Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/SVGMaskPainter.cpp

 // Copyright 2015 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/SVGMaskPainter.h"
 
 #include "core/layout/svg/LayoutSVGResourceMasker.h"
 #include "core/paint/CompositingRecorder.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/TransformRecorder.h"
 #include "platform/graphics/paint/CompositingDisplayItem.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 #include "platform/graphics/paint/PaintController.h"
 
 namespace blink {
 
-bool SVGMaskPainter::prepareEffect(const LayoutObject& object, GraphicsContext* context)
+bool SVGMaskPainter::prepareEffect(const LayoutObject& object, GraphicsContext& context)
 {
-    ASSERT(context);
     ASSERT(m_mask.style());
     ASSERT_WITH_SECURITY_IMPLICATION(!m_mask.needsLayout());
 
     m_mask.clearInvalidationMask();
 
     FloatRect paintInvalidationRect = object.paintInvalidationRectInLocalCoordinates();
     if (paintInvalidationRect.isEmpty() || !m_mask.element()->hasChildren())
         return false;
 
-    context->paintController().createAndAppend<BeginCompositingDisplayItem>(object, SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect);
+    context.paintController().createAndAppend<BeginCompositingDisplayItem>(object, SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect);
     return true;
 }
 
-void SVGMaskPainter::finishEffect(const LayoutObject& object, GraphicsContext* context)
+void SVGMaskPainter::finishEffect(const LayoutObject& object, GraphicsContext& context)
 {
-    ASSERT(context);
     ASSERT(m_mask.style());
     ASSERT_WITH_SECURITY_IMPLICATION(!m_mask.needsLayout());
 
     FloatRect paintInvalidationRect = object.paintInvalidationRectInLocalCoordinates();
     {
         ColorFilter maskLayerFilter = m_mask.style()->svgStyle().maskType() == MT_LUMINANCE
             ? ColorFilterLuminanceToAlpha : ColorFilterNone;
-        CompositingRecorder maskCompositing(*context, object, SkXfermode::kDstIn_Mode, 1, &paintInvalidationRect, maskLayerFilter);
+        CompositingRecorder maskCompositing(context, object, SkXfermode::kDstIn_Mode, 1, &paintInvalidationRect, maskLayerFilter);
         drawMaskForLayoutObject(context, object, object.objectBoundingBox(), paintInvalidationRect);
     }
 
-    context->paintController().endItem<EndCompositingDisplayItem>(object);
+    context.paintController().endItem<EndCompositingDisplayItem>(object);
 }
 
-void SVGMaskPainter::drawMaskForLayoutObject(GraphicsContext* context, const LayoutObject& layoutObject, const FloatRect& targetBoundingBox, const FloatRect& targetPaintInvalidationRect)
+void SVGMaskPainter::drawMaskForLayoutObject(GraphicsContext& context, const LayoutObject& layoutObject, const FloatRect& targetBoundingBox, const FloatRect& targetPaintInvalidationRect)
 {
-    ASSERT(context);
-
     AffineTransform contentTransformation;
     RefPtr<const SkPicture> maskContentPicture = m_mask.createContentPicture(contentTransformation, targetBoundingBox, context);
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*context, layoutObject, DisplayItem::SVGMask, LayoutPoint()))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(context, layoutObject, DisplayItem::SVGMask, LayoutPoint()))
         return;
 
-    LayoutObjectDrawingRecorder drawingRecorder(*context, layoutObject, DisplayItem::SVGMask, targetPaintInvalidationRect, LayoutPoint());
-    context->save();
-    context->concatCTM(contentTransformation);
-    context->drawPicture(maskContentPicture.get());
-    context->restore();
+    LayoutObjectDrawingRecorder drawingRecorder(context, layoutObject, DisplayItem::SVGMask, targetPaintInvalidationRect, LayoutPoint());
+    context.save();
+    context.concatCTM(contentTransformation);
+    context.drawPicture(maskContentPicture.get());
+    context.restore();
 }
 
 }