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
35 namespace WebCore {
36
platformDestroy()37 void Gradient::platformDestroy()
38 {
39 if (m_gradient) {
40 cairo_pattern_destroy(m_gradient);
41 m_gradient = 0;
42 }
43 }
44
platformGradient()45 cairo_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
setPlatformGradientSpaceTransform(const AffineTransform & gradientSpaceTransformation)80 void 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
fill(GraphicsContext * context,const FloatRect & rect)89 void 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