The Tor Browser: layout/svg/nsSVGPathGeometryFrame.cpp@97036ab72558 (annotated)

layout/svg/nsSVGPathGeometryFrame.cpp@97036ab72558 (annotated)

layout/svg/nsSVGPathGeometryFrame.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: 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/. */
 // Main header first:
 #include "nsSVGPathGeometryFrame.h"
 // Keep others in (case-insensitive) order:
 #include "gfxContext.h"
 #include "gfxPlatform.h"
 #include "gfxSVGGlyphs.h"
 #include "nsDisplayList.h"
 #include "nsGkAtoms.h"
 #include "nsRenderingContext.h"
 #include "nsSVGEffects.h"
 #include "nsSVGIntegrationUtils.h"
 #include "nsSVGMarkerFrame.h"
 #include "nsSVGPathGeometryElement.h"
 #include "nsSVGUtils.h"
 #include "mozilla/ArrayUtils.h"
 #include "SVGAnimatedTransformList.h"
 #include "SVGGraphicsElement.h"
 using namespace mozilla;
 using namespace mozilla::gfx;
 //----------------------------------------------------------------------
 // Implementation
 nsIFrame*
 NS_NewSVGPathGeometryFrame(nsIPresShell* aPresShell,
                            nsStyleContext* aContext)
 {
   return new (aPresShell) nsSVGPathGeometryFrame(aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsSVGPathGeometryFrame)
 //----------------------------------------------------------------------
 // nsQueryFrame methods
 NS_QUERYFRAME_HEAD(nsSVGPathGeometryFrame)
   NS_QUERYFRAME_ENTRY(nsISVGChildFrame)
   NS_QUERYFRAME_ENTRY(nsSVGPathGeometryFrame)
 NS_QUERYFRAME_TAIL_INHERITING(nsSVGPathGeometryFrameBase)
 //----------------------------------------------------------------------
 // Display list item:
 class nsDisplaySVGPathGeometry : public nsDisplayItem {
 public:
   nsDisplaySVGPathGeometry(nsDisplayListBuilder* aBuilder,
                            nsSVGPathGeometryFrame* aFrame)
     : nsDisplayItem(aBuilder, aFrame)
   {
     MOZ_COUNT_CTOR(nsDisplaySVGPathGeometry);
     NS_ABORT_IF_FALSE(aFrame, "Must have a frame!");
   }
 #ifdef NS_BUILD_REFCNT_LOGGING
   virtual ~nsDisplaySVGPathGeometry() {
     MOZ_COUNT_DTOR(nsDisplaySVGPathGeometry);
   }
 #endif
   NS_DISPLAY_DECL_NAME("nsDisplaySVGPathGeometry", TYPE_SVG_PATH_GEOMETRY)
   virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                        HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
   virtual void Paint(nsDisplayListBuilder* aBuilder,
                      nsRenderingContext* aCtx);
 };
 void
 nsDisplaySVGPathGeometry::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                                   HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
 {
   nsSVGPathGeometryFrame *frame = static_cast<nsSVGPathGeometryFrame*>(mFrame);
   nsPoint pointRelativeToReferenceFrame = aRect.Center();
   // ToReferenceFrame() includes frame->GetPosition(), our user space position.
   nsPoint userSpacePt = pointRelativeToReferenceFrame -
                           (ToReferenceFrame() - frame->GetPosition());
   if (frame->GetFrameForPoint(userSpacePt)) {
     aOutFrames->AppendElement(frame);
   }
 }
 void
 nsDisplaySVGPathGeometry::Paint(nsDisplayListBuilder* aBuilder,
                                 nsRenderingContext* aCtx)
 {
   // ToReferenceFrame includes our mRect offset, but painting takes
   // account of that too. To avoid double counting, we subtract that
   // here.
