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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef CSSToLengthConversionData_h
     32 #define CSSToLengthConversionData_h
     33 
     34 #include "wtf/Assertions.h"
     35 #include "wtf/Noncopyable.h"
     36 
     37 namespace WebCore {
     38 
     39 class RenderStyle;
     40 
     41 class CSSToLengthConversionData {
     42 public:
     43     CSSToLengthConversionData(const RenderStyle* style, const RenderStyle* rootStyle, float zoom, bool computingFontSize = false)
     44         : m_style(style)
     45         , m_rootStyle(rootStyle)
     46         , m_zoom(zoom)
     47         , m_useEffectiveZoom(false)
     48         , m_computingFontSize(computingFontSize)
     49     {
     50         ASSERT(zoom > 0);
     51     }
     52     CSSToLengthConversionData(const RenderStyle* style, const RenderStyle* rootStyle, bool computingFontSize = false)
     53         : m_style(style)
     54         , m_rootStyle(rootStyle)
     55         , m_useEffectiveZoom(true)
     56         , m_computingFontSize(computingFontSize)
     57     {
     58     }
     59     const RenderStyle& style() const { return *m_style; }
     60     const RenderStyle& rootStyle() const { return *m_rootStyle; }
     61     float zoom() const;
     62     bool computingFontSize() const { return m_computingFontSize; }
     63 
     64     void setStyle(const RenderStyle* style) { m_style = style; }
     65     void setRootStyle(const RenderStyle* rootStyle) { m_rootStyle = rootStyle; }
     66 
     67     CSSToLengthConversionData copyWithAdjustedZoom(float newZoom) const
     68     {
     69         return CSSToLengthConversionData(m_style, m_rootStyle, newZoom, m_computingFontSize);
     70     }
     71 
     72 private:
     73     const RenderStyle* m_style;
     74     const RenderStyle* m_rootStyle;
     75     float m_zoom;
     76     bool m_useEffectiveZoom;
     77     bool m_computingFontSize;
     78 };
     79 
     80 } // namespace WebCore
     81 
     82 #endif
     83