1 /* 2 * Copyright (C) Research In Motion Limited 2011. All rights reserved. 3 * Copyright (C) 2013 Google Inc. All rights reserved. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 */ 20 21 #include "config.h" 22 #include "platform/graphics/filters/FEDropShadow.h" 23 24 #include "platform/graphics/GraphicsContext.h" 25 #include "platform/graphics/filters/FEGaussianBlur.h" 26 #include "platform/graphics/filters/SkiaImageFilterBuilder.h" 27 #include "platform/text/TextStream.h" 28 #include "third_party/skia/include/core/SkColorFilter.h" 29 #include "third_party/skia/include/effects/SkBlurImageFilter.h" 30 #include "third_party/skia/include/effects/SkDropShadowImageFilter.h" 31 32 namespace blink { 33 34 FEDropShadow::FEDropShadow(Filter* filter, float stdX, float stdY, float dx, float dy, const Color& shadowColor, float shadowOpacity) 35 : FilterEffect(filter) 36 , m_stdX(stdX) 37 , m_stdY(stdY) 38 , m_dx(dx) 39 , m_dy(dy) 40 , m_shadowColor(shadowColor) 41 , m_shadowOpacity(shadowOpacity) 42 { 43 } 44 45 PassRefPtr<FEDropShadow> FEDropShadow::create(Filter* filter, float stdX, float stdY, float dx, float dy, const Color& shadowColor, float shadowOpacity) 46 { 47 return adoptRef(new FEDropShadow(filter, stdX, stdY, dx, dy, shadowColor, shadowOpacity)); 48 } 49 50 FloatRect FEDropShadow::mapRect(const FloatRect& rect, bool forward) 51 { 52 FloatRect result = rect; 53 Filter* filter = this->filter(); 54 ASSERT(filter); 55 56 FloatRect offsetRect = rect; 57 if (forward) 58 offsetRect.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy)); 59 else 60 offsetRect.move(-filter->applyHorizontalScale(m_dx), -filter->applyVerticalScale(m_dy)); 61 result.unite(offsetRect); 62 63 IntSize kernelSize = FEGaussianBlur::calculateKernelSize(filter, FloatPoint(m_stdX, m_stdY)); 64 65 // We take the half kernel size and multiply it with three, because we run box blur three times. 66 result.inflateX(3 * kernelSize.width() * 0.5f); 67 result.inflateY(3 * kernelSize.height() * 0.5f); 68 return result; 69 } 70 71 void FEDropShadow::applySoftware() 72 { 73 FilterEffect* in = inputEffect(0); 74 75 ImageBuffer* resultImage = createImageBufferResult(); 76 if (!resultImage) 77 return; 78 79 Filter* filter = this->filter(); 80 FloatSize blurRadius(filter->applyHorizontalScale(m_stdX), filter->applyVerticalScale(m_stdY)); 81 FloatSize offset(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy)); 82 83 FloatRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect()); 84 GraphicsContext* resultContext = resultImage->context(); 85 ASSERT(resultContext); 86 87 Color color = adaptColorToOperatingColorSpace(m_shadowColor.combineWithAlpha(m_shadowOpacity)); 88 SkAutoTUnref<SkImageFilter> blurFilter(SkBlurImageFilter::Create(blurRadius.width(), blurRadius.height())); 89 SkAutoTUnref<SkColorFilter> colorFilter(SkColorFilter::CreateModeFilter(color.rgb(), SkXfermode::kSrcIn_Mode)); 90 SkPaint paint; 91 paint.setImageFilter(blurFilter.get()); 92 paint.setColorFilter(colorFilter.get()); 93 paint.setXfermodeMode(SkXfermode::kSrcOver_Mode); 94 RefPtr<Image> image = in->asImageBuffer()->copyImage(DontCopyBackingStore); 95 96 RefPtr<NativeImageSkia> nativeImage = image->nativeImageForCurrentFrame(); 97 98 if (!nativeImage) 99 return; 100 101 resultContext->drawBitmap(nativeImage->bitmap(), drawingRegion.x() + offset.width(), drawingRegion.y() + offset.height(), &paint); 102 resultContext->drawBitmap(nativeImage->bitmap(), drawingRegion.x(), drawingRegion.y()); 103 } 104 105 PassRefPtr<SkImageFilter> FEDropShadow::createImageFilter(SkiaImageFilterBuilder* builder) 106 { 107 RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace())); 108 float dx = filter()->applyHorizontalScale(m_dx); 109 float dy = filter()->applyVerticalScale(m_dy); 110 float stdX = filter()->applyHorizontalScale(m_stdX); 111 float stdY = filter()->applyVerticalScale(m_stdY); 112 Color color = adaptColorToOperatingColorSpace(m_shadowColor.combineWithAlpha(m_shadowOpacity)); 113 SkImageFilter::CropRect cropRect = getCropRect(builder->cropOffset()); 114 return adoptRef(SkDropShadowImageFilter::Create(SkFloatToScalar(dx), SkFloatToScalar(dy), SkFloatToScalar(stdX), SkFloatToScalar(stdY), color.rgb(), input.get(), &cropRect)); 115 } 116 117 118 TextStream& FEDropShadow::externalRepresentation(TextStream& ts, int indent) const 119 { 120 writeIndent(ts, indent); 121 ts << "[feDropShadow"; 122 FilterEffect::externalRepresentation(ts); 123 ts << " stdDeviation=\"" << m_stdX << ", " << m_stdY << "\" dx=\"" << m_dx << "\" dy=\"" << m_dy << "\" flood-color=\"" << m_shadowColor.nameForRenderTreeAsText() <<"\" flood-opacity=\"" << m_shadowOpacity << "]\n"; 124 inputEffect(0)->externalRepresentation(ts, indent + 1); 125 return ts; 126 } 127 128 } // namespace blink 129
