| /* |
| * 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. |
| * Copyright (C) 2013 Google Inc. 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 "sky/engine/platform/graphics/filters/FEDisplacementMap.h" |
| |
| #include "sky/engine/platform/graphics/GraphicsContext.h" |
| #include "sky/engine/platform/graphics/filters/SkiaImageFilterBuilder.h" |
| #include "sky/engine/platform/graphics/skia/NativeImageSkia.h" |
| #include "sky/engine/platform/text/TextStream.h" |
| #include "sky/engine/wtf/Uint8ClampedArray.h" |
| #include "third_party/skia/include/effects/SkBitmapSource.h" |
| #include "third_party/skia/include/effects/SkDisplacementMapEffect.h" |
| |
| namespace blink { |
| |
| FEDisplacementMap::FEDisplacementMap(Filter* filter, ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, float scale) |
| : FilterEffect(filter) |
| , m_xChannelSelector(xChannelSelector) |
| , m_yChannelSelector(yChannelSelector) |
| , m_scale(scale) |
| { |
| } |
| |
| PassRefPtr<FEDisplacementMap> FEDisplacementMap::create(Filter* filter, ChannelSelectorType xChannelSelector, |
| ChannelSelectorType yChannelSelector, float scale) |
| { |
| return adoptRef(new FEDisplacementMap(filter, xChannelSelector, yChannelSelector, scale)); |
| } |
| |
| FloatRect FEDisplacementMap::mapPaintRect(const FloatRect& rect, bool) |
| { |
| FloatRect result = rect; |
| result.inflateX(filter()->applyHorizontalScale(m_scale / 2)); |
| result.inflateY(filter()->applyVerticalScale(m_scale / 2)); |
| return result; |
| } |
| |
| ChannelSelectorType FEDisplacementMap::xChannelSelector() const |
| { |
| return m_xChannelSelector; |
| } |
| |
| bool FEDisplacementMap::setXChannelSelector(const ChannelSelectorType xChannelSelector) |
| { |
| if (m_xChannelSelector == xChannelSelector) |
| return false; |
| m_xChannelSelector = xChannelSelector; |
| return true; |
| } |
| |
| ChannelSelectorType FEDisplacementMap::yChannelSelector() const |
| { |
| return m_yChannelSelector; |
| } |
| |
| bool FEDisplacementMap::setYChannelSelector(const ChannelSelectorType yChannelSelector) |
| { |
| if (m_yChannelSelector == yChannelSelector) |
| return false; |
| m_yChannelSelector = yChannelSelector; |
| return true; |
| } |
| |
| float FEDisplacementMap::scale() const |
| { |
| return m_scale; |
| } |
| |
| 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::applySoftware() |
| { |
| 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()); |
| RefPtr<Uint8ClampedArray> srcPixelArrayA = in->asPremultipliedImage(effectADrawingRect); |
| |
| IntRect effectBDrawingRect = requestedRegionOfInputImageData(in2->absolutePaintRect()); |
| RefPtr<Uint8ClampedArray> srcPixelArrayB = in2->asUnmultipliedImage(effectBDrawingRect); |
| |
| ASSERT(srcPixelArrayA->length() == srcPixelArrayB->length()); |
| |
| Filter* filter = this->filter(); |
| IntSize paintSize = absolutePaintRect().size(); |
| float scaleX = filter->applyHorizontalScale(m_scale); |
| float scaleY = filter->applyVerticalScale(m_scale); |
| float scaleForColorX = scaleX / 255.0; |
| float scaleForColorY = scaleY / 255.0; |
| float scaledOffsetX = 0.5 - scaleX * 0.5; |
| float scaledOffsetY = 0.5 - scaleY * 0.5; |
| int stride = paintSize.width() * 4; |
| for (int y = 0; y < paintSize.height(); ++y) { |
