The background is black instead of green

sunshine/platform/linux/cuda.cpp

@@ -213,9 +213,8 @@ public:
       return -1;
     }
 
-    this->sws = std::move(*sws_opt);
-
-    return 0;
+    sws = std::move(*sws_opt);
+    return sws.blank(fb, 0, 0, frame->width, frame->height);
   }
 
   int convert(platf::img_t &img) override {

sunshine/platform/linux/graphics.cpp

@@ -739,6 +739,20 @@ std::optional<sws_t> sws_t::make(int in_width, int in_height, int out_width, int
   return std::move(sws);
 }
 
+int sws_t::blank(gl::frame_buf_t &fb, int offsetX, int offsetY, int width, int height) {
+  auto f = [&]() {
+    std::swap(offsetX, this->offsetX);
+    std::swap(offsetY, this->offsetY);
+    std::swap(width, this->out_width);
+    std::swap(height, this->out_height);
+  };
+
+  f();
+  auto fg = util::fail_guard(f);
+
+  return convert(fb);
+}
+
 std::optional<sws_t> sws_t::make(int in_width, int in_height, int out_width, int out_heigth) {
   auto tex = gl::tex_t::make(2);
   gl::ctx.BindTexture(GL_TEXTURE_2D, tex[0]);

sunshine/platform/linux/graphics.h

@@ -282,6 +282,9 @@ public:
   // Convert the loaded image into the first two framebuffers
   int convert(gl::frame_buf_t &fb);
 
+  // Make an area of the image black
+  int blank(gl::frame_buf_t &fb, int offsetX, int offsetY, int width, int height);
+
   void load_ram(platf::img_t &img);
   void load_vram(img_descriptor_t &img, int offset_x, int offset_y, int texture);