bool LayoutSVGResourceClipper::hitTestClipContent(const FloatRect& objectBoundingBox, const FloatPoint& nodeAtPoint)
{
    FloatPoint point = nodeAtPoint;
    if (!SVGLayoutSupport::pointInClippingArea(this, point))
        return false;

    if (clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
        AffineTransform transform;
        transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
        transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
        point = transform.inverse().mapPoint(point);
    }

    AffineTransform animatedLocalTransform = toSVGClipPathElement(element())->calculateAnimatedLocalTransform();
    if (!animatedLocalTransform.isInvertible())
        return false;

    point = animatedLocalTransform.inverse().mapPoint(point);

    for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
        LayoutObject* layoutObject = childElement->layoutObject();
        if (!layoutObject)
            continue;
        if (!layoutObject->isSVGShape() && !layoutObject->isSVGText() && !isSVGUseElement(*childElement))
            continue;
        IntPoint hitPoint;
        HitTestResult result(HitTestRequest::SVGClipContent, hitPoint);
        if (layoutObject->nodeAtFloatPoint(result, point, HitTestForeground))
            return true;
    }

    return false;
}
bool RenderSVGResourceClipper::hitTestClipContent(const FloatRect& objectBoundingBox, const FloatPoint& nodeAtPoint)
{
    FloatPoint point = nodeAtPoint;
    if (!SVGRenderSupport::pointInClippingArea(this, point))
        return false;

    SVGClipPathElement* clipPathElement = toSVGClipPathElement(element());
    if (clipPathElement->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
        AffineTransform transform;
        transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
        transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
        point = transform.inverse().mapPoint(point);
    }

    point = clipPathElement->animatedLocalTransform().inverse().mapPoint(point);

    for (Node* childNode = element()->firstChild(); childNode; childNode = childNode->nextSibling()) {
        RenderObject* renderer = childNode->renderer();
        if (!childNode->isSVGElement() || !renderer)
            continue;
        if (!renderer->isSVGShape() && !renderer->isSVGText() && !childNode->hasTagName(SVGNames::useTag))
            continue;
        IntPoint hitPoint;
        HitTestResult result(hitPoint);
        if (renderer->nodeAtFloatPoint(HitTestRequest(HitTestRequest::SVGClipContent | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent), result, point, HitTestForeground))
            return true;
    }

    return false;
}
示例#3
0
bool LayoutSVGResourceClipper::hitTestClipContent(
    const FloatRect& objectBoundingBox,
    const FloatPoint& nodeAtPoint) {
  FloatPoint point = nodeAtPoint;
  if (!SVGLayoutSupport::pointInClippingArea(*this, point))
    return false;

  if (clipPathUnits() == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) {
    AffineTransform transform;
    transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
    transform.scaleNonUniform(objectBoundingBox.width(),
                              objectBoundingBox.height());
    point = transform.inverse().mapPoint(point);
  }

  AffineTransform animatedLocalTransform =
      toSVGClipPathElement(element())->calculateTransform(
          SVGElement::IncludeMotionTransform);
  if (!animatedLocalTransform.isInvertible())
    return false;

  point = animatedLocalTransform.inverse().mapPoint(point);

  for (const SVGElement& childElement :
       Traversal<SVGElement>::childrenOf(*element())) {
    if (!contributesToClip(childElement))
      continue;
    IntPoint hitPoint;
    HitTestResult result(HitTestRequest::SVGClipContent, hitPoint);
    LayoutObject* layoutObject = childElement.layoutObject();
    if (layoutObject->nodeAtFloatPoint(result, point, HitTestForeground))
      return true;
  }
  return false;
}
示例#4
0
bool SVGClipPainter::applyClippingToContext(const LayoutObject& target, const FloatRect& targetBoundingBox,
    const FloatRect& paintInvalidationRect, GraphicsContext* context, ClipperState& clipperState)
{
    ASSERT(context);
    ASSERT(clipperState == ClipperNotApplied);
    ASSERT_WITH_SECURITY_IMPLICATION(!m_clip.needsLayout());

    if (paintInvalidationRect.isEmpty() || m_clip.hasCycle())
        return false;

    SVGClipExpansionCycleHelper inClipExpansionChange(m_clip);

