Adjust visual overflow rect for rounded/shifted ascent/descent

third_party/WebKit/Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 1958 matching lines @@
         std::min(logical_left_side, logical_visual_overflow.X());
     logical_right_side =
         std::max(logical_right_side, logical_visual_overflow.MaxX());
   }
 
   LayoutUnit logical_top = FirstTextBox()->LogicalTopVisualOverflow();
   LayoutUnit logical_width = logical_right_side - logical_left_side;
   LayoutUnit logical_height =
       LastTextBox()->LogicalBottomVisualOverflow() - logical_top;
 
+  // Inflate visual overflow if we have adjusted ascent/descent causing the
+  // painted glyphs to overflow the layout geometries based on the adjusted
+  // ascent/descent.
+  unsigned inflation_for_ascent = 0;
+  unsigned inflation_for_descent = 0;
+  const auto* font_data =
+      StyleRef(FirstTextBox()->IsFirstLineStyle()).GetFont().PrimaryFont();
+  if (font_data)
+    inflation_for_ascent = font_data->VisualOverflowInflationForAscent();
+  if (LastTextBox()->IsFirstLineStyle() != FirstTextBox()->IsFirstLineStyle()) {
+    font_data =
+        StyleRef(LastTextBox()->IsFirstLineStyle()).GetFont().PrimaryFont();
+  }
+  if (font_data)
+    inflation_for_descent = font_data->VisualOverflowInflationForDescent();
+  logical_top -= LayoutUnit(inflation_for_ascent);
+  logical_height += LayoutUnit(inflation_for_ascent + inflation_for_descent);
+
   LayoutRect rect(logical_left_side, logical_top, logical_width,
                   logical_height);
   if (!Style()->IsHorizontalWritingMode())
     rect = rect.TransposedRect();
   return rect;
 }
 
 LayoutRect LayoutText::LocalVisualRect() const {
   if (Style()->Visibility() != EVisibility::kVisible)
     return LayoutRect();
@@ skipping 123 matching lines @@
   LayoutRect rect = LayoutRect(
       IntRect(FirstRunX(), FirstRunY(), lines_box.Width(), lines_box.Height()));
   LayoutBlock* block = ContainingBlock();
   if (block && HasTextBoxes())
     block->AdjustChildDebugRect(rect);
 
   return rect;
 }
 
 }  // namespace blink