diff -r 000000000000 -r 6474c204b198 layout/xul/nsBox.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsBox.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,972 @@
+/* -*- 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/. */
+
+#include "nsBoxLayoutState.h"
+#include "nsBox.h"
+#include "nsBoxFrame.h"
+#include "nsPresContext.h"
+#include "nsCOMPtr.h"
+#include "nsIContent.h"
+#include "nsContainerFrame.h"
+#include "nsNameSpaceManager.h"
+#include "nsGkAtoms.h"
+#include "nsFrameManager.h"
+#include "nsIDOMNode.h"
+#include "nsIDOMMozNamedAttrMap.h"
+#include "nsIDOMAttr.h"
+#include "nsITheme.h"
+#include "nsIServiceManager.h"
+#include "nsBoxLayout.h"
+#include "FrameLayerBuilder.h"
+#include <algorithm>
+
+using namespace mozilla;
+
+#ifdef DEBUG_LAYOUT
+int32_t gIndent = 0;
+#endif
+
+#ifdef DEBUG_LAYOUT
+void
+nsBoxAddIndents()
+{
+    for(int32_t i=0; i < gIndent; i++)
+    {
+        printf(" ");
+    }
+}
+#endif
+
+#ifdef DEBUG_LAYOUT
+void
+nsBox::AppendAttribute(const nsAutoString& aAttribute, const nsAutoString& aValue, nsAutoString& aResult)
+{
+   aResult.Append(aAttribute);
+   aResult.AppendLiteral("='");
+   aResult.Append(aValue);
+   aResult.AppendLiteral("' ");
+}
+
+void
+nsBox::ListBox(nsAutoString& aResult)
+{
+    nsAutoString name;
+    GetBoxName(name);
+
+    char addr[100];
+    sprintf(addr, "[@%p] ", static_cast<void*>(this));
+
+    aResult.AppendASCII(addr);
+    aResult.Append(name);
+    aResult.AppendLiteral(" ");
+
+    nsIContent* content = GetContent();
+
+    // add on all the set attributes
+    if (content) {
+      nsCOMPtr<nsIDOMNode> node(do_QueryInterface(content));
+      nsCOMPtr<nsIDOMMozNamedAttrMap> namedMap;
+
+      node->GetAttributes(getter_AddRefs(namedMap));
+      uint32_t length;
+      namedMap->GetLength(&length);
+
+      nsCOMPtr<nsIDOMAttr> attribute;
+      for (uint32_t i = 0; i < length; ++i)
+      {
+        namedMap->Item(i, getter_AddRefs(attribute));
+        attribute->GetName(name);
+        nsAutoString value;
+        attribute->GetValue(value);
+        AppendAttribute(name, value, aResult);
+      }
+    }
+}
+
+nsresult
+nsBox::DumpBox(FILE* aFile)
+{
+  nsAutoString s;
+  ListBox(s);
+  fprintf(aFile, "%s", NS_LossyConvertUTF16toASCII(s).get());
+  return NS_OK;
+}
+
+void
+nsBox::PropagateDebug(nsBoxLayoutState& aState)
+{
+  // propagate debug information
+  if (mState & NS_STATE_DEBUG_WAS_SET) {
+    if (mState & NS_STATE_SET_TO_DEBUG)
+      SetDebug(aState, true);
+    else
+      SetDebug(aState, false);
+  } else if (mState & NS_STATE_IS_ROOT) {
+    SetDebug(aState, gDebug);
+  }
+}
+#endif
+
+#ifdef DEBUG_LAYOUT
+void
+nsBox::GetBoxName(nsAutoString& aName)
+{
+  aName.AssignLiteral("Box");
+}
+#endif
+
+nsresult
+nsBox::BeginLayout(nsBoxLayoutState& aState)
+{
+#ifdef DEBUG_LAYOUT 
+
+  nsBoxAddIndents();
+  printf("Layout: ");
+  DumpBox(stdout);
+  printf("\n");
+  gIndent++;
+#endif
+
+  // mark ourselves as dirty so no child under us
+  // can post an incremental layout.
