| /* |
| * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org> |
| * Copyright (C) 2005 Eric Seidel <eric@webkit.org> |
| * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> |
| * Copyright (C) Research In Motion Limited 2010. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| #include "FEDisplacementMap.h" |
| |
| #include "ColorUtilities.h" |
| #include "Filter.h" |
| #include "GraphicsContext.h" |
| #include <JavaScriptCore/Uint8ClampedArray.h> |
| #include <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| FEDisplacementMap::FEDisplacementMap(Filter& filter, ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, float scale) |
| : FilterEffect(filter) |
| , m_xChannelSelector(xChannelSelector) |
| , m_yChannelSelector(yChannelSelector) |
| , m_scale(scale) |
| { |
| } |
| |
| Ref<FEDisplacementMap> FEDisplacementMap::create(Filter& filter, ChannelSelectorType xChannelSelector, |
| ChannelSelectorType yChannelSelector, float scale) |
| { |
| return adoptRef(*new FEDisplacementMap(filter, xChannelSelector, yChannelSelector, scale)); |
| } |
| |
| bool FEDisplacementMap::setXChannelSelector(const ChannelSelectorType xChannelSelector) |
| { |
| if (m_xChannelSelector == xChannelSelector) |
| return false; |
| m_xChannelSelector = xChannelSelector; |
| return true; |
| } |
| |
| bool FEDisplacementMap::setYChannelSelector(const ChannelSelectorType yChannelSelector) |
| { |
| if (m_yChannelSelector == yChannelSelector) |
| return false; |
| m_yChannelSelector = yChannelSelector; |
| return true; |
| } |
| |
| bool FEDisplacementMap::setScale(float scale) |
| { |
| if (m_scale == scale) |
| return false; |
| m_scale = scale; |
| return true; |
| } |
| |
| void FEDisplacementMap::setResultColorSpace(ColorSpace) |
| { |
| // Spec: The 'color-interpolation-filters' property only applies to the 'in2' source image |
| // and does not apply to the 'in' source image. The 'in' source image must remain in its |
| // current color space. |
| // The result is in that smae color space because it is a displacement of the 'in' image. |
| FilterEffect::setResultColorSpace(inputEffect(0)->resultColorSpace()); |
| } |
| |
| void FEDisplacementMap::transformResultColorSpace(FilterEffect* in, const int index) |
| { |
| // Do not transform the first primitive input, as per the spec. |
| if (index) |
| in->transformResultColorSpace(operatingColorSpace()); |
| } |
| |
| void FEDisplacementMap::platformApplySoftware() |
| { |
| FilterEffect* in = inputEffect(0); |
| FilterEffect* in2 = inputEffect(1); |
| |
| ASSERT(m_xChannelSelector != CHANNEL_UNKNOWN); |
| ASSERT(m_yChannelSelector != CHANNEL_UNKNOWN); |
| |
| Uint8ClampedArray* dstPixelArray = createPremultipliedImageResult(); |
| if (!dstPixelArray) |
| return; |
| |
| IntRect effectADrawingRect = requestedRegionOfInputImageData(in->absolutePaintRect()); |
| auto inputImage = in->premultipliedResult(effectADrawingRect); |
| |
| IntRect effectBDrawingRect = requestedRegionOfInputImageData(in2->absolutePaintRect()); |
| // The calculations using the pixel values from ‘in2’ are performed using non-premultiplied color values. |
| auto displacementImage = in2->unmultipliedResult(effectBDrawingRect); |
| |
| if (!inputImage || !displacementImage) |
| return; |
| |
| ASSERT(inputImage->length() == displacementImage->length()); |
| |
| Filter& filter = this->filter(); |
| IntSize paintSize = absolutePaintRect().size(); |
| paintSize.scale(filter.filterScale()); |
| |
| FloatSize scale = filter.scaledByFilterResolution({ m_scale, m_scale }); |
| float scaleForColorX = scale.width() / 255.0; |
| float scaleForColorY = scale.height() / 255.0; |
| float scaledOffsetX = 0.5 - scale.width() * 0.5; |
| float scaledOffsetY = 0.5 - scale.height() * 0.5; |
| |
| int displacementChannelX = xChannelIndex(); |
| int displacementChannelY = yChannelIndex(); |
| |
| int rowBytes = paintSize.width() * 4; |
| |
| for (int y = 0; y < paintSize.height(); ++y) { |
| int lineStartOffset = y * rowBytes; |
| |
| for (int x = 0; x < paintSize.width(); ++x) { |
| int dstIndex = lineStartOffset + x * 4; |
| |
| int srcX = x + static_cast<int>(scaleForColorX * displacementImage->item(dstIndex + displacementChannelX) + scaledOffsetX); |
| int srcY = y + static_cast<int>(scaleForColorY * displacementImage->item(dstIndex + displacementChannelY) + scaledOffsetY); |
| |
| unsigned* dstPixelPtr = reinterpret_cast<unsigned*>(dstPixelArray->data() + dstIndex); |
| if (srcX < 0 || srcX >= paintSize.width() || srcY < 0 || srcY >= paintSize.height()) { |
| *dstPixelPtr = 0; |
| continue; |
| } |
| |
| *dstPixelPtr = *reinterpret_cast<unsigned*>(inputImage->data() + byteOffsetOfPixel(srcX, srcY, rowBytes)); |
| } |
| } |
| } |
| |
| static TextStream& operator<<(TextStream& ts, const ChannelSelectorType& type) |
| { |
| switch (type) { |
| case CHANNEL_UNKNOWN: |
| ts << "UNKNOWN"; |
| break; |
| case CHANNEL_R: |
| ts << "RED"; |
| break; |
| case CHANNEL_G: |
| ts << "GREEN"; |
| break; |
| case CHANNEL_B: |
| ts << "BLUE"; |
| break; |
| case CHANNEL_A: |
| ts << "ALPHA"; |
| break; |
| } |
| return ts; |
| } |
| |
| TextStream& FEDisplacementMap::externalRepresentation(TextStream& ts, RepresentationType representation) const |
| { |
| ts << indent << "[feDisplacementMap"; |
| FilterEffect::externalRepresentation(ts, representation); |
| ts << " scale=\"" << m_scale << "\" " |
| << "xChannelSelector=\"" << m_xChannelSelector << "\" " |
| << "yChannelSelector=\"" << m_yChannelSelector << "\"]\n"; |
| |
| TextStream::IndentScope indentScope(ts); |
| inputEffect(0)->externalRepresentation(ts, representation); |
| inputEffect(1)->externalRepresentation(ts, representation); |
| return ts; |
| } |
| |
| } // namespace WebCore |