   nsPoint offset = ToReferenceFrame() - mFrame->GetPosition();
   aCtx->PushState();
   aCtx->Translate(offset);
   static_cast<nsSVGPathGeometryFrame*>(mFrame)->PaintSVG(aCtx, nullptr);
   aCtx->PopState();
 }
 //----------------------------------------------------------------------
 // nsIFrame methods
 void
 nsSVGPathGeometryFrame::Init(nsIContent* aContent,
                              nsIFrame* aParent,
                              nsIFrame* aPrevInFlow)
 {
   AddStateBits(aParent->GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD);
   nsSVGPathGeometryFrameBase::Init(aContent, aParent, aPrevInFlow);
 }
 nsresult
 nsSVGPathGeometryFrame::AttributeChanged(int32_t         aNameSpaceID,
                                          nsIAtom*        aAttribute,
                                          int32_t         aModType)
 {
   // We don't invalidate for transform changes (the layers code does that).
   // Also note that SVGTransformableElement::GetAttributeChangeHint will
   // return nsChangeHint_UpdateOverflow for "transform" attribute changes
   // and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
   if (aNameSpaceID == kNameSpaceID_None &&
       (static_cast<nsSVGPathGeometryElement*>
                   (mContent)->AttributeDefinesGeometry(aAttribute))) {
     nsSVGEffects::InvalidateRenderingObservers(this);
     nsSVGUtils::ScheduleReflowSVG(this);
   }
   return NS_OK;
 }
 /* virtual */ void
 nsSVGPathGeometryFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
 {
   nsSVGPathGeometryFrameBase::DidSetStyleContext(aOldStyleContext);
   if (aOldStyleContext) {
     float oldOpacity = aOldStyleContext->PeekStyleDisplay()->mOpacity;
     float newOpacity = StyleDisplay()->mOpacity;
     if (newOpacity != oldOpacity &&
         nsSVGUtils::CanOptimizeOpacity(this)) {
       // nsIFrame::BuildDisplayListForStackingContext() is not going to create an
       // nsDisplayOpacity display list item, so DLBI won't invalidate for us.
       InvalidateFrame();
     }
   }
 }
 nsIAtom *
 nsSVGPathGeometryFrame::GetType() const
 {
   return nsGkAtoms::svgPathGeometryFrame;
 }
 bool
 nsSVGPathGeometryFrame::IsSVGTransformed(gfx::Matrix *aOwnTransform,
                                          gfx::Matrix *aFromParentTransform) const
 {
   bool foundTransform = false;
   // Check if our parent has children-only transforms:
   nsIFrame *parent = GetParent();
   if (parent &&
       parent->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer)) {
     foundTransform = static_cast<nsSVGContainerFrame*>(parent)->
                        HasChildrenOnlyTransform(aFromParentTransform);
   }
   nsSVGElement *content = static_cast<nsSVGElement*>(mContent);
   nsSVGAnimatedTransformList* transformList =
     content->GetAnimatedTransformList();
   if ((transformList && transformList->HasTransform()) ||
       content->GetAnimateMotionTransform()) {
     if (aOwnTransform) {
       *aOwnTransform = gfx::ToMatrix(content->PrependLocalTransformsTo(gfxMatrix(),
                                   nsSVGElement::eUserSpaceToParent));
     }
     foundTransform = true;
   }
   return foundTransform;
 }
 void
 nsSVGPathGeometryFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                          const nsRect&           aDirtyRect,
