Minimize RenderObject* casting to RenderText*

Source/core/editing/CompositeEditCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 595 matching lines @@
 bool CompositeEditCommand::canRebalance(const Position& position) const
 {
     Node* node = position.containerNode();
     if (position.anchorType() != Position::PositionIsOffsetInAnchor || !node || !node->isTextNode())
         return false;
 
     Text* textNode = toText(node);
     if (textNode->length() == 0)
         return false;
 
-    RenderObject* renderer = textNode->renderer();
+    RenderText* renderer = textNode->renderer();
     if (renderer && !renderer->style()->collapseWhiteSpace())
         return false;
 
     return true;
 }
 
 // FIXME: Doesn't go into text nodes that contribute adjacent text (siblings, cousins, etc).
 void CompositeEditCommand::rebalanceWhitespaceAt(const Position& position)
 {
     Node* node = position.containerNode();
@@ skipping 48 matching lines @@
 
 void CompositeEditCommand::prepareWhitespaceAtPositionForSplit(Position& position)
 {
     Node* node = position.deprecatedNode();
     if (!node || !node->isTextNode())
         return;
     Text* textNode = toText(node);
 
     if (textNode->length() == 0)
         return;
-    RenderObject* renderer = textNode->renderer();
+    RenderText* renderer = textNode->renderer();
     if (renderer && !renderer->style()->collapseWhiteSpace())
         return;
 
     // Delete collapsed whitespace so that inserting nbsps doesn't uncollapse it.
     Position upstreamPos = position.upstream();
     deleteInsignificantText(upstreamPos, position.downstream());
     position = upstreamPos.downstream();
 
     VisiblePosition visiblePos(position);
     VisiblePosition previousVisiblePos(visiblePos.previous());
@@ skipping 22 matching lines @@
         rebalanceWhitespaceAt(selection.end());
 }
 
 void CompositeEditCommand::deleteInsignificantText(PassRefPtrWillBeRawPtr<Text> textNode, unsigned start, unsigned end)
 {
     if (!textNode || start >= end)
         return;
 
     document().updateLayout();
 
-    RenderText* textRenderer = toRenderText(textNode->renderer());
+    RenderText* textRenderer = textNode->renderer();
     if (!textRenderer)
         return;
 
     Vector<InlineTextBox*> sortedTextBoxes;
     size_t sortedTextBoxesPosition = 0;
 
     for (InlineTextBox* textBox = textRenderer->firstTextBox(); textBox; textBox = textBox->nextTextBox())
         sortedTextBoxes.append(textBox);
 
     // If there is mixed directionality text, the boxes can be out of order,
@@ skipping 756 matching lines @@
 }
 
 void CompositeEditCommand::trace(Visitor* visitor)
 {
     visitor->trace(m_commands);
     visitor->trace(m_composition);
     EditCommand::trace(visitor);
 }
 
 } // namespace blink