+  // XXXldb Is this still needed?
+  mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
+
+  if (GetStateBits() & NS_FRAME_IS_DIRTY)
+  {
+    // If the parent is dirty, all the children are dirty (nsHTMLReflowState
+    // does this too).
+    nsIFrame* box;
+    for (box = GetChildBox(); box; box = box->GetNextBox())
+      box->AddStateBits(NS_FRAME_IS_DIRTY);
+  }
+
+  // Another copy-over from nsHTMLReflowState.
+  // Since we are in reflow, we don't need to store these properties anymore.
+  FrameProperties props = Properties();
+  props.Delete(UsedBorderProperty());
+  props.Delete(UsedPaddingProperty());
+  props.Delete(UsedMarginProperty());
+
+#ifdef DEBUG_LAYOUT
+  PropagateDebug(aState);
+#endif
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBox::DoLayout(nsBoxLayoutState& aState)
+{
+  return NS_OK;
+}
+
+nsresult
+nsBox::EndLayout(nsBoxLayoutState& aState)
+{
+
+  #ifdef DEBUG_LAYOUT
+      --gIndent;
+  #endif
+
+  return SyncLayout(aState);
+}
+
+bool nsBox::gGotTheme = false;
+nsITheme* nsBox::gTheme = nullptr;
+
+nsBox::nsBox()
+{
+  MOZ_COUNT_CTOR(nsBox);
+  //mX = 0;
+  //mY = 0;
+  if (!gGotTheme) {
+    gGotTheme = true;
+    CallGetService("@mozilla.org/chrome/chrome-native-theme;1", &gTheme);
+  }
+}
+
+nsBox::~nsBox()
+{
+  // NOTE:  This currently doesn't get called for |nsBoxToBlockAdaptor|
+  // objects, so don't rely on putting anything here.
+  MOZ_COUNT_DTOR(nsBox);
+}
+
+/* static */ void
+nsBox::Shutdown()
+{
+  gGotTheme = false;
+  NS_IF_RELEASE(gTheme);
+}
+
+nsresult
+nsBox::RelayoutChildAtOrdinal(nsBoxLayoutState& aState, nsIFrame* aChild)
+{
+  return NS_OK;
+}
+
+nsresult
+nsIFrame::GetClientRect(nsRect& aClientRect)
+{
+  aClientRect = mRect;
+  aClientRect.MoveTo(0,0);
+
+  nsMargin borderPadding;
+  GetBorderAndPadding(borderPadding);
+
+  aClientRect.Deflate(borderPadding);
+
+  if (aClientRect.width < 0)
+     aClientRect.width = 0;
+
+  if (aClientRect.height < 0)
+     aClientRect.height = 0;
+
+ // NS_ASSERTION(aClientRect.width >=0 && aClientRect.height >= 0, "Content Size < 0");
+
+  return NS_OK;
+}
+
+void
+nsBox::SetBounds(nsBoxLayoutState& aState, const nsRect& aRect, bool aRemoveOverflowAreas)
+{
+    NS_BOX_ASSERTION(this, aRect.width >=0 && aRect.height >= 0, "SetBounds Size < 0");
+
+    nsRect rect(mRect);
+
+    uint32_t flags = 0;
+    GetLayoutFlags(flags);
+
+    uint32_t stateFlags = aState.LayoutFlags();
+
+    flags |= stateFlags;
+
+    if ((flags & NS_FRAME_NO_MOVE_FRAME) == NS_FRAME_NO_MOVE_FRAME)
+      SetSize(aRect.Size());
+    else
+      SetRect(aRect);
+
+    // Nuke the overflow area. The caller is responsible for restoring
+    // it if necessary.
