Make SVG painting independent of GraphicsContext's alpha state

Source/core/paint/SVGShapePainter.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/SVGShapePainter.h"
 
 #include "core/paint/GraphicsContextAnnotator.h"
 #include "core/paint/ObjectPainter.h"
 #include "core/paint/RenderDrawingRecorder.h"
@@ skipping 37 matching lines @@
 {
     ANNOTATE_GRAPHICS_CONTEXT(paintInfo, &m_renderSVGShape);
     if (paintInfo.phase != PaintPhaseForeground
         || m_renderSVGShape.style()->visibility() == HIDDEN
         || m_renderSVGShape.isShapeEmpty())
         return;
 
     PaintInfo paintInfoBeforeFiltering(paintInfo);
     FloatRect boundingBox = m_renderSVGShape.paintInvalidationRectInLocalCoordinates();
 
-    // FIXME: Remove this state saver when SVGRenderSupport::updateGraphicsContext
-    // no longer affects the global alpha state. See crbug.com/453225
-    GraphicsContextStateSaver stateSaver(*paintInfoBeforeFiltering.context);
-
     TransformRecorder transformRecorder(*paintInfoBeforeFiltering.context, m_renderSVGShape.displayItemClient(), m_renderSVGShape.localTransform());
     {
         SVGRenderingContext renderingContext(m_renderSVGShape, paintInfoBeforeFiltering);
         if (renderingContext.applyClipMaskAndFilterIfNecessary()) {
             RenderDrawingRecorder recorder(renderingContext.paintInfo().context, m_renderSVGShape, renderingContext.paintInfo().phase, boundingBox);
             if (!recorder.canUseCachedDrawing()) {
                 const SVGRenderStyle& svgStyle = m_renderSVGShape.style()->svgStyle();
                 if (svgStyle.shapeRendering() == SR_CRISPEDGES)
                     renderingContext.paintInfo().context->setShouldAntialias(false);
 
@@ skipping 162 matching lines @@
     tempPath.clear();
     if (m_renderSVGShape.style()->svgStyle().capStyle() == SquareCap)
         tempPath.addRect(RenderSVGPath::zeroLengthSubpathRect(linecapPosition, m_renderSVGShape.strokeWidth()));
     else
         tempPath.addEllipse(RenderSVGPath::zeroLengthSubpathRect(linecapPosition, m_renderSVGShape.strokeWidth()));
 
     return &tempPath;
 }
 
 } // namespace blink