feat: add support for supercircular (e.g. squircles) window corner rounding

example/hyprland.conf

@@ -81,6 +81,7 @@ general {
 # https://wiki.hyprland.org/Configuring/Variables/#decoration
 decoration {
     rounding = 10
+    rounding_power = 2
 
     # Change transparency of focused and unfocused windows
     active_opacity = 1.0

src/config/ConfigDescriptions.hpp

@@ -139,6 +139,12 @@ inline static const std::vector<SConfigOptionDescription> CONFIG_OPTIONS = {
         .type        = CONFIG_OPTION_INT,
         .data        = SConfigOptionDescription::SRangeData{0, 0, 20},
     },
+    SConfigOptionDescription{
+        .value       = "decoration:rounding_power",
+        .description = "rouding power of corners (2 is a circle)",
+        .type        = CONFIG_OPTION_FLOAT,
+        .data        = SConfigOptionDescription::SFloatData{2, 2, 10},
+    },
     SConfigOptionDescription{
         .value       = "decoration:active_opacity",
         .description = "opacity of active windows. [0.0 - 1.0]",

src/config/ConfigManager.cpp

@@ -427,6 +427,7 @@ CConfigManager::CConfigManager() {
     m_pConfig->addConfigValue("debug:colored_stdout_logs", Hyprlang::INT{1});
 
     m_pConfig->addConfigValue("decoration:rounding", Hyprlang::INT{0});
+    m_pConfig->addConfigValue("decoration:rounding_power", {2.F});
     m_pConfig->addConfigValue("decoration:blur:enabled", Hyprlang::INT{1});
     m_pConfig->addConfigValue("decoration:blur:size", Hyprlang::INT{8});
     m_pConfig->addConfigValue("decoration:blur:passes", Hyprlang::INT{1});

src/config/ConfigManager.hpp

@@ -259,6 +259,7 @@ class CConfigManager {
     };
 
     std::unordered_map<std::string, std::function<CWindowOverridableVar<float>*(PHLWINDOW)>> mfWindowProperties = {
+        {"roundingpower", [](const PHLWINDOW& pWindow) { return &pWindow->m_sWindowData.roundingPower; }},
         {"scrollmouse", [](const PHLWINDOW& pWindow) { return &pWindow->m_sWindowData.scrollMouse; }},
         {"scrolltouchpad", [](const PHLWINDOW& pWindow) { return &pWindow->m_sWindowData.scrollTouchpad; }}};
 

src/config/defaultConfig.hpp

@@ -94,6 +94,7 @@ general {
 # https://wiki.hyprland.org/Configuring/Variables/#decoration
 decoration {
     rounding = 10
+    rounding_power = 2
 
     # Change transparency of focused and unfocused windows
     active_opacity = 1.0

src/desktop/Window.cpp

@@ -824,7 +824,8 @@ void CWindow::updateDynamicRules() {
 // it is assumed that the point is within the real window box (m_vRealPosition, m_vRealSize)
 // otherwise behaviour is undefined
 bool CWindow::isInCurvedCorner(double x, double y) {
-    const int ROUNDING = rounding();
+    const int ROUNDING      = rounding();
+    const int ROUNDINGPOWER = roundingPower();
     if (getRealBorderSize() >= ROUNDING)
         return false;
 
@@ -835,16 +836,16 @@ bool CWindow::isInCurvedCorner(double x, double y) {
     double y1 = m_vRealPosition.value().y + m_vRealSize.value().y - ROUNDING;
 
     if (x < x0 && y < y0) {
-        return Vector2D{x0, y0}.distance(Vector2D{x, y}) > (double)ROUNDING;
+        return std::pow(x0 - x, ROUNDINGPOWER) + std::pow(y0 - y, ROUNDINGPOWER) > std::pow((double)ROUNDING, ROUNDINGPOWER);
     }
     if (x > x1 && y < y0) {
-        return Vector2D{x1, y0}.distance(Vector2D{x, y}) > (double)ROUNDING;
+        return std::pow(x - x1, ROUNDINGPOWER) + std::pow(y0 - y, ROUNDINGPOWER) > std::pow((double)ROUNDING, ROUNDINGPOWER);
     }
     if (x < x0 && y > y1) {
-        return Vector2D{x0, y1}.distance(Vector2D{x, y}) > (double)ROUNDING;
+        return std::pow(x0 - x, ROUNDINGPOWER) + std::pow(y - y1, ROUNDINGPOWER) > std::pow((double)ROUNDING, ROUNDINGPOWER);
     }
     if (x > x1 && y > y1) {
-        return Vector2D{x1, y1}.distance(Vector2D{x, y}) > (double)ROUNDING;
+        return std::pow(x - x1, ROUNDINGPOWER) + std::pow(y - y1, ROUNDINGPOWER) > std::pow((double)ROUNDING, ROUNDINGPOWER);
     }
 