                                          const nsDisplayListSet& aLists)
 {
   if (!static_cast<const nsSVGElement*>(mContent)->HasValidDimensions()) {
     return;
   }
   aLists.Content()->AppendNewToTop(
     new (aBuilder) nsDisplaySVGPathGeometry(aBuilder, this));
 }
 //----------------------------------------------------------------------
 // nsISVGChildFrame methods
 nsresult
 nsSVGPathGeometryFrame::PaintSVG(nsRenderingContext *aContext,
                                  const nsIntRect *aDirtyRect,
                                  nsIFrame* aTransformRoot)
 {
   if (!StyleVisibility()->IsVisible())
     return NS_OK;
   uint32_t paintOrder = StyleSVG()->mPaintOrder;
   if (paintOrder == NS_STYLE_PAINT_ORDER_NORMAL) {
     Render(aContext, eRenderFill | eRenderStroke, aTransformRoot);
     PaintMarkers(aContext);
   } else {
     while (paintOrder) {
       uint32_t component =
         paintOrder & ((1 << NS_STYLE_PAINT_ORDER_BITWIDTH) - 1);
       switch (component) {
         case NS_STYLE_PAINT_ORDER_FILL:
           Render(aContext, eRenderFill, aTransformRoot);
           break;
         case NS_STYLE_PAINT_ORDER_STROKE:
           Render(aContext, eRenderStroke, aTransformRoot);
           break;
         case NS_STYLE_PAINT_ORDER_MARKERS:
           PaintMarkers(aContext);
           break;
       }
       paintOrder >>= NS_STYLE_PAINT_ORDER_BITWIDTH;
     }
   }
   return NS_OK;
 }
 nsIFrame*
 nsSVGPathGeometryFrame::GetFrameForPoint(const nsPoint &aPoint)
 {
   gfxMatrix canvasTM = GetCanvasTM(FOR_HIT_TESTING);
   if (canvasTM.IsSingular()) {
     return nullptr;
   }
   uint16_t fillRule, hitTestFlags;
   if (GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD) {
     hitTestFlags = SVG_HIT_TEST_FILL;
     fillRule = StyleSVG()->mClipRule;
   } else {
     hitTestFlags = GetHitTestFlags();
     // XXX once bug 614732 is fixed, aPoint won't need any conversion in order
     // to compare it with mRect.
     nsPoint point =
       nsSVGUtils::TransformOuterSVGPointToChildFrame(aPoint, canvasTM, PresContext());
     if (!hitTestFlags || ((hitTestFlags & SVG_HIT_TEST_CHECK_MRECT) &&
                           !mRect.Contains(point)))
       return nullptr;
     fillRule = StyleSVG()->mFillRule;
   }
   bool isHit = false;
   nsRefPtr<gfxContext> tmpCtx =
     new gfxContext(gfxPlatform::GetPlatform()->ScreenReferenceSurface());
   GeneratePath(tmpCtx, ToMatrix(canvasTM));
   gfxPoint userSpacePoint =
     tmpCtx->DeviceToUser(gfxPoint(PresContext()->AppUnitsToGfxUnits(aPoint.x),
                                   PresContext()->AppUnitsToGfxUnits(aPoint.y)));
   if (fillRule == NS_STYLE_FILL_RULE_EVENODD)
     tmpCtx->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
   else
     tmpCtx->SetFillRule(gfxContext::FILL_RULE_WINDING);
   if (hitTestFlags & SVG_HIT_TEST_FILL)
     isHit = tmpCtx->PointInFill(userSpacePoint);
   if (!isHit && (hitTestFlags & SVG_HIT_TEST_STROKE)) {
     nsSVGUtils::SetupCairoStrokeGeometry(this, tmpCtx);
     // tmpCtx's matrix may have transformed by SetupCairoStrokeGeometry
     // if there is a non-scaling stroke. We need to transform userSpacePoint
     // so that everything is using the same co-ordinate system.
