[Line Layout API] Add LineLayoutSVGInline and LineLayoutSVGTextPath

third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/layout/svg/SVGTextLayoutEngine.h"
 
+#include "core/layout/api/LineLayoutAPIShim.h"
+#include "core/layout/api/LineLayoutSVGTextPath.h"
 #include "core/layout/svg/LayoutSVGInlineText.h"
-#include "core/layout/svg/LayoutSVGTextPath.h"
 #include "core/layout/svg/SVGTextChunkBuilder.h"
 #include "core/layout/svg/SVGTextLayoutEngineBaseline.h"
 #include "core/layout/svg/SVGTextLayoutEngineSpacing.h"
 #include "core/layout/svg/line/SVGInlineFlowBox.h"
 #include "core/layout/svg/line/SVGInlineTextBox.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/SVGLengthContext.h"
 #include "core/svg/SVGTextContentElement.h"
 
 namespace blink {
@@ skipping 130 matching lines @@
 
 void SVGTextLayoutEngine::beginTextPathLayout(SVGInlineFlowBox* flowBox)
 {
     // Build text chunks for all <textPath> children, using the line layout algorithm.
     // This is needeed as text-anchor is just an additional startOffset for text paths.
     SVGTextLayoutEngine lineLayout(m_layoutAttributes);
     lineLayout.m_textLengthSpacingInEffect = m_textLengthSpacingInEffect;
     lineLayout.layoutCharactersInTextBoxes(flowBox);
 
     m_inPathLayout = true;
-    LayoutSVGTextPath* textPath = &toLayoutSVGTextPath(flowBox->layoutObject());
+    LineLayoutSVGTextPath textPath = LineLayoutSVGTextPath(flowBox->lineLayoutItem());
 
-    Path path = textPath->layoutPath();
+    Path path = textPath.layoutPath();
     if (path.isEmpty())
         return;
     m_textPathCalculator = new Path::PositionCalculator(path);
     m_textPathLength = path.length();
-    m_textPathStartOffset = textPath->calculateStartOffset(m_textPathLength);
+    m_textPathStartOffset = textPath.calculateStartOffset(m_textPathLength);
 
     SVGTextPathChunkBuilder textPathChunkLayoutBuilder;
     textPathChunkLayoutBuilder.processTextChunks(lineLayout.m_lineLayoutBoxes);
 
     m_textPathStartOffset += textPathChunkLayoutBuilder.totalTextAnchorShift();
     m_textPathCurrentOffset = m_textPathStartOffset;
 
     // Eventually handle textLength adjustments.
     SVGLengthAdjustType lengthAdjust = SVGLengthAdjustUnknown;
     float desiredTextLength = 0;
 
-    if (SVGTextContentElement* textContentElement = SVGTextContentElement::elementFromLayoutObject(textPath)) {
+    if (SVGTextContentElement* textContentElement = SVGTextContentElement::elementFromLayoutObject(LineLayoutAPIShim::layoutObjectFrom(textPath))) {

[leviw_travelin_and_unemployed, 2016/02/08 08:09:48]

It'd be good to push this down and rename
SVGTextContentElement::elementFromLayoutObject to elementFromLineLayoutItem.

         SVGLengthContext lengthContext(textContentElement);
         lengthAdjust = textContentElement->lengthAdjust()->currentValue()->enumValue();
         if (textContentElement->textLengthIsSpecifiedByUser())
             desiredTextLength = textContentElement->textLength()->currentValue()->value(lengthContext);
         else
             desiredTextLength = 0;
     }
 
     if (!desiredTextLength)
         return;
@@ skipping 346 matching lines @@
     }
 
     if (!didStartTextFragment)
         return;
 
     // Close last open fragment, if needed.
     recordTextFragment(textBox);
 }
 
 } // namespace blink