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      1 /*
      2  * Copyright (C) 2000 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 2000 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2000 Dirk Mueller (mueller (at) kde.org)
      5  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
      6  * Copyright (C) 2006 Graham Dennis (graham.dennis (at) gmail.com)
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  *
     23  */
     24 
     25 #ifndef BorderValue_h
     26 #define BorderValue_h
     27 
     28 #include "core/css/StyleColor.h"
     29 #include "core/rendering/style/RenderStyleConstants.h"
     30 #include "platform/graphics/Color.h"
     31 
     32 namespace blink {
     33 
     34 class BorderValue {
     35 friend class RenderStyle;
     36 public:
     37     BorderValue()
     38         : m_color(0)
     39         , m_colorIsCurrentColor(true)
     40         , m_width(3)
     41         , m_style(BNONE)
     42         , m_isAuto(AUTO_OFF)
     43     {
     44     }
     45 
     46     bool nonZero(bool checkStyle = true) const
     47     {
     48         return width() && (!checkStyle || m_style != BNONE);
     49     }
     50 
     51     bool isTransparent() const
     52     {
     53         return !m_colorIsCurrentColor && !m_color.alpha();
     54     }
     55 
     56     bool isVisible(bool checkStyle = true) const
     57     {
     58         return nonZero(checkStyle) && !isTransparent() && (!checkStyle || m_style != BHIDDEN);
     59     }
     60 
     61     bool operator==(const BorderValue& o) const
     62     {
     63         return m_width == o.m_width && m_style == o.m_style && m_color == o.m_color && m_colorIsCurrentColor == o.m_colorIsCurrentColor;
     64     }
     65 
     66     // The default width is 3px, but if the style is none we compute a value of 0 (in RenderStyle itself)
     67     bool visuallyEqual(const BorderValue& o) const
     68     {
     69         if (m_style == BNONE && o.m_style == BNONE)
     70             return true;
     71         if (m_style == BHIDDEN && o.m_style == BHIDDEN)
     72             return true;
     73         return *this == o;
     74     }
     75 
     76     bool operator!=(const BorderValue& o) const
     77     {
     78         return !(*this == o);
     79     }
     80 
     81     void setColor(const StyleColor& color)
     82     {
     83         m_color = color.resolve(Color());
     84         m_colorIsCurrentColor = color.isCurrentColor();
     85     }
     86 
     87     StyleColor color() const { return m_colorIsCurrentColor ? StyleColor::currentColor() : StyleColor(m_color); }
     88 
     89     unsigned width() const { return m_width; }
     90 
     91     EBorderStyle style() const { return static_cast<EBorderStyle>(m_style); }
     92     void setStyle(EBorderStyle style) { m_style = style; }
     93 
     94 protected:
     95     Color m_color;
     96     unsigned m_colorIsCurrentColor : 1;
     97 
     98     unsigned m_width : 26;
     99     unsigned m_style : 4; // EBorderStyle
    100 
    101     // This is only used by OutlineValue but moved here to keep the bits packed.
    102     unsigned m_isAuto : 1; // OutlineIsAuto
    103 };
    104 
    105 } // namespace blink
    106 
    107 #endif // BorderValue_h
    108