Bug 1298886 - Fire magnify gesture events in the parent process if APZ is enabled but APZ zooming is disabled. r=botond,dvander

MozReview-Commit-ID: 1yhJW7OhI0A

gfx/layers/ipc/APZCTreeManagerChild.cpp

@@ -8,6 +8,7 @@
 
 #include "InputData.h"                  // for InputData
 #include "mozilla/dom/TabParent.h"      // for TabParent
+#include "mozilla/layers/APZCCallbackHelper.h" // for APZCCallbackHelper
 #include "mozilla/layers/RemoteCompositorSession.h" // for RemoteCompositorSession
 
 namespace mozilla {
@@ -241,6 +242,26 @@ APZCTreeManagerChild::RecvHandleTap(const TapType& aType,
   return true;
 }
 
+bool
+APZCTreeManagerChild::RecvNotifyPinchGesture(const PinchGestureType& aType,
+                                             const ScrollableLayerGuid& aGuid,
+                                             const LayoutDeviceCoord& aSpanChange,
+                                             const Modifiers& aModifiers)
+{
+  // This will only get sent from the GPU process to the parent process, so
+  // this function should never get called in the content process.
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // We want to handle it in this process regardless of what the target guid
+  // of the pinch is. This may change in the future.
+  if (mCompositorSession &&
+      mCompositorSession->GetWidget()) {
+    APZCCallbackHelper::NotifyPinchGesture(aType, aSpanChange, aModifiers, mCompositorSession->GetWidget());
+  }
+  return true;
+}
+
 void
 APZCTreeManagerChild::OnProcessingError(
         Result aCode,