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-rw-r--r--dom/canvas/WebGLIpdl.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/dom/canvas/WebGLIpdl.h b/dom/canvas/WebGLIpdl.h
index 45a5c5ad64..4c81393b70 100644
--- a/dom/canvas/WebGLIpdl.h
+++ b/dom/canvas/WebGLIpdl.h
@@ -18,6 +18,8 @@
#include "TupleUtils.h"
#include "WebGLTypes.h"
+#include <memory>
+
namespace mozilla {
namespace webgl {
@@ -652,6 +654,32 @@ struct ParamTraits<mozilla::avec3<U>> final {
}
};
+// -
+
+template <class U>
+struct ParamTraits<std::optional<U>> final {
+ using T = std::optional<U>;
+
+ static void Write(MessageWriter* const writer, const T& in) {
+ WriteParam(writer, bool{in});
+ if (in) {
+ WriteParam(writer, *in);
+ }
+ }
+
+ static bool Read(MessageReader* const reader, T* const out) {
+ bool isSome;
+ if (!ReadParam(reader, &isSome)) return false;
+
+ if (!isSome) {
+ out->reset();
+ return true;
+ }
+ out->emplace();
+ return ReadParam(reader, &**out);
+ }
+};
+
} // namespace IPC
#endif