1 /*
2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
6 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 */
23
24 #include "config.h"
25
26 #if ENABLE(FILTERS)
27 #include "FEOffset.h"
28
29 #include "Filter.h"
30 #include "GraphicsContext.h"
31 #include "RenderTreeAsText.h"
32 #include "TextStream.h"
33
34 namespace WebCore {
35
FEOffset(Filter * filter,float dx,float dy)36 FEOffset::FEOffset(Filter* filter, float dx, float dy)
37 : FilterEffect(filter)
38 , m_dx(dx)
39 , m_dy(dy)
40 {
41 }
42
create(Filter * filter,float dx,float dy)43 PassRefPtr<FEOffset> FEOffset::create(Filter* filter, float dx, float dy)
44 {
45 return adoptRef(new FEOffset(filter, dx, dy));
46 }
47
dx() const48 float FEOffset::dx() const
49 {
50 return m_dx;
51 }
52
setDx(float dx)53 void FEOffset::setDx(float dx)
54 {
55 m_dx = dx;
56 }
57
dy() const58 float FEOffset::dy() const
59 {
60 return m_dy;
61 }
62
setDy(float dy)63 void FEOffset::setDy(float dy)
64 {
65 m_dy = dy;
66 }
67
determineAbsolutePaintRect()68 void FEOffset::determineAbsolutePaintRect()
69 {
70 FloatRect paintRect = inputEffect(0)->absolutePaintRect();
71 Filter* filter = this->filter();
72 paintRect.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy));
73 paintRect.intersect(maxEffectRect());
74 setAbsolutePaintRect(enclosingIntRect(paintRect));
75 }
76
apply()77 void FEOffset::apply()
78 {
79 if (hasResult())
80 return;
81 FilterEffect* in = inputEffect(0);
82 in->apply();
83 if (!in->hasResult())
84 return;
85
86 ImageBuffer* resultImage = createImageBufferResult();
87 if (!resultImage)
88 return;
89
90 setIsAlphaImage(in->isAlphaImage());
91
92 FloatRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect());
93 Filter* filter = this->filter();
94 drawingRegion.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy));
95 resultImage->context()->drawImageBuffer(in->asImageBuffer(), ColorSpaceDeviceRGB, drawingRegion);
96 }
97
dump()98 void FEOffset::dump()
99 {
100 }
101
externalRepresentation(TextStream & ts,int indent) const102 TextStream& FEOffset::externalRepresentation(TextStream& ts, int indent) const
103 {
104 writeIndent(ts, indent);
105 ts << "[feOffset";
106 FilterEffect::externalRepresentation(ts);
107 ts << " dx=\"" << dx() << "\" dy=\"" << dy() << "\"]\n";
108 inputEffect(0)->externalRepresentation(ts, indent + 1);
109 return ts;
110 }
111
112 } // namespace WebCore
113
114 #endif // ENABLE(FILTERS)
115