    AffineTransform animatedLocalTransform = toSVGClipPathElement(m_clip.element())->calculateAnimatedLocalTransform();
    // When drawing a clip for non-SVG elements, the CTM does not include the zoom factor.
    // In this case, we need to apply the zoom scale explicitly - but only for clips with
    // userSpaceOnUse units (the zoom is accounted for objectBoundingBox-resolved lengths).
    if (!target.isSVG() && m_clip.clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) {
        ASSERT(m_clip.style());
        animatedLocalTransform.scale(m_clip.style()->effectiveZoom());
    }

    // First, try to apply the clip as a clipPath.
    if (m_clip.tryPathOnlyClipping(target, context, animatedLocalTransform, targetBoundingBox)) {
        clipperState = ClipperAppliedPath;
        return true;
    }

    // Fall back to masking.
    clipperState = ClipperAppliedMask;

    // Begin compositing the clip mask.
    CompositingRecorder::beginCompositing(*context, target, SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect);
    {
        TransformRecorder recorder(*context, target, animatedLocalTransform);

        // clipPath can also be clipped by another clipPath.
        SVGResources* resources = SVGResourcesCache::cachedResourcesForLayoutObject(&m_clip);
        LayoutSVGResourceClipper* clipPathClipper = resources ? resources->clipper() : 0;
        ClipperState clipPathClipperState = ClipperNotApplied;
        if (clipPathClipper && !SVGClipPainter(*clipPathClipper).applyClippingToContext(m_clip, targetBoundingBox, paintInvalidationRect, context, clipPathClipperState)) {
            // End the clip mask's compositor.
            CompositingRecorder::endCompositing(*context, target);
            return false;
        }

        drawClipMaskContent(context, target, targetBoundingBox);

        if (clipPathClipper)
            SVGClipPainter(*clipPathClipper).postApplyStatefulResource(m_clip, context, clipPathClipperState);
    }

    // Masked content layer start.
    CompositingRecorder::beginCompositing(*context, target, SkXfermode::kSrcIn_Mode, 1, &paintInvalidationRect);

    return true;
}
bool RenderSVGResourceClipper::applyClippingToContext(RenderObject* target, const FloatRect& targetBoundingBox,
    const FloatRect& repaintRect, GraphicsContext* context, ClipperContext& clipperContext)
{
    ASSERT(target);
    ASSERT(context);
    ASSERT(clipperContext.state == ClipperContext::NotAppliedState);
    ASSERT_WITH_SECURITY_IMPLICATION(!needsLayout());

    if (repaintRect.isEmpty() || m_inClipExpansion)
        return false;
    TemporaryChange<bool> inClipExpansionChange(m_inClipExpansion, true);

    // First, try to apply the clip as a clipPath.
    AffineTransform animatedLocalTransform = toSVGClipPathElement(element())->animatedLocalTransform();
    if (tryPathOnlyClipping(context, animatedLocalTransform, targetBoundingBox)) {
        clipperContext.state = ClipperContext::AppliedPathState;
        return true;
    }

    // Fall back to masking.
    clipperContext.state = ClipperContext::AppliedMaskState;

    // Mask layer start
    context->beginTransparencyLayer(1, &repaintRect);
    {
        GraphicsContextStateSaver maskContentSaver(*context);
        context->concatCTM(animatedLocalTransform);

        // clipPath can also be clipped by another clipPath.
        SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
        RenderSVGResourceClipper* clipPathClipper = 0;
        ClipperContext clipPathClipperContext;
        if (resources && (clipPathClipper = resources->clipper())) {
            if (!clipPathClipper->applyClippingToContext(this, targetBoundingBox, repaintRect, context, clipPathClipperContext)) {
                // FIXME: Awkward state micro-management. Ideally, GraphicsContextStateSaver should
                //   a) pop saveLayers also
                //   b) pop multiple states if needed (similarly to SkCanvas::restoreToCount())
                // Then we should be able to replace this mess with a single, top-level GCSS.
                maskContentSaver.restore();
                context->restoreLayer();
                return false;
            }
        }

        drawClipMaskContent(context, targetBoundingBox);

        if (clipPathClipper)
            clipPathClipper->postApplyStatefulResource(this, context, clipPathClipperContext);
    }

    // Masked content layer start.
    context->beginLayer(1, CompositeSourceIn, &repaintRect);

    return true;
}
bool SVGClipPainter::prepareEffect(const LayoutObject& target, const FloatRect& targetBoundingBox,
    const FloatRect& paintInvalidationRect, GraphicsContext& context, ClipperState& clipperState)
{
    ASSERT(clipperState == ClipperNotApplied);
    ASSERT_WITH_SECURITY_IMPLICATION(!m_clip.needsLayout());

    m_clip.clearInvalidationMask();

    if (paintInvalidationRect.isEmpty() || m_clip.hasCycle())
        return false;

