1 files changed, 95 insertions, 0 deletions
diff --git a/widget/nsDragServiceProxy.cpp b/widget/nsDragServiceProxy.cpp
new file mode 100644
index 0000000000..428b114ce5
--- /dev/null
+++ b/widget/nsDragServiceProxy.cpp
@@ -0,0 +1,95 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsDragServiceProxy.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/net/CookieJarSettings.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "nsContentUtils.h"
+
+using mozilla::CSSIntRegion;
+using mozilla::LayoutDeviceIntRect;
+using mozilla::Maybe;
+using mozilla::Nothing;
+using mozilla::Some;
+using mozilla::dom::BrowserChild;
+using mozilla::gfx::DataSourceSurface;
+using mozilla::gfx::SourceSurface;
+using mozilla::gfx::SurfaceFormat;
+using mozilla::ipc::Shmem;
+
+nsDragServiceProxy::nsDragServiceProxy() = default;
+
+nsDragServiceProxy::~nsDragServiceProxy() = default;
+
+nsresult nsDragServiceProxy::InvokeDragSessionImpl(
+    nsIArray* aArrayTransferables, const Maybe<CSSIntRegion>& aRegion,
+    uint32_t aActionType) {
+  NS_ENSURE_STATE(mSourceDocument->GetDocShell());
+  BrowserChild* child = BrowserChild::GetFrom(mSourceDocument->GetDocShell());
+  NS_ENSURE_STATE(child);
+  nsTArray<mozilla::dom::IPCDataTransfer> dataTransfers;
+  nsContentUtils::TransferablesToIPCTransferables(
+      aArrayTransferables, dataTransfers, false, child->Manager(), nullptr);
+
+  nsCOMPtr<nsIPrincipal> principal;
+  if (mSourceNode) {
+    principal = mSourceNode->NodePrincipal();
+  }
+
+  nsCOMPtr<nsIContentSecurityPolicy> csp;
+  if (mSourceDocument) {
+    csp = mSourceDocument->GetCsp();
+  }
+
+  nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
+  cookieJarSettings = mSourceDocument->CookieJarSettings();
+  net::CookieJarSettingsArgs csArgs;
+  net::CookieJarSettings::Cast(cookieJarSettings)->Serialize(csArgs);
+
+  LayoutDeviceIntRect dragRect;
+  if (mHasImage || mSelection) {
+    nsPresContext* pc;
+    RefPtr<SourceSurface> surface;
+    DrawDrag(mSourceNode, aRegion, mScreenPosition, &dragRect, &surface, &pc);
+
+    if (surface) {
+      RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
+      if (dataSurface) {
+        size_t length;
+        int32_t stride;
+        Maybe<Shmem> maybeShm = nsContentUtils::GetSurfaceData(
+            dataSurface, &length, &stride, child);
+        if (maybeShm.isNothing()) {
+          return NS_ERROR_FAILURE;
+        }
+
+        auto surfaceData = maybeShm.value();
+
+        // Save the surface data to shared memory.
+        if (!surfaceData.IsReadable() || !surfaceData.get<char>()) {
+          NS_WARNING("Failed to create shared memory for drag session.");
+          return NS_ERROR_FAILURE;
+        }
+
+        mozilla::Unused << child->SendInvokeDragSession(
+            dataTransfers, aActionType, Some(std::move(surfaceData)), stride,
+            dataSurface->GetFormat(), dragRect, principal, csp, csArgs);
+        StartDragSession();
+        return NS_OK;
+      }
+    }
+  }
+
+  mozilla::Unused << child->SendInvokeDragSession(
+      dataTransfers, aActionType, Nothing(), 0, static_cast<SurfaceFormat>(0),
+      dragRect, principal, csp, csArgs);
+  StartDragSession();
+  return NS_OK;
+}