The Tor Browser: layout/xul/nsLeafBoxFrame.cpp@97036ab72558 (annotated)

layout/xul/nsLeafBoxFrame.cpp@97036ab72558 (annotated)

layout/xul/nsLeafBoxFrame.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 8; 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/. */
 //
 // Eric Vaughan
 // Netscape Communications
 //
 // See documentation in associated header file
 //
 #include "nsLeafBoxFrame.h"
 #include "nsBoxFrame.h"
 #include "nsCOMPtr.h"
 #include "nsGkAtoms.h"
 #include "nsPresContext.h"
 #include "nsStyleContext.h"
 #include "nsIContent.h"
 #include "nsNameSpaceManager.h"
 #include "nsBoxLayoutState.h"
 #include "nsWidgetsCID.h"
 #include "nsViewManager.h"
 #include "nsContainerFrame.h"
 #include "nsDisplayList.h"
 #include <algorithm>
 //
 // NS_NewLeafBoxFrame
 //
 // Creates a new Toolbar frame and returns it
 //
 nsIFrame*
 NS_NewLeafBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) nsLeafBoxFrame(aPresShell, aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsLeafBoxFrame)
 nsLeafBoxFrame::nsLeafBoxFrame(nsIPresShell* aShell, nsStyleContext* aContext)
     : nsLeafFrame(aContext)
 {
 }
 #ifdef DEBUG_LAYOUT
 void
 nsLeafBoxFrame::GetBoxName(nsAutoString& aName)
 {
    GetFrameName(aName);
 }
 #endif
 /**
  * Initialize us. This is a good time to get the alignment of the box
  */
 void
 nsLeafBoxFrame::Init(
               nsIContent*      aContent,
               nsIFrame*        aParent,
               nsIFrame*        aPrevInFlow)
 {
   nsLeafFrame::Init(aContent, aParent, aPrevInFlow);
   if (GetStateBits() & NS_FRAME_FONT_INFLATION_CONTAINER) {
     AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
   }
   UpdateMouseThrough();
 }
 nsresult
 nsLeafBoxFrame::AttributeChanged(int32_t aNameSpaceID,
                                  nsIAtom* aAttribute,
                                  int32_t aModType)
 {
   nsresult rv = nsLeafFrame::AttributeChanged(aNameSpaceID, aAttribute,
                                               aModType);
   if (aAttribute == nsGkAtoms::mousethrough)
     UpdateMouseThrough();
   return rv;
 }
 void nsLeafBoxFrame::UpdateMouseThrough()
 {
   if (mContent) {
     static nsIContent::AttrValuesArray strings[] =
       {&nsGkAtoms::never, &nsGkAtoms::always, nullptr};
     switch (mContent->FindAttrValueIn(kNameSpaceID_None,
                                       nsGkAtoms::mousethrough,
                                       strings, eCaseMatters)) {
       case 0: AddStateBits(NS_FRAME_MOUSE_THROUGH_NEVER); break;
       case 1: AddStateBits(NS_FRAME_MOUSE_THROUGH_ALWAYS); break;
       case 2: {
           RemoveStateBits(NS_FRAME_MOUSE_THROUGH_ALWAYS);
           RemoveStateBits(NS_FRAME_MOUSE_THROUGH_NEVER);
           break;
       }
     }
   }
 }
 void
 nsLeafBoxFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                  const nsRect&           aDirtyRect,
                                  const nsDisplayListSet& aLists)
 {
   // REVIEW: GetFrameForPoint used to not report events for the background
   // layer, whereas this code will put an event receiver for this frame in the
   // BlockBorderBackground() list. But I don't see any need to preserve
   // that anomalous behaviour. The important thing I'm preserving is that
   // leaf boxes continue to receive events in the foreground layer.
   DisplayBorderBackgroundOutline(aBuilder, aLists);
   if (!aBuilder->IsForEventDelivery() || !IsVisibleForPainting(aBuilder))
     return;
   aLists.Content()->AppendNewToTop(new (aBuilder)
     nsDisplayEventReceiver(aBuilder, this));
 }
 /* virtual */ nscoord
 nsLeafBoxFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
 {
   nscoord result;
   DISPLAY_MIN_WIDTH(this, result);
   nsBoxLayoutState state(PresContext(), aRenderingContext);
