CSS Length calculation with MediaValues

Source/core/css/MediaValues.h

 // 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.
 
 #ifndef MediaValues_h
 #define MediaValues_h
 
 #include "core/css/MediaQueryEvaluator.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Document;
 
-class MediaValues : public RefCounted<MediaValues> {
+class MediaValues : public RefCounted<MediaValues>, public CSSLengthData {
 public:
     enum MediaValuesMode { CachingMode,
         DynamicMode };
 
     enum PointerDeviceType { TouchPointer,
         MousePointer,
         NoPointer,
         UnknownPointer };
 
 
-    static PassRefPtr<MediaValues> create(Document*, MediaValuesMode);
+    static PassRefPtr<MediaValues> create(const Document&, MediaValuesMode);
     static PassRefPtr<MediaValues> create(LocalFrame*, RenderStyle*, MediaValuesMode);
     static PassRefPtr<MediaValues> create(MediaValuesMode,
         int viewportWidth,
         int viewportHeight,
         int deviceWidth,
         int deviceHeight,
         float devicePixelRatio,
         int colorBitsPerComponent,
         int monochromeBitsPerComponent,
         PointerDeviceType,
         int defaultFontSize,
+        int computedFontSize,
+        bool hasXHeight,
+        double xHeight,
+        double zeroWidth,
         bool threeDEnabled,
         bool scanMediaType,
         bool screenMediaType,
         bool printMediaType,
-        bool strictMode);
+        bool strictMode,
+        float effectiveZoom);
     PassRefPtr<MediaValues> copy() const;
     bool isSafeToSendToAnotherThread() const;
 
     int viewportWidth() const;
     int viewportHeight() const;
     int deviceWidth() const;
     int deviceHeight() const;
     float devicePixelRatio() const;
     int colorBitsPerComponent() const;
     int monochromeBitsPerComponent() const;
     PointerDeviceType pointer() const;
     int defaultFontSize() const;
+    int computedFontSize() const;
     bool threeDEnabled() const;
     bool scanMediaType() const;
     bool screenMediaType() const;
     bool printMediaType() const;
     bool strictMode() const;
+    float effectiveZoom() const;
     RenderStyle* style() const { return m_style.get(); }
     Document* document() const;
 
+    virtual float zoom() const;
+    virtual bool computingFontSize() const;
+    virtual double fontSpecifiedSize() const;
+    virtual double fontComputedSize() const;
+    virtual double rootFontSpecifiedSize() const;
+    virtual double rootFontComputedSize() const;
+    virtual bool hasXHeight() const;
+    virtual double xHeight() const;
+    virtual double zeroWidth() const;
+    virtual bool hasRoot() const;
+
+    virtual double viewportWidthPercent() const;
+    virtual double viewportHeightPercent() const;
+    virtual double viewportMinPercent() const;
+    virtual double viewportMaxPercent() const;
+
 private:
     MediaValues(LocalFrame* frame, PassRefPtr<RenderStyle> style, MediaValuesMode mode)
         : m_style(style)
         , m_frame(frame)
         , m_mode(mode)
         , m_viewportWidth(0)
         , m_viewportHeight(0)
         , m_deviceWidth(0)
         , m_deviceHeight(0)
         , m_devicePixelRatio(0)
         , m_colorBitsPerComponent(0)
         , m_monochromeBitsPerComponent(0)
         , m_pointer(UnknownPointer)
         , m_defaultFontSize(0)
+        , m_computedFontSize(0)
+        , m_hasXHeight(false)
+        , m_xHeight(0.0)
+        , m_zeroWidth(0.0)
         , m_threeDEnabled(false)
         , m_scanMediaType(false)
         , m_screenMediaType(false)
         , m_printMediaType(false)
         , m_strictMode(false)
+        , m_effectiveZoom(1.0)
     {
     }
 
     RefPtr<RenderStyle> m_style;
     LocalFrame* m_frame;
     MediaValuesMode m_mode;
 
     // Members variables beyond this point must be thread safe, since they're copied to the parser thread
     int m_viewportWidth;
     int m_viewportHeight;
     int m_deviceWidth;
     int m_deviceHeight;
     float m_devicePixelRatio;
     int m_colorBitsPerComponent;
     int m_monochromeBitsPerComponent;
     PointerDeviceType m_pointer;
     int m_defaultFontSize;
+    int m_computedFontSize;
+    bool m_hasXHeight;
+    double m_xHeight;
+    double m_zeroWidth;
     bool m_threeDEnabled;
     bool m_scanMediaType;
     bool m_screenMediaType;
     bool m_printMediaType;
     bool m_strictMode;
+    float m_effectiveZoom;
 };
 
 } // namespace
 #endif