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 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #include "config.h"
24
25 #if ENABLE(FILTERS)
26 #include "FEColorMatrix.h"
27
28 #include "Filter.h"
29 #include "GraphicsContext.h"
30 #include "RenderTreeAsText.h"
31 #include "TextStream.h"
32
33 #include <wtf/ByteArray.h>
34 #include <wtf/MathExtras.h>
35
36 namespace WebCore {
37
FEColorMatrix(Filter * filter,ColorMatrixType type,const Vector<float> & values)38 FEColorMatrix::FEColorMatrix(Filter* filter, ColorMatrixType type, const Vector<float>& values)
39 : FilterEffect(filter)
40 , m_type(type)
41 , m_values(values)
42 {
43 }
44
create(Filter * filter,ColorMatrixType type,const Vector<float> & values)45 PassRefPtr<FEColorMatrix> FEColorMatrix::create(Filter* filter, ColorMatrixType type, const Vector<float>& values)
46 {
47 return adoptRef(new FEColorMatrix(filter, type, values));
48 }
49
type() const50 ColorMatrixType FEColorMatrix::type() const
51 {
52 return m_type;
53 }
54
setType(ColorMatrixType type)55 bool FEColorMatrix::setType(ColorMatrixType type)
56 {
57 if (m_type == type)
58 return false;
59 m_type = type;
60 return true;
61 }
62
values() const63 const Vector<float>& FEColorMatrix::values() const
64 {
65 return m_values;
66 }
67
setValues(const Vector<float> & values)68 bool FEColorMatrix::setValues(const Vector<float> &values)
69 {
70 if (m_values == values)
71 return false;
72 m_values = values;
73 return true;
74 }
75
matrix(double & red,double & green,double & blue,double & alpha,const Vector<float> & values)76 inline void matrix(double& red, double& green, double& blue, double& alpha, const Vector<float>& values)
77 {
78 double r = values[0] * red + values[1] * green + values[2] * blue + values[3] * alpha + values[4] * 255;
79 double g = values[5] * red + values[6] * green + values[7] * blue + values[8] * alpha + values[9] * 255;
80 double b = values[10] * red + values[11] * green + values[12] * blue + values[13] * alpha + values[14] * 255;
81 double a = values[15] * red + values[16] * green + values[17] * blue + values[18] * alpha + values[19] * 255;
82
83 red = r;
84 green = g;
85 blue = b;
86 alpha = a;
87 }
88
saturate(double & red,double & green,double & blue,const float & s)89 inline void saturate(double& red, double& green, double& blue, const float& s)
90 {
91 double r = (0.213 + 0.787 * s) * red + (0.715 - 0.715 * s) * green + (0.072 - 0.072 * s) * blue;
92 double g = (0.213 - 0.213 * s) * red + (0.715 + 0.285 * s) * green + (0.072 - 0.072 * s) * blue;
93 double b = (0.213 - 0.213 * s) * red + (0.715 - 0.715 * s) * green + (0.072 + 0.928 * s) * blue;
94
95 red = r;
96 green = g;
97 blue = b;
98 }
99
huerotate(double & red,double & green,double & blue,const float & hue)100 inline void huerotate(double& red, double& green, double& blue, const float& hue)
101 {
102 double cosHue = cos(hue * piDouble / 180);
103 double sinHue = sin(hue * piDouble / 180);
104 double r = red * (0.213 + cosHue * 0.787 - sinHue * 0.213) +
105 green * (0.715 - cosHue * 0.715 - sinHue * 0.715) +
106 blue * (0.072 - cosHue * 0.072 + sinHue * 0.928);
107 double g = red * (0.213 - cosHue * 0.213 + sinHue * 0.143) +
108 green * (0.715 + cosHue * 0.285 + sinHue * 0.140) +
109 blue * (0.072 - cosHue * 0.072 - sinHue * 0.283);
110 double b = red * (0.213 - cosHue * 0.213 - sinHue * 0.787) +
111 green * (0.715 - cosHue * 0.715 + sinHue * 0.715) +
112 blue * (0.072 + cosHue * 0.928 + sinHue * 0.072);
113
114 red = r;
115 green = g;
116 blue = b;
117 }
118
luminance(double & red,double & green,double & blue,double & alpha)119 inline void luminance(double& red, double& green, double& blue, double& alpha)
120 {
121 alpha = 0.2125 * red + 0.7154 * green + 0.0721 * blue;
122 red = 0;
123 green = 0;
124 blue = 0;
125 }
126
127 template<ColorMatrixType filterType>