+    if (aRemoveOverflowAreas) {
+      // remove the previously stored overflow area
+      ClearOverflowRects();
+    }
+
+    if (!(flags & NS_FRAME_NO_MOVE_VIEW))
+    {
+      nsContainerFrame::PositionFrameView(this);
+      if ((rect.x != aRect.x) || (rect.y != aRect.y))
+        nsContainerFrame::PositionChildViews(this);
+    }
+  
+
+   /*  
+    // only if the origin changed
+    if ((rect.x != aRect.x) || (rect.y != aRect.y))  {
+      if (frame->HasView()) {
+        nsContainerFrame::PositionFrameView(presContext, frame,
+                                            frame->GetView());
+      } else {
+        nsContainerFrame::PositionChildViews(presContext, frame);
+      }
+    }
+    */
+}
+
+void
+nsBox::GetLayoutFlags(uint32_t& aFlags)
+{
+  aFlags = 0;
+}
+
+
+nsresult
+nsIFrame::GetBorderAndPadding(nsMargin& aBorderAndPadding)
+{
+  aBorderAndPadding.SizeTo(0, 0, 0, 0);
+  nsresult rv = GetBorder(aBorderAndPadding);
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsMargin padding;
+  rv = GetPadding(padding);
+  if (NS_FAILED(rv))
+    return rv;
+
+  aBorderAndPadding += padding;
+
+  return rv;
+}
+
+nsresult
+nsBox::GetBorder(nsMargin& aMargin)
+{
+  aMargin.SizeTo(0,0,0,0);
+    
+  const nsStyleDisplay* disp = StyleDisplay();
+  if (disp->mAppearance && gTheme) {
+    // Go to the theme for the border.
+    nsPresContext *context = PresContext();
+    if (gTheme->ThemeSupportsWidget(context, this, disp->mAppearance)) {
+      nsIntMargin margin(0, 0, 0, 0);
+      gTheme->GetWidgetBorder(context->DeviceContext(), this,
+                              disp->mAppearance, &margin);
+      aMargin.top = context->DevPixelsToAppUnits(margin.top);
+      aMargin.right = context->DevPixelsToAppUnits(margin.right);
+      aMargin.bottom = context->DevPixelsToAppUnits(margin.bottom);
+      aMargin.left = context->DevPixelsToAppUnits(margin.left);
+      return NS_OK;
+    }
+  }
+
+  aMargin = StyleBorder()->GetComputedBorder();
+
+  return NS_OK;
+}
+
+nsresult
+nsBox::GetPadding(nsMargin& aMargin)
+{
+  const nsStyleDisplay *disp = StyleDisplay();
+  if (disp->mAppearance && gTheme) {
+    // Go to the theme for the padding.
+    nsPresContext *context = PresContext();
+    if (gTheme->ThemeSupportsWidget(context, this, disp->mAppearance)) {
+      nsIntMargin margin(0, 0, 0, 0);
+      bool useThemePadding;
+
+      useThemePadding = gTheme->GetWidgetPadding(context->DeviceContext(),
+                                                 this, disp->mAppearance,
+                                                 &margin);
+      if (useThemePadding) {
+        aMargin.top = context->DevPixelsToAppUnits(margin.top);
+        aMargin.right = context->DevPixelsToAppUnits(margin.right);
+        aMargin.bottom = context->DevPixelsToAppUnits(margin.bottom);
+        aMargin.left = context->DevPixelsToAppUnits(margin.left);
+        return NS_OK;
+      }
+    }
+  }
+
+  aMargin.SizeTo(0,0,0,0);
+  StylePadding()->GetPadding(aMargin);
+
+  return NS_OK;
+}
+
+nsresult
+nsBox::GetMargin(nsMargin& aMargin)
+{
+  aMargin.SizeTo(0,0,0,0);
+  StyleMargin()->GetMargin(aMargin);
+
+  return NS_OK;
+}
+
+void
+nsBox::SizeNeedsRecalc(nsSize& aSize)
+{
+  aSize.width  = -1;
+  aSize.height = -1;
+}
+
+void
+nsBox::CoordNeedsRecalc(nscoord& aFlex)
+{
+  aFlex = -1;
+}
+
+bool
+nsBox::DoesNeedRecalc(const nsSize& aSize)
+{
+  return (aSize.width == -1 || aSize.height == -1);
+}
+
+bool
+nsBox::DoesNeedRecalc(nscoord aCoord)
+{
+  return (aCoord == -1);
+}
+
+nsSize
+nsBox::GetPrefSize(nsBoxLayoutState& aState)
+{
+  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
+
+  nsSize pref(0,0);
+  DISPLAY_PREF_SIZE(this, pref);
+
+  if (IsCollapsed())
+    return pref;
+
+  AddBorderAndPadding(pref);
+  bool widthSet, heightSet;
+  nsIFrame::AddCSSPrefSize(this, pref, widthSet, heightSet);
+
+  nsSize minSize = GetMinSize(aState);
+  nsSize maxSize = GetMaxSize(aState);
+  return BoundsCheck(minSize, pref, maxSize);
+}
+
+nsSize
+nsBox::GetMinSize(nsBoxLayoutState& aState)
+{
+  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
+
+  nsSize min(0,0);
+  DISPLAY_MIN_SIZE(this, min);
+
+  if (IsCollapsed())
+    return min;
+
+  AddBorderAndPadding(min);
+  bool widthSet, heightSet;
+  nsIFrame::AddCSSMinSize(aState, this, min, widthSet, heightSet);
+  return min;
+}
+
+nsSize
+nsBox::GetMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState)
+{
+  return nsSize(0, 0);
+}
+
+nsSize
+nsBox::GetMaxSize(nsBoxLayoutState& aState)
+{
+  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
+
+  nsSize maxSize(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
+  DISPLAY_MAX_SIZE(this, maxSize);
+
+  if (IsCollapsed())
+    return maxSize;
+
+  AddBorderAndPadding(maxSize);
+  bool widthSet, heightSet;
+  nsIFrame::AddCSSMaxSize(this, maxSize, widthSet, heightSet);
+  return maxSize;
+}
+
+nscoord
+nsBox::GetFlex(nsBoxLayoutState& aState)
+{
+  nscoord flex = 0;
+
+  nsIFrame::AddCSSFlex(aState, this, flex);
+
+  return flex;
+}
+
+uint32_t
+nsIFrame::GetOrdinal()
+{
+  uint32_t ordinal = StyleXUL()->mBoxOrdinal;
+
+  // When present, attribute value overrides CSS.
+  nsIContent* content = GetContent();
+  if (content && content->IsXUL()) {
+    nsresult error;
+    nsAutoString value;
+
+    content->GetAttr(kNameSpaceID_None, nsGkAtoms::ordinal, value);
+    if (!value.IsEmpty()) {
+      ordinal = value.ToInteger(&error);
+    }
+  }
+
+  return ordinal;
+}
+
+nscoord
+nsBox::GetBoxAscent(nsBoxLayoutState& aState)
+{
+  if (IsCollapsed())
+    return 0;
+
+  return GetPrefSize(aState).height;
+}
+
+bool
+nsBox::IsCollapsed()
+{
+  return StyleVisibility()->mVisible == NS_STYLE_VISIBILITY_COLLAPSE;
+}
+
+nsresult
+nsIFrame::Layout(nsBoxLayoutState& aState)
+{
+  NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
+
+  nsBox *box = static_cast<nsBox*>(this);
