Implement window sharing with the hl toplevel export proto (#1179)

* implement window sharing

Co-authored-by: Mihai Fufezan <fufexan@protonmail.com>

src/protocols/ToplevelExport.hpp

@@ -0,0 +1,69 @@
+#pragma once
+
+#include "../defines.hpp"
+#include "hyprland-toplevel-export-v1-protocol.h"
+
+#include <list>
+#include <vector>
+
+class CMonitor;
+class CWindow;
+
+struct SToplevelClient {
+    int ref = 0;
+    wl_resource* resource = nullptr;
+
+    bool operator==(const SToplevelClient& other) {
+        return resource == other.resource;
+    }
+};
+
+struct SToplevelFrame {
+    wl_resource* resource = nullptr;
+    SToplevelClient* client = nullptr;
+
+    uint32_t    shmFormat = 0;
+    uint32_t    dmabufFormat = 0;
+    wlr_box     box = { 0 };
+    int         shmStride = 0;
+
+    bool        overlayCursor = false;
+
+    wlr_buffer_cap bufferCap = WLR_BUFFER_CAP_SHM;
+
+    wlr_buffer* buffer = nullptr;
+
+    CWindow*    pWindow = nullptr;
+
+    bool operator==(const SToplevelFrame& other) { 
+        return resource == other.resource && client == other.client;
+    }
+};
+
+class CToplevelExportProtocolManager {
+public:
+    CToplevelExportProtocolManager();
+
+    void        bindManager(wl_client* client, void* data, uint32_t version, uint32_t id);
+    void        captureToplevel(wl_client* client, wl_resource* resource, uint32_t frame, int32_t overlay_cursor, uint32_t handle);
+    void        removeClient(SToplevelClient* client, bool force = false);
+    void        removeFrame(SToplevelFrame* frame, bool force = false);
+    void        copyFrame(wl_client* client, wl_resource* resource, wl_resource* buffer, int32_t ignore_damage);
+
+    void        onMonitorRender(CMonitor* pMonitor);
+    void        displayDestroy();
+    void        onWindowUnmap(CWindow* pWindow);
+
+private:
+    wl_global*                  m_pGlobal = nullptr;
+    std::list<SToplevelFrame>   m_lFrames;
+    std::list<SToplevelClient>  m_lClients;
+
+    wl_listener                 m_liDisplayDestroy;
+
+    std::vector<SToplevelFrame*> m_vFramesAwaitingWrite;
+
+    void        shareFrame(SToplevelFrame* frame);
+    bool        copyFrameDmabuf(SToplevelFrame* frame);
+    bool        copyFrameShm(SToplevelFrame* frame, timespec* now);
+};