     userSpacePoint =
       nsSVGUtils::GetStrokeTransform(this).Invert().Transform(userSpacePoint);
     isHit = tmpCtx->PointInStroke(userSpacePoint);
   }
   if (isHit && nsSVGUtils::HitTestClip(this, aPoint))
     return this;
   return nullptr;
 }
 nsRect
 nsSVGPathGeometryFrame::GetCoveredRegion()
 {
   return nsSVGUtils::TransformFrameRectToOuterSVG(
            mRect, GetCanvasTM(FOR_OUTERSVG_TM), PresContext());
 }
 void
 nsSVGPathGeometryFrame::ReflowSVG()
 {
   NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
                "This call is probably a wasteful mistake");
   NS_ABORT_IF_FALSE(!(GetStateBits() & NS_FRAME_IS_NONDISPLAY),
                     "ReflowSVG mechanism not designed for this");
   if (!nsSVGUtils::NeedsReflowSVG(this)) {
     return;
   }
   uint32_t flags = nsSVGUtils::eBBoxIncludeFill |
                    nsSVGUtils::eBBoxIncludeStroke |
                    nsSVGUtils::eBBoxIncludeMarkers;
   // Our "visual" overflow rect needs to be valid for building display lists
   // for hit testing, which means that for certain values of 'pointer-events'
   // it needs to include the geometry of the fill or stroke even when the fill/
   // stroke don't actually render (e.g. when stroke="none" or
   // stroke-opacity="0"). GetHitTestFlags() accounts for 'pointer-events'.
   uint16_t hitTestFlags = GetHitTestFlags();
   if ((hitTestFlags & SVG_HIT_TEST_FILL)) {
    flags |= nsSVGUtils::eBBoxIncludeFillGeometry;
   }
   if ((hitTestFlags & SVG_HIT_TEST_STROKE)) {
    flags |= nsSVGUtils::eBBoxIncludeStrokeGeometry;
   }
   // We'd like to just pass the identity matrix to GetBBoxContribution, but if
   // this frame's user space size is _very_ large/small then the extents we
   // obtain below might have overflowed or otherwise be broken. This would
   // cause us to end up with a broken mRect and visual overflow rect and break
   // painting of this frame. This is particularly noticeable if the transforms
   // between us and our nsSVGOuterSVGFrame scale this frame to a reasonable
   // size. To avoid this we sadly have to do extra work to account for the
   // transforms between us and our nsSVGOuterSVGFrame, even though the
   // overwhelming number of SVGs will never have this problem.
   // XXX Will Azure eventually save us from having to do this?
   gfxSize scaleFactors = GetCanvasTM(FOR_OUTERSVG_TM).ScaleFactors(true);
   bool applyScaling = fabs(scaleFactors.width) >= 1e-6 &&
                       fabs(scaleFactors.height) >= 1e-6;
   gfx::Matrix scaling;
   if (applyScaling) {
     scaling.Scale(scaleFactors.width, scaleFactors.height);
   }
   gfxRect extent = GetBBoxContribution(scaling, flags).ToThebesRect();
   if (applyScaling) {
     extent.Scale(1 / scaleFactors.width, 1 / scaleFactors.height);
   }
   mRect = nsLayoutUtils::RoundGfxRectToAppRect(extent,
             PresContext()->AppUnitsPerCSSPixel());
   if (mState & NS_FRAME_FIRST_REFLOW) {
     // Make sure we have our filter property (if any) before calling
     // FinishAndStoreOverflow (subsequent filter changes are handled off
     // nsChangeHint_UpdateEffects):
     nsSVGEffects::UpdateEffects(this);
   }
   nsRect overflow = nsRect(nsPoint(0,0), mRect.Size());
   nsOverflowAreas overflowAreas(overflow, overflow);
   FinishAndStoreOverflow(overflowAreas, mRect.Size());
   mState &= ~(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
               NS_FRAME_HAS_DIRTY_CHILDREN);
   // Invalidate, but only if this is not our first reflow (since if it is our
   // first reflow then we haven't had our first paint yet).
   if (!(GetParent()->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
     InvalidateFrame();
   }
 }
 void
 nsSVGPathGeometryFrame::NotifySVGChanged(uint32_t aFlags)
 {
   NS_ABORT_IF_FALSE(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
                     "Invalidation logic may need adjusting");
   // Changes to our ancestors may affect how we render when we are rendered as
   // part of our ancestor (specifically, if our coordinate context changes size
   // and we have percentage lengths defining our geometry, then we need to be
   // reflowed). However, ancestor changes cannot affect how we render when we
   // are rendered as part of any rendering observers that we may have.
