Fix cull rect computation for SVG{Container,Image,Shape}Painter outlines

Source/core/paint/ObjectPainter.cpp

 // 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.
 
 #include "config.h"
 #include "core/paint/ObjectPainter.h"
 
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/style/ComputedStyle.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 
 namespace blink {
 
+LayoutRect ObjectPainter::outlineBounds(const LayoutRect& objectBounds, const ComputedStyle& style)
+{
+    int outlineOutset;
+    if (style.outlineStyleIsAuto())
+        outlineOutset = GraphicsContext::focusRingOutsetExtent(style.outlineOffset(), style.outlineWidth());
+    else
+        outlineOutset = style.outlineSize();

[fs, 2015/06/08 16:30:51]

This pattern appears to pop up here and there... Maybe it should be moved to
ComputedStyle?

[chrishtr, 2015/06/08 22:59:41]

Sure...do as a followup maybe?

+    LayoutRect outlineBounds(objectBounds);
+    outlineBounds.inflate(outlineOutset);
+    return outlineBounds;
+}
+
 void ObjectPainter::paintFocusRing(const PaintInfo& paintInfo, const ComputedStyle& style, const Vector<LayoutRect>& focusRingRects)
 {
     ASSERT(style.outlineStyleIsAuto());
     Vector<IntRect> focusRingIntRects;
     for (size_t i = 0; i < focusRingRects.size(); ++i)
         focusRingIntRects.append(pixelSnappedIntRect(focusRingRects[i]));
     paintInfo.context->drawFocusRing(focusRingIntRects, style.outlineWidth(), style.outlineOffset(), m_layoutObject.resolveColor(style, CSSPropertyOutlineColor));
 }
 
 void ObjectPainter::paintOutline(const PaintInfo& paintInfo, const LayoutRect& objectBounds, const LayoutRect& visualOverflowBounds)
@@ skipping 339 matching lines @@
         quad[1] = FloatPoint(x1, y2 - std::max(adjacentWidth2, 0));
         quad[2] = FloatPoint(x2, y2 - std::max(-adjacentWidth2, 0));
         quad[3] = FloatPoint(x2, y1 + std::max(-adjacentWidth1, 0));
         break;
     }
 
     graphicsContext->fillPolygon(4, quad, color, antialias);
 }
 
 } // namespace blink