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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 #include <cairo.h>
     33 
     34 namespace WebCore {
     35 
     36 void Gradient::platformDestroy()
     37 {
     38     if (m_gradient) {
     39         cairo_pattern_destroy(m_gradient);
     40         m_gradient = 0;
     41     }
     42 }
     43 
     44 cairo_pattern_t* Gradient::platformGradient()
     45 {
     46     if (m_gradient)
     47         return m_gradient;
     48 
     49     if (m_radial)
     50         m_gradient = cairo_pattern_create_radial(m_p0.x(), m_p0.y(), m_r0, m_p1.x(), m_p1.y(), m_r1);
     51     else
     52         m_gradient = cairo_pattern_create_linear(m_p0.x(), m_p0.y(), m_p1.x(), m_p1.y());
     53 
     54     Vector<ColorStop>::iterator stopIterator = m_stops.begin();
     55     while (stopIterator != m_stops.end()) {
     56         cairo_pattern_add_color_stop_rgba(m_gradient, stopIterator->stop, stopIterator->red, stopIterator->green, stopIterator->blue, stopIterator->alpha);
     57         ++stopIterator;
     58     }
     59 
     60     switch (m_spreadMethod) {
     61     case SpreadMethodPad:
     62         cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_PAD);
     63         break;
     64     case SpreadMethodReflect:
     65         cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_REFLECT);
     66         break;
     67     case SpreadMethodRepeat:
     68         cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_REPEAT);
     69         break;
     70     }
     71 
     72     cairo_matrix_t matrix = m_gradientSpaceTransformation;
     73     cairo_matrix_invert(&matrix);
     74     cairo_pattern_set_matrix(m_gradient, &matrix);
     75 
     76     return m_gradient;
     77 }
     78 
     79 void Gradient::fill(GraphicsContext* context, const FloatRect& rect)
     80 {
     81     cairo_t* cr = context->platformContext();
     82 
     83     context->save();
     84     cairo_set_source(cr, platformGradient());
     85     cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
     86     cairo_fill(cr);
     87     context->restore();
     88 }
     89 
     90 } //namespace
     91