   // Therefore no need to notify rendering observers here.
   // Don't try to be too smart trying to avoid the ScheduleReflowSVG calls
   // for the stroke properties examined below. Checking HasStroke() is not
   // enough, since what we care about is whether we include the stroke in our
   // overflow rects or not, and we sometimes deliberately include stroke
   // when it's not visible. See the complexities of GetBBoxContribution.
   if (aFlags & COORD_CONTEXT_CHANGED) {
     // Stroke currently contributes to our mRect, which is why we have to take
     // account of stroke-width here. Note that we do not need to take account
     // of stroke-dashoffset since, although that can have a percentage value
     // that is resolved against our coordinate context, it does not affect our
     // mRect.
     if (static_cast<nsSVGPathGeometryElement*>(mContent)->GeometryDependsOnCoordCtx() ||
         StyleSVG()->mStrokeWidth.HasPercent()) {
       nsSVGUtils::ScheduleReflowSVG(this);
     }
   }
   if ((aFlags & TRANSFORM_CHANGED) &&
       StyleSVGReset()->mVectorEffect ==
         NS_STYLE_VECTOR_EFFECT_NON_SCALING_STROKE) {
     // Stroke currently contributes to our mRect, and our stroke depends on
     // the transform to our outer-<svg> if |vector-effect:non-scaling-stroke|.
     nsSVGUtils::ScheduleReflowSVG(this);
   }
 }
 SVGBBox
 nsSVGPathGeometryFrame::GetBBoxContribution(const Matrix &aToBBoxUserspace,
                                             uint32_t aFlags)
 {
   SVGBBox bbox;
   if (aToBBoxUserspace.IsSingular()) {
     // XXX ReportToConsole
     return bbox;
   }
   nsRefPtr<gfxContext> tmpCtx =
     new gfxContext(gfxPlatform::GetPlatform()->ScreenReferenceSurface());
   GeneratePath(tmpCtx, aToBBoxUserspace);
   tmpCtx->IdentityMatrix();
   // Be careful when replacing the following logic to get the fill and stroke
   // extents independently (instead of computing the stroke extents from the
   // path extents). You may think that you can just use the stroke extents if
   // there is both a fill and a stroke. In reality it's necessary to calculate
   // both the fill and stroke extents, and take the union of the two. There are
   // two reasons for this:
   //
   // # Due to stroke dashing, in certain cases the fill extents could actually
   //   extend outside the stroke extents.
   // # If the stroke is very thin, cairo won't paint any stroke, and so the
   //   stroke bounds that it will return will be empty.
   gfxRect pathExtents = tmpCtx->GetUserPathExtent();
   // Account for fill:
   if ((aFlags & nsSVGUtils::eBBoxIncludeFillGeometry) ||
       ((aFlags & nsSVGUtils::eBBoxIncludeFill) &&
        StyleSVG()->mFill.mType != eStyleSVGPaintType_None)) {
     bbox = pathExtents;
   }
   // Account for stroke:
   if ((aFlags & nsSVGUtils::eBBoxIncludeStrokeGeometry) ||
       ((aFlags & nsSVGUtils::eBBoxIncludeStroke) &&
        nsSVGUtils::HasStroke(this))) {
     // We can't use tmpCtx->GetUserStrokeExtent() since it doesn't work for
     // device space extents. Instead we approximate the stroke extents from
     // pathExtents using PathExtentsToMaxStrokeExtents.
     if (pathExtents.Width() <= 0 && pathExtents.Height() <= 0) {
       // We have a zero length path, but it may still have non-empty stroke
       // bounds depending on the value of stroke-linecap. We need to fix up
       // pathExtents before it can be used with PathExtentsToMaxStrokeExtents
       // though, because if pathExtents is empty, its position will not have
       // been set. Happily we can use tmpCtx->GetUserStrokeExtent() to find
       // the center point of the extents even though it gets the extents wrong.
