1 files changed, 118 insertions, 0 deletions
diff --git a/dom/canvas/nsICanvasRenderingContextInternal.cpp b/dom/canvas/nsICanvasRenderingContextInternal.cpp
new file mode 100644
index 0000000000..c463a00a1a
--- /dev/null
+++ b/dom/canvas/nsICanvasRenderingContextInternal.cpp
@@ -0,0 +1,118 @@
+/* -*- Mode: C++; tab-width: 40; 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 "nsICanvasRenderingContextInternal.h"
+
+#include "mozilla/dom/CanvasUtils.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/PresShell.h"
+#include "nsPIDOMWindow.h"
+#include "nsRefreshDriver.h"
+
+nsICanvasRenderingContextInternal::nsICanvasRenderingContextInternal() =
+    default;
+
+nsICanvasRenderingContextInternal::~nsICanvasRenderingContextInternal() =
+    default;
+
+mozilla::PresShell* nsICanvasRenderingContextInternal::GetPresShell() {
+  if (mCanvasElement) {
+    return mCanvasElement->OwnerDoc()->GetPresShell();
+  }
+  return nullptr;
+}
+
+nsIGlobalObject* nsICanvasRenderingContextInternal::GetParentObject() const {
+  if (mCanvasElement) {
+    return mCanvasElement->OwnerDoc()->GetScopeObject();
+  }
+  if (mOffscreenCanvas) {
+    return mOffscreenCanvas->GetParentObject();
+  }
+  return nullptr;
+}
+
+nsIPrincipal* nsICanvasRenderingContextInternal::PrincipalOrNull() const {
+  if (mCanvasElement) {
+    return mCanvasElement->NodePrincipal();
+  }
+  if (mOffscreenCanvas) {
+    nsIGlobalObject* global = mOffscreenCanvas->GetParentObject();
+    if (global) {
+      return global->PrincipalOrNull();
+    }
+  }
+  return nullptr;
+}
+
+nsICookieJarSettings* nsICanvasRenderingContextInternal::GetCookieJarSettings()
+    const {
+  if (mCanvasElement) {
+    return mCanvasElement->OwnerDoc()->CookieJarSettings();
+  }
+
+  // If there is an offscreen canvas, attempt to retrieve its owner window
+  // and return the cookieJarSettings for the window's document, if available.
+  if (mOffscreenCanvas) {
+    nsCOMPtr<nsPIDOMWindowInner> win =
+        do_QueryInterface(mOffscreenCanvas->GetOwnerGlobal());
+
+    if (win) {
+      return win->GetExtantDoc()->CookieJarSettings();
+    }
+
+    // If the owner window cannot be retrieved, check if there is a current
+    // worker and return its cookie jar settings if available.
+    mozilla::dom::WorkerPrivate* worker =
+        mozilla::dom::GetCurrentThreadWorkerPrivate();
+
+    if (worker) {
+      return worker->CookieJarSettings();
+    }
+  }
+
+  return nullptr;
+}
+
+void nsICanvasRenderingContextInternal::RemovePostRefreshObserver() {
+  if (mRefreshDriver) {
+    mRefreshDriver->RemovePostRefreshObserver(this);
+    mRefreshDriver = nullptr;
+  }
+}
+
+void nsICanvasRenderingContextInternal::AddPostRefreshObserverIfNecessary() {
+  if (!GetPresShell() || !GetPresShell()->GetPresContext() ||
+      !GetPresShell()->GetPresContext()->RefreshDriver()) {
+    return;
+  }
+  mRefreshDriver = GetPresShell()->GetPresContext()->RefreshDriver();
+  mRefreshDriver->AddPostRefreshObserver(this);
+}
+
+void nsICanvasRenderingContextInternal::DoSecurityCheck(
+    nsIPrincipal* aPrincipal, bool aForceWriteOnly, bool aCORSUsed) {
+  if (mCanvasElement) {
+    mozilla::CanvasUtils::DoDrawImageSecurityCheck(mCanvasElement, aPrincipal,
+                                                   aForceWriteOnly, aCORSUsed);
+  } else if (mOffscreenCanvas) {
+    mozilla::CanvasUtils::DoDrawImageSecurityCheck(mOffscreenCanvas, aPrincipal,
+                                                   aForceWriteOnly, aCORSUsed);
+  }
+}
+
+bool nsICanvasRenderingContextInternal::ShouldResistFingerprinting(
+    mozilla::RFPTarget aTarget) const {
+  if (mCanvasElement) {
+    return mCanvasElement->OwnerDoc()->ShouldResistFingerprinting(aTarget);
+  }
+  if (mOffscreenCanvas) {
+    return mOffscreenCanvas->ShouldResistFingerprinting(aTarget);
+  }
+  // Last resort, just check the global preference
+  return nsContentUtils::ShouldResistFingerprinting("Fallback", aTarget);
+}