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102 lines
3.6 KiB
102 lines
3.6 KiB
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/*
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Copyright (c) 2003,2004,2005 Clarence Dang <dang@kde.org>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __kp_color_h__
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#define __kp_color_h__
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#include <tqcolor.h>
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class TQDataStream;
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//
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// kpColor is an object-oriented abstraction of TQRgb, with the additional
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// restriction of following the KolourPaint convention of only supporting
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// totally transparent and totally opaque colors. It also provides better
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// error handling, reporting (noisy kdError()'s) and recovery.
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//
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// In general, you should pass around kpColor objects instead of TQRgb
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// and TQColor. Only convert an opaque kpColor to a TQColor (using toTQColor())
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// if you need to draw something onscreen. Constructing a kpColor object
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// from TQColor is probably wrong since onscreen representations of color
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// are not guaranteed to be faithful (due to TQColor color allocation).
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//
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class kpColor
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{
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public:
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kpColor ();
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kpColor (int red, int green, int blue, bool isTransparent = false);
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kpColor (const TQRgb &rgba);
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kpColor (const kpColor &rhs);
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friend TQDataStream &operator<< (TQDataStream &stream, const kpColor &color);
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friend TQDataStream &operator>> (TQDataStream &stream, kpColor &color);
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kpColor &operator= (const kpColor &rhs);
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bool operator== (const kpColor &rhs) const;
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bool operator!= (const kpColor &rhs) const;
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static int processSimilarity (double colorSimilarity);
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static const int Exact; // "isSimilarTo (rhs, kpColor::Exact)" == "== rhs"
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// Usage: isSimilarTo (rhs, kpColor::processSimilarity (.1)) checks for
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// Color Similarity within 10%
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bool isSimilarTo (const kpColor &rhs, int processedSimilarity) const;
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~kpColor ();
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static const kpColor invalid;
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static const kpColor transparent;
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bool isValid () const;
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int red () const;
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int green () const;
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int blue () const;
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int alpha () const;
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bool isTransparent () const;
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bool isOpaque () const;
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// Cast operators will most likely result in careless conversions so
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// use explicit functions instead:
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TQRgb toTQRgb () const;
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// (only valid if isOpaque())
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// (const TQColor & return results in fewer color reallocations)
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const TQColor &toTQColor () const;
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TQColor maskColor () const;
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private:
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bool m_rgbaIsValid;
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TQRgb m_rgba;
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mutable bool m_colorCacheIsValid;
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mutable TQColor m_colorCache;
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};
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#endif // __kp_color_h__
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