From 64ffe81c5551d1fabb12aa2d529ed5711bbbe965 Mon Sep 17 00:00:00 2001
From: win7-7 <win7-7@users.noreply.github.com>
Date: Fri, 8 May 2020 01:21:41 +0300
Subject:  Issue #1355 - Better way to create display items for column
 backgrounds

Part 1: Remove current table item, as it's never set.

Part 2: Get rid of generic table painting code, and handle each class separately.

Part 4: Hoist outline skipping into col(group) frame code.

Part 5: Skip box-shadow for table column and column groups.

Part 6: Store column and column group backgrounds separately, and then append them before the rest of the table contents.

Part 7: Pass rects in display list coordinates to AppendBackgroundItemsToTop.

Part 8: Create column and column group background display items as part of the cell's BuildDisplayList.

Part 9: Used cached values instead of calling nsDisplayListBuilder::ToReferenceFrame when possible, since it can be expensive when the requested frame isn't the builder's current frame.

Part 10: Make sure we build display items for table parts where only the normal position is visible, since we may need to create background items for ancestors at that position.

Part 11: Create an AutoBuildingDisplayList when we create background items for table columns and column groups, so that we initialize the invalidation state correctly.
---
 layout/generic/nsFrame.cpp | 44 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 40 insertions(+), 4 deletions(-)

(limited to 'layout/generic/nsFrame.cpp')

diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index c8415a7e70..8ba0bbf124 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -1793,6 +1793,13 @@ void
 nsFrame::DisplayOutlineUnconditional(nsDisplayListBuilder*   aBuilder,
                                      const nsDisplayListSet& aLists)
 {
+  // Per https://drafts.csswg.org/css-tables-3/#global-style-overrides:
+  // "All css properties of table-column and table-column-group boxes are
+  // ignored, except when explicitly specified by this specification."
+  // CSS outlines fall into this category, so we skip them on these boxes.
+
+  MOZ_ASSERT(GetType() !=  nsGkAtoms::tableColGroupFrame && GetType() != nsGkAtoms::tableColFrame);
+
   if (StyleOutline()->mOutlineStyle == NS_STYLE_BORDER_STYLE_NONE) {
     return;
   }
@@ -1839,7 +1846,9 @@ nsFrame::DisplayBackgroundUnconditional(nsDisplayListBuilder* aBuilder,
   if (aBuilder->IsForEventDelivery() || aForceBackground ||
       !StyleBackground()->IsTransparent() || StyleDisplay()->mAppearance) {
     return nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
-        aBuilder, this, GetRectRelativeToSelf(), aLists.BorderBackground());
+        aBuilder, this,
+        GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(this),
+        aLists.BorderBackground());
   }
   return false;
 }
@@ -1872,7 +1881,9 @@ nsFrame::DisplayBorderBackgroundOutline(nsDisplayListBuilder*   aBuilder,
 
   // If there's a themed background, we should not create a border item.
   // It won't be rendered.
-  if (!bgIsThemed && StyleBorder()->HasBorder()) {
+  // Don't paint borders for tables here, since they paint them in a different
+  // order.
+  if (!bgIsThemed && StyleBorder()->HasBorder() && GetType() != nsGkAtoms::tableFrame) {
     aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
       nsDisplayBorder(aBuilder, this));
   }
@@ -2626,8 +2637,33 @@ static bool DescendIntoChild(nsDisplayListBuilder* aBuilder,
     return true;
   }
 
+  if (aChild->IsFrameOfType(nsIFrame::eTablePart)) {
+    // Relative positioning and transforms can cause table parts to move, but we
+    // will still paint the backgrounds for their ancestor parts under them at
+    // their 'normal' position. That means that we must consider the overflow
+    // rects at both positions.
+
+    // We convert the overflow rect into the nsTableFrame's coordinate
+    // space, applying the normal position offset at each step. Then we
+    // compare that against the builder's cached dirty rect in table
+    // coordinate space.
+    const nsIFrame* f = aChild;
+    nsRect normalPositionOverflowRelativeToTable = overflow;
+
+    while (f->IsFrameOfType(nsIFrame::eTablePart)) {
+      normalPositionOverflowRelativeToTable += f->GetNormalPosition();
+      f = f->GetParent();
+    }
+
+    nsDisplayTableBackgroundSet* tableBGs = aBuilder->GetTableBackgroundSet();
+    if (tableBGs &&
+        tableBGs->GetDirtyRect().Intersects(normalPositionOverflowRelativeToTable)) {
+      return true;
+    }
+  }
+
   return false;
- }
+}
 
 void
 nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder*   aBuilder,
@@ -2770,7 +2806,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder*   aBuilder,
     // If you change this, also change IsPseudoStackingContextFromStyle()
     pseudoStackingContext = true;
   }
-  
+
   NS_ASSERTION(!isStackingContext || pseudoStackingContext,
                "Stacking contexts must also be pseudo-stacking-contexts");
 
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