Add m-esr52 at 52.6.0

1 files changed, 309 insertions, 0 deletions

diff --git a/layout/generic/nsSplittableFrame.cpp b/layout/generic/nsSplittableFrame.cpp
new file mode 100644
index 000000000..00fbabc0c
--- /dev/null
+++ b/layout/generic/nsSplittableFrame.cpp
@@ -0,0 +1,309 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/*
+ * base class for rendering objects that can be split across lines,
+ * columns, or pages
+ */
+
+#include "nsSplittableFrame.h"
+#include "nsContainerFrame.h"
+#include "nsIFrameInlines.h"
+
+using namespace mozilla;
+
+void
+nsSplittableFrame::Init(nsIContent*       aContent,
+                        nsContainerFrame* aParent,
+                        nsIFrame*         aPrevInFlow)
+{
+  nsFrame::Init(aContent, aParent, aPrevInFlow);
+
+  if (aPrevInFlow) {
+    // Hook the frame into the flow
+    SetPrevInFlow(aPrevInFlow);
+    aPrevInFlow->SetNextInFlow(this);
+  }
+}
+
+void
+nsSplittableFrame::DestroyFrom(nsIFrame* aDestructRoot)
+{
+  // Disconnect from the flow list
+  if (mPrevContinuation || mNextContinuation) {
+    RemoveFromFlow(this);
+  }
+
+  // Let the base class destroy the frame
+  nsFrame::DestroyFrom(aDestructRoot);
+}
+
+nsSplittableType
+nsSplittableFrame::GetSplittableType() const
+{
+  return NS_FRAME_SPLITTABLE;
+}
+
+nsIFrame* nsSplittableFrame::GetPrevContinuation() const
+{
+  return mPrevContinuation;
+}
+
+void
+nsSplittableFrame::SetPrevContinuation(nsIFrame* aFrame)
+{
+  NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev continuation with incorrect type!");
+  NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
+  mPrevContinuation = aFrame;
+  RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
+}
+
+nsIFrame* nsSplittableFrame::GetNextContinuation() const
+{
+  return mNextContinuation;
+}
+
+void
+nsSplittableFrame::SetNextContinuation(nsIFrame* aFrame)
+{
+  NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(),  "setting a next continuation with incorrect type!");
+  NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
+  mNextContinuation = aFrame;
+  if (aFrame)
+    aFrame->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
+}
+
+nsIFrame*
+nsSplittableFrame::FirstContinuation() const
+{
+  nsSplittableFrame* firstContinuation = const_cast<nsSplittableFrame*>(this);
+  while (firstContinuation->mPrevContinuation)  {
+    firstContinuation = static_cast<nsSplittableFrame*>(firstContinuation->mPrevContinuation);
+  }
+  MOZ_ASSERT(firstContinuation, "post-condition failed");
+  return firstContinuation;
+}
+
+nsIFrame*
+nsSplittableFrame::LastContinuation() const
+{
+  nsSplittableFrame* lastContinuation = const_cast<nsSplittableFrame*>(this);
+  while (lastContinuation->mNextContinuation)  {
+    lastContinuation = static_cast<nsSplittableFrame*>(lastContinuation->mNextContinuation);
+  }
+  MOZ_ASSERT(lastContinuation, "post-condition failed");
+  return lastContinuation;
+}
+
+#ifdef DEBUG
+bool nsSplittableFrame::IsInPrevContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
+{
+  int32_t iterations = 0;
+  while (aFrame1 && iterations < 10) {
+    // Bail out after 10 iterations so we don't bog down debug builds too much
+    if (aFrame1 == aFrame2)
+      return true;
+    aFrame1 = aFrame1->GetPrevContinuation();
+    ++iterations;
+  }
+  return false;
+}
+
+bool nsSplittableFrame::IsInNextContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
+{
+  int32_t iterations = 0;
+  while (aFrame1 && iterations < 10) {
+    // Bail out after 10 iterations so we don't bog down debug builds too much
+    if (aFrame1 == aFrame2)
+      return true;
+    aFrame1 = aFrame1->GetNextContinuation();
+    ++iterations;
+  }
+  return false;
+}
+#endif
+
+nsIFrame* nsSplittableFrame::GetPrevInFlow() const
+{
+  return (GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? mPrevContinuation : nullptr;
+}
+
+void
+nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
+{
+  NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev in flow with incorrect type!");
+  NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
+  mPrevContinuation = aFrame;
+  AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
+}
+
+nsIFrame* nsSplittableFrame::GetNextInFlow() const
+{
+  return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? 
+    mNextContinuation : nullptr;
+}
+
+void
+nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
+{
+  NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(),  "setting a next in flow with incorrect type!");
+  NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
+  mNextContinuation = aFrame;
+  if (aFrame)
+    aFrame->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
+}
+
+nsIFrame*
+nsSplittableFrame::FirstInFlow() const
+{
+  nsSplittableFrame* firstInFlow = const_cast<nsSplittableFrame*>(this);
+  while (nsIFrame* prev = firstInFlow->GetPrevInFlow())  {
+    firstInFlow = static_cast<nsSplittableFrame*>(prev);
+  }
+  MOZ_ASSERT(firstInFlow, "post-condition failed");
+  return firstInFlow;
+}
+
+nsIFrame*
+nsSplittableFrame::LastInFlow() const
+{
+  nsSplittableFrame* lastInFlow = const_cast<nsSplittableFrame*>(this);
+  while (nsIFrame* next = lastInFlow->GetNextInFlow())  {
+    lastInFlow = static_cast<nsSplittableFrame*>(next);
+  }
+  MOZ_ASSERT(lastInFlow, "post-condition failed");
+  return lastInFlow;
+}
+
+// Remove this frame from the flow. Connects prev in flow and next in flow
+void
+nsSplittableFrame::RemoveFromFlow(nsIFrame* aFrame)
+{
+  nsIFrame* prevContinuation = aFrame->GetPrevContinuation();
+  nsIFrame* nextContinuation = aFrame->GetNextContinuation();
+
+  // The new continuation is fluid only if the continuation on both sides
+  // of the removed frame was fluid
+  if (aFrame->GetPrevInFlow() && aFrame->GetNextInFlow()) {
+    if (prevContinuation) {
+      prevContinuation->SetNextInFlow(nextContinuation);
+    }
+    if (nextContinuation) {
+      nextContinuation->SetPrevInFlow(prevContinuation);
+    }
+  } else {
+    if (prevContinuation) {
+      prevContinuation->SetNextContinuation(nextContinuation);
+    }
+    if (nextContinuation) {
+      nextContinuation->SetPrevContinuation(prevContinuation);
+    }
+  }
+
+  aFrame->SetPrevInFlow(nullptr);
+  aFrame->SetNextInFlow(nullptr);
+}
+
+nscoord
+nsSplittableFrame::GetConsumedBSize() const
+{
+  nscoord height = 0;
+  for (nsIFrame* prev = GetPrevInFlow(); prev; prev = prev->GetPrevInFlow()) {
+    height += prev->GetContentRectRelativeToSelf().height;
+  }
+  return height;
+}
+
+nscoord
+nsSplittableFrame::GetEffectiveComputedBSize(const ReflowInput& aReflowInput,
+                                              nscoord aConsumedBSize) const
+{
+  nscoord bSize = aReflowInput.ComputedBSize();
+  if (bSize == NS_INTRINSICSIZE) {
+    return NS_INTRINSICSIZE;
+  }
+
+  if (aConsumedBSize == NS_INTRINSICSIZE) {
+    aConsumedBSize = GetConsumedBSize();
+  }
+
+  bSize -= aConsumedBSize;
+
+  // We may have stretched the frame beyond its computed height. Oh well.
+  return std::max(0, bSize);
+}
+
+nsIFrame::LogicalSides
+nsSplittableFrame::GetLogicalSkipSides(const ReflowInput* aReflowInput) const
+{
+  if (IS_TRUE_OVERFLOW_CONTAINER(this)) {
+    return LogicalSides(eLogicalSideBitsBBoth);
+  }
+
+  if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
+                     StyleBoxDecorationBreak::Clone)) {
+    return LogicalSides();
+  }
+
+  LogicalSides skip;
+  if (GetPrevInFlow()) {
+    skip |= eLogicalSideBitsBStart;
+  }
+
+  if (aReflowInput) {
+    // We're in the midst of reflow right now, so it's possible that we haven't
+    // created a nif yet. If our content height is going to exceed our available
+    // height, though, then we're going to need a next-in-flow, it just hasn't
+    // been created yet.
+
+    if (NS_UNCONSTRAINEDSIZE != aReflowInput->AvailableBSize()) {
+      nscoord effectiveCH = this->GetEffectiveComputedBSize(*aReflowInput);
+      if (effectiveCH != NS_INTRINSICSIZE &&
+          effectiveCH > aReflowInput->AvailableBSize()) {
+        // Our content height is going to exceed our available height, so we're
+        // going to need a next-in-flow.
+        skip |= eLogicalSideBitsBEnd;
+      }
+    }
+  } else {
+    nsIFrame* nif = GetNextInFlow();
+    if (nif && !IS_TRUE_OVERFLOW_CONTAINER(nif)) {
+      skip |= eLogicalSideBitsBEnd;
+    }
+  }
+
+ return skip;
+}
+
+LogicalSides
+nsSplittableFrame::PreReflowBlockLevelLogicalSkipSides() const
+{
+  if (MOZ_UNLIKELY(IS_TRUE_OVERFLOW_CONTAINER(this))) {
+    return LogicalSides(mozilla::eLogicalSideBitsBBoth);
+  }
+  if (MOZ_LIKELY(StyleBorder()->mBoxDecorationBreak !=
+                   StyleBoxDecorationBreak::Clone) &&
+      GetPrevInFlow()) {
+    return LogicalSides(mozilla::eLogicalSideBitsBStart);
+  }
+  return LogicalSides();
+}
+
+#ifdef DEBUG
+void
+nsSplittableFrame::DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, int32_t aIndent)
+{
+  nsFrame::DumpBaseRegressionData(aPresContext, out, aIndent);
+  if (nullptr != mNextContinuation) {
+    IndentBy(out, aIndent);
+    fprintf(out, "<next-continuation va=\"%p\"/>\n", (void*)mNextContinuation);
+  }
+  if (nullptr != mPrevContinuation) {
+    IndentBy(out, aIndent);
+    fprintf(out, "<prev-continuation va=\"%p\"/>\n", (void*)mPrevContinuation);
+  }
+
+}
+#endif