Issue #1308 - Create nsDisplayTableBackgroundColor to avoid display

list collisions when processing the background color of a table.

This is effectively #146 Part 3c to go along with the other 2 there.

This resolves #1308.

1 files changed, 21 insertions, 0 deletions

diff --git a/layout/base/nsDisplayList.h b/layout/base/nsDisplayList.h
index e9047b113..9cee7b517 100644
--- a/layout/base/nsDisplayList.h
+++ b/layout/base/nsDisplayList.h
@@ -3015,6 +3015,27 @@ protected:
   mozilla::gfx::Color mColor;
 };
 
+class nsDisplayTableBackgroundColor : public nsDisplayBackgroundColor
+{
+public:
+  nsDisplayTableBackgroundColor(nsDisplayListBuilder* aBuilder,
+                                nsIFrame* aFrame,
+                                const nsRect& aBackgroundRect,
+                                const nsStyleBackground* aBackgroundStyle,
+                                nscolor aColor,
+                                nsIFrame* aAncestorFrame)
+    : nsDisplayBackgroundColor(aBuilder, aFrame, aBackgroundRect, aBackgroundStyle, aColor)
+    , mTableType(GetTableTypeFromFrame(aAncestorFrame))
+  { }
+
+  virtual uint32_t GetPerFrameKey() override {
+    return (static_cast<uint8_t>(mTableType) << nsDisplayItem::TYPE_BITS) |
+            nsDisplayItem::GetPerFrameKey();
+  }
+protected:
+  TableType mTableType;
+};
+
 class nsDisplayClearBackground : public nsDisplayItem
 {
 public: