Move InlineTextBox::paint guts into blink::TextPainter.

Source/core/rendering/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/style/RenderStyleConstants.h"
+#include "platform/geometry/FloatPoint.h"
+#include "platform/geometry/FloatRect.h"
+#include "platform/graphics/Color.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+class Font;
+class GraphicsContext;
+class GraphicsContextStateSaver;
+class RenderCombineText;
+class ShadowList;
+class TextRun;
+struct TextRunPaintInfo;
+
+class TextPainter {
+public:
+    struct Style;
+
+    TextPainter(GraphicsContext*, const Font&, const TextRun&, const FloatPoint& textOrigin, const FloatRect& textBounds, bool horizontal);
+    ~TextPainter();
+
+    void setEmphasisMark(const AtomicString&, TextEmphasisPosition);
+    void setCombinedText(RenderCombineText* combinedText) { m_combinedText = combinedText; }
+
+    static void updateGraphicsContext(GraphicsContext*, const Style&, bool horizontal, GraphicsContextStateSaver&);
+
+    void paint(int startOffset, int endOffset, int length, const Style&);
+
+    struct Style {
+        Color fillColor;
+        Color strokeColor;
+        Color emphasisMarkColor;
+        float strokeWidth;
+        const ShadowList* shadow;
+
+        bool operator==(const Style& other)
+        {
+            return fillColor == other.fillColor
+                && strokeColor == other.strokeColor
+                && emphasisMarkColor == other.emphasisMarkColor
+                && strokeWidth == other.strokeWidth
+                && shadow == other.shadow;
+        }
+        bool operator!=(const Style& other) { return !(*this == other); }
+    };
+
+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);
+
+    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;
+};
+
+} // namespace blink
+
+#endif // TextPainter_h