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) 2013 Google Inc. All rights reserved.
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.
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.
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.
25 #include "platform/graphics/filters/FEColorMatrix.h"
27 #include "SkColorFilterImageFilter.h"
28 #include "SkColorMatrixFilter.h"
29 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
30 #include "platform/text/TextStream.h"
34 FEColorMatrix::FEColorMatrix(Filter* filter, ColorMatrixType type, const Vector<float>& values)
35 : FilterEffect(filter)
41 PassRefPtr<FEColorMatrix> FEColorMatrix::create(Filter* filter, ColorMatrixType type, const Vector<float>& values)
43 return adoptRef(new FEColorMatrix(filter, type, values));
46 ColorMatrixType FEColorMatrix::type() const
51 bool FEColorMatrix::setType(ColorMatrixType type)
59 const Vector<float>& FEColorMatrix::values() const
64 bool FEColorMatrix::setValues(const Vector<float> &values)
66 if (m_values == values)
72 static void saturateMatrix(float s, SkScalar matrix[20])
74 matrix[0] = 0.213f + 0.787f * s;
75 matrix[1] = 0.715f - 0.715f * s;
76 matrix[2] = 0.072f - 0.072f * s;
77 matrix[3] = matrix[4] = 0;
78 matrix[5] = 0.213f - 0.213f * s;
79 matrix[6] = 0.715f + 0.285f * s;
80 matrix[7] = 0.072f - 0.072f * s;
81 matrix[8] = matrix[9] = 0;
82 matrix[10] = 0.213f - 0.213f * s;
83 matrix[11] = 0.715f - 0.715f * s;
84 matrix[12] = 0.072f + 0.928f * s;
85 matrix[13] = matrix[14] = 0;
86 matrix[15] = matrix[16] = matrix[17] = 0;
91 static void hueRotateMatrix(float hue, SkScalar matrix[20])
93 float cosHue = cosf(hue * piFloat / 180);
94 float sinHue = sinf(hue * piFloat / 180);
95 matrix[0] = 0.213f + cosHue * 0.787f - sinHue * 0.213f;
96 matrix[1] = 0.715f - cosHue * 0.715f - sinHue * 0.715f;
97 matrix[2] = 0.072f - cosHue * 0.072f + sinHue * 0.928f;
98 matrix[3] = matrix[4] = 0;
99 matrix[5] = 0.213f - cosHue * 0.213f + sinHue * 0.143f;
100 matrix[6] = 0.715f + cosHue * 0.285f + sinHue * 0.140f;
101 matrix[7] = 0.072f - cosHue * 0.072f - sinHue * 0.283f;
102 matrix[8] = matrix[9] = 0;
103 matrix[10] = 0.213f - cosHue * 0.213f - sinHue * 0.787f;
104 matrix[11] = 0.715f - cosHue * 0.715f + sinHue * 0.715f;
105 matrix[12] = 0.072f + cosHue * 0.928f + sinHue * 0.072f;
106 matrix[13] = matrix[14] = 0;
107 matrix[15] = matrix[16] = matrix[17] = 0;
112 static void luminanceToAlphaMatrix(SkScalar matrix[20])
114 memset(matrix, 0, 20 * sizeof(SkScalar));
115 matrix[15] = 0.2125f;
116 matrix[16] = 0.7154f;
117 matrix[17] = 0.0721f;
120 static SkColorFilter* createColorFilter(ColorMatrixType type, const float* values)
124 case FECOLORMATRIX_TYPE_UNKNOWN:
126 case FECOLORMATRIX_TYPE_MATRIX:
127 for (int i = 0; i < 20; ++i)
128 matrix[i] = values[i];
130 matrix[4] *= SkScalar(255);
131 matrix[9] *= SkScalar(255);
132 matrix[14] *= SkScalar(255);
133 matrix[19] *= SkScalar(255);
135 case FECOLORMATRIX_TYPE_SATURATE:
136 saturateMatrix(values[0], matrix);
138 case FECOLORMATRIX_TYPE_HUEROTATE:
139 hueRotateMatrix(values[0], matrix);
141 case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
142 luminanceToAlphaMatrix(matrix);
145 return SkColorMatrixFilter::Create(matrix);
148 bool FEColorMatrix::affectsTransparentPixels()
150 // Because the input pixels are premultiplied, the only way clear pixels can be
151 // painted is if the additive component for the alpha is not 0.
152 return m_type == FECOLORMATRIX_TYPE_MATRIX && m_values[19] > 0;
155 PassRefPtr<SkImageFilter> FEColorMatrix::createImageFilter(SkiaImageFilterBuilder* builder)
157 RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
158 SkAutoTUnref<SkColorFilter> filter(createColorFilter(m_type, m_values.data()));
159 SkImageFilter::CropRect rect = getCropRect(builder->cropOffset());
160 return adoptRef(SkColorFilterImageFilter::Create(filter, input.get(), &rect));
163 static TextStream& operator<<(TextStream& ts, const ColorMatrixType& type)
166 case FECOLORMATRIX_TYPE_UNKNOWN:
169 case FECOLORMATRIX_TYPE_MATRIX:
172 case FECOLORMATRIX_TYPE_SATURATE:
175 case FECOLORMATRIX_TYPE_HUEROTATE:
178 case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
179 ts << "LUMINANCETOALPHA";
185 TextStream& FEColorMatrix::externalRepresentation(TextStream& ts, int indent) const
187 writeIndent(ts, indent);
188 ts << "[feColorMatrix";
189 FilterEffect::externalRepresentation(ts);
190 ts << " type=\"" << m_type << "\"";
191 if (!m_values.isEmpty()) {
193 Vector<float>::const_iterator ptr = m_values.begin();
194 const Vector<float>::const_iterator end = m_values.end();
204 inputEffect(0)->externalRepresentation(ts, indent + 1);