       nsSVGUtils::SetupCairoStrokeBBoxGeometry(this, tmpCtx);
       pathExtents.MoveTo(tmpCtx->GetUserStrokeExtent().Center());
       pathExtents.SizeTo(0, 0);
     }
     bbox.UnionEdges(nsSVGUtils::PathExtentsToMaxStrokeExtents(pathExtents,
                                                               this,
                                                               ThebesMatrix(aToBBoxUserspace)));
   }
   // Account for markers:
   if ((aFlags & nsSVGUtils::eBBoxIncludeMarkers) != 0 &&
       static_cast<nsSVGPathGeometryElement*>(mContent)->IsMarkable()) {
     float strokeWidth = nsSVGUtils::GetStrokeWidth(this);
     MarkerProperties properties = GetMarkerProperties(this);
     if (properties.MarkersExist()) {
       nsTArray<nsSVGMark> marks;
       static_cast<nsSVGPathGeometryElement*>(mContent)->GetMarkPoints(&marks);
       uint32_t num = marks.Length();
       // These are in the same order as the nsSVGMark::Type constants.
       nsSVGMarkerFrame* markerFrames[] = {
         properties.GetMarkerStartFrame(),
         properties.GetMarkerMidFrame(),
         properties.GetMarkerEndFrame(),
       };
       PR_STATIC_ASSERT(MOZ_ARRAY_LENGTH(markerFrames) == nsSVGMark::eTypeCount);
       for (uint32_t i = 0; i < num; i++) {
         nsSVGMark& mark = marks[i];
         nsSVGMarkerFrame* frame = markerFrames[mark.type];
         if (frame) {
           SVGBBox mbbox =
             frame->GetMarkBBoxContribution(aToBBoxUserspace, aFlags, this,
                                            &marks[i], strokeWidth);
           bbox.UnionEdges(mbbox);
         }
       }
     }
   }
   return bbox;
 }
 //----------------------------------------------------------------------
 // nsSVGPathGeometryFrame methods:
 gfxMatrix
 nsSVGPathGeometryFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot)
 {
   if (!(GetStateBits() & NS_FRAME_IS_NONDISPLAY) && !aTransformRoot) {
     if ((aFor == FOR_PAINTING && NS_SVGDisplayListPaintingEnabled()) ||
         (aFor == FOR_HIT_TESTING && NS_SVGDisplayListHitTestingEnabled())) {
       return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(this);
     }
   }
   NS_ASSERTION(mParent, "null parent");
   nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
   dom::SVGGraphicsElement *content = static_cast<dom::SVGGraphicsElement*>(mContent);
   return content->PrependLocalTransformsTo(
       this == aTransformRoot ? gfxMatrix() :
                                parent->GetCanvasTM(aFor, aTransformRoot));
 }
 nsSVGPathGeometryFrame::MarkerProperties
 nsSVGPathGeometryFrame::GetMarkerProperties(nsSVGPathGeometryFrame *aFrame)
 {
   NS_ASSERTION(!aFrame->GetPrevContinuation(), "aFrame should be first continuation");
   MarkerProperties result;
   const nsStyleSVG *style = aFrame->StyleSVG();
   result.mMarkerStart =
     nsSVGEffects::GetMarkerProperty(style->mMarkerStart, aFrame,
                                     nsSVGEffects::MarkerBeginProperty());
   result.mMarkerMid =
     nsSVGEffects::GetMarkerProperty(style->mMarkerMid, aFrame,
                                     nsSVGEffects::MarkerMiddleProperty());
   result.mMarkerEnd =
     nsSVGEffects::GetMarkerProperty(style->mMarkerEnd, aFrame,
                                     nsSVGEffects::MarkerEndProperty());
   return result;
 }
 nsSVGMarkerFrame *
