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-rw-r--r--layout/base/nsStyleChangeList.cpp72
1 files changed, 72 insertions, 0 deletions
diff --git a/layout/base/nsStyleChangeList.cpp b/layout/base/nsStyleChangeList.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * a list of the recomputation that needs to be done in response to a
+ * style change
+ */
+
+#include "nsStyleChangeList.h"
+
+#include "mozilla/dom/ElementInlines.h"
+
+#include "nsCSSFrameConstructor.h"
+#include "nsIContent.h"
+#include "nsIFrame.h"
+
+void nsStyleChangeList::AppendChange(nsIFrame* aFrame, nsIContent* aContent,
+ nsChangeHint aHint) {
+ MOZ_ASSERT(aFrame || (aHint & nsChangeHint_ReconstructFrame),
+ "must have frame");
+ MOZ_ASSERT(aHint, "No hint to process?");
+ MOZ_ASSERT(!(aHint & nsChangeHint_NeutralChange),
+ "Neutral changes do not need extra processing, "
+ "and should be stripped out");
+ MOZ_ASSERT(aContent || !(aHint & nsChangeHint_ReconstructFrame),
+ "must have content");
+ // XXXbz we should make this take Element instead of nsIContent
+ MOZ_ASSERT(
+ !aContent || aContent->IsElement() ||
+ // display:contents elements posts the changes for their children:
+ (aFrame && aContent->GetFlattenedTreeParentElementForStyle() &&
+ Servo_Element_IsDisplayContents(
+ aContent->GetFlattenedTreeParentElementForStyle())) ||
+ (aContent->IsText() && aContent->HasFlag(NODE_NEEDS_FRAME) &&
+ aHint & nsChangeHint_ReconstructFrame),
+ "Shouldn't be trying to restyle non-elements directly, "
+ "except if it's a display:contents child or a text node "
+ "doing lazy frame construction");
+ MOZ_ASSERT(!(aHint & nsChangeHint_AllReflowHints) ||
+ (aHint & nsChangeHint_NeedReflow),
+ "Reflow hint bits set without actually asking for a reflow");
+
+ if (aHint & nsChangeHint_ReconstructFrame) {
+ // If Servo fires reconstruct at a node, it is the only change hint fired at
+ // that node.
+
+ // Note: Because we check whether |aHint| is a reconstruct above (which is
+ // necessary to avoid debug test timeouts on certain crashtests), this check
+ // will not find bugs where we add a non-reconstruct hint for an element
+ // after adding a reconstruct. This is ok though, since
+ // ProcessRestyledFrames will handle that case via mDestroyedFrames.
+#ifdef DEBUG
+ for (size_t i = 0; i < Length(); ++i) {
+ MOZ_ASSERT(aContent != (*this)[i].mContent ||
+ !((*this)[i].mHint & nsChangeHint_ReconstructFrame),
+ "Should not append a non-ReconstructFrame hint after \
+ appending a ReconstructFrame hint for the same \
+ content.");
+ }
+#endif
+ }
+
+ if (!IsEmpty() && aFrame && aFrame == LastElement().mFrame) {
+ LastElement().mHint |= aHint;
+ return;
+ }
+
+ AppendElement(nsStyleChangeData{aFrame, aContent, aHint});
+}