1 files changed, 204 insertions, 0 deletions
diff --git a/layout/base/GeckoMVMContext.cpp b/layout/base/GeckoMVMContext.cpp
new file mode 100644
index 0000000000..43a3826385
--- /dev/null
+++ b/layout/base/GeckoMVMContext.cpp
@@ -0,0 +1,204 @@
+/* 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 "GeckoMVMContext.h"
+
+#include "mozilla/DisplayPortUtils.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/Services.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/VisualViewport.h"
+#include "nsCOMPtr.h"
+#include "nsGlobalWindowInner.h"
+#include "nsIDOMEventListener.h"
+#include "nsIFrame.h"
+#include "nsIObserverService.h"
+#include "nsLayoutUtils.h"
+#include "nsPIDOMWindow.h"
+#include "nsPresContext.h"
+
+namespace mozilla {
+
+GeckoMVMContext::GeckoMVMContext(dom::Document* aDocument,
+                                 PresShell* aPresShell)
+    : mDocument(aDocument), mPresShell(aPresShell) {
+  if (nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow()) {
+    mEventTarget = window->GetChromeEventHandler();
+  }
+}
+
+void GeckoMVMContext::AddEventListener(const nsAString& aType,
+                                       nsIDOMEventListener* aListener,
+                                       bool aUseCapture) {
+  if (mEventTarget) {
+    mEventTarget->AddEventListener(aType, aListener, aUseCapture);
+  }
+}
+
+void GeckoMVMContext::RemoveEventListener(const nsAString& aType,
+                                          nsIDOMEventListener* aListener,
+                                          bool aUseCapture) {
+  if (mEventTarget) {
+    mEventTarget->RemoveEventListener(aType, aListener, aUseCapture);
+  }
+}
+
+void GeckoMVMContext::AddObserver(nsIObserver* aObserver, const char* aTopic,
+                                  bool aOwnsWeak) {
+  if (nsCOMPtr<nsIObserverService> observerService =
+          services::GetObserverService()) {
+    observerService->AddObserver(aObserver, aTopic, aOwnsWeak);
+  }
+}
+
+void GeckoMVMContext::RemoveObserver(nsIObserver* aObserver,
+                                     const char* aTopic) {
+  if (nsCOMPtr<nsIObserverService> observerService =
+          services::GetObserverService()) {
+    observerService->RemoveObserver(aObserver, aTopic);
+  }
+}
+
+void GeckoMVMContext::Destroy() {
+  mEventTarget = nullptr;
+  mDocument = nullptr;
+  mPresShell = nullptr;
+}
+
+nsViewportInfo GeckoMVMContext::GetViewportInfo(
+    const ScreenIntSize& aDisplaySize) const {
+  MOZ_ASSERT(mDocument);
+  return mDocument->GetViewportInfo(aDisplaySize);
+}
+
+CSSToLayoutDeviceScale GeckoMVMContext::CSSToDevPixelScale() const {
+  MOZ_ASSERT(mPresShell);
+  return mPresShell->GetPresContext()->CSSToDevPixelScale();
+}
+
+float GeckoMVMContext::GetResolution() const {
+  MOZ_ASSERT(mPresShell);
+  return mPresShell->GetResolution();
+}
+
+bool GeckoMVMContext::SubjectMatchesDocument(nsISupports* aSubject) const {
+  MOZ_ASSERT(mDocument);
+  return SameCOMIdentity(aSubject, ToSupports(mDocument));
+}
+
+Maybe<CSSRect> GeckoMVMContext::CalculateScrollableRectForRSF() const {
+  MOZ_ASSERT(mPresShell);
+  if (nsIScrollableFrame* rootScrollableFrame =
+          mPresShell->GetRootScrollFrameAsScrollable()) {
+    return Some(
+        CSSRect::FromAppUnits(nsLayoutUtils::CalculateScrollableRectForFrame(
+            rootScrollableFrame, nullptr)));
+  }
+  return Nothing();
+}
+
+bool GeckoMVMContext::IsResolutionUpdatedByApz() const {
+  MOZ_ASSERT(mPresShell);
+  return mPresShell->IsResolutionUpdatedByApz();
+}
+
+LayoutDeviceMargin
+GeckoMVMContext::ScrollbarAreaToExcludeFromCompositionBounds() const {
+  MOZ_ASSERT(mPresShell);
+  return LayoutDeviceMargin::FromAppUnits(