     return false;
@@ -1164,13 +1165,21 @@ bool CWindow::opaque() {
 }
 
 float CWindow::rounding() {
-    static auto PROUNDING = CConfigValue<Hyprlang::INT>("decoration:rounding");
+    static auto PROUNDING      = CConfigValue<Hyprlang::INT>("decoration:rounding");
+    static auto PROUNDINGPOWER = CConfigValue<Hyprlang::FLOAT>("decoration:rounding_power");
 
-    float       rounding = m_sWindowData.rounding.valueOr(*PROUNDING);
+    float       roundingPower = m_sWindowData.roundingPower.valueOr(*PROUNDINGPOWER);
+    float       rounding      = m_sWindowData.rounding.valueOr(*PROUNDING) * (roundingPower / 2.0); /* Make perceived roundness consistent. */
 
     return m_sWindowData.noRounding.valueOrDefault() ? 0 : rounding;
 }
 
+float CWindow::roundingPower() {
+    static auto PROUNDINGPOWER = CConfigValue<Hyprlang::FLOAT>("decoration:rounding_power");
+
+    return m_sWindowData.roundingPower.valueOr(*PROUNDINGPOWER);
+}
+
 void CWindow::updateWindowData() {
     const auto PWORKSPACE    = m_pWorkspace;
     const auto WORKSPACERULE = PWORKSPACE ? g_pConfigManager->getWorkspaceRuleFor(PWORKSPACE) : SWorkspaceRule{};

src/desktop/Window.hpp

@@ -183,6 +183,7 @@ struct SWindowData {
     CWindowOverridableVar<bool>               renderUnfocused    = false;
 
     CWindowOverridableVar<int>                rounding;
+    CWindowOverridableVar<float>              roundingPower;
     CWindowOverridableVar<int>                borderSize;
 
     CWindowOverridableVar<float>              scrollMouse;
@@ -414,6 +415,7 @@ class CWindow {
     Vector2D               middle();
     bool                   opaque();
     float                  rounding();
+    float                  roundingPower();
     bool                   canBeTorn();
     void                   setSuspended(bool suspend);
     bool                   visibleOnMonitor(PHLMONITOR pMonitor);

src/desktop/WindowRule.cpp

@@ -8,8 +8,8 @@ static const auto RULES = std::unordered_set<std::string>{
     "float", "fullscreen", "maximize", "noinitialfocus", "pin", "stayfocused", "tile", "renderunfocused",
 };
 static const auto RULES_PREFIX = std::unordered_set<std::string>{
-    "animation", "bordercolor", "bordersize", "center",   "fullscreenstate", "group",          "idleinhibit", "maxsize",       "minsize", "monitor",   "move", "opacity",
-    "plugin:",   "prop",        "pseudo",     "rounding", "scrollmouse",     "scrolltouchpad", "size",        "suppressevent", "tag",     "workspace", "xray",
+    "animation", "bordercolor", "bordersize", "center",   "fullscreenstate", "group",       "idleinhibit",    "maxsize", "minsize",       "monitor", "move",      "opacity",
+    "plugin:",   "prop",        "pseudo",     "rounding", "roundingpower",   "scrollmouse", "scrolltouchpad", "size",    "suppressevent", "tag",     "workspace", "xray",
 };
 
 CWindowRule::CWindowRule(const std::string& rule, const std::string& value, bool isV2, bool isExecRule) : szValue(value), szRule(rule), v2(isV2), execRule(isExecRule) {
@@ -88,4 +88,4 @@ CWindowRule::CWindowRule(const std::string& rule, const std::string& value, bool
             ruleType = RULE_INVALID;
         }
     }
-}
+}