/* * Copyright (C) 2013, 2016 Apple 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: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "config.h" #include "StyleChange.h" #include "RenderStyle.h" namespace WebCore { namespace Style { Change determineChange(const RenderStyle& s1, const RenderStyle& s2) { if (s1.display() != s2.display()) return Detach; if (s1.hasPseudoStyle(FIRST_LETTER) != s2.hasPseudoStyle(FIRST_LETTER)) return Detach; // We just detach if a renderer acquires or loses a column-span, since spanning elements // typically won't contain much content. if (s1.columnSpan() != s2.columnSpan()) return Detach; if (!s1.contentDataEquivalent(&s2)) return Detach; // When text-combine property has been changed, we need to prepare a separate renderer object. // When text-combine is on, we use RenderCombineText, otherwise RenderText. // https://bugs.webkit.org/show_bug.cgi?id=55069 if (s1.hasTextCombine() != s2.hasTextCombine()) return Detach; // We need to reattach the node, so that it is moved to the correct RenderFlowThread. if (s1.flowThread() != s2.flowThread()) return Detach; // When the region thread has changed, we need to prepare a separate render region object. if (s1.regionThread() != s2.regionThread()) return Detach; // FIXME: Multicolumn regions not yet supported (http://dev.w3.org/csswg/css-regions/#multi-column-regions) // When the node has region style and changed its multicol style, we have to prepare // a separate render region object. if (s1.hasFlowFrom() && (s1.specifiesColumns() != s2.specifiesColumns())) return Detach; if (s1 != s2) { if (s1.inheritedNotEqual(&s2)) return Inherit; if (s1.alignItems() != s2.alignItems() || s1.justifyItems() != s2.justifyItems()) return Inherit; return NoInherit; } // If the pseudoStyles have changed, we want any StyleChange that is not NoChange // because setStyle will do the right thing with anything else. if (s1.hasAnyPublicPseudoStyles()) { for (PseudoId pseudoId = FIRST_PUBLIC_PSEUDOID; pseudoId < FIRST_INTERNAL_PSEUDOID; pseudoId = static_cast<PseudoId>(pseudoId + 1)) { if (s1.hasPseudoStyle(pseudoId)) { RenderStyle* ps2 = s2.getCachedPseudoStyle(pseudoId); if (!ps2) return NoInherit; RenderStyle* ps1 = s1.getCachedPseudoStyle(pseudoId); if (!ps1 || *ps1 != *ps2) return NoInherit; } } } return NoChange; } } }