Prepare for hardware encoders

sunshine/platform/common.h

@@ -68,7 +68,7 @@ enum class capture_e : int {
 class display_t {
 public:
   virtual capture_e snapshot(img_t *img, bool cursor) = 0;
-  virtual std::unique_ptr<img_t> alloc_img() = 0;
+  virtual std::shared_ptr<img_t> alloc_img() = 0;
 
   virtual ~display_t() = default;
 };

sunshine/platform/linux.cpp

@@ -176,8 +176,8 @@ struct x11_attr_t : public display_t {
     return capture_e::ok;
   }
 
-  std::unique_ptr<img_t> alloc_img() override {
-    return std::make_unique<x11_img_t>();
+  std::shared_ptr<img_t> alloc_img() override {
+    return std::make_shared<x11_img_t>();
   }
 
   xdisplay_t xdisplay;
@@ -251,8 +251,8 @@ struct shm_attr_t : public x11_attr_t {
     return capture_e::ok;
   }
 
-  std::unique_ptr<img_t> alloc_img() override {
-    return std::make_unique<shm_img_t>();
+  std::shared_ptr<img_t> alloc_img() override {
+    return std::make_shared<shm_img_t>();
   }
 
   int init() {

sunshine/platform/windows_dxgi.cpp

@@ -339,8 +339,8 @@ public:
     return capture_e::ok;
   }
 
-  std::unique_ptr<::platf::img_t> alloc_img() override {
-    auto img = std::make_unique<img_t>();
+  std::shared_ptr<::platf::img_t> alloc_img() override {
+    auto img = std::make_shared<img_t>();
 
     img->data   = nullptr;
     img->height = 0;