1 files changed, 138 insertions, 0 deletions
diff --git a/dom/media/webvtt/TextTrackRegion.h b/dom/media/webvtt/TextTrackRegion.h
new file mode 100644
index 0000000000..d316d7a30c
--- /dev/null
+++ b/dom/media/webvtt/TextTrackRegion.h
@@ -0,0 +1,138 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 et tw=78: */
+/* 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/. */
+
+#ifndef mozilla_dom_TextTrackRegion_h
+#define mozilla_dom_TextTrackRegion_h
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsString.h"
+#include "nsWrapperCache.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/dom/TextTrack.h"
+#include "mozilla/dom/VTTRegionBinding.h"
+#include "mozilla/Preferences.h"
+
+namespace mozilla::dom {
+
+class GlobalObject;
+class TextTrack;
+
+class TextTrackRegion final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(TextTrackRegion)
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  nsISupports* GetParentObject() const { return mParent; }
+
+  explicit TextTrackRegion(nsISupports* aGlobal);
+
+  /** WebIDL Methods. */
+
+  static already_AddRefed<TextTrackRegion> Constructor(
+      const GlobalObject& aGlobal, ErrorResult& aRv);
+
+  double Lines() const { return mLines; }
+
+  void SetLines(double aLines, ErrorResult& aRv) {
+    if (aLines < 0) {
+      aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+    } else {
+      mLines = aLines;
+    }
+  }
+
+  double Width() const { return mWidth; }
+
+  void SetWidth(double aWidth, ErrorResult& aRv) {
+    if (!InvalidValue(aWidth, aRv)) {
+      mWidth = aWidth;
+    }
+  }
+
+  double RegionAnchorX() const { return mRegionAnchorX; }
+
+  void SetRegionAnchorX(double aVal, ErrorResult& aRv) {
+    if (!InvalidValue(aVal, aRv)) {
+      mRegionAnchorX = aVal;
+    }
+  }
+
+  double RegionAnchorY() const { return mRegionAnchorY; }
+
+  void SetRegionAnchorY(double aVal, ErrorResult& aRv) {
+    if (!InvalidValue(aVal, aRv)) {
+      mRegionAnchorY = aVal;
+    }
+  }
+
+  double ViewportAnchorX() const { return mViewportAnchorX; }
+
+  void SetViewportAnchorX(double aVal, ErrorResult& aRv) {
+    if (!InvalidValue(aVal, aRv)) {
+      mViewportAnchorX = aVal;
+    }
+  }
+
+  double ViewportAnchorY() const { return mViewportAnchorY; }
+
+  void SetViewportAnchorY(double aVal, ErrorResult& aRv) {
+    if (!InvalidValue(aVal, aRv)) {
+      mViewportAnchorY = aVal;
+    }
+  }
+
+  ScrollSetting Scroll() const { return mScroll; }
+
+  void SetScroll(const ScrollSetting& aScroll) {
+    if (aScroll == ScrollSetting::_empty || aScroll == ScrollSetting::Up) {
+      mScroll = aScroll;
+    }
+  }
+
+  void GetId(nsAString& aId) const { aId = mId; }
+
+  void SetId(const nsAString& aId) { mId = aId; }
+
+  /** end WebIDL Methods. */
+
+  // Helper to aid copying of a given TextTrackRegion's width, lines,
+  // anchor, viewport and scroll values.
+  void CopyValues(TextTrackRegion& aRegion);
+
+  // -----helpers-------
+  const nsAString& Id() const { return mId; }
+
+ private:
+  ~TextTrackRegion() = default;
+
+  nsCOMPtr<nsISupports> mParent;
+  nsString mId;
+  double mWidth;
+  long mLines;
+  double mRegionAnchorX;
+  double mRegionAnchorY;
+  double mViewportAnchorX;
+  double mViewportAnchorY;
+  ScrollSetting mScroll;
+
+  // Helper to ensure new value is in the range: 0.0% - 100.0%; throws
+  // an IndexSizeError otherwise.
+  inline bool InvalidValue(double aValue, ErrorResult& aRv) {
+    if (aValue < 0.0 || aValue > 100.0) {
+      aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+      return true;
+    }
+
+    return false;
+  }
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_TextTrackRegion_h