| int line = y * stride; |
| for (int x = 0; x < paintSize.width(); ++x) { |
| int dstIndex = line + x * 4; |
| int srcX = x + static_cast<int>(scaleForColorX * srcPixelArrayB->item(dstIndex + m_xChannelSelector - 1) + scaledOffsetX); |
| int srcY = y + static_cast<int>(scaleForColorY * srcPixelArrayB->item(dstIndex + m_yChannelSelector - 1) + scaledOffsetY); |
| for (unsigned channel = 0; channel < 4; ++channel) { |
| if (srcX < 0 || srcX >= paintSize.width() || srcY < 0 || srcY >= paintSize.height()) { |
| dstPixelArray->set(dstIndex + channel, static_cast<unsigned char>(0)); |
| } else { |
| unsigned char pixelValue = srcPixelArrayA->item(srcY * stride + srcX * 4 + channel); |
| dstPixelArray->set(dstIndex + channel, pixelValue); |
| } |
| } |
| } |
| } |
| } |
| |
| static SkDisplacementMapEffect::ChannelSelectorType toSkiaMode(ChannelSelectorType type) |
| { |
| switch (type) { |
| case CHANNEL_R: |
| return SkDisplacementMapEffect::kR_ChannelSelectorType; |
| case CHANNEL_G: |
| return SkDisplacementMapEffect::kG_ChannelSelectorType; |
| case CHANNEL_B: |
| return SkDisplacementMapEffect::kB_ChannelSelectorType; |
| case CHANNEL_A: |
| return SkDisplacementMapEffect::kA_ChannelSelectorType; |
| case CHANNEL_UNKNOWN: |
| default: |
| return SkDisplacementMapEffect::kUnknown_ChannelSelectorType; |
| } |
| } |
| |
| PassRefPtr<SkImageFilter> FEDisplacementMap::createImageFilter(SkiaImageFilterBuilder* builder) |
| { |
| RefPtr<SkImageFilter> color = builder->build(inputEffect(0), operatingColorSpace()); |
| RefPtr<SkImageFilter> displ = builder->build(inputEffect(1), operatingColorSpace()); |
| SkDisplacementMapEffect::ChannelSelectorType typeX = toSkiaMode(m_xChannelSelector); |
| SkDisplacementMapEffect::ChannelSelectorType typeY = toSkiaMode(m_yChannelSelector); |
| SkImageFilter::CropRect cropRect = getCropRect(builder->cropOffset()); |
| // FIXME : Only applyHorizontalScale is used and applyVerticalScale is ignored |
| // This can be fixed by adding a 2nd scale parameter to SkDisplacementMapEffect |
| return adoptRef(SkDisplacementMapEffect::Create(typeX, typeY, SkFloatToScalar(filter()->applyHorizontalScale(m_scale)), displ.get(), color.get(), &cropRect)); |
| } |
| |
| 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, int indent) const |
| { |
| writeIndent(ts, indent); |
| ts << "[feDisplacementMap"; |
| FilterEffect::externalRepresentation(ts); |
| ts << " scale=\"" << m_scale << "\" " |
| << "xChannelSelector=\"" << m_xChannelSelector << "\" " |
| << "yChannelSelector=\"" << m_yChannelSelector << "\"]\n"; |
| inputEffect(0)->externalRepresentation(ts, indent + 1); |
| inputEffect(1)->externalRepresentation(ts, indent + 1); |
| return ts; |
| } |
| |
| FloatRect FEDisplacementMap::determineAbsolutePaintRect(const FloatRect& requestedRect) |
| { |
| FloatRect rect = requestedRect; |
| if (clipsToBounds()) |
| rect.intersect(maxEffectRect()); |
| |
| if (absolutePaintRect().contains(enclosingIntRect(rect))) |
| return rect; |
| |
| rect = mapPaintRect(rect, false); |
| rect = inputEffect(0)->determineAbsolutePaintRect(rect); |
| rect = mapPaintRect(rect, true); |
| rect.intersect(requestedRect); |
| |
| addAbsolutePaintRect(rect); |
| return rect; |
| } |
| |
| } // namespace blink |