+      nsLayoutUtils::ScrollbarAreaToExcludeFromCompositionBoundsFor(
+          mPresShell->GetRootScrollFrame()),
+      mPresShell->GetPresContext()->AppUnitsPerDevPixel());
+}
+
+Maybe<LayoutDeviceIntSize> GeckoMVMContext::GetContentViewerSize() const {
+  MOZ_ASSERT(mPresShell);
+  LayoutDeviceIntSize result;
+  if (nsLayoutUtils::GetContentViewerSize(mPresShell->GetPresContext(),
+                                          result)) {
+    return Some(result);
+  }
+  return Nothing();
+}
+
+bool GeckoMVMContext::AllowZoomingForDocument() const {
+  MOZ_ASSERT(mDocument);
+  return nsLayoutUtils::AllowZoomingForDocument(mDocument);
+}
+
+bool GeckoMVMContext::IsInReaderMode() const {
+  MOZ_ASSERT(mDocument);
+  nsString uri;
+  if (NS_FAILED(mDocument->GetDocumentURI(uri))) {
+    return false;
+  }
+  static auto readerModeUriPrefix = u"about:reader"_ns;
+  return StringBeginsWith(uri, readerModeUriPrefix);
+}
+
+bool GeckoMVMContext::IsDocumentLoading() const {
+  MOZ_ASSERT(mDocument);
+  return mDocument->GetReadyStateEnum() == dom::Document::READYSTATE_LOADING;
+}
+
+void GeckoMVMContext::SetResolutionAndScaleTo(float aResolution,
+                                              ResolutionChangeOrigin aOrigin) {
+  MOZ_ASSERT(mPresShell);
+  mPresShell->SetResolutionAndScaleTo(aResolution, aOrigin);
+}
+
+void GeckoMVMContext::SetVisualViewportSize(const CSSSize& aSize) {
+  MOZ_ASSERT(mPresShell);
+  mPresShell->SetVisualViewportSize(
+      nsPresContext::CSSPixelsToAppUnits(aSize.width),
+      nsPresContext::CSSPixelsToAppUnits(aSize.height));
+}
+
+void GeckoMVMContext::PostVisualViewportResizeEventByDynamicToolbar() {
+  MOZ_ASSERT(mDocument);
+
+  // We only fire visual viewport events and don't want to cause any explicit
+  // reflows here since in general we don't use the up-to-date visual viewport
+  // size for layout.
+  if (auto* window = nsGlobalWindowInner::Cast(mDocument->GetInnerWindow())) {
+    window->VisualViewport()->PostResizeEvent();
+  }
+}
+
+void GeckoMVMContext::UpdateDisplayPortMargins() {
+  MOZ_ASSERT(mPresShell);
+  if (nsIFrame* root = mPresShell->GetRootScrollFrame()) {
+    bool hasDisplayPort = DisplayPortUtils::HasDisplayPort(root->GetContent());
+    bool hasResolution = mPresShell->GetResolution() != 1.0f;
+    if (!hasDisplayPort && !hasResolution) {
+      // We only want to update the displayport if there is one already, or
+      // add one if there's a resolution on the document (see bug 1225508
+      // comment 1).
+      return;
+    }
+    nsRect displayportBase = nsRect(
+        nsPoint(0, 0), nsLayoutUtils::CalculateCompositionSizeForFrame(root));
+    // We only create MobileViewportManager for root content documents. If that
+    // ever changes we'd need to limit the size of this displayport base rect
+    // because non-toplevel documents have no limit on their size.
+    MOZ_ASSERT(
+        mPresShell->GetPresContext()->IsRootContentDocumentCrossProcess());
+    DisplayPortUtils::SetDisplayPortBaseIfNotSet(root->GetContent(),
+                                                 displayportBase);
+    nsIScrollableFrame* scrollable = do_QueryFrame(root);
+    DisplayPortUtils::CalculateAndSetDisplayPortMargins(
+        scrollable, DisplayPortUtils::RepaintMode::Repaint);
+  }
+}
+
+void GeckoMVMContext::Reflow(const CSSSize& aNewSize) {
+  MOZ_ASSERT(mPresShell);
+
+  RefPtr<PresShell> presShell = mPresShell;
+  presShell->ResizeReflowIgnoreOverride(CSSPixel::ToAppUnits(aNewSize.width),
+                                        CSSPixel::ToAppUnits(aNewSize.height),
+                                        ResizeReflowOptions::NoOption);
+}
+
+}  // namespace mozilla