+  DISPLAY_LAYOUT(box);
+
+  box->BeginLayout(aState);
+
+  box->DoLayout(aState);
+
+  box->EndLayout(aState);
+
+  return NS_OK;
+}
+
+bool
+nsBox::DoesClipChildren()
+{
+  const nsStyleDisplay* display = StyleDisplay();
+  NS_ASSERTION((display->mOverflowY == NS_STYLE_OVERFLOW_CLIP) ==
+               (display->mOverflowX == NS_STYLE_OVERFLOW_CLIP),
+               "If one overflow is clip, the other should be too");
+  return display->mOverflowX == NS_STYLE_OVERFLOW_CLIP;
+}
+
+nsresult
+nsBox::SyncLayout(nsBoxLayoutState& aState)
+{
+  /*
+  if (IsCollapsed()) {
+    CollapseChild(aState, this, true);
+    return NS_OK;
+  }
+  */
+  
+
+  if (GetStateBits() & NS_FRAME_IS_DIRTY)
+     Redraw(aState);
+
+  RemoveStateBits(NS_FRAME_HAS_DIRTY_CHILDREN | NS_FRAME_IS_DIRTY
+                  | NS_FRAME_FIRST_REFLOW | NS_FRAME_IN_REFLOW);
+
+  nsPresContext* presContext = aState.PresContext();
+
+  uint32_t flags = 0;
+  GetLayoutFlags(flags);
+
+  uint32_t stateFlags = aState.LayoutFlags();
+
+  flags |= stateFlags;
+
+  nsRect visualOverflow;
+
+  if (ComputesOwnOverflowArea()) {
+    visualOverflow = GetVisualOverflowRect();
+  }
+  else {
+    nsRect rect(nsPoint(0, 0), GetSize());
+    nsOverflowAreas overflowAreas(rect, rect);
+    if (!DoesClipChildren() && !IsCollapsed()) {
+      // See if our child frames caused us to overflow after being laid
+      // out. If so, store the overflow area.  This normally can't happen
+      // in XUL, but it can happen with the CSS 'outline' property and
+      // possibly with other exotic stuff (e.g. relatively positioned
+      // frames in HTML inside XUL).
+      nsLayoutUtils::UnionChildOverflow(this, overflowAreas);
+    }
+
+    FinishAndStoreOverflow(overflowAreas, GetSize());
+    visualOverflow = overflowAreas.VisualOverflow();
+  }
+
+  nsView* view = GetView();
+  if (view) {
+    // Make sure the frame's view is properly sized and positioned and has
+    // things like opacity correct
+    nsContainerFrame::SyncFrameViewAfterReflow(presContext, this, view,
+                                               visualOverflow, flags);
+  } 
+
+  return NS_OK;
+}
+
+nsresult
+nsIFrame::Redraw(nsBoxLayoutState& aState)
+{
+  if (aState.PaintingDisabled())
+    return NS_OK;
+
+  // nsStackLayout, at least, expects us to repaint descendants even
+  // if a damage rect is provided
+  InvalidateFrameSubtree();
+
+  return NS_OK;
+}
+
+bool
+nsIFrame::AddCSSPrefSize(nsIFrame* aBox, nsSize& aSize, bool &aWidthSet, bool &aHeightSet)
+{
+    aWidthSet = false;
+    aHeightSet = false;
+
+    // add in the css min, max, pref
+    const nsStylePosition* position = aBox->StylePosition();
+
+    // see if the width or height was specifically set
+    // XXX Handle eStyleUnit_Enumerated?
+    // (Handling the eStyleUnit_Enumerated types requires
+    // GetPrefSize/GetMinSize methods that don't consider
+    // (min-/max-/)(width/height) properties.)
