Add video node visualization

gui/WarpGraphModel.h

@@ -20,8 +20,21 @@ enum class WarpNodeType : uint8_t {
   kVirtualSink,
   kVirtualSource,
   kApplication,
+  kVideoSource,
+  kVideoSink,
 };
 
+inline bool nodeHasVolume(WarpNodeType type) {
+  switch (type) {
+  case WarpNodeType::kVideoSource:
+  case WarpNodeType::kVideoSink:
+  case WarpNodeType::kUnknown:
+    return false;
+  default:
+    return true;
+  }
+}
+
 struct WarpNodeData {
   warppipe::NodeInfo info;
   std::vector<warppipe::PortInfo> inputPorts;