 nsSVGPathGeometryFrame::MarkerProperties::GetMarkerStartFrame()
 {
   if (!mMarkerStart)
     return nullptr;
   return static_cast<nsSVGMarkerFrame *>
     (mMarkerStart->GetReferencedFrame(nsGkAtoms::svgMarkerFrame, nullptr));
 }
 nsSVGMarkerFrame *
 nsSVGPathGeometryFrame::MarkerProperties::GetMarkerMidFrame()
 {
   if (!mMarkerMid)
     return nullptr;
   return static_cast<nsSVGMarkerFrame *>
     (mMarkerMid->GetReferencedFrame(nsGkAtoms::svgMarkerFrame, nullptr));
 }
 nsSVGMarkerFrame *
 nsSVGPathGeometryFrame::MarkerProperties::GetMarkerEndFrame()
 {
   if (!mMarkerEnd)
     return nullptr;
   return static_cast<nsSVGMarkerFrame *>
     (mMarkerEnd->GetReferencedFrame(nsGkAtoms::svgMarkerFrame, nullptr));
 }
 void
 nsSVGPathGeometryFrame::Render(nsRenderingContext *aContext,
                                uint32_t aRenderComponents,
                                nsIFrame* aTransformRoot)
 {
   gfxContext *gfx = aContext->ThebesContext();
   uint16_t renderMode = SVGAutoRenderState::GetRenderMode(aContext);
   switch (StyleSVG()->mShapeRendering) {
   case NS_STYLE_SHAPE_RENDERING_OPTIMIZESPEED:
   case NS_STYLE_SHAPE_RENDERING_CRISPEDGES:
     gfx->SetAntialiasMode(gfxContext::MODE_ALIASED);
     break;
   default:
     gfx->SetAntialiasMode(gfxContext::MODE_COVERAGE);
     break;
   }
   if (renderMode != SVGAutoRenderState::NORMAL) {
     NS_ABORT_IF_FALSE(renderMode == SVGAutoRenderState::CLIP ||
                       renderMode == SVGAutoRenderState::CLIP_MASK,
                       "Unknown render mode");
     // In the case that |renderMode == SVGAutoRenderState::CLIP| then we don't
     // use the path we generate here until further up the call stack when
     // nsSVGClipPathFrame::Clip calls gfxContext::Clip. That's a problem for
     // Moz2D which emits paths in user space (unlike cairo which emits paths in
     // device space). gfxContext has hacks to deal with code changing the
     // transform then using the current path when it is backed by Moz2D, but
     // Moz2D itself does not since that would fundamentally go against its API.
     // Therefore we do not want to Save()/Restore() the gfxContext here in the
     // SVGAutoRenderState::CLIP case since that would block us from killing off
     // gfxContext and using Moz2D directly. Not bothering to Save()/Restore()
     // is actually okay, since we know that doesn't matter in the
     // SVGAutoRenderState::CLIP case (at least for the current implementation).
     gfxContextMatrixAutoSaveRestore autoSaveRestore;
     // For now revent back to doing the save even for CLIP to fix bug 959128.
     // Undo in bug 987193.
     //if (renderMode != SVGAutoRenderState::CLIP) {
       autoSaveRestore.SetContext(gfx);
     //}
     GeneratePath(gfx, ToMatrix(GetCanvasTM(FOR_PAINTING, aTransformRoot)));
     // We used to call gfx->Restore() here, since for the
     // SVGAutoRenderState::CLIP case it is important to leave the fill rule
     // that we set below untouched so that the value is still set when return
     // to gfxContext::Clip() further up the call stack. Since we no longer
     // call gfx->Save() in the SVGAutoRenderState::CLIP case we don't need to
     // worry that autoSaveRestore will delay the Restore() call for the
     // CLIP_MASK case until we exit this function.
     gfxContext::FillRule oldFillRull = gfx->CurrentFillRule();
     if (StyleSVG()->mClipRule == NS_STYLE_FILL_RULE_EVENODD)
       gfx->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
     else
       gfx->SetFillRule(gfxContext::FILL_RULE_WINDING);
     if (renderMode == SVGAutoRenderState::CLIP_MASK) {
       gfx->SetColor(gfxRGBA(1.0f, 1.0f, 1.0f, 1.0f));
       gfx->Fill();
       gfx->SetFillRule(oldFillRull); // restore, but only for CLIP_MASK
       gfx->NewPath();
     }
     return;
   }
   gfxContextAutoSaveRestore autoSaveRestore(gfx);
   GeneratePath(gfx, ToMatrix(GetCanvasTM(FOR_PAINTING, aTransformRoot)));
   gfxTextContextPaint *contextPaint =
     (gfxTextContextPaint*)aContext->GetUserData(&gfxTextContextPaint::sUserDataKey);
   if ((aRenderComponents & eRenderFill) &&
       nsSVGUtils::SetupCairoFillPaint(this, gfx, contextPaint)) {
     gfx->Fill();
   }
   if ((aRenderComponents & eRenderStroke) &&
        nsSVGUtils::SetupCairoStroke(this, gfx, contextPaint)) {
     gfx->Stroke();
   }
   gfx->NewPath();
 }
 void
 nsSVGPathGeometryFrame::GeneratePath(gfxContext* aContext,
                                      const Matrix &aTransform)
 {
   if (aTransform.IsSingular()) {
     aContext->IdentityMatrix();
     aContext->NewPath();
     return;
   }
   aContext->MultiplyAndNudgeToIntegers(ThebesMatrix(aTransform));
   // Hack to let SVGPathData::ConstructPath know if we have square caps:
   const nsStyleSVG* style = StyleSVG();
   if (style->mStrokeLinecap == NS_STYLE_STROKE_LINECAP_SQUARE) {
     aContext->SetLineCap(gfxContext::LINE_CAP_SQUARE);
   }
   aContext->NewPath();
   static_cast<nsSVGPathGeometryElement*>(mContent)->ConstructPath(aContext);
 }
 void
 nsSVGPathGeometryFrame::PaintMarkers(nsRenderingContext* aContext)
 {
   gfxTextContextPaint *contextPaint =
     (gfxTextContextPaint*)aContext->GetUserData(&gfxTextContextPaint::sUserDataKey);
   if (static_cast<nsSVGPathGeometryElement*>(mContent)->IsMarkable()) {
     MarkerProperties properties = GetMarkerProperties(this);
     if (properties.MarkersExist()) {
       float strokeWidth = nsSVGUtils::GetStrokeWidth(this, contextPaint);
       nsTArray<nsSVGMark> marks;
       static_cast<nsSVGPathGeometryElement*>
                  (mContent)->GetMarkPoints(&marks);
       uint32_t num = marks.Length();
       if (num) {
         // These are in the same order as the nsSVGMark::Type constants.
         nsSVGMarkerFrame* markerFrames[] = {
           properties.GetMarkerStartFrame(),
           properties.GetMarkerMidFrame(),
           properties.GetMarkerEndFrame(),
         };
         PR_STATIC_ASSERT(MOZ_ARRAY_LENGTH(markerFrames) == nsSVGMark::eTypeCount);
         for (uint32_t i = 0; i < num; i++) {
           nsSVGMark& mark = marks[i];
           nsSVGMarkerFrame* frame = markerFrames[mark.type];
           if (frame) {
             frame->PaintMark(aContext, this, &mark, strokeWidth);
           }
         }
       }
     }
   }
 }
 uint16_t
 nsSVGPathGeometryFrame::GetHitTestFlags()
 {
   return nsSVGUtils::GetGeometryHitTestFlags(this);
 }

The Tor Browser / annotate

layout/svg/nsSVGPathGeometryFrame.cpp@97036ab72558 (annotated)

layout/svg/nsSVGPathGeometryFrame.cpp