Invalidate first line display item clients when first line style changes

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * 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 2278 matching lines @@
     }
     if (!haveNormalFlowChild && hasLineIfEmpty()) {
         const FontMetrics& fontMetrics = firstLineStyle()->fontMetrics();
         return fontMetrics.ascent()
             + (lineHeight(true, lineDirection, PositionOfInteriorLineBoxes) - fontMetrics.height()) / 2
             + (lineDirection == HorizontalLine ? borderTop() + paddingTop() : borderRight() + paddingRight());
     }
     return -1;
 }
 
-static inline bool isLayoutBlockFlowOrLayoutButton(LayoutObject* layoutObject)
-{
-    // We include isLayoutButton in this check because buttons are implemented
-    // using flex box but should still support first-line|first-letter.
-    // The flex box and grid specs require that flex box and grid do not
-    // support first-line|first-letter, though.
-    // FIXME: Remove when buttons are implemented with align-items instead
-    // of flex box.
-    return layoutObject->isLayoutBlockFlow() || layoutObject->isLayoutButton();
-}
-
-LayoutBlock* LayoutBlock::firstLineBlock() const
+LayoutBlock* LayoutBlock::firstLineStyleBlock() const
 {
     LayoutBlock* firstLineBlock = const_cast<LayoutBlock*>(this);
     bool hasPseudo = false;
     while (true) {
         hasPseudo = firstLineBlock->style()->hasPseudoStyle(FIRST_LINE);
         if (hasPseudo)
             break;
         LayoutObject* parentBlock = firstLineBlock->parent();
         if (firstLineBlock->isReplaced() || firstLineBlock->isFloatingOrOutOfFlowPositioned()
             || !parentBlock
-            || !isLayoutBlockFlowOrLayoutButton(parentBlock))
+            || !parentBlock->canHaveFirstLineOrFirstLetterStyle())
             break;
         ASSERT_WITH_SECURITY_IMPLICATION(parentBlock->isLayoutBlock());
         if (toLayoutBlock(parentBlock)->firstChild() != firstLineBlock)
             break;
         firstLineBlock = toLayoutBlock(parentBlock);
     }
 
     if (!hasPseudo)
         return nullptr;
 
     return firstLineBlock;
 }
 
+LayoutBlockFlow* LayoutBlock::firstLineContainer() const
+{
+    for (LayoutObject* child = firstChild(); child && !child->isFloatingOrOutOfFlowPositioned() && child->isLayoutBlockFlow(); child = toLayoutBlock(child)->firstChild()) {
+        if (child->childrenInline())
+            return toLayoutBlockFlow(child);
+    }
+    return nullptr;
+}
+
 // Helper methods for obtaining the last line, computing line counts and heights for line counts
 // (crawling into blocks).
 static bool shouldCheckLines(LayoutObject* obj)
 {
     return !obj->isFloatingOrOutOfFlowPositioned()
         && obj->isLayoutBlock() && obj->style()->height().isAuto()
         && (!obj->isDeprecatedFlexibleBox() || obj->style()->boxOrient() == VERTICAL);
 }
 
 static int getHeightForLineCount(LayoutBlock* block, int lineCount, bool includeBottom, int& count)
@@ skipping 567 matching lines @@
 void LayoutBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
 {
     showLayoutObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink