| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "sky/engine/core/rendering/style/ShadowList.h" |
| |
| #include "sky/engine/platform/geometry/FloatRect.h" |
| #include "sky/engine/wtf/OwnPtr.h" |
| |
| namespace blink { |
| |
| static inline void calculateShadowExtent(const ShadowList* shadowList, float& shadowLeft, float& shadowRight, float& shadowTop, float& shadowBottom) |
| { |
| ASSERT(shadowList); |
| size_t shadowCount = shadowList->shadows().size(); |
| for (size_t i = 0; i < shadowCount; ++i) { |
| const ShadowData& shadow = shadowList->shadows()[i]; |
| if (shadow.style() == Inset) |
| continue; |
| float blurAndSpread = shadow.blur() + shadow.spread(); |
| shadowLeft = std::min(shadow.x() - blurAndSpread, shadowLeft); |
| shadowRight = std::max(shadow.x() + blurAndSpread, shadowRight); |
| shadowTop = std::min(shadow.y() - blurAndSpread, shadowTop); |
| shadowBottom = std::max(shadow.y() + blurAndSpread, shadowBottom); |
| } |
| } |
| |
| void ShadowList::adjustRectForShadow(LayoutRect& rect) const |
| { |
| FloatRect floatRect(rect); |
| adjustRectForShadow(floatRect); |
| rect = LayoutRect(floatRect); |
| } |
| |
| void ShadowList::adjustRectForShadow(FloatRect& rect) const |
| { |
| float shadowLeft = 0; |
| float shadowRight = 0; |
| float shadowTop = 0; |
| float shadowBottom = 0; |
| calculateShadowExtent(this, shadowLeft, shadowRight, shadowTop, shadowBottom); |
| |
| rect.move(shadowLeft, shadowTop); |
| rect.setWidth(rect.width() - shadowLeft + shadowRight); |
| rect.setHeight(rect.height() - shadowTop + shadowBottom); |
| } |
| |
| PassRefPtr<ShadowList> ShadowList::blend(const ShadowList* from, const ShadowList* to, double progress) |
| { |
| size_t fromLength = from ? from->shadows().size() : 0; |
| size_t toLength = to ? to->shadows().size() : 0; |
| if (!fromLength && !toLength) |
| return nullptr; |
| |
| ShadowDataVector shadows; |
| |
| DEFINE_STATIC_LOCAL(ShadowData, defaultShadowData, (FloatPoint(), 0, 0, Normal, Color::transparent)); |
| DEFINE_STATIC_LOCAL(ShadowData, defaultInsetShadowData, (FloatPoint(), 0, 0, Inset, Color::transparent)); |
| |
| size_t maxLength = std::max(fromLength, toLength); |
| for (size_t i = 0; i < maxLength; ++i) { |
| const ShadowData* fromShadow = i < fromLength ? &from->shadows()[i] : 0; |
| const ShadowData* toShadow = i < toLength ? &to->shadows()[i] : 0; |
| if (!fromShadow) |
| fromShadow = toShadow->style() == Inset ? &defaultInsetShadowData : &defaultShadowData; |
| else if (!toShadow) |
| toShadow = fromShadow->style() == Inset ? &defaultInsetShadowData : &defaultShadowData; |
| shadows.append(toShadow->blend(*fromShadow, progress)); |
| } |
| |
| return ShadowList::adopt(shadows); |
| } |
| |
| PassOwnPtr<DrawLooperBuilder> ShadowList::createDrawLooper(DrawLooperBuilder::ShadowAlphaMode alphaMode) const |
| { |
| OwnPtr<DrawLooperBuilder> drawLooperBuilder = DrawLooperBuilder::create(); |
| for (size_t i = shadows().size(); i--; ) { |
| const ShadowData& shadow = shadows()[i]; |
| drawLooperBuilder->addShadow(FloatSize(shadow.x(), shadow.y()), shadow.blur(), shadow.color(), |
| DrawLooperBuilder::ShadowRespectsTransforms, alphaMode); |
| } |
| drawLooperBuilder->addUnmodifiedContent(); |
| return drawLooperBuilder.release(); |
| } |
| |
| } // namespace blink |