1/*
2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc.  All rights reserved.
3 * Copyright (C) 2007 Alp Toker <alp@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 "PlatformContextCairo.h"
33#include <cairo.h>
34
35namespace WebCore {
36
37void Gradient::platformDestroy()
38{
39    if (m_gradient) {
40        cairo_pattern_destroy(m_gradient);
41        m_gradient = 0;
42    }
43}
44
45cairo_pattern_t* Gradient::platformGradient()
46{
47    if (m_gradient)
48        return m_gradient;
49
50    if (m_radial)
51        m_gradient = cairo_pattern_create_radial(m_p0.x(), m_p0.y(), m_r0, m_p1.x(), m_p1.y(), m_r1);
52    else
53        m_gradient = cairo_pattern_create_linear(m_p0.x(), m_p0.y(), m_p1.x(), m_p1.y());
54
55    Vector<ColorStop>::iterator stopIterator = m_stops.begin();
56    while (stopIterator != m_stops.end()) {
57        cairo_pattern_add_color_stop_rgba(m_gradient, stopIterator->stop, stopIterator->red, stopIterator->green, stopIterator->blue, stopIterator->alpha);
58        ++stopIterator;
59    }
60
61    switch (m_spreadMethod) {
62    case SpreadMethodPad:
63        cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_PAD);
64        break;
65    case SpreadMethodReflect:
66        cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_REFLECT);
67        break;
68    case SpreadMethodRepeat:
69        cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_REPEAT);
70        break;
71    }
72
73    cairo_matrix_t matrix = m_gradientSpaceTransformation;
74    cairo_matrix_invert(&matrix);
75    cairo_pattern_set_matrix(m_gradient, &matrix);
76
77    return m_gradient;
78}
79
80void Gradient::setPlatformGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation)
81{
82    if (m_gradient) {
83        cairo_matrix_t matrix = gradientSpaceTransformation;
84        cairo_matrix_invert(&matrix);
85        cairo_pattern_set_matrix(m_gradient, &matrix);
86    }
87}
88
89void Gradient::fill(GraphicsContext* context, const FloatRect& rect)
90{
91    cairo_t* cr = context->platformContext()->cr();
92
93    context->save();
94    cairo_set_source(cr, platformGradient());
95    cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
96    cairo_fill(cr);
97    context->restore();
98}
99
100} //namespace
101