internal: fix a few asan reported leaks on exit of hyprland (#5852)

* notifications: free cairo images on destruction

asan reports a leak on exit if we dont free the image we created in the
draw function. add a destructor and free images on exit.

* compositor: destroy wlroots types on exit

there are a few types not being destroyed on exit and causing a leak on
exit in wlroots reported by asan, add those.

* cursormgr: ensure we destroy cursor mgr on exit

add a destructor and call wlr_xcursor_manager_destroy on the manager on
destruction, leak reported by asan.

* keybindmgr: free state and keymap

add missing keymap_unref on creation, and add a destructor and free the
state on exit. leak reported by asan.

* skeyboard: add destructor and free state

free the state on destruction of keyboard, reported as leak by asan

src/managers/CursorManager.cpp

@@ -53,6 +53,11 @@ CCursorManager::CCursorManager() {
     static auto P = g_pHookSystem->hookDynamic("monitorLayoutChanged", [this](void* self, SCallbackInfo& info, std::any param) { this->updateTheme(); });
 }
 
+CCursorManager::~CCursorManager() {
+    if (m_pWLRXCursorMgr)
+        wlr_xcursor_manager_destroy(m_pWLRXCursorMgr);
+}
+
 void CCursorManager::dropBufferRef(CCursorManager::CCursorBuffer* ref) {
     std::erase_if(m_vCursorBuffers, [ref](const auto& buf) { return buf.get() == ref; });
 }

src/managers/CursorManager.hpp

@@ -13,6 +13,7 @@ struct wlr_xwayland;
 class CCursorManager {
   public:
     CCursorManager();
+    ~CCursorManager();
 
     wlr_buffer*      getCursorBuffer();
 

src/managers/KeybindManager.cpp

@@ -116,6 +116,11 @@ CKeybindManager::CKeybindManager() {
     });
 }
 
+CKeybindManager::~CKeybindManager() {
+    if (m_pXKBTranslationState)
+        xkb_state_unref(m_pXKBTranslationState);
+}
+
 void CKeybindManager::addKeybind(SKeybind kb) {
     m_lKeybinds.push_back(kb);
 
@@ -219,6 +224,7 @@ void CKeybindManager::updateXKBTranslationState() {
 
     xkb_context_unref(PCONTEXT);
     m_pXKBTranslationState = xkb_state_new(PKEYMAP);
+    xkb_keymap_unref(PKEYMAP);
 }
 
 bool CKeybindManager::ensureMouseBindState() {

src/managers/KeybindManager.hpp

@@ -58,6 +58,7 @@ struct SParsedKey {
 class CKeybindManager {
   public:
     CKeybindManager();
+    ~CKeybindManager();
 
     bool                                                              onKeyEvent(wlr_keyboard_key_event*, SKeyboard*);
     bool                                                              onAxisEvent(wlr_pointer_axis_event*);