Convert images on the GPU on Linux for NVidia cards

sunshine/platform/linux/x11grab.h

@@ -6,6 +6,9 @@
 #include "sunshine/platform/common.h"
 #include "sunshine/utility.h"
 
+// X11 Display
+extern "C" struct _XDisplay;
+
 namespace egl {
 class cursor_t;
 }
@@ -15,8 +18,10 @@ namespace platf::x11 {
 #ifdef SUNSHINE_BUILD_X11
 struct cursor_ctx_raw_t;
 void freeCursorCtx(cursor_ctx_raw_t *ctx);
+void freeDisplay(_XDisplay *xdisplay);
 
 using cursor_ctx_t = util::safe_ptr<cursor_ctx_raw_t, freeCursorCtx>;
+using xdisplay_t = util::safe_ptr<_XDisplay, freeDisplay>;
 
 class cursor_t {
 public:
@@ -34,7 +39,12 @@ public:
 
   cursor_ctx_t ctx;
 };
+
+xdisplay_t make_display();
 #else
+// It's never something different from nullptr
+util::safe_ptr<_XDisplay, std::default_delete<_XDisplay>>;
+
 class cursor_t {
 public:
   static std::optional<cursor_t> make() { return std::nullopt; }
@@ -42,6 +52,8 @@ public:
   void capture(egl::cursor_t &) {}
   void blend(img_t &, int, int) {}
 };
+
+xdisplay_t make_display() { return nullptr; }
 #endif
 } // namespace platf::x11