michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: // Main header first:
michael@0: #include "nsSVGFilterFrame.h"
michael@0: 
michael@0: // Keep others in (case-insensitive) order:
michael@0: #include "gfxUtils.h"
michael@0: #include "nsGkAtoms.h"
michael@0: #include "nsRenderingContext.h"
michael@0: #include "nsSVGEffects.h"
michael@0: #include "nsSVGElement.h"
michael@0: #include "mozilla/dom/SVGFilterElement.h"
michael@0: #include "nsSVGFilterInstance.h"
michael@0: #include "nsSVGFilterPaintCallback.h"
michael@0: #include "nsSVGIntegrationUtils.h"
michael@0: #include "nsSVGUtils.h"
michael@0: #include "nsContentUtils.h"
michael@0: 
michael@0: using namespace mozilla::dom;
michael@0: 
michael@0: nsIFrame*
michael@0: NS_NewSVGFilterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
michael@0: {
michael@0:   return new (aPresShell) nsSVGFilterFrame(aContext);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsSVGFilterFrame)
michael@0: 
michael@0: class MOZ_STACK_CLASS nsSVGFilterFrame::AutoFilterReferencer
michael@0: {
michael@0: public:
michael@0:   AutoFilterReferencer(nsSVGFilterFrame *aFrame MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
michael@0:     : mFrame(aFrame)
michael@0:   {
michael@0:     MOZ_GUARD_OBJECT_NOTIFIER_INIT;
michael@0:     // Reference loops should normally be detected in advance and handled, so
michael@0:     // we're not expecting to encounter them here
michael@0:     NS_ABORT_IF_FALSE(!mFrame->mLoopFlag, "Undetected reference loop!");
michael@0:     mFrame->mLoopFlag = true;
michael@0:   }
michael@0:   ~AutoFilterReferencer() {
michael@0:     mFrame->mLoopFlag = false;
michael@0:   }
michael@0: private:
michael@0:   nsSVGFilterFrame *mFrame;
michael@0:   MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
michael@0: };
michael@0: 
michael@0: uint16_t
michael@0: nsSVGFilterFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
michael@0: {
michael@0:   nsSVGEnum& thisEnum =
michael@0:     static_cast<SVGFilterElement *>(mContent)->mEnumAttributes[aIndex];
michael@0: 
michael@0:   if (thisEnum.IsExplicitlySet())
michael@0:     return thisEnum.GetAnimValue();
michael@0: 
michael@0:   AutoFilterReferencer filterRef(this);
michael@0: 
michael@0:   nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
michael@0:   return next ? next->GetEnumValue(aIndex, aDefault) :
michael@0:     static_cast<SVGFilterElement *>(aDefault)->
michael@0:       mEnumAttributes[aIndex].GetAnimValue();
michael@0: }
michael@0: 
michael@0: const nsSVGLength2 *
michael@0: nsSVGFilterFrame::GetLengthValue(uint32_t aIndex, nsIContent *aDefault)
michael@0: {
michael@0:   const nsSVGLength2 *thisLength =
michael@0:     &static_cast<SVGFilterElement *>(mContent)->mLengthAttributes[aIndex];
michael@0: 
michael@0:   if (thisLength->IsExplicitlySet())
michael@0:     return thisLength;
michael@0: 
michael@0:   AutoFilterReferencer filterRef(this);
michael@0: 
michael@0:   nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
michael@0:   return next ? next->GetLengthValue(aIndex, aDefault) :
michael@0:     &static_cast<SVGFilterElement *>(aDefault)->mLengthAttributes[aIndex];
michael@0: }
michael@0: 
michael@0: const SVGFilterElement *
michael@0: nsSVGFilterFrame::GetFilterContent(nsIContent *aDefault)
michael@0: {
michael@0:   for (nsIContent* child = mContent->GetFirstChild();
michael@0:        child;
michael@0:        child = child->GetNextSibling()) {
michael@0:     nsRefPtr<nsSVGFE> primitive;
michael@0:     CallQueryInterface(child, (nsSVGFE**)getter_AddRefs(primitive));
michael@0:     if (primitive) {
michael@0:       return static_cast<SVGFilterElement *>(mContent);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   AutoFilterReferencer filterRef(this);
michael@0: 
michael@0:   nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
michael@0:   return next ? next->GetFilterContent(aDefault) :
michael@0:     static_cast<SVGFilterElement *>(aDefault);
michael@0: }
michael@0: 
michael@0: nsSVGFilterFrame *
michael@0: nsSVGFilterFrame::GetReferencedFilter()
michael@0: {