    SVGClipExpansionCycleHelper inClipExpansionChange(m_clip);

    AffineTransform animatedLocalTransform = toSVGClipPathElement(m_clip.element())->calculateAnimatedLocalTransform();
    // When drawing a clip for non-SVG elements, the CTM does not include the zoom factor.
    // In this case, we need to apply the zoom scale explicitly - but only for clips with
    // userSpaceOnUse units (the zoom is accounted for objectBoundingBox-resolved lengths).
    if (!target.isSVG() && m_clip.clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) {
        ASSERT(m_clip.style());
        animatedLocalTransform.scale(m_clip.style()->effectiveZoom());
    }

    // First, try to apply the clip as a clipPath.
    Path clipPath;
    if (m_clip.asPath(animatedLocalTransform, targetBoundingBox, clipPath)) {
        clipperState = ClipperAppliedPath;
        context.getPaintController().createAndAppend<BeginClipPathDisplayItem>(target, clipPath);
        return true;
    }

    // Fall back to masking.
    clipperState = ClipperAppliedMask;

    // Begin compositing the clip mask.
    CompositingRecorder::beginCompositing(context, target, SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect);
    {
        if (!drawClipAsMask(context, target, targetBoundingBox, paintInvalidationRect, animatedLocalTransform)) {
            // End the clip mask's compositor.
            CompositingRecorder::endCompositing(context, target);
            return false;
        }
    }

    // Masked content layer start.
    CompositingRecorder::beginCompositing(context, target, SkXfermode::kSrcIn_Mode, 1, &paintInvalidationRect);

    return true;
}
void LayoutSVGResourceClipper::calculateClipContentPaintInvalidationRect()
{
    // This is a rough heuristic to appraise the clip size and doesn't consider clip on clip.
    for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
        LayoutObject* layoutObject = childElement->layoutObject();
        if (!layoutObject)
            continue;
        if (!layoutObject->isSVGShape() && !layoutObject->isSVGText() && !isSVGUseElement(*childElement))
            continue;
        const ComputedStyle* style = layoutObject->style();
        if (!style || style->display() == NONE || style->visibility() != VISIBLE)
            continue;
        m_clipBoundaries.unite(layoutObject->localToParentTransform().mapRect(layoutObject->paintInvalidationRectInLocalCoordinates()));
    }
    m_clipBoundaries = toSVGClipPathElement(element())->calculateAnimatedLocalTransform().mapRect(m_clipBoundaries);
}
void RenderSVGResourceClipper::calculateClipContentRepaintRect()
{
    // This is a rough heuristic to appraise the clip size and doesn't consider clip on clip.
    for (Node* childNode = element()->firstChild(); childNode; childNode = childNode->nextSibling()) {
        RenderObject* renderer = childNode->renderer();
        if (!childNode->isSVGElement() || !renderer)
            continue;
        if (!renderer->isSVGShape() && !renderer->isSVGText() && !childNode->hasTagName(SVGNames::useTag))
            continue;
        RenderStyle* style = renderer->style();
        if (!style || style->display() == NONE || style->visibility() != VISIBLE)
             continue;
        m_clipBoundaries.unite(renderer->localToParentTransform().mapRect(renderer->repaintRectInLocalCoordinates()));
    }
    m_clipBoundaries = toSVGClipPathElement(element())->animatedLocalTransform().mapRect(m_clipBoundaries);
}
示例#9
0
FloatRect LayoutSVGResourceClipper::resourceBoundingBox(
    const FloatRect& referenceBox) {
  // The resource has not been layouted yet. Return the reference box.
  if (selfNeedsLayout())
    return referenceBox;

  if (m_localClipBounds.isEmpty())
    calculateLocalClipBounds();

  AffineTransform transform =
      toSVGClipPathElement(element())->calculateTransform(
          SVGElement::IncludeMotionTransform);
  if (clipPathUnits() == SVGUnitTypes::kSvgUnitTypeObjectboundingbox) {
    transform.translate(referenceBox.x(), referenceBox.y());
    transform.scaleNonUniform(referenceBox.width(), referenceBox.height());
  }
  return transform.mapRect(m_localClipBounds);
}
void RenderSVGResourceClipper::drawClipMaskContent(GraphicsContext* context, const FloatRect& targetBoundingBox)
{
    ASSERT(context);

