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/GraphicsContext.h"
30 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
31 #include "platform/graphics/skia/NativeImageSkia.h"
32 #include "platform/text/TextStream.h"
33 #include "wtf/MathExtras.h"
34 #include "wtf/Uint8ClampedArray.h"
38 FEColorMatrix::FEColorMatrix(Filter* filter, ColorMatrixType type, const Vector<float>& values)
39 : FilterEffect(filter)
45 PassRefPtr<FEColorMatrix> FEColorMatrix::create(Filter* filter, ColorMatrixType type, const Vector<float>& values)
47 return adoptRef(new FEColorMatrix(filter, type, values));
50 ColorMatrixType FEColorMatrix::type() const
55 bool FEColorMatrix::setType(ColorMatrixType type)
63 const Vector<float>& FEColorMatrix::values() const
68 bool FEColorMatrix::setValues(const Vector<float> &values)
70 if (m_values == values)
76 static void saturateMatrix(float s, SkScalar matrix[20])
78 matrix[0] = 0.213f + 0.787f * s;
79 matrix[1] = 0.715f - 0.715f * s;
80 matrix[2] = 0.072f - 0.072f * s;
81 matrix[3] = matrix[4] = 0;
82 matrix[5] = 0.213f - 0.213f * s;
83 matrix[6] = 0.715f + 0.285f * s;
84 matrix[7] = 0.072f - 0.072f * s;
85 matrix[8] = matrix[9] = 0;
86 matrix[10] = 0.213f - 0.213f * s;
87 matrix[11] = 0.715f - 0.715f * s;
88 matrix[12] = 0.072f + 0.928f * s;
89 matrix[13] = matrix[14] = 0;
90 matrix[15] = matrix[16] = matrix[17] = 0;
95 static void hueRotateMatrix(float hue, SkScalar matrix[20])
97 float cosHue = cosf(hue * piFloat / 180);
98 float sinHue = sinf(hue * piFloat / 180);
99 matrix[0] = 0.213f + cosHue * 0.787f - sinHue * 0.213f;
100 matrix[1] = 0.715f - cosHue * 0.715f - sinHue * 0.715f;
101 matrix[2] = 0.072f - cosHue * 0.072f + sinHue * 0.928f;
102 matrix[3] = matrix[4] = 0;
103 matrix[5] = 0.213f - cosHue * 0.213f + sinHue * 0.143f;
104 matrix[6] = 0.715f + cosHue * 0.285f + sinHue * 0.140f;
105 matrix[7] = 0.072f - cosHue * 0.072f - sinHue * 0.283f;
106 matrix[8] = matrix[9] = 0;
107 matrix[10] = 0.213f - cosHue * 0.213f - sinHue * 0.787f;
108 matrix[11] = 0.715f - cosHue * 0.715f + sinHue * 0.715f;
109 matrix[12] = 0.072f + cosHue * 0.928f + sinHue * 0.072f;
110 matrix[13] = matrix[14] = 0;
111 matrix[15] = matrix[16] = matrix[17] = 0;
116 static void luminanceToAlphaMatrix(SkScalar matrix[20])
118 memset(matrix, 0, 20 * sizeof(SkScalar));
119 matrix[15] = 0.2125f;
120 matrix[16] = 0.7154f;
121 matrix[17] = 0.0721f;
124 static SkColorFilter* createColorFilter(ColorMatrixType type, const float* values)
128 case FECOLORMATRIX_TYPE_UNKNOWN:
130 case FECOLORMATRIX_TYPE_MATRIX:
131 for (int i = 0; i < 20; ++i)
132 matrix[i] = values[i];
134 matrix[4] *= SkScalar(255);
135 matrix[9] *= SkScalar(255);
136 matrix[14] *= SkScalar(255);
137 matrix[19] *= SkScalar(255);
139 case FECOLORMATRIX_TYPE_SATURATE:
140 saturateMatrix(values[0], matrix);
142 case FECOLORMATRIX_TYPE_HUEROTATE:
143 hueRotateMatrix(values[0], matrix);
145 case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
146 luminanceToAlphaMatrix(matrix);
149 return SkColorMatrixFilter::Create(matrix);
152 void FEColorMatrix::applySoftware()
154 ImageBuffer* resultImage = createImageBufferResult();
158 FilterEffect* in = inputEffect(0);
160 IntRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect());
162 SkAutoTUnref<SkColorFilter> filter(createColorFilter(m_type, m_values.data()));
164 RefPtr<Image> image = in->asImageBuffer()->copyImage(DontCopyBackingStore);
165 RefPtr<NativeImageSkia> nativeImage = image->nativeImageForCurrentFrame();
170 paint.setColorFilter(filter);
171 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
172 resultImage->context()->drawBitmap(nativeImage->bitmap(), drawingRegion.x(), drawingRegion.y(), &paint);
174 if (affectsTransparentPixels()) {
175 IntRect fullRect = IntRect(IntPoint(), absolutePaintRect().size());
176 resultImage->context()->clipOut(drawingRegion);
177 resultImage->context()->fillRect(fullRect, Color(m_values[4], m_values[9], m_values[14], m_values[19]));
182 bool FEColorMatrix::affectsTransparentPixels()
184 // Because the input pixels are premultiplied, the only way clear pixels can be
185 // painted is if the additive component for the alpha is not 0.
186 return m_type == FECOLORMATRIX_TYPE_MATRIX && m_values[19] > 0;
189 PassRefPtr<SkImageFilter> FEColorMatrix::createImageFilter(SkiaImageFilterBuilder* builder)
191 RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
192 SkAutoTUnref<SkColorFilter> filter(createColorFilter(m_type, m_values.data()));
193 SkImageFilter::CropRect rect = getCropRect(builder->cropOffset());
194 return adoptRef(SkColorFilterImageFilter::Create(filter, input.get(), &rect));
197 static TextStream& operator<<(TextStream& ts, const ColorMatrixType& type)
200 case FECOLORMATRIX_TYPE_UNKNOWN:
203 case FECOLORMATRIX_TYPE_MATRIX:
206 case FECOLORMATRIX_TYPE_SATURATE:
209 case FECOLORMATRIX_TYPE_HUEROTATE:
212 case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
213 ts << "LUMINANCETOALPHA";
219 TextStream& FEColorMatrix::externalRepresentation(TextStream& ts, int indent) const
221 writeIndent(ts, indent);
222 ts << "[feColorMatrix";
223 FilterEffect::externalRepresentation(ts);
224 ts << " type=\"" << m_type << "\"";
225 if (!m_values.isEmpty()) {
227 Vector<float>::const_iterator ptr = m_values.begin();
228 const Vector<float>::const_iterator end = m_values.end();
238 inputEffect(0)->externalRepresentation(ts, indent + 1);
242 } // namespace WebCore