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      1 /*
      2  * Copyright (c) 2013, Opera Software ASA. 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 Opera Software ASA 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 BorderImageLength_h
     32 #define BorderImageLength_h
     33 
     34 #include "platform/Length.h"
     35 
     36 namespace blink {
     37 
     38 // Represents an individual computed border image width or outset.
     39 //
     40 // http://www.w3.org/TR/css3-background/#border-image-width
     41 // http://www.w3.org/TR/css3-background/#border-image-outset
     42 class BorderImageLength {
     43 public:
     44     BorderImageLength(double number)
     45         : m_number(number)
     46         , m_type(NumberType)
     47     {
     48     }
     49 
     50     BorderImageLength(const Length& length)
     51         : m_length(length)
     52         , m_number(0)
     53         , m_type(LengthType)
     54     {
     55     }
     56 
     57     bool isNumber() const { return m_type == NumberType; }
     58     bool isLength() const { return m_type == LengthType; }
     59 
     60     const Length& length() const { ASSERT(isLength()); return m_length; }
     61     Length& length() { ASSERT(isLength()); return m_length; }
     62 
     63     double number() const { ASSERT(isNumber()); return m_number; }
     64 
     65     bool operator==(const BorderImageLength& other) const
     66     {
     67         return m_type == other.m_type && m_length == other.m_length && m_number == other.m_number;
     68     }
     69 
     70     bool isZero() const
     71     {
     72         return (isLength() && m_length.isZero()) || (isNumber() && m_number);
     73     }
     74 
     75 private:
     76     // Ideally we would put the 2 following fields in a union, but Length has a constructor,
     77     // a destructor and a copy assignment which isn't allowed.
     78     Length m_length;
     79     double m_number;
     80     enum {
     81         LengthType,
     82         NumberType
     83     } m_type;
     84 };
     85 
     86 } // namespace blink
     87 
     88 #endif // BorderImageLength_h
     89