Invalidate row/section for backgrounds when cell's geometry changes

third_party/WebKit/Source/core/paint/TableCellPaintInvalidator.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/paint/TableCellPaintInvalidator.h"
+
+#include "core/layout/LayoutTable.h"
+#include "core/layout/LayoutTableCell.h"
+#include "core/layout/LayoutTableCol.h"
+#include "core/layout/LayoutTableRow.h"
+#include "core/layout/LayoutTableSection.h"
+#include "core/paint/BlockPaintInvalidator.h"
+#include "core/paint/ObjectPaintInvalidator.h"
+#include "core/paint/PaintInvalidator.h"
+#include "core/paint/PaintLayer.h"
+
+namespace blink {
+
+PaintInvalidationReason TableCellPaintInvalidator::InvalidatePaint() {
+  // The cell's containing row and section paint backgrounds behind the cell.
+  // If the cell's geometry changed, invalidate the background display items.
+  if (context_.old_location != context_.new_location ||
+      cell_.Size() != cell_.PreviousSize()) {
+    const auto& row = *cell_.Row();
+    if (row.GetPaintInvalidationReason() == kPaintInvalidationNone &&
+        row.StyleRef().HasBackground()) {
+      if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled())
+        context_.parent_context->painting_layer->SetNeedsRepaint();
+      else
+        ObjectPaintInvalidator(row).SlowSetPaintingLayerNeedsRepaint();
+      row.InvalidateDisplayItemClients(kPaintInvalidationForcedByLayout);
+    }
+
+    const auto& section = *row.Section();
+    if (section.GetPaintInvalidationReason() == kPaintInvalidationNone) {
+      bool section_paints_background = section.StyleRef().HasBackground();
+      if (!section_paints_background) {
+        auto col_and_colgroup = section.Table()->ColElementAtAbsoluteColumn(
+            cell_.AbsoluteColumnIndex());
+        if ((col_and_colgroup.col &&
+             col_and_colgroup.col->StyleRef().HasBackground()) ||
+            (col_and_colgroup.colgroup &&
+             col_and_colgroup.colgroup->StyleRef().HasBackground()))
+          section_paints_background = true;
+      }
+      if (section_paints_background) {
+        if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled()) {
+          context_.parent_context->parent_context->painting_layer
+              ->SetNeedsRepaint();
+        } else {
+          ObjectPaintInvalidator(section).SlowSetPaintingLayerNeedsRepaint();
+        }
+        section.InvalidateDisplayItemClients(kPaintInvalidationForcedByLayout);
+      }
+    }
+  }
+
+  return BlockPaintInvalidator(cell_).InvalidatePaint(context_);
+}
+
+}  // namespace blink