+    const nsStyleCoord &width = position->mWidth;
+    if (width.GetUnit() == eStyleUnit_Coord) {
+        aSize.width = width.GetCoordValue();
+        aWidthSet = true;
+    } else if (width.IsCalcUnit()) {
+        if (!width.CalcHasPercent()) {
+            // pass 0 for percentage basis since we know there are no %s
+            aSize.width = nsRuleNode::ComputeComputedCalc(width, 0);
+            if (aSize.width < 0)
+                aSize.width = 0;
+            aWidthSet = true;
+        }
+    }
+
+    const nsStyleCoord &height = position->mHeight;
+    if (height.GetUnit() == eStyleUnit_Coord) {
+        aSize.height = height.GetCoordValue();
+        aHeightSet = true;
+    } else if (height.IsCalcUnit()) {
+        if (!height.CalcHasPercent()) {
+            // pass 0 for percentage basis since we know there are no %s
+            aSize.height = nsRuleNode::ComputeComputedCalc(height, 0);
+            if (aSize.height < 0)
+                aSize.height = 0;
+            aHeightSet = true;
+        }
+    }
+
+    nsIContent* content = aBox->GetContent();
+    // ignore 'height' and 'width' attributes if the actual element is not XUL
+    // For example, we might be magic XUL frames whose primary content is an HTML
+    // <select>
+    if (content && content->IsXUL()) {
+        nsAutoString value;
+        nsresult error;
+
+        content->GetAttr(kNameSpaceID_None, nsGkAtoms::width, value);
+        if (!value.IsEmpty()) {
+            value.Trim("%");
+
+            aSize.width =
+              nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
+            aWidthSet = true;
+        }
+
+        content->GetAttr(kNameSpaceID_None, nsGkAtoms::height, value);
+        if (!value.IsEmpty()) {
+            value.Trim("%");
+
+            aSize.height =
+              nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
+            aHeightSet = true;
+        }
+    }
+
+    return (aWidthSet && aHeightSet);
+}
+
+
+bool
+nsIFrame::AddCSSMinSize(nsBoxLayoutState& aState, nsIFrame* aBox, nsSize& aSize,
+                      bool &aWidthSet, bool &aHeightSet)
+{
+    aWidthSet = false;
+    aHeightSet = false;
+
+    bool canOverride = true;
+
+    // See if a native theme wants to supply a minimum size.
+    const nsStyleDisplay* display = aBox->StyleDisplay();
+    if (display->mAppearance) {
+      nsITheme *theme = aState.PresContext()->GetTheme();
+      if (theme && theme->ThemeSupportsWidget(aState.PresContext(), aBox, display->mAppearance)) {
+        nsIntSize size;
+        nsRenderingContext* rendContext = aState.GetRenderingContext();
+        if (rendContext) {
+          theme->GetMinimumWidgetSize(rendContext, aBox,
+                                      display->mAppearance, &size, &canOverride);
+          if (size.width) {
+            aSize.width = aState.PresContext()->DevPixelsToAppUnits(size.width);
+            aWidthSet = true;
+          }
+          if (size.height) {
+            aSize.height = aState.PresContext()->DevPixelsToAppUnits(size.height);
+            aHeightSet = true;
+          }
+        }
+      }
+    }
+
+    // add in the css min, max, pref
+    const nsStylePosition* position = aBox->StylePosition();
+
+    // same for min size. Unfortunately min size is always set to 0. So for now
+    // we will assume 0 (as a coord) means not set.
+    const nsStyleCoord &minWidth = position->mMinWidth;
+    if ((minWidth.GetUnit() == eStyleUnit_Coord &&
+         minWidth.GetCoordValue() != 0) ||
+        (minWidth.IsCalcUnit() && !minWidth.CalcHasPercent())) {
+        nscoord min = nsRuleNode::ComputeCoordPercentCalc(minWidth, 0);
+        if (!aWidthSet || (min > aSize.width && canOverride)) {
+           aSize.width = min;
+           aWidthSet = true;
+        }
+    } else if (minWidth.GetUnit() == eStyleUnit_Percent) {
+        NS_ASSERTION(minWidth.GetPercentValue() == 0.0f,
+          "Non-zero percentage values not currently supported");
+        aSize.width = 0;
+        aWidthSet = true; // FIXME: should we really do this for
+                             // nonzero values?
+    }
+    // XXX Handle eStyleUnit_Enumerated?
+    // (Handling the eStyleUnit_Enumerated types requires
+    // GetPrefSize/GetMinSize methods that don't consider
+    // (min-/max-/)(width/height) properties.
