1 /* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 #include "core/platform/graphics/DrawLooper.h" 33 34 #include "core/platform/graphics/Color.h" 35 #include "core/platform/graphics/FloatSize.h" 36 #include "third_party/skia/include/core/SkColor.h" 37 #include "third_party/skia/include/core/SkColorFilter.h" 38 #include "third_party/skia/include/core/SkDrawLooper.h" 39 #include "third_party/skia/include/core/SkPaint.h" 40 #include "third_party/skia/include/core/SkXfermode.h" 41 #include "third_party/skia/include/effects/SkBlurMaskFilter.h" 42 #include "third_party/skia/include/effects/SkLayerDrawLooper.h" 43 44 namespace WebCore { 45 46 DrawLooper::DrawLooper() : m_skDrawLooper(adoptRef(new SkLayerDrawLooper)) { } 47 48 DrawLooper::~DrawLooper() { } 49 50 SkDrawLooper* DrawLooper::skDrawLooper() const 51 { 52 return m_skDrawLooper.get(); 53 } 54 55 void DrawLooper::addUnmodifiedContent() 56 { 57 SkLayerDrawLooper::LayerInfo info; 58 m_skDrawLooper->addLayerOnTop(info); 59 } 60 61 void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& color, 62 ShadowTransformMode shadowTransformMode, ShadowAlphaMode shadowAlphaMode) 63 { 64 // Detect when there's no effective shadow. 65 if (!color.alpha()) 66 return; 67 68 SkColor skColor = color.rgb(); 69 70 SkLayerDrawLooper::LayerInfo info; 71 72 switch (shadowAlphaMode) { 73 case ShadowRespectsAlpha: 74 info.fColorMode = SkXfermode::kDst_Mode; 75 break; 76 case ShadowIgnoresAlpha: 77 info.fColorMode = SkXfermode::kSrc_Mode; 78 break; 79 default: 80 ASSERT_NOT_REACHED(); 81 } 82 83 if (blur) 84 info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; // our blur 85 info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit; 86 info.fOffset.set(offset.width(), offset.height()); 87 info.fPostTranslate = (shadowTransformMode == ShadowIgnoresTransforms); 88 89 SkPaint* paint = m_skDrawLooper->addLayerOnTop(info); 90 91 if (blur) { 92 uint32_t mfFlags = SkBlurMaskFilter::kHighQuality_BlurFlag; 93 if (shadowTransformMode == ShadowIgnoresTransforms) 94 mfFlags |= SkBlurMaskFilter::kIgnoreTransform_BlurFlag; 95 RefPtr<SkMaskFilter> mf = adoptRef(SkBlurMaskFilter::Create( 96 (double)blur / 2.0, SkBlurMaskFilter::kNormal_BlurStyle, mfFlags)); 97 paint->setMaskFilter(mf.get()); 98 } 99 100 RefPtr<SkColorFilter> cf = adoptRef(SkColorFilter::CreateModeFilter(skColor, SkXfermode::kSrcIn_Mode)); 101 paint->setColorFilter(cf.get()); 102 } 103 104 } // namespace WebCore 105