManager->setStoredMovement((uint64_t)e.timeMs, DELTA, unaccel);
 
-    PROTO::relativePointer->sendRelativeMotion((uint64_t)e.timeMs * 1000, DELTA, e.unaccel);
+    PROTO::relativePointer->sendRelativeMotion((uint64_t)e.timeMs * 1000, DELTA, unaccel);
 
     if (e.mouse)
         recheckMouseWarpOnMouseInput();
@@ -1180,6 +1194,9 @@ void CInputManager::setPointerConfigs() {
             const auto LIBINPUTSENS = std::clamp(g_pConfigManager->getDeviceFloat(devname, "sensitivity", "input:sensitivity"), -1.f, 1.f);
             libinput_device_config_accel_set_speed(LIBINPUTDEV, LIBINPUTSENS);
 
+            m->flipX = g_pConfigManager->getDeviceInt(devname, "flip_x", "input:touchpad:flip_x") != 0;
+            m->flipY = g_pConfigManager->getDeviceInt(devname, "flip_y", "input:touchpad:flip_y") != 0;
+
             const auto ACCELPROFILE = g_pConfigManager->getDeviceString(devname, "accel_profile", "input:accel_profile");
             const auto SCROLLPOINTS = g_pConfigManager->getDeviceString(devname, "scroll_points", "input:scroll_points");
 

src/protocols/VirtualPointer.cpp

@@ -19,6 +19,7 @@ CVirtualPointerV1Resource::CVirtualPointerV1Resource(SP<CZwlrVirtualPointerV1> r
             .timeMs  = timeMs,
             .delta   = {wl_fixed_to_double(dx), wl_fixed_to_double(dy)},
             .unaccel = {wl_fixed_to_double(dx), wl_fixed_to_double(dy)},
+            .device  = nullptr,
         });
     });