Properly check for a zero-valued floating-point viewport argument

Source/core/dom/ViewportArguments.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
@@ skipping 217 matching lines @@
     if (equalIgnoringCase(valueString, "device-width"))
         return Length(100, ViewportPercentageWidth);
     if (equalIgnoringCase(valueString, "device-height"))
         return Length(100, ViewportPercentageHeight);
 
     float value = numericPrefix(keyString, valueString, document);
 
     if (value < 0)
         return Length(); // auto
 
-    if (!static_cast<int>(value) && document->page() && document->page()->settings().viewportMetaZeroValuesQuirk()) {
+    if (!value && document->page() && document->page()->settings().viewportMetaZeroValuesQuirk()) {
         if (keyString == "width")
             return Length(100, ViewportPercentageWidth);
         if (keyString == "height")
             return Length(100, ViewportPercentageHeight);
     }
 
     return Length(clampLengthValue(value), Fixed);
 }
 
 static float findScaleValue(const String& keyString, const String& valueString, Document* document)
@@ skipping 14 matching lines @@
         return 10;
 
     float value = numericPrefix(keyString, valueString, document);
 
     if (value < 0)
         return ViewportArguments::ValueAuto;
 
     if (value > 10.0)
         reportViewportWarning(document, MaximumScaleTooLargeError, String(), String());
 
-    if (!static_cast<int>(value) && document->page() && document->page()->settings().viewportMetaZeroValuesQuirk() && (keyString == "minimum-scale" || keyString == "maximum-scale"))
+    if (!value && document->page() && document->page()->settings().viewportMetaZeroValuesQuirk() && (keyString == "minimum-scale" || keyString == "maximum-scale"))
         return ViewportArguments::ValueAuto;
 
     return clampScaleValue(value);
 }
 
 static float findUserScalableValue(const String& keyString, const String& valueString, Document* document)
 {
     // yes and no are used as keywords.
     // Numbers >= 1, numbers <= -1, device-width and device-height are mapped to yes.
     // Numbers in the range <-1, 1>, and unknown values, are mapped to no.
@@ skipping 105 matching lines @@
     if (!replacement1.isNull())
         message.replace("%replacement1", replacement1);
     if (!replacement2.isNull())
         message.replace("%replacement2", replacement2);
 
     // FIXME: This message should be moved off the console once a solution to https://bugs.webkit.org/show_bug.cgi?id=103274 exists.
     document->addConsoleMessage(RenderingMessageSource, viewportErrorMessageLevel(errorCode), message);
 }
 
 } // namespace WebCore