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StyleChange.cpp
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88 lines (78 loc) · 3.62 KB
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/*
* 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 Change::Renderer;
if (s1.hasPseudoStyle(PseudoId::FirstLetter) != s2.hasPseudoStyle(PseudoId::FirstLetter))
return Change::Renderer;
// We just detach if a renderer acquires or loses a column-span, since spanning elements
// typically won't contain much content.
auto columnSpanNeedsNewRenderer = [&] {
if (s1.columnSpan() != s2.columnSpan())
return true;
if (s1.columnSpan() != ColumnSpan::All)
return false;
// Spanning in ignored for floating and out-of-flow boxes.
return s1.isFloating() != s2.isFloating() || s1.hasOutOfFlowPosition() != s2.hasOutOfFlowPosition();
}();
if (columnSpanNeedsNewRenderer)
return Change::Renderer;
if (!s1.contentDataEquivalent(&s2))
return Change::Renderer;
// 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 Change::Renderer;
if (!s1.inheritedEqual(s2))
return Change::Inherited;
if (!s1.descendantAffectingNonInheritedPropertiesEqual(s2))
return Change::Inherited;
if (s1 != s2)
return Change::NonInherited;
// 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 = PseudoId::FirstPublicPseudoId; pseudoId < PseudoId::FirstInternalPseudoId; pseudoId = static_cast<PseudoId>(static_cast<unsigned>(pseudoId) + 1)) {
if (s1.hasPseudoStyle(pseudoId)) {
RenderStyle* ps2 = s2.getCachedPseudoStyle(pseudoId);
if (!ps2)
return Change::NonInherited;
RenderStyle* ps1 = s1.getCachedPseudoStyle(pseudoId);
if (!ps1 || *ps1 != *ps2)
return Change::NonInherited;
}
}
}
return Change::None;
}
}
}