   nsSize minSize = GetMinSize(state);
   // GetMinSize returns border-box width, and we want to return content
   // width.  Since Reflow uses the reflow state's border and padding, we
   // actually just want to subtract what GetMinSize added, which is the
   // result of GetBorderAndPadding.
   nsMargin bp;
   GetBorderAndPadding(bp);
   result = minSize.width - bp.LeftRight();
   return result;
 }
 /* virtual */ nscoord
 nsLeafBoxFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
 {
   nscoord result;
   DISPLAY_PREF_WIDTH(this, result);
   nsBoxLayoutState state(PresContext(), aRenderingContext);
   nsSize prefSize = GetPrefSize(state);
   // GetPrefSize returns border-box width, and we want to return content
   // width.  Since Reflow uses the reflow state's border and padding, we
   // actually just want to subtract what GetPrefSize added, which is the
   // result of GetBorderAndPadding.
   nsMargin bp;
   GetBorderAndPadding(bp);
   result = prefSize.width - bp.LeftRight();
   return result;
 }
 nscoord
 nsLeafBoxFrame::GetIntrinsicWidth()
 {
   // No intrinsic width
   return 0;
 }
 nsSize
 nsLeafBoxFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
                                 nsSize aCBSize, nscoord aAvailableWidth,
                                 nsSize aMargin, nsSize aBorder,
                                 nsSize aPadding, bool aShrinkWrap)
 {
   // Important: NOT calling our direct superclass here!
   return nsFrame::ComputeAutoSize(aRenderingContext, aCBSize, aAvailableWidth,
                                   aMargin, aBorder, aPadding, aShrinkWrap);
 }
 nsresult
 nsLeafBoxFrame::Reflow(nsPresContext*   aPresContext,
                      nsHTMLReflowMetrics&     aDesiredSize,
                      const nsHTMLReflowState& aReflowState,
                      nsReflowStatus&          aStatus)
 {
   // This is mostly a copy of nsBoxFrame::Reflow().
   // We aren't able to share an implementation because of the frame
   // class hierarchy.  If you make changes here, please keep
   // nsBoxFrame::Reflow in sync.
   DO_GLOBAL_REFLOW_COUNT("nsLeafBoxFrame");
   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
   NS_ASSERTION(aReflowState.ComputedWidth() >=0 &&
                aReflowState.ComputedHeight() >= 0, "Computed Size < 0");
 #ifdef DO_NOISY_REFLOW
   printf("\n-------------Starting LeafBoxFrame Reflow ----------------------------\n");
   printf("%p ** nsLBF::Reflow %d R: ", this, myCounter++);
   switch (aReflowState.reason) {
     case eReflowReason_Initial:
       printf("Ini");break;
     case eReflowReason_Incremental:
       printf("Inc");break;
     case eReflowReason_Resize:
       printf("Rsz");break;
     case eReflowReason_StyleChange:
       printf("Sty");break;
     case eReflowReason_Dirty:
       printf("Drt ");
       break;
     default:printf("<unknown>%d", aReflowState.reason);break;
   }
   printSize("AW", aReflowState.AvailableWidth());
   printSize("AH", aReflowState.AvailableHeight());
   printSize("CW", aReflowState.ComputedWidth());
   printSize("CH", aReflowState.ComputedHeight());
   printf(" *\n");
 #endif
   aStatus = NS_FRAME_COMPLETE;
   // create the layout state
   nsBoxLayoutState state(aPresContext, aReflowState.rendContext);
   nsSize computedSize(aReflowState.ComputedWidth(),aReflowState.ComputedHeight());
   nsMargin m;
   m = aReflowState.ComputedPhysicalBorderPadding();
   //GetBorderAndPadding(m);
   // this happens sometimes. So lets handle it gracefully.
   if (aReflowState.ComputedHeight() == 0) {
     nsSize minSize = GetMinSize(state);
     computedSize.height = minSize.height - m.top - m.bottom;
   }
   nsSize prefSize(0,0);
   // if we are told to layout intrinic then get our preferred size.