    AffineTransform contentTransformation;
    SVGUnitTypes::SVGUnitType contentUnits = toSVGClipPathElement(element())->clipPathUnitsCurrentValue();
    if (contentUnits == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
        contentTransformation.translate(targetBoundingBox.x(), targetBoundingBox.y());
        contentTransformation.scaleNonUniform(targetBoundingBox.width(), targetBoundingBox.height());
        context->concatCTM(contentTransformation);
    }

    if (!m_clipContentDisplayList)
        m_clipContentDisplayList = asDisplayList(context, contentTransformation);

    ASSERT(m_clipContentDisplayList);
    context->drawDisplayList(m_clipContentDisplayList.get());
}
FloatRect RenderSVGResourceClipper::resourceBoundingBox(RenderObject* object)
{
    // Resource was not layouted yet. Give back the boundingBox of the object.
    if (selfNeedsLayout())
        return object->objectBoundingBox();

    if (m_clipBoundaries.isEmpty())
        calculateClipContentRepaintRect();

    if (toSVGClipPathElement(element())->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
        FloatRect objectBoundingBox = object->objectBoundingBox();
        AffineTransform transform;
        transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
        transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
        return transform.mapRect(m_clipBoundaries);
    }

    return m_clipBoundaries;
}
bool RenderSVGResourceClipper::applyClippingToContext(RenderObject* target, const FloatRect& targetBoundingBox,
    const FloatRect& paintInvalidationRect, GraphicsContext* context, ClipperState& clipperState)
{
    ASSERT(target);
    ASSERT(context);
    ASSERT(clipperState == ClipperNotApplied);
    ASSERT_WITH_SECURITY_IMPLICATION(!needsLayout());

    if (paintInvalidationRect.isEmpty() || m_inClipExpansion)
        return false;
    TemporaryChange<bool> inClipExpansionChange(m_inClipExpansion, true);

    AffineTransform animatedLocalTransform = toSVGClipPathElement(element())->animatedLocalTransform();
    // When drawing a clip for non-SVG elements, the CTM does not include the zoom factor.
    // In this case, we need to apply the zoom scale explicitly - but only for clips with
    // userSpaceOnUse units (the zoom is accounted for objectBoundingBox-resolved lengths).
    if (!target->isSVG() && clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) {
        ASSERT(style());
        animatedLocalTransform.scale(style()->effectiveZoom());
    }

    // First, try to apply the clip as a clipPath.
    if (tryPathOnlyClipping(context, animatedLocalTransform, targetBoundingBox)) {
        clipperState = ClipperAppliedPath;
        return true;
    }

    // Fall back to masking.
    clipperState = ClipperAppliedMask;

    // Mask layer start
    context->beginTransparencyLayer(1, &paintInvalidationRect);
    {
        GraphicsContextStateSaver maskContentSaver(*context);
        context->concatCTM(animatedLocalTransform);

        // clipPath can also be clipped by another clipPath.
        SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
        RenderSVGResourceClipper* clipPathClipper = resources ? resources->clipper() : 0;
        ClipperState clipPathClipperState = ClipperNotApplied;
        if (clipPathClipper && !clipPathClipper->applyClippingToContext(this, targetBoundingBox, paintInvalidationRect, context, clipPathClipperState)) {
            // FIXME: Awkward state micro-management. Ideally, GraphicsContextStateSaver should
            //   a) pop saveLayers also
            //   b) pop multiple states if needed (similarly to SkCanvas::restoreToCount())
            // Then we should be able to replace this mess with a single, top-level GCSS.
            maskContentSaver.restore();
            context->restoreLayer();
            return false;
        }

        drawClipMaskContent(context, targetBoundingBox);

        if (clipPathClipper)
            clipPathClipper->postApplyStatefulResource(this, context, clipPathClipperState);
    }

    // Masked content layer start.
    context->beginLayer(1, CompositeSourceIn, &paintInvalidationRect);

    return true;
}
示例#13
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bool SVGClipPainter::prepareEffect(const LayoutObject& target,
                                   const FloatRect& targetBoundingBox,
                                   const FloatRect& visualRect,
                                   const FloatPoint& layerPositionOffset,
                                   GraphicsContext& context,
                                   ClipperState& clipperState) {
  DCHECK_EQ(clipperState, ClipperState::NotApplied);
  SECURITY_DCHECK(!m_clip.needsLayout());

  m_clip.clearInvalidationMask();

  if (m_clip.hasCycle())
    return false;