effectType(ByteArray * pixelArray,const Vector<float> & values)128 void effectType(ByteArray* pixelArray, const Vector<float>& values)
129 {
130 unsigned pixelArrayLength = pixelArray->length();
131 for (unsigned pixelByteOffset = 0; pixelByteOffset < pixelArrayLength; pixelByteOffset += 4) {
132 double red = pixelArray->get(pixelByteOffset);
133 double green = pixelArray->get(pixelByteOffset + 1);
134 double blue = pixelArray->get(pixelByteOffset + 2);
135 double alpha = pixelArray->get(pixelByteOffset + 3);
136
137 switch (filterType) {
138 case FECOLORMATRIX_TYPE_MATRIX:
139 matrix(red, green, blue, alpha, values);
140 break;
141 case FECOLORMATRIX_TYPE_SATURATE:
142 saturate(red, green, blue, values[0]);
143 break;
144 case FECOLORMATRIX_TYPE_HUEROTATE:
145 huerotate(red, green, blue, values[0]);
146 break;
147 case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
148 luminance(red, green, blue, alpha);
149 break;
150 }
151
152 pixelArray->set(pixelByteOffset, red);
153 pixelArray->set(pixelByteOffset + 1, green);
154 pixelArray->set(pixelByteOffset + 2, blue);
155 pixelArray->set(pixelByteOffset + 3, alpha);
156 }
157 }
158
apply()159 void FEColorMatrix::apply()
160 {
161 if (hasResult())
162 return;
163 FilterEffect* in = inputEffect(0);
164 in->apply();
165 if (!in->hasResult())
166 return;
167
168 ImageBuffer* resultImage = createImageBufferResult();
169 if (!resultImage)
170 return;
171
172 resultImage->context()->drawImageBuffer(in->asImageBuffer(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in->absolutePaintRect()));
173
174 IntRect imageRect(IntPoint(), absolutePaintRect().size());
175 RefPtr<ByteArray> pixelArray = resultImage->getUnmultipliedImageData(imageRect);
176
177 switch (m_type) {
178 case FECOLORMATRIX_TYPE_UNKNOWN:
179 break;
180 case FECOLORMATRIX_TYPE_MATRIX:
181 effectType<FECOLORMATRIX_TYPE_MATRIX>(pixelArray.get(), m_values);
182 break;
183 case FECOLORMATRIX_TYPE_SATURATE:
184 effectType<FECOLORMATRIX_TYPE_SATURATE>(pixelArray.get(), m_values);
185 break;
186 case FECOLORMATRIX_TYPE_HUEROTATE:
187 effectType<FECOLORMATRIX_TYPE_HUEROTATE>(pixelArray.get(), m_values);
188 break;
189 case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
190 effectType<FECOLORMATRIX_TYPE_LUMINANCETOALPHA>(pixelArray.get(), m_values);
191 setIsAlphaImage(true);
192 break;
193 }
194
195 resultImage->putUnmultipliedImageData(pixelArray.get(), imageRect.size(), imageRect, IntPoint());
196 }
197
dump()198 void FEColorMatrix::dump()
199 {
200 }
201
operator <<(TextStream & ts,const ColorMatrixType & type)202 static TextStream& operator<<(TextStream& ts, const ColorMatrixType& type)
203 {
204 switch (type) {
205 case FECOLORMATRIX_TYPE_UNKNOWN:
206 ts << "UNKNOWN";
207 break;
208 case FECOLORMATRIX_TYPE_MATRIX:
209 ts << "MATRIX";
210 break;
211 case FECOLORMATRIX_TYPE_SATURATE:
212 ts << "SATURATE";
213 break;
214 case FECOLORMATRIX_TYPE_HUEROTATE:
215 ts << "HUEROTATE";
216 break;
217 case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
218 ts << "LUMINANCETOALPHA";
219 break;
220 }
221 return ts;
222 }
223
externalRepresentation(TextStream & ts,int indent) const224 TextStream& FEColorMatrix::externalRepresentation(TextStream& ts, int indent) const
225 {
226 writeIndent(ts, indent);
227 ts << "[feColorMatrix";
228 FilterEffect::externalRepresentation(ts);
229 ts << " type=\"" << m_type << "\"";
230 if (!m_values.isEmpty()) {
231 ts << " values=\"";
232 Vector<float>::const_iterator ptr = m_values.begin();
233 const Vector<float>::const_iterator end = m_values.end();
234 while (ptr < end) {
235 ts << *ptr;
236 ++ptr;
237 if (ptr < end)
238 ts << " ";
239 }
240 ts << "\"";
241 }
242 ts << "]\n";
243 inputEffect(0)->externalRepresentation(ts, indent + 1);
244 return ts;
245 }
246
247 } // namespace WebCore
248
249 #endif // ENABLE(FILTERS)
250