gecko-dev/layout/svg/nsSVGMarkerFrame.cpp

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/* -*- 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 "nsSVGMarkerFrame.h"
// Keep others in (case-insensitive) order:
#include "gfxContext.h"
#include "nsRenderingContext.h"
#include "nsSVGEffects.h"
#include "mozilla/dom/SVGMarkerElement.h"
#include "nsSVGPathGeometryElement.h"
#include "nsSVGPathGeometryFrame.h"
using namespace mozilla::dom;
using namespace mozilla::gfx;
nsIFrame*
NS_NewSVGMarkerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGMarkerFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGMarkerFrame)
//----------------------------------------------------------------------
// nsIFrame methods:
NS_IMETHODIMP
nsSVGMarkerFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::markerUnits ||
aAttribute == nsGkAtoms::refX ||
aAttribute == nsGkAtoms::refY ||
aAttribute == nsGkAtoms::markerWidth ||
aAttribute == nsGkAtoms::markerHeight ||
aAttribute == nsGkAtoms::orient ||
aAttribute == nsGkAtoms::preserveAspectRatio ||
aAttribute == nsGkAtoms::viewBox)) {
nsSVGEffects::InvalidateDirectRenderingObservers(this);
}
return nsSVGMarkerFrameBase::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
#ifdef DEBUG
void
nsSVGMarkerFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVG(nsGkAtoms::marker), "Content is not an SVG marker");
nsSVGMarkerFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom *
nsSVGMarkerFrame::GetType() const
{
return nsGkAtoms::svgMarkerFrame;
}
//----------------------------------------------------------------------
// nsSVGContainerFrame methods:
gfxMatrix
nsSVGMarkerFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot)
{
NS_ASSERTION(mMarkedFrame, "null nsSVGPathGeometry frame");
if (mInUse2) {
// We're going to be bailing drawing the marker, so return an identity.
return gfxMatrix();
}
SVGMarkerElement *content = static_cast<SVGMarkerElement*>(mContent);
mInUse2 = true;
gfxMatrix markedTM = mMarkedFrame->GetCanvasTM(aFor, aTransformRoot);
mInUse2 = false;
Matrix markerTM = content->GetMarkerTransform(mStrokeWidth, mX, mY,
mAutoAngle, mIsStart);
Matrix viewBoxTM = content->GetViewBoxTransform();
return ThebesMatrix(viewBoxTM * markerTM) * markedTM;
}
static nsIFrame*
GetAnonymousChildFrame(nsIFrame* aFrame)
{
nsIFrame* kid = aFrame->GetFirstPrincipalChild();
MOZ_ASSERT(kid && kid->GetType() == nsGkAtoms::svgMarkerAnonChildFrame,
"expected to find anonymous child of marker frame");
return kid;
}
nsresult
nsSVGMarkerFrame::PaintMark(nsRenderingContext *aContext,
nsSVGPathGeometryFrame *aMarkedFrame,
nsSVGMark *aMark, float aStrokeWidth)
{
// If the flag is set when we get here, it means this marker frame
// has already been used painting the current mark, and the document
// has a marker reference loop.
if (mInUse)
return NS_OK;
AutoMarkerReferencer markerRef(this, aMarkedFrame);
SVGMarkerElement *marker = static_cast<SVGMarkerElement*>(mContent);
const nsSVGViewBoxRect viewBox = marker->GetViewBoxRect();
if (viewBox.width <= 0.0f || viewBox.height <= 0.0f) {
// We must disable rendering if the viewBox width or height are zero.
return NS_OK;
}
mStrokeWidth = aStrokeWidth;
mX = aMark->x;
mY = aMark->y;
mAutoAngle = aMark->angle;
mIsStart = aMark->type == nsSVGMark::eStart;
gfxContext *gfx = aContext->ThebesContext();
if (StyleDisplay()->IsScrollableOverflow()) {
gfx->Save();
gfxRect clipRect =
nsSVGUtils::GetClipRectForFrame(this, viewBox.x, viewBox.y,
viewBox.width, viewBox.height);
nsSVGUtils::SetClipRect(gfx, GetCanvasTM(nsISVGChildFrame::FOR_PAINTING),
clipRect);
}
nsIFrame* kid = GetAnonymousChildFrame(this);
nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
// The CTM of each frame referencing us may be different.
SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
nsSVGUtils::PaintFrameWithEffects(aContext, nullptr, kid);
if (StyleDisplay()->IsScrollableOverflow())
gfx->Restore();
return NS_OK;
}
SVGBBox
nsSVGMarkerFrame::GetMarkBBoxContribution(const Matrix &aToBBoxUserspace,
uint32_t aFlags,
nsSVGPathGeometryFrame *aMarkedFrame,
const nsSVGMark *aMark,
float aStrokeWidth)
{
SVGBBox bbox;
// If the flag is set when we get here, it means this marker frame
// has already been used in calculating the current mark bbox, and
// the document has a marker reference loop.
if (mInUse)
return bbox;
AutoMarkerReferencer markerRef(this, aMarkedFrame);
SVGMarkerElement *content = static_cast<SVGMarkerElement*>(mContent);
const nsSVGViewBoxRect viewBox = content->GetViewBoxRect();
if (viewBox.width <= 0.0f || viewBox.height <= 0.0f) {
return bbox;
}
mStrokeWidth = aStrokeWidth;
mX = aMark->x;
mY = aMark->y;
mAutoAngle = aMark->angle;
mIsStart = aMark->type == nsSVGMark::eStart;
Matrix markerTM =
content->GetMarkerTransform(mStrokeWidth, mX, mY, mAutoAngle, mIsStart);
Matrix viewBoxTM = content->GetViewBoxTransform();
Matrix tm = viewBoxTM * markerTM * aToBBoxUserspace;
nsISVGChildFrame* child = do_QueryFrame(GetAnonymousChildFrame(this));
// When we're being called to obtain the invalidation area, we need to
// pass down all the flags so that stroke is included. However, once DOM
// getBBox() accepts flags, maybe we should strip some of those here?
// We need to include zero width/height vertical/horizontal lines, so we have
// to use UnionEdges.
bbox.UnionEdges(child->GetBBoxContribution(tm, aFlags));
return bbox;
}
void
nsSVGMarkerFrame::SetParentCoordCtxProvider(SVGSVGElement *aContext)
{
SVGMarkerElement *marker = static_cast<SVGMarkerElement*>(mContent);
marker->SetParentCoordCtxProvider(aContext);
}
//----------------------------------------------------------------------
// helper class
nsSVGMarkerFrame::AutoMarkerReferencer::AutoMarkerReferencer(
nsSVGMarkerFrame *aFrame,
nsSVGPathGeometryFrame *aMarkedFrame
MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
: mFrame(aFrame)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
mFrame->mInUse = true;
mFrame->mMarkedFrame = aMarkedFrame;
SVGSVGElement *ctx =
static_cast<nsSVGElement*>(aMarkedFrame->GetContent())->GetCtx();
mFrame->SetParentCoordCtxProvider(ctx);
}
nsSVGMarkerFrame::AutoMarkerReferencer::~AutoMarkerReferencer()
{
mFrame->SetParentCoordCtxProvider(nullptr);
mFrame->mMarkedFrame = nullptr;
mFrame->mInUse = false;
}
//----------------------------------------------------------------------
// Implementation of nsSVGMarkerAnonChildFrame
nsIFrame*
NS_NewSVGMarkerAnonChildFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext)
{
return new (aPresShell) nsSVGMarkerAnonChildFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGMarkerAnonChildFrame)
#ifdef DEBUG
void
nsSVGMarkerAnonChildFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ABORT_