  SVGClipExpansionCycleHelper inClipExpansionChange(m_clip);

  AffineTransform animatedLocalTransform =
      toSVGClipPathElement(m_clip.element())
          ->calculateTransform(SVGElement::IncludeMotionTransform);
  // When drawing a clip for non-SVG elements, the CTM does not include the zoom
  // factor.  In this case, we need to apply the zoom scale explicitly - but
  // only for clips with userSpaceOnUse units (the zoom is accounted for
  // objectBoundingBox-resolved lengths).
  if (!target.isSVG() &&
      m_clip.clipPathUnits() == SVGUnitTypes::kSvgUnitTypeUserspaceonuse) {
    DCHECK(m_clip.style());
    animatedLocalTransform.scale(m_clip.style()->effectiveZoom());
  }

  // First, try to apply the clip as a clipPath.
  Path clipPath;
  if (m_clip.asPath(animatedLocalTransform, targetBoundingBox, clipPath)) {
    AffineTransform positionTransform;
    positionTransform.translate(layerPositionOffset.x(),
                                layerPositionOffset.y());
    clipPath.transform(positionTransform);
    clipperState = ClipperState::AppliedPath;
    context.getPaintController().createAndAppend<BeginClipPathDisplayItem>(
        target, clipPath);
    return true;
  }

  // Fall back to masking.
  clipperState = ClipperState::AppliedMask;

  // Begin compositing the clip mask.
  CompositingRecorder::beginCompositing(context, target, SkBlendMode::kSrcOver,
                                        1, &visualRect);
  {
    if (!drawClipAsMask(context, target, targetBoundingBox, visualRect,
                        animatedLocalTransform, layerPositionOffset)) {
      // End the clip mask's compositor.
      CompositingRecorder::endCompositing(context, target);
      return false;
    }
  }

  // Masked content layer start.
  CompositingRecorder::beginCompositing(context, target, SkBlendMode::kSrcIn, 1,
                                        &visualRect);

  return true;
}
bool RenderSVGResourceClipper::tryPathOnlyClipping(GraphicsContext* context,
    const AffineTransform& animatedLocalTransform, const FloatRect& objectBoundingBox) {
    // If the current clip-path gets clipped itself, we have to fallback to masking.
    if (!style()->svgStyle()->clipperResource().isEmpty())
        return false;
    WindRule clipRule = RULE_NONZERO;
    Path clipPath = Path();

    for (Node* childNode = element()->firstChild(); childNode; childNode = childNode->nextSibling()) {
        RenderObject* renderer = childNode->renderer();
        if (!renderer)
            continue;
        // Only shapes or paths are supported for direct clipping. We need to fallback to masking for texts.
        if (renderer->isSVGText())
            return false;
        if (!childNode->isSVGElement() || !toSVGElement(childNode)->isSVGGraphicsElement())
            continue;
        SVGGraphicsElement* styled = toSVGGraphicsElement(childNode);
        RenderStyle* style = renderer->style();
        if (!style || style->display() == NONE || style->visibility() != VISIBLE)
             continue;
        const SVGRenderStyle* svgStyle = style->svgStyle();
        // Current shape in clip-path gets clipped too. Fallback to masking.
        if (!svgStyle->clipperResource().isEmpty())
            return false;

        if (clipPath.isEmpty()) {
            // First clip shape.
            styled->toClipPath(clipPath);
            clipRule = svgStyle->clipRule();
            clipPath.setWindRule(clipRule);
            continue;
        }

        if (RuntimeEnabledFeatures::pathOpsSVGClippingEnabled()) {
            // Attempt to generate a combined clip path, fall back to masking if not possible.
            Path subPath;
            styled->toClipPath(subPath);
            subPath.setWindRule(svgStyle->clipRule());
            if (!clipPath.unionPath(subPath))
                return false;
        } else {
            return false;
        }
    }
    // Only one visible shape/path was found. Directly continue clipping and transform the content to userspace if necessary.
    if (toSVGClipPathElement(element())->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
        AffineTransform transform;
        transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
        transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
        clipPath.transform(transform);
    }

    // Transform path by animatedLocalTransform.
    clipPath.transform(animatedLocalTransform);

    // The SVG specification wants us to clip everything, if clip-path doesn't have a child.
    if (clipPath.isEmpty())
        clipPath.addRect(FloatRect());
    context->clipPath(clipPath, clipRule);
    return true;
}