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 "FEDisplacementMap.h"
28
29 #include "Filter.h"
30 #include "GraphicsContext.h"
31 #include "RenderTreeAsText.h"
32 #include "TextStream.h"
33
34 #include <wtf/ByteArray.h>
35
36 namespace WebCore {
37
FEDisplacementMap(Filter * filter,ChannelSelectorType xChannelSelector,ChannelSelectorType yChannelSelector,float scale)38 FEDisplacementMap::FEDisplacementMap(Filter* filter, ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, float scale)
39 : FilterEffect(filter)
40 , m_xChannelSelector(xChannelSelector)
41 , m_yChannelSelector(yChannelSelector)
42 , m_scale(scale)
43 {
44 }
45
create(Filter * filter,ChannelSelectorType xChannelSelector,ChannelSelectorType yChannelSelector,float scale)46 PassRefPtr<FEDisplacementMap> FEDisplacementMap::create(Filter* filter, ChannelSelectorType xChannelSelector,
47 ChannelSelectorType yChannelSelector, float scale)
48 {
49 return adoptRef(new FEDisplacementMap(filter, xChannelSelector, yChannelSelector, scale));
50 }
51
xChannelSelector() const52 ChannelSelectorType FEDisplacementMap::xChannelSelector() const
53 {
54 return m_xChannelSelector;
55 }
56
setXChannelSelector(const ChannelSelectorType xChannelSelector)57 bool FEDisplacementMap::setXChannelSelector(const ChannelSelectorType xChannelSelector)
58 {
59 if (m_xChannelSelector == xChannelSelector)
60 return false;
61 m_xChannelSelector = xChannelSelector;
62 return true;
63 }
64
yChannelSelector() const65 ChannelSelectorType FEDisplacementMap::yChannelSelector() const
66 {
67 return m_yChannelSelector;
68 }
69
setYChannelSelector(const ChannelSelectorType yChannelSelector)70 bool FEDisplacementMap::setYChannelSelector(const ChannelSelectorType yChannelSelector)
71 {
72 if (m_yChannelSelector == yChannelSelector)
73 return false;
74 m_yChannelSelector = yChannelSelector;
75 return true;
76 }
77
scale() const78 float FEDisplacementMap::scale() const
79 {
80 return m_scale;
81 }
82
setScale(float scale)83 bool FEDisplacementMap::setScale(float scale)
84 {
85 if (m_scale == scale)
86 return false;
87 m_scale = scale;
88 return true;
89 }
90
apply()91 void FEDisplacementMap::apply()
92 {
93 if (hasResult())
94 return;
95 FilterEffect* in = inputEffect(0);
96 FilterEffect* in2 = inputEffect(1);
97 in->apply();
98 in2->apply();
99 if (!in->hasResult() || !in2->hasResult())
100 return;
101
102 if (m_xChannelSelector == CHANNEL_UNKNOWN || m_yChannelSelector == CHANNEL_UNKNOWN)
103 return;
104
105 ByteArray* dstPixelArray = createPremultipliedImageResult();
106 if (!dstPixelArray)
107 return;
108
109 IntRect effectADrawingRect = requestedRegionOfInputImageData(in->absolutePaintRect());
110 RefPtr<ByteArray> srcPixelArrayA = in->asPremultipliedImage(effectADrawingRect);
111
112 IntRect effectBDrawingRect = requestedRegionOfInputImageData(in2->absolutePaintRect());
113 RefPtr<ByteArray> srcPixelArrayB = in2->asUnmultipliedImage(effectBDrawingRect);
114
115 ASSERT(srcPixelArrayA->length() == srcPixelArrayB->length());
116
117 Filter* filter = this->filter();
118 IntSize paintSize = absolutePaintRect().size();
119 float scaleX = filter->applyHorizontalScale(m_scale / 255);
120 float scaleY = filter->applyVerticalScale(m_scale / 255);
121 float scaleAdjustmentX = filter->applyHorizontalScale(0.5f - 0.5f * m_scale);
122 float scaleAdjustmentY = filter->applyVerticalScale(0.5f - 0.5f * m_scale);
123 int stride = paintSize.width() * 4;
124 for (int y = 0; y < paintSize.height(); ++y) {
125 int line = y * stride;
126 for (int x = 0; x < paintSize.width(); ++x) {
127 int dstIndex = line + x * 4;
128 int srcX = x + static_cast<int>(scaleX * srcPixelArrayB->get(dstIndex + m_xChannelSelector - 1) + scaleAdjustmentX);
129 int srcY = y + static_cast<int>(scaleY * srcPixelArrayB->get(dstIndex + m_yChannelSelector - 1) + scaleAdjustmentY);
130 for (unsigned channel = 0; channel < 4; ++channel) {
131 if (srcX < 0 || srcX >= paintSize.width() || srcY < 0 || srcY >= paintSize.height())
132 dstPixelArray->set(dstIndex + channel, static_cast<unsigned char>(0));
133 else {
134 unsigned char pixelValue = srcPixelArrayA->get(srcY * stride + srcX * 4 + channel);
135 dstPixelArray->set(dstIndex + channel, pixelValue);
136 }
137 }
138 }
139 }
140 }
141
dump()142 void FEDisplacementMap::dump()
143 {
144 }
145
operator <<(TextStream & ts,const ChannelSelectorType & type)146 static TextStream& operator<<(TextStream& ts, const ChannelSelectorType& type)
147 {
148 switch (type) {
149 case CHANNEL_UNKNOWN:
150 ts << "UNKNOWN";
151 break;
152 case CHANNEL_R:
153 ts << "RED";
154 break;
155 case CHANNEL_G:
156 ts << "GREEN";
157 break;
158 case CHANNEL_B:
159 ts << "BLUE";
160 break;
161 case CHANNEL_A:
162 ts << "ALPHA";
163 break;
164 }
165 return ts;
166 }
167
externalRepresentation(TextStream & ts,int indent) const168 TextStream& FEDisplacementMap::externalRepresentation(TextStream& ts, int indent) const
169 {
170 writeIndent(ts, indent);
171 ts << "[feDisplacementMap";
172 FilterEffect::externalRepresentation(ts);
173 ts << " scale=\"" << m_scale << "\" "
174 << "xChannelSelector=\"" << m_xChannelSelector << "\" "
175 << "yChannelSelector=\"" << m_yChannelSelector << "\"]\n";
176 inputEffect(0)->externalRepresentation(ts, indent + 1);
177 inputEffect(1)->externalRepresentation(ts, indent + 1);
178 return ts;
179 }
180
181 } // namespace WebCore
182
183 #endif // ENABLE(FILTERS)
184