michael@0:   if (mNoHRefURI)
michael@0:     return nullptr;
michael@0: 
michael@0:   nsSVGPaintingProperty *property = static_cast<nsSVGPaintingProperty*>
michael@0:     (Properties().Get(nsSVGEffects::HrefProperty()));
michael@0: 
michael@0:   if (!property) {
michael@0:     // Fetch our Filter element's xlink:href attribute
michael@0:     SVGFilterElement *filter = static_cast<SVGFilterElement *>(mContent);
michael@0:     nsAutoString href;
michael@0:     filter->mStringAttributes[SVGFilterElement::HREF].GetAnimValue(href, filter);
michael@0:     if (href.IsEmpty()) {
michael@0:       mNoHRefURI = true;
michael@0:       return nullptr; // no URL
michael@0:     }
michael@0: 
michael@0:     // Convert href to an nsIURI
michael@0:     nsCOMPtr<nsIURI> targetURI;
michael@0:     nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
michael@0:     nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
michael@0:                                               mContent->GetCurrentDoc(), base);
michael@0: 
michael@0:     property =
michael@0:       nsSVGEffects::GetPaintingProperty(targetURI, this, nsSVGEffects::HrefProperty());
michael@0:     if (!property)
michael@0:       return nullptr;
michael@0:   }
michael@0: 
michael@0:   nsIFrame *result = property->GetReferencedFrame();
michael@0:   if (!result)
michael@0:     return nullptr;
michael@0: 
michael@0:   nsIAtom* frameType = result->GetType();
michael@0:   if (frameType != nsGkAtoms::svgFilterFrame)
michael@0:     return nullptr;
michael@0: 
michael@0:   return static_cast<nsSVGFilterFrame*>(result);
michael@0: }
michael@0: 
michael@0: nsSVGFilterFrame *
michael@0: nsSVGFilterFrame::GetReferencedFilterIfNotInUse()
michael@0: {
michael@0:   nsSVGFilterFrame *referenced = GetReferencedFilter();
michael@0:   if (!referenced)
michael@0:     return nullptr;
michael@0: 
michael@0:   if (referenced->mLoopFlag) {
michael@0:     // XXXjwatt: we should really send an error to the JavaScript Console here:
michael@0:     NS_WARNING("Filter reference loop detected while inheriting attribute!");
michael@0:     return nullptr;
michael@0:   }
michael@0: 
michael@0:   return referenced;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsSVGFilterFrame::AttributeChanged(int32_t  aNameSpaceID,
michael@0:                                    nsIAtom* aAttribute,
michael@0:                                    int32_t  aModType)
michael@0: {
michael@0:   if (aNameSpaceID == kNameSpaceID_None &&
michael@0:       (aAttribute == nsGkAtoms::x ||
michael@0:        aAttribute == nsGkAtoms::y ||
michael@0:        aAttribute == nsGkAtoms::width ||
michael@0:        aAttribute == nsGkAtoms::height ||
michael@0:        aAttribute == nsGkAtoms::filterUnits ||
michael@0:        aAttribute == nsGkAtoms::primitiveUnits)) {
michael@0:     nsSVGEffects::InvalidateDirectRenderingObservers(this);
michael@0:   } else if (aNameSpaceID == kNameSpaceID_XLink &&
michael@0:              aAttribute == nsGkAtoms::href) {
michael@0:     // Blow away our reference, if any
michael@0:     Properties().Delete(nsSVGEffects::HrefProperty());
michael@0:     mNoHRefURI = false;
michael@0:     // And update whoever references us
michael@0:     nsSVGEffects::InvalidateDirectRenderingObservers(this);
michael@0:   }
michael@0:   return nsSVGFilterFrameBase::AttributeChanged(aNameSpaceID,
michael@0:                                                 aAttribute, aModType);
michael@0: }
michael@0: 
michael@0: #ifdef DEBUG
michael@0: void
michael@0: nsSVGFilterFrame::Init(nsIContent* aContent,
michael@0:                        nsIFrame* aParent,
michael@0:                        nsIFrame* aPrevInFlow)
michael@0: {
michael@0:   NS_ASSERTION(aContent->IsSVG(nsGkAtoms::filter),
michael@0:                "Content is not an SVG filter");
michael@0: 
michael@0:   nsSVGFilterFrameBase::Init(aContent, aParent, aPrevInFlow);
michael@0: }
michael@0: #endif /* DEBUG */
michael@0: 
michael@0: nsIAtom *
michael@0: nsSVGFilterFrame::GetType() const
michael@0: {
michael@0:   return nsGkAtoms::svgFilterFrame;
michael@0: }