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 * Copyright (C) 2013 Google Inc. All rights reserved.
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public License
20 * along with this library; see the file COPYING.LIB. If not, write to
21 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
26 #include "platform/graphics/filters/FEDisplacementMap.h"
28 #include "SkDisplacementMapEffect.h"
29 #include "platform/graphics/filters/Filter.h"
30 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
31 #include "platform/text/TextStream.h"
35 FEDisplacementMap::FEDisplacementMap(Filter* filter, ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, float scale)
36 : FilterEffect(filter)
37 , m_xChannelSelector(xChannelSelector)
38 , m_yChannelSelector(yChannelSelector)
43 PassRefPtr<FEDisplacementMap> FEDisplacementMap::create(Filter* filter, ChannelSelectorType xChannelSelector,
44 ChannelSelectorType yChannelSelector, float scale)
46 return adoptRef(new FEDisplacementMap(filter, xChannelSelector, yChannelSelector, scale));
49 FloatRect FEDisplacementMap::mapPaintRect(const FloatRect& rect, bool)
51 FloatRect result = rect;
52 result.inflateX(filter()->applyHorizontalScale(m_scale / 2));
53 result.inflateY(filter()->applyVerticalScale(m_scale / 2));
57 ChannelSelectorType FEDisplacementMap::xChannelSelector() const
59 return m_xChannelSelector;
62 bool FEDisplacementMap::setXChannelSelector(const ChannelSelectorType xChannelSelector)
64 if (m_xChannelSelector == xChannelSelector)
66 m_xChannelSelector = xChannelSelector;
70 ChannelSelectorType FEDisplacementMap::yChannelSelector() const
72 return m_yChannelSelector;
75 bool FEDisplacementMap::setYChannelSelector(const ChannelSelectorType yChannelSelector)
77 if (m_yChannelSelector == yChannelSelector)
79 m_yChannelSelector = yChannelSelector;
83 float FEDisplacementMap::scale() const
88 bool FEDisplacementMap::setScale(float scale)
96 void FEDisplacementMap::setResultColorSpace(ColorSpace)
98 // Spec: The 'color-interpolation-filters' property only applies to the 'in2' source image
99 // and does not apply to the 'in' source image. The 'in' source image must remain in its
100 // current color space.
101 // The result is in that smae color space because it is a displacement of the 'in' image.
102 FilterEffect::setResultColorSpace(inputEffect(0)->resultColorSpace());
105 static SkDisplacementMapEffect::ChannelSelectorType toSkiaMode(ChannelSelectorType type)
109 return SkDisplacementMapEffect::kR_ChannelSelectorType;
111 return SkDisplacementMapEffect::kG_ChannelSelectorType;
113 return SkDisplacementMapEffect::kB_ChannelSelectorType;
115 return SkDisplacementMapEffect::kA_ChannelSelectorType;
116 case CHANNEL_UNKNOWN:
118 return SkDisplacementMapEffect::kUnknown_ChannelSelectorType;
122 PassRefPtr<SkImageFilter> FEDisplacementMap::createImageFilter(SkiaImageFilterBuilder* builder)
124 RefPtr<SkImageFilter> color = builder->build(inputEffect(0), operatingColorSpace());
125 RefPtr<SkImageFilter> displ = builder->build(inputEffect(1), operatingColorSpace());
126 SkDisplacementMapEffect::ChannelSelectorType typeX = toSkiaMode(m_xChannelSelector);
127 SkDisplacementMapEffect::ChannelSelectorType typeY = toSkiaMode(m_yChannelSelector);
128 SkImageFilter::CropRect cropRect = getCropRect(builder->cropOffset());
129 // FIXME : Only applyHorizontalScale is used and applyVerticalScale is ignored
130 // This can be fixed by adding a 2nd scale parameter to SkDisplacementMapEffect
131 return adoptRef(SkDisplacementMapEffect::Create(typeX, typeY, SkFloatToScalar(filter()->applyHorizontalScale(m_scale)), displ.get(), color.get(), &cropRect));
134 static TextStream& operator<<(TextStream& ts, const ChannelSelectorType& type)
137 case CHANNEL_UNKNOWN:
156 TextStream& FEDisplacementMap::externalRepresentation(TextStream& ts, int indent) const
158 writeIndent(ts, indent);
159 ts << "[feDisplacementMap";
160 FilterEffect::externalRepresentation(ts);
161 ts << " scale=\"" << m_scale << "\" "
162 << "xChannelSelector=\"" << m_xChannelSelector << "\" "
163 << "yChannelSelector=\"" << m_yChannelSelector << "\"]\n";
164 inputEffect(0)->externalRepresentation(ts, indent + 1);
165 inputEffect(1)->externalRepresentation(ts, indent + 1);
169 FloatRect FEDisplacementMap::determineAbsolutePaintRect(const FloatRect& requestedRect)
171 FloatRect rect = requestedRect;
173 rect.intersect(maxEffectRect());
175 if (absolutePaintRect().contains(enclosingIntRect(rect)))
178 rect = mapPaintRect(rect, false);
179 rect = inputEffect(0)->determineAbsolutePaintRect(rect);
180 rect = mapPaintRect(rect, true);
181 rect.intersect(requestedRect);
183 addAbsolutePaintRect(rect);