+    // calc() with percentage is treated like '0' (unset)
+
+    const nsStyleCoord &minHeight = position->mMinHeight;
+    if ((minHeight.GetUnit() == eStyleUnit_Coord &&
+         minHeight.GetCoordValue() != 0) ||
+        (minHeight.IsCalcUnit() && !minHeight.CalcHasPercent())) {
+        nscoord min = nsRuleNode::ComputeCoordPercentCalc(minHeight, 0);
+        if (!aHeightSet || (min > aSize.height && canOverride)) {
+           aSize.height = min;
+           aHeightSet = true;
+        }
+    } else if (minHeight.GetUnit() == eStyleUnit_Percent) {
+        NS_ASSERTION(position->mMinHeight.GetPercentValue() == 0.0f,
+          "Non-zero percentage values not currently supported");
+        aSize.height = 0;
+        aHeightSet = true; // FIXME: should we really do this for
+                              // nonzero values?
+    }
+    // calc() with percentage is treated like '0' (unset)
+
+    nsIContent* content = aBox->GetContent();
+    if (content && content->IsXUL()) {
+        nsAutoString value;
+        nsresult error;
+
+        content->GetAttr(kNameSpaceID_None, nsGkAtoms::minwidth, value);
+        if (!value.IsEmpty())
+        {
+            value.Trim("%");
+
+            nscoord val =
+              nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
+            if (val > aSize.width)
+              aSize.width = val;
+            aWidthSet = true;
+        }
+
+        content->GetAttr(kNameSpaceID_None, nsGkAtoms::minheight, value);
+        if (!value.IsEmpty())
+        {
+            value.Trim("%");
+
+            nscoord val =
+              nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
+            if (val > aSize.height)
+              aSize.height = val;
+
+            aHeightSet = true;
+        }
+    }
+
+    return (aWidthSet && aHeightSet);
+}
+
+bool
+nsIFrame::AddCSSMaxSize(nsIFrame* aBox, nsSize& aSize, bool &aWidthSet, bool &aHeightSet)
+{
+    aWidthSet = false;
+    aHeightSet = false;
+
+    // add in the css min, max, pref
+    const nsStylePosition* position = aBox->StylePosition();
+
+    // and max
+    // see if the width or height was specifically set
+    // XXX Handle eStyleUnit_Enumerated?
+    // (Handling the eStyleUnit_Enumerated types requires
+    // GetPrefSize/GetMinSize methods that don't consider
+    // (min-/max-/)(width/height) properties.)
+    const nsStyleCoord maxWidth = position->mMaxWidth;
+    if (maxWidth.ConvertsToLength()) {
+        aSize.width = nsRuleNode::ComputeCoordPercentCalc(maxWidth, 0);
+        aWidthSet = true;
+    }
+    // percentages and calc() with percentages are treated like 'none'
+
+    const nsStyleCoord &maxHeight = position->mMaxHeight;
+    if (maxHeight.ConvertsToLength()) {
+        aSize.height = nsRuleNode::ComputeCoordPercentCalc(maxHeight, 0);
+        aHeightSet = true;
+    }
+    // percentages and calc() with percentages are treated like 'none'
+
+    nsIContent* content = aBox->GetContent();
+    if (content && content->IsXUL()) {
+        nsAutoString value;
+        nsresult error;
+
+        content->GetAttr(kNameSpaceID_None, nsGkAtoms::maxwidth, value);
+        if (!value.IsEmpty()) {
+            value.Trim("%");
+
+            nscoord val =
+              nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
+            aSize.width = val;
+            aWidthSet = true;
+        }
+
+        content->GetAttr(kNameSpaceID_None, nsGkAtoms::maxheight, value);
+        if (!value.IsEmpty()) {
+            value.Trim("%");
+
+            nscoord val =
+              nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
+            aSize.height = val;
+
+            aHeightSet = true;
+        }
+    }
+
+    return (aWidthSet || aHeightSet);
+}
+
+bool
+nsIFrame::AddCSSFlex(nsBoxLayoutState& aState, nsIFrame* aBox, nscoord& aFlex)
+{
+    bool flexSet = false;
+
+    // get the flexibility
+    aFlex = aBox->StyleXUL()->mBoxFlex;
+
+    // attribute value overrides CSS
+    nsIContent* content = aBox->GetContent();
+    if (content && content->IsXUL()) {
+        nsresult error;
+        nsAutoString value;
+
+        content->GetAttr(kNameSpaceID_None, nsGkAtoms::flex, value);
+        if (!value.IsEmpty()) {
+            value.Trim("%");
+            aFlex = value.ToInteger(&error);
+            flexSet = true;
+        }
+    }
+
+    if (aFlex < 0)
+      aFlex = 0;
+    if (aFlex >= nscoord_MAX)
+      aFlex = nscoord_MAX - 1;
+
+    return flexSet || aFlex > 0;
+}
+
+void
+nsBox::AddBorderAndPadding(nsSize& aSize)
+{
+  AddBorderAndPadding(this, aSize);
+}
+
+void
+nsBox::AddBorderAndPadding(nsIFrame* aBox, nsSize& aSize)
+{
+  nsMargin borderPadding(0,0,0,0);
+  aBox->GetBorderAndPadding(borderPadding);
+  AddMargin(aSize, borderPadding);
+}
+
+void
+nsBox::AddMargin(nsIFrame* aChild, nsSize& aSize)
+{
+  nsMargin margin(0,0,0,0);
+  aChild->GetMargin(margin);
+  AddMargin(aSize, margin);
+}
+
+void
+nsBox::AddMargin(nsSize& aSize, const nsMargin& aMargin)
+{
+  if (aSize.width != NS_INTRINSICSIZE)
+    aSize.width += aMargin.left + aMargin.right;
+
+  if (aSize.height != NS_INTRINSICSIZE)
+     aSize.height += aMargin.top + aMargin.bottom;
+}
+
+nscoord
+nsBox::BoundsCheck(nscoord aMin, nscoord aPref, nscoord aMax)
+{
+   if (aPref > aMax)
+       aPref = aMax;
+
+   if (aPref < aMin)
+       aPref = aMin;
+
+   return aPref;
+}
+
+nsSize
+nsBox::BoundsCheckMinMax(const nsSize& aMinSize, const nsSize& aMaxSize)
+{
+  return nsSize(std::max(aMaxSize.width, aMinSize.width),
+                std::max(aMaxSize.height, aMinSize.height));
+}
+
+nsSize
+nsBox::BoundsCheck(const nsSize& aMinSize, const nsSize& aPrefSize, const nsSize& aMaxSize)
+{
+  return nsSize(BoundsCheck(aMinSize.width, aPrefSize.width, aMaxSize.width),
+                BoundsCheck(aMinSize.height, aPrefSize.height, aMaxSize.height));
+}
+
+#ifdef DEBUG_LAYOUT
+nsresult
+nsBox::SetDebug(nsBoxLayoutState& aState, bool aDebug)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBox::GetDebugBoxAt( const nsPoint& aPoint,
+                      nsIFrame**     aBox)
+{
+  nsRect thisRect(nsPoint(0,0), GetSize());
+  if (!thisRect.Contains(aPoint))
+    return NS_ERROR_FAILURE;
+
+  nsIFrame* child = GetChildBox();
+  nsIFrame* hit = nullptr;
+
+  *aBox = nullptr;
+  while (nullptr != child) {
+    nsresult rv = child->GetDebugBoxAt(aPoint - child->GetOffsetTo(this), &hit);
+
+    if (NS_SUCCEEDED(rv) && hit) {
+      *aBox = hit;
+    }
+    child = child->GetNextBox();
+  }
+
+  // found a child
+  if (*aBox) {
+    return NS_OK;
+  }
+
+  return NS_ERROR_FAILURE;
+}
+
+
+nsresult
+nsBox::GetDebug(bool& aDebug)
+{
+  aDebug = false;
+  return NS_OK;
+}
+
+#endif