feat: add resizing on rounded corners

src/Window.cpp

@@ -381,3 +381,33 @@ void CWindow::updateDynamicRules() {
         applyDynamicRule(r);
     }
 }
+
+// check if the point is "hidden" under a rounded corner of the window
+bool CWindow::isInCurvedCorner(double x, double y) {
+    static auto* const ROUNDING   = &g_pConfigManager->getConfigValuePtr("decoration:rounding")->intValue;
+    static auto* const BORDERSIZE = &g_pConfigManager->getConfigValuePtr("general:border_size")->intValue;
+
+    if (BORDERSIZE >= ROUNDING || ROUNDING == 0)
+        return false;
+
+    // (x0, y0), (x0, y1), ... are the center point of rounding at each corner
+    double x0 = m_vRealPosition.vec().x + *ROUNDING;
+    double y0 = m_vRealPosition.vec().y + *ROUNDING;
+    double x1 = m_vRealPosition.vec().x + m_vRealSize.vec().x - *ROUNDING;
+    double y1 = m_vRealPosition.vec().y + m_vRealSize.vec().y - *ROUNDING;
+
+    if (x < x0 && y < y0) {
+        return Vector2D{x0, y0}.distance(Vector2D{x, y}) > (double)*ROUNDING;
+    }
+    if (x > x1 && y < y0) {
+        return Vector2D{x1, y0}.distance(Vector2D{x, y}) > (double)*ROUNDING;
+    }
+    if (x < x0 && y > y1) {
+        return Vector2D{x0, y1}.distance(Vector2D{x, y}) > (double)*ROUNDING;
+    }
+    if (x > x1 && y > y1) {
+        return Vector2D{x1, y1}.distance(Vector2D{x, y}) > (double)*ROUNDING;
+    }
+
+    return false;
+}

src/Window.hpp

@@ -218,6 +218,7 @@ class CWindow {
     bool                   isHidden();
     void                   applyDynamicRule(const SWindowRule& r);
     void                   updateDynamicRules();
+    bool                   isInCurvedCorner(double x, double y);
 
   private:
     // For hidden windows and stuff

src/helpers/Vector2D.cpp

@@ -30,3 +30,9 @@ Vector2D Vector2D::floor() {
 Vector2D Vector2D::clamp(const Vector2D& min, const Vector2D& max) {
     return Vector2D(std::clamp(this->x, min.x, max.x == 0 ? INFINITY : max.x), std::clamp(this->y, min.y, max.y == 0 ? INFINITY : max.y));
 }
+
+double Vector2D::distance(const Vector2D& other) {
+    double dx = x - other.x;
+    double dy = y - other.y;
+    return std::sqrt(dx * dx + dy * dy);
+}

src/helpers/Vector2D.hpp

@@ -39,6 +39,8 @@ class Vector2D {
         return Vector2D(this->x * a.x, this->y * a.y);
     }
 
+    double   distance(const Vector2D& other);
+
     Vector2D clamp(const Vector2D& min, const Vector2D& max = Vector2D());
 
     Vector2D floor();

src/managers/input/InputManager.cpp

@@ -404,7 +404,8 @@ void CInputManager::processMouseDownNormal(wlr_pointer_button_event* e) {
         // check if clicked on gaps/border (borders are hard to click on, doesn't matter how thick it is)
         // TODO take curved corners into consideration
         const auto mouseCoords = g_pInputManager->getMouseCoordsInternal();
-        if (wlr_box_contains_point(&box, mouseCoords.x, mouseCoords.y) && !wlr_box_contains_point(&real, mouseCoords.x, mouseCoords.y)) {
+        if (wlr_box_contains_point(&box, mouseCoords.x, mouseCoords.y) &&
+            (!wlr_box_contains_point(&real, mouseCoords.x, mouseCoords.y) || w->isInCurvedCorner(mouseCoords.x, mouseCoords.y))) {
             g_pKeybindManager->onGapDragEvent(e);
             return;
         }