   if (computedSize.width == NS_INTRINSICSIZE || computedSize.height == NS_INTRINSICSIZE) {
      prefSize = GetPrefSize(state);
      nsSize minSize = GetMinSize(state);
      nsSize maxSize = GetMaxSize(state);
      prefSize = BoundsCheck(minSize, prefSize, maxSize);
   }
   // get our desiredSize
   if (aReflowState.ComputedWidth() == NS_INTRINSICSIZE) {
     computedSize.width = prefSize.width;
   } else {
     computedSize.width += m.left + m.right;
   }
   if (aReflowState.ComputedHeight() == NS_INTRINSICSIZE) {
     computedSize.height = prefSize.height;
   } else {
     computedSize.height += m.top + m.bottom;
   }
   // handle reflow state min and max sizes
   // XXXbz the width handling here seems to be wrong, since
   // mComputedMin/MaxWidth is a content-box size, whole
   // computedSize.width is a border-box size...
   if (computedSize.width > aReflowState.ComputedMaxWidth())
     computedSize.width = aReflowState.ComputedMaxWidth();
   if (computedSize.width < aReflowState.ComputedMinWidth())
     computedSize.width = aReflowState.ComputedMinWidth();
   // Now adjust computedSize.height for our min and max computed
   // height.  The only problem is that those are content-box sizes,
   // while computedSize.height is a border-box size.  So subtract off
   // m.TopBottom() before adjusting, then readd it.
   computedSize.height = std::max(0, computedSize.height - m.TopBottom());
   computedSize.height = NS_CSS_MINMAX(computedSize.height,
                                       aReflowState.ComputedMinHeight(),
                                       aReflowState.ComputedMaxHeight());
   computedSize.height += m.TopBottom();
   nsRect r(mRect.x, mRect.y, computedSize.width, computedSize.height);
   SetBounds(state, r);
   // layout our children
   Layout(state);
   // ok our child could have gotten bigger. So lets get its bounds
   aDesiredSize.Width() = mRect.width;
   aDesiredSize.Height() = mRect.height;
   aDesiredSize.SetTopAscent(GetBoxAscent(state));
   // the overflow rect is set in SetBounds() above
   aDesiredSize.mOverflowAreas = GetOverflowAreas();
 #ifdef DO_NOISY_REFLOW
   {
     printf("%p ** nsLBF(done) W:%d H:%d  ", this, aDesiredSize.Width(), aDesiredSize.Height());
     if (maxElementWidth) {
       printf("MW:%d\n", *maxElementWidth);
     } else {
       printf("MW:?\n");
     }
   }
 #endif
   return NS_OK;
 }
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsLeafBoxFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("LeafBox"), aResult);
 }
 #endif
 nsIAtom*
 nsLeafBoxFrame::GetType() const
 {
   return nsGkAtoms::leafBoxFrame;
 }
 nsresult
 nsLeafBoxFrame::CharacterDataChanged(CharacterDataChangeInfo* aInfo)
 {
   MarkIntrinsicWidthsDirty();
   return nsLeafFrame::CharacterDataChanged(aInfo);
 }
 /* virtual */ nsSize
 nsLeafBoxFrame::GetPrefSize(nsBoxLayoutState& aState)
 {
     return nsBox::GetPrefSize(aState);
 }
 /* virtual */ nsSize
 nsLeafBoxFrame::GetMinSize(nsBoxLayoutState& aState)
 {
     return nsBox::GetMinSize(aState);
 }
 /* virtual */ nsSize
 nsLeafBoxFrame::GetMaxSize(nsBoxLayoutState& aState)
 {
     return nsBox::GetMaxSize(aState);
 }
 /* virtual */ nscoord
 nsLeafBoxFrame::GetFlex(nsBoxLayoutState& aState)
 {
     return nsBox::GetFlex(aState);
 }
 /* virtual */ nscoord
 nsLeafBoxFrame::GetBoxAscent(nsBoxLayoutState& aState)
 {
     return nsBox::GetBoxAscent(aState);
 }
 /* virtual */ void
 nsLeafBoxFrame::MarkIntrinsicWidthsDirty()
 {
   // Don't call base class method, since everything it does is within an
   // IsBoxWrapped check.
 }
 NS_IMETHODIMP
 nsLeafBoxFrame::DoLayout(nsBoxLayoutState& aState)
 {
     return nsBox::DoLayout(aState);
 }

The Tor Browser / annotate

layout/xul/nsLeafBoxFrame.cpp@97036ab72558 (annotated)

layout/xul/nsLeafBoxFrame.cpp