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      1 /*
      2  * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc.  All rights reserved.
      3  * Copyright (C) 2007 Alp Toker <alp (at) atoker.com>
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "Gradient.h"
     29 
     30 #include "CSSParser.h"
     31 #include "GraphicsContext.h"
     32 
     33 #include <QGradient>
     34 #include <QPainter>
     35 
     36 namespace WebCore {
     37 
     38 void Gradient::platformDestroy()
     39 {
     40     delete m_gradient;
     41     m_gradient = 0;
     42 }
     43 
     44 QGradient* Gradient::platformGradient()
     45 {
     46     if (m_gradient)
     47         return m_gradient;
     48 
     49     if (m_radial)
     50         m_gradient = new QRadialGradient(m_p1.x(), m_p1.y(), m_r1, m_p0.x(), m_p0.y());
     51     else
     52         m_gradient = new QLinearGradient(m_p0.x(), m_p0.y(), m_p1.x(), m_p1.y());
     53 
     54     QColor stopColor;
     55     Vector<ColorStop>::iterator stopIterator = m_stops.begin();
     56     qreal lastStop(0.0);
     57     const qreal lastStopDiff = 0.0000001;
     58     while (stopIterator != m_stops.end()) {
     59         stopColor.setRgbF(stopIterator->red, stopIterator->green, stopIterator->blue, stopIterator->alpha);
     60         if (qFuzzyCompare(lastStop, qreal(stopIterator->stop)))
     61             lastStop = stopIterator->stop + lastStopDiff;
     62         else
     63             lastStop = stopIterator->stop;
     64         if (m_radial && m_r0)
     65             lastStop = m_r0 / m_r1 + lastStop * (1.0f - m_r0 / m_r1);
     66         m_gradient->setColorAt(lastStop, stopColor);
     67         ++stopIterator;
     68     }
     69 
     70     switch (m_spreadMethod) {
     71     case SpreadMethodPad:
     72         m_gradient->setSpread(QGradient::PadSpread);
     73         break;
     74     case SpreadMethodReflect:
     75         m_gradient->setSpread(QGradient::ReflectSpread);
     76         break;
     77     case SpreadMethodRepeat:
     78         m_gradient->setSpread(QGradient::RepeatSpread);
     79         break;
     80     }
     81 
     82     return m_gradient;
     83 }
     84 
     85 void Gradient::fill(GraphicsContext* context, const FloatRect& rect)
     86 {
     87     context->platformContext()->fillRect(rect, *platformGradient());
     88 }
     89 
     90 } //namespace
     91