Move InlineTextBox::rotation to TextPainter

Source/core/paint/TextPainter.h

 // Copyright 2014 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.
 
 #ifndef TextPainter_h
 #define TextPainter_h
 
+#include "core/rendering/FloatToLayoutUnit.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "platform/fonts/TextBlob.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/Color.h"
+#include "platform/transforms/AffineTransform.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class Font;
 class GraphicsContext;
 class GraphicsContextStateSaver;
 class RenderCombineText;
 class RenderObject;
 class RenderStyle;
@@ skipping 28 matching lines @@
                 && strokeColor == other.strokeColor
                 && emphasisMarkColor == other.emphasisMarkColor
                 && strokeWidth == other.strokeWidth
                 && shadow == other.shadow;
         }
         bool operator!=(const Style& other) { return !(*this == other); }
     };
     static Style textPaintingStyle(RenderObject&, RenderStyle*, bool forceBlackText, bool isPrinting);
     static Style selectionPaintingStyle(RenderObject&, bool haveSelection, bool forceBlackText, bool isPrinting, const Style& textStyle);
 
+    enum RotationDirection { Counterclockwise, Clockwise };
+    static AffineTransform rotation(const FloatRectWillBeLayoutRect& boxRect, RotationDirection);
+
 private:
     void updateGraphicsContext(const Style& style, GraphicsContextStateSaver& saver)
     {
         updateGraphicsContext(m_graphicsContext, style, m_horizontal, saver);
     }
 
     enum PaintInternalStep { PaintText, PaintEmphasisMark };
 
     template <PaintInternalStep step>
     void paintInternalRun(TextRunPaintInfo&, int from, int to);
 
     template <PaintInternalStep step>
     void paintInternal(int startOffset, int endOffset, int truncationPoint, TextBlobPtr* cachedTextBlob = 0);
 
     void paintEmphasisMarkForCombinedText();
 
     GraphicsContext* m_graphicsContext;
     const Font& m_font;
     const TextRun& m_run;
     FloatPoint m_textOrigin;
     FloatRect m_textBounds;
     bool m_horizontal;
     AtomicString m_emphasisMark;
     int m_emphasisMarkOffset;
     RenderCombineText* m_combinedText;
 };
 
+inline AffineTransform TextPainter::rotation(const FloatRectWillBeLayoutRect& boxRect, RotationDirection rotationDirection)
+{
+    return rotationDirection == Clockwise ? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.maxY() - boxRect.x())
+        : AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.maxY(), boxRect.x() + boxRect.maxY());
+}
+
 } // namespace blink
 
 #endif // TextPainter_h