| /* |
| * Copyright (C) Research In Motion Limited 2011. 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 "config.h" |
| #include "platform/graphics/filters/FEDropShadow.h" |
| |
| #include "platform/graphics/GraphicsContext.h" |
| #include "platform/graphics/filters/FEGaussianBlur.h" |
| #include "platform/graphics/filters/SkiaImageFilterBuilder.h" |
| #include "platform/text/TextStream.h" |
| #include "third_party/skia/include/core/SkColorFilter.h" |
| #include "third_party/skia/include/effects/SkBlurImageFilter.h" |
| #include "third_party/skia/include/effects/SkDropShadowImageFilter.h" |
| |
| using namespace std; |
| |
| namespace WebCore { |
| |
| FEDropShadow::FEDropShadow(Filter* filter, float stdX, float stdY, float dx, float dy, const Color& shadowColor, float shadowOpacity) |
| : FilterEffect(filter) |
| , m_stdX(stdX) |
| , m_stdY(stdY) |
| , m_dx(dx) |
| , m_dy(dy) |
| , m_shadowColor(shadowColor) |
| , m_shadowOpacity(shadowOpacity) |
| { |
| } |
| |
| PassRefPtr<FEDropShadow> FEDropShadow::create(Filter* filter, float stdX, float stdY, float dx, float dy, const Color& shadowColor, float shadowOpacity) |
| { |
| return adoptRef(new FEDropShadow(filter, stdX, stdY, dx, dy, shadowColor, shadowOpacity)); |
| } |
| |
| void FEDropShadow::determineAbsolutePaintRect() |
| { |
| Filter* filter = this->filter(); |
| ASSERT_UNUSED(filter, filter); |
| |
| FloatRect absolutePaintRect = mapRect(inputEffect(0)->absolutePaintRect()); |
| |
| if (clipsToBounds()) |
| absolutePaintRect.intersect(maxEffectRect()); |
| else |
| absolutePaintRect.unite(maxEffectRect()); |
| |
| setAbsolutePaintRect(enclosingIntRect(absolutePaintRect)); |
| } |
| |
| FloatRect FEDropShadow::mapRect(const FloatRect& rect, bool forward) |
| { |
| FloatRect result = rect; |
| Filter* filter = this->filter(); |
| ASSERT(filter); |
| |
| FloatRect offsetRect = rect; |
| if (forward) |
| offsetRect.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy)); |
| else |
| offsetRect.move(-filter->applyHorizontalScale(m_dx), -filter->applyVerticalScale(m_dy)); |
| result.unite(offsetRect); |
| |
| unsigned kernelSizeX = 0; |
| unsigned kernelSizeY = 0; |
| FEGaussianBlur::calculateKernelSize(filter, kernelSizeX, kernelSizeY, m_stdX, m_stdY); |
| |
| // We take the half kernel size and multiply it with three, because we run box blur three times. |
| result.inflateX(3 * kernelSizeX * 0.5f); |
| result.inflateY(3 * kernelSizeY * 0.5f); |
| return result; |
| } |
| |
| void FEDropShadow::applySoftware() |
| { |
| FilterEffect* in = inputEffect(0); |
| |
| ImageBuffer* resultImage = createImageBufferResult(); |
| if (!resultImage) |
| return; |
| |
| Filter* filter = this->filter(); |
| FloatSize blurRadius(filter->applyHorizontalScale(m_stdX), filter->applyVerticalScale(m_stdY)); |
| FloatSize offset(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy)); |
| |
| FloatRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect()); |
| GraphicsContext* resultContext = resultImage->context(); |
| ASSERT(resultContext); |
| |
| SkAutoTUnref<SkImageFilter> blurFilter(new SkBlurImageFilter(blurRadius.width(), blurRadius.height())); |
| SkAutoTUnref<SkColorFilter> colorFilter(SkColorFilter::CreateModeFilter(m_shadowColor.rgb(), SkXfermode::kSrcIn_Mode)); |
| SkPaint paint; |
| paint.setImageFilter(blurFilter.get()); |
| paint.setColorFilter(colorFilter.get()); |
| paint.setXfermodeMode(SkXfermode::kSrcOver_Mode); |
| RefPtr<Image> image = in->asImageBuffer()->copyImage(DontCopyBackingStore); |
| |
| RefPtr<NativeImageSkia> nativeImage = image->nativeImageForCurrentFrame(); |
| |
| if (!nativeImage) |
| return; |
| |
| resultContext->drawBitmap(nativeImage->bitmap(), drawingRegion.x() + offset.width(), drawingRegion.y() + offset.height(), &paint); |
| resultContext->drawBitmap(nativeImage->bitmap(), drawingRegion.x(), drawingRegion.y()); |
| } |
| |
| PassRefPtr<SkImageFilter> FEDropShadow::createImageFilter(SkiaImageFilterBuilder* builder) |
| { |
| RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace())); |
| float dx = filter()->applyHorizontalScale(m_dx); |
| float dy = filter()->applyVerticalScale(m_dy); |
| float stdX = filter()->applyHorizontalScale(m_stdX); |
| float stdY = filter()->applyHorizontalScale(m_stdY); |
| SkImageFilter::CropRect cropRect = getCropRect(builder->cropOffset()); |
| return adoptRef(new SkDropShadowImageFilter(SkFloatToScalar(dx), SkFloatToScalar(dy), SkFloatToScalar(stdX), SkFloatToScalar(stdY), m_shadowColor.rgb(), input.get(), &cropRect)); |
| } |
| |
| |
| TextStream& FEDropShadow::externalRepresentation(TextStream& ts, int indent) const |
| { |
| writeIndent(ts, indent); |
| ts << "[feDropShadow"; |
| FilterEffect::externalRepresentation(ts); |
| ts << " stdDeviation=\"" << m_stdX << ", " << m_stdY << "\" dx=\"" << m_dx << "\" dy=\"" << m_dy << "\" flood-color=\"" << m_shadowColor.nameForRenderTreeAsText() <<"\" flood-opacity=\"" << m_shadowOpacity << "]\n"; |
| inputEffect(0)->externalRepresentation(ts, indent + 1); |
| return ts; |
| } |
| |
| } // namespace WebCore |