Issue #146 - Part 1: Draw each table's background on their own display

list items.

This patch does the following things:
1. Creates nsDisplayTableBorderCollapse that draws all collapse border
of tables.
2. Stops the use of nsDisplayTableBorderBackground.
3. Lets column and column group frames generate display items.
4. When traversing the table, also traverses the column and column group
frames.
5. For each type of table frame (col group, col, row group, row and
cell), draws their own background.

1 files changed, 7 insertions, 2 deletions

diff --git a/layout/base/nsDisplayList.cpp b/layout/base/nsDisplayList.cpp
index e22230b41..744153831 100644
--- a/layout/base/nsDisplayList.cpp
+++ b/layout/base/nsDisplayList.cpp
@@ -2631,11 +2631,16 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
                                                      const nsRect& aBackgroundRect,
                                                      nsDisplayList* aList,
                                                      bool aAllowWillPaintBorderOptimization,
-                                                     nsStyleContext* aStyleContext)
+                                                     nsStyleContext* aStyleContext,
+                                                     const nsRect& aBackgroundOriginRect)
 {
   nsStyleContext* bgSC = aStyleContext;
   const nsStyleBackground* bg = nullptr;
   nsRect bgRect = aBackgroundRect + aBuilder->ToReferenceFrame(aFrame);
+  nsRect bgOriginRect = bgRect;
+  if (!aBackgroundOriginRect.IsEmpty()) {
+    bgOriginRect = aBackgroundOriginRect + aBuilder->ToReferenceFrame(aFrame);
+  }
   nsPresContext* presContext = aFrame->PresContext();
   bool isThemed = aFrame->IsThemed();
   if (!isThemed) {
@@ -2744,7 +2749,7 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
 
     nsDisplayList thisItemList;
     nsDisplayBackgroundImage* bgItem =
-      new (aBuilder) nsDisplayBackgroundImage(aBuilder, aFrame, i, bgRect, bg);
+      new (aBuilder) nsDisplayBackgroundImage(aBuilder, aFrame, i, bgOriginRect, bg);
 
     if (bgItem->ShouldFixToViewport(aBuilder)) {
       thisItemList.AppendNewToTop(