1 files changed, 13 insertions, 12 deletions

diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index 90de72d8d..93eb95099 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -1435,14 +1435,21 @@ public:
    * BuildDisplayListForChild.
    * 
    * See nsDisplayList.h for more information about display lists.
+   * 
+   * @param aDirtyRect content outside this rectangle can be ignored; the
+   * rectangle is in frame coordinates
    */
   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
                                 const nsDisplayListSet& aLists) {}
   /**
    * Displays the caret onto the given display list builder. The caret is
    * painted on top of the rest of the display list items.
+   *
+   * @param aDirtyRect is the dirty rectangle that we're repainting.
    */
   void DisplayCaret(nsDisplayListBuilder* aBuilder,
+                    const nsRect&         aDirtyRect,
                     nsDisplayList*        aList);
 
   /**
@@ -1476,8 +1483,11 @@ public:
   /**
    * Builds a display list for the content represented by this frame,
    * treating this frame as the root of a stacking context.
+   * @param aDirtyRect content outside this rectangle can be ignored; the
+   * rectangle is in frame coordinates
    */
   void BuildDisplayListForStackingContext(nsDisplayListBuilder* aBuilder,
+                                          const nsRect&         aDirtyRect,
                                           nsDisplayList*        aList);
 
   enum {
@@ -1496,6 +1506,7 @@ public:
    */
   void BuildDisplayListForChild(nsDisplayListBuilder*   aBuilder,
                                 nsIFrame*               aChild,
+                                const nsRect&           aDirtyRect,
                                 const nsDisplayListSet& aLists,
                                 uint32_t                aFlags = 0);
 
@@ -3519,23 +3530,13 @@ protected:
   nsRect           mRect;
   nsIContent*      mContent;
   nsStyleContext*  mStyleContext;
-  /**
-   * This bit is used during BuildDisplayList to mark frames that need to
-   * have display items rebuilt. We will descend into them if they are
-   * currently visible, even if they don't intersect the dirty area.
-   */
-  bool mForceDescendIntoIfVisible : 1;
 private:
   nsContainerFrame* mParent;
   nsIFrame*        mNextSibling;  // doubly-linked list of frames
   nsIFrame*        mPrevSibling;  // Do not touch outside SetNextSibling!
 
-  void MarkAbsoluteFramesForDisplayList(nsDisplayListBuilder* aBuilder);
-  public:
-  bool ForceDescendIntoIfVisible() const { return mForceDescendIntoIfVisible; }
-  void SetForceDescendIntoIfVisible(bool aForce) {
-    mForceDescendIntoIfVisible = aForce;
-  }
+  void MarkAbsoluteFramesForDisplayList(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect);
+
   static void DestroyPaintedPresShellList(nsTArray<nsWeakPtr>* list) {
     list->Clear();
     delete list;