Use new is*Element() helper functions more in rendering code

Source/core/rendering/RenderImage.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
  *
@@ skipping 390 matching lines @@
 {
     Document& document = this->document();
 
     if (document.printing() || !document.frame()->selection().isFocusedAndActive())
         return;
 
     if (paintInfo.context->paintingDisabled() && !paintInfo.context->updatingControlTints())
         return;
 
     Element* focusedElement = document.focusedElement();
-    if (!focusedElement || !focusedElement->hasTagName(areaTag))
+    if (!isHTMLAreaElement(focusedElement))
         return;
 
-    HTMLAreaElement* areaElement = toHTMLAreaElement(focusedElement);
-    if (areaElement->imageElement() != node())
+    HTMLAreaElement& areaElement = toHTMLAreaElement(*focusedElement);
+    if (areaElement.imageElement() != node())
         return;
 
     // Even if the theme handles focus ring drawing for entire elements, it won't do it for
     // an area within an image, so we don't call RenderTheme::supportsFocusRing here.
 
-    Path path = areaElement->computePath(this);
+    Path path = areaElement.computePath(this);
     if (path.isEmpty())
         return;
 
-    RenderStyle* areaElementStyle = areaElement->computedStyle();
+    RenderStyle* areaElementStyle = areaElement.computedStyle();
     unsigned short outlineWidth = areaElementStyle->outlineWidth();
     if (!outlineWidth)
         return;
 
     // FIXME: Clip path instead of context when Skia pathops is ready.
     // https://crbug.com/251206
     GraphicsContextStateSaver savedContext(*paintInfo.context);
     paintInfo.context->clip(absoluteContentBox());
     paintInfo.context->drawFocusRing(path, outlineWidth,
         areaElementStyle->outlineOffset(),
@@ skipping 21 matching lines @@
 void RenderImage::paintIntoRect(GraphicsContext* context, const LayoutRect& rect)
 {
     IntRect alignedRect = pixelSnappedIntRect(rect);
     if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || alignedRect.width() <= 0 || alignedRect.height() <= 0)
         return;
 
     RefPtr<Image> img = m_imageResource->image(alignedRect.width(), alignedRect.height());
     if (!img || img->isNull())
         return;
 
-    HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? toHTMLImageElement(node()) : 0;
+    HTMLImageElement* imageElt = isHTMLImageElement(node()) ? toHTMLImageElement(node()) : 0;
     CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
     Image* image = m_imageResource->image().get();
     bool useLowQualityScaling = shouldPaintAtLowQuality(context, image, image, alignedRect.size());
 
     InspectorInstrumentation::willPaintImage(this);
     context->drawImage(m_imageResource->image(alignedRect.width(), alignedRect.height()).get(), alignedRect, compositeOperator, shouldRespectImageOrientation(), useLowQualityScaling);
     InspectorInstrumentation::didPaintImage(this);
 }
 
 bool RenderImage::boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance bleedAvoidance, InlineFlowBox*) const
@@ skipping 37 matching lines @@
     return foregroundIsKnownToBeOpaqueInRect(backgroundPaintedExtent(), 0);
 }
 
 LayoutUnit RenderImage::minimumReplacedHeight() const
 {
     return m_imageResource->errorOccurred() ? intrinsicSize().height() : LayoutUnit();
 }
 
 HTMLMapElement* RenderImage::imageMap() const
 {
-    HTMLImageElement* i = node() && node()->hasTagName(imgTag) ? toHTMLImageElement(node()) : 0;
+    HTMLImageElement* i = isHTMLImageElement(node()) ? toHTMLImageElement(node()) : 0;
     return i ? i->treeScope().getImageMap(i->fastGetAttribute(usemapAttr)) : 0;
 }
 
 bool RenderImage::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     HitTestResult tempResult(result.hitTestLocation());
     bool inside = RenderReplaced::nodeAtPoint(request, tempResult, locationInContainer, accumulatedOffset, hitTestAction);
 
     if (tempResult.innerNode() && node()) {
         if (HTMLMapElement* map = imageMap()) {
@@ skipping 12 matching lines @@
     if (inside)
         result = tempResult;
     return inside;
 }
 
 void RenderImage::updateAltText()
 {
     if (!node())
         return;
 
-    if (node()->hasTagName(inputTag))
+    if (isHTMLInputElement(*node()))
         m_altText = toHTMLInputElement(node())->altText();
-    else if (node()->hasTagName(imgTag))
+    else if (isHTMLImageElement(*node()))
         m_altText = toHTMLImageElement(node())->altText();
 }
 
 void RenderImage::layout()
 {
     LayoutRectRecorder recorder(*this);
     RenderReplaced::layout();
     updateInnerContentRect();
 }
 
@@ skipping 55 matching lines @@
         return 0;
 
     ImageResource* cachedImage = m_imageResource->cachedImage();
     if (cachedImage && cachedImage->image() && cachedImage->image()->isSVGImage())
         return toSVGImage(cachedImage->image())->embeddedContentBox();
 
     return 0;
 }
 
 } // namespace WebCore