1 /*

     2  * Copyright (C) 2003-6 Apple Computer, 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

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #ifndef Color_h

    27 #define Color_h

    28 

    29 #include <wtf/Platform.h>

    30 

    31 #if PLATFORM(CG)

    32 typedef struct CGColor* CGColorRef;

    33 #endif

    34 

    35 #if PLATFORM(QT)

    36 class QColor;

    37 #endif

    38 

    39 namespace WebCore {

    40 

    41 class String;

    42 class Color;

    43 

    44 typedef unsigned RGBA32;        // RGBA quadruplet

    45 

    46 RGBA32 makeRGB(int r, int g, int b);

    47 RGBA32 makeRGBA(int r, int g, int b, int a);

    48 RGBA32 makeRGBAFromHSLA(double h, double s, double l, double a);

    49 

    50 int differenceSquared(const Color&, const Color&);

    51 

    52 class Color {

    53 public:

    54     Color() : m_color(0), m_valid(false) { }

    55     Color(RGBA32 col) : m_color(col), m_valid(true) { }

    56     Color(int r, int g, int b) : m_color(makeRGB(r, g, b)), m_valid(true) { }

    57     Color(int r, int g, int b, int a) : m_color(makeRGBA(r, g, b, a)), m_valid(true) { }

    58     explicit Color(const String&);

    59     explicit Color(const char*);

    60     

    61     String name() const;

    62     void setNamedColor(const String&);

    63 

    64     bool isValid() const { return m_valid; }

    65 

    66     bool hasAlpha() const { return alpha() < 255; }

    67 

    68     int red() const { return (m_color >> 16) & 0xFF; }

    69     int green() const { return (m_color >> 8) & 0xFF; }

    70     int blue() const { return m_color & 0xFF; }

    71     int alpha() const { return (m_color >> 24) & 0xFF; }

    72     

    73     RGBA32 rgb() const { return m_color; } // Preserve the alpha.

    74     void setRGB(int r, int g, int b) { m_color = makeRGB(r, g, b); m_valid = true; }

    75     void setRGB(RGBA32 rgb) { m_color = rgb; m_valid = true; }

    76     void getRGBA(float& r, float& g, float& b, float& a) const;

    77     void getRGBA(double& r, double& g, double& b, double& a) const;

    78 

    79     Color light() const;

    80     Color dark() const;

    81 

    82     Color blend(const Color&) const;

    83     Color blendWithWhite() const;

    84 

    85 #if PLATFORM(QT)

    86     Color(const QColor&);

    87     operator QColor() const;

    88 #endif

    89 

    90     static bool parseHexColor(const String& name, RGBA32& rgb);

    91 

    92     static const RGBA32 black = 0xFF000000;

    93     static const RGBA32 white = 0xFFFFFFFF;

    94     static const RGBA32 darkGray = 0xFF808080;

    95     static const RGBA32 gray = 0xFFA0A0A0;

    96     static const RGBA32 lightGray = 0xFFC0C0C0;

    97     static const RGBA32 transparent = 0x00000000;

    98 

    99 private:

   100     RGBA32 m_color;

   101     bool m_valid : 1;

   102 };

   103 

   104 inline bool operator==(const Color& a, const Color& b)

   105 {

   106     return a.rgb() == b.rgb() && a.isValid() == b.isValid();

   107 }

   108 

   109 inline bool operator!=(const Color& a, const Color& b)

   110 {

   111     return !(a == b);

   112 }

   113 

   114 Color focusRingColor();

   115 void setFocusRingColorChangeFunction(void (*)());

   116 

   117 #if PLATFORM(CG)

   118 CGColorRef cgColor(const Color&);

   119 #endif

   120 

   121 } // namespace WebCore

   122 

   123 #endif // Color_h