Implement interfaces in PaintInfo and make it a class.

Source/core/rendering/RenderFieldset.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * 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.
@@ skipping 140 matching lines @@
     if (style()->isHorizontalWritingMode()) {
         LayoutUnit yOff = (legend->y() > 0) ? LayoutUnit() : (legend->height() - borderTop()) / 2;
         paintRect.setHeight(paintRect.height() - yOff);
         paintRect.setY(paintRect.y() + yOff);
     } else {
         LayoutUnit xOff = (legend->x() > 0) ? LayoutUnit() : (legend->width() - borderLeft()) / 2;
         paintRect.setWidth(paintRect.width() - xOff);
         paintRect.setX(paintRect.x() + xOff);
     }
 
-    if (!boxShadowShouldBeAppliedToBackground(determineBackgroundBleedAvoidance(paintInfo.context)))
+    if (!boxShadowShouldBeAppliedToBackground(determineBackgroundBleedAvoidance(paintInfo.getContext())))
         paintBoxShadow(paintInfo, paintRect, style(), Normal);
     paintFillLayers(paintInfo, resolveColor(CSSPropertyBackgroundColor), style()->backgroundLayers(), paintRect);
     paintBoxShadow(paintInfo, paintRect, style(), Inset);
 
     if (!style()->hasBorder())
         return;
 
     // Create a clipping region around the legend and paint the border as normal
-    GraphicsContext* graphicsContext = paintInfo.context;
+    GraphicsContext* graphicsContext = paintInfo.getContext();
     GraphicsContextStateSaver stateSaver(*graphicsContext);
 
     // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
     // cases the legend is embedded in the right and bottom borders respectively.
     // https://bugs.webkit.org/show_bug.cgi?id=47236
     if (style()->isHorizontalWritingMode()) {
         LayoutUnit clipTop = paintRect.y();
         LayoutUnit clipHeight = max(static_cast<LayoutUnit>(style()->borderTopWidth()), legend->height() - ((legend->height() - borderTop()) / 2));
         graphicsContext->clipOut(pixelSnappedIntRect(paintRect.x() + legend->x(), clipTop, legend->width(), clipHeight));
     } else {
         LayoutUnit clipLeft = paintRect.x();
         LayoutUnit clipWidth = max(static_cast<LayoutUnit>(style()->borderLeftWidth()), legend->width());
         graphicsContext->clipOut(pixelSnappedIntRect(clipLeft, paintRect.y() + legend->y(), clipWidth, legend->height()));
     }
 
     paintBorder(paintInfo, paintRect, style());
 }
 
 void RenderFieldset::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    if (style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
+    if (style()->visibility() != VISIBLE || paintInfo.getPhase() != PaintPhaseMask)
         return;
 
     LayoutRect paintRect = LayoutRect(paintOffset, size());
     RenderBox* legend = findLegend();
     if (!legend)
         return RenderBlock::paintMask(paintInfo, paintOffset);
 
     // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
     // cases the legend is embedded in the right and bottom borders respectively.
     // https://bugs.webkit.org/show_bug.cgi?id=47236
     if (style()->isHorizontalWritingMode()) {
         LayoutUnit yOff = (legend->y() > 0) ? LayoutUnit() : (legend->height() - borderTop()) / 2;
         paintRect.expand(0, -yOff);
         paintRect.move(0, yOff);
     } else {
         LayoutUnit xOff = (legend->x() > 0) ? LayoutUnit() : (legend->width() - borderLeft()) / 2;
         paintRect.expand(-xOff, 0);
         paintRect.move(xOff, 0);
     }
 
     paintMaskImages(paintInfo, paintRect);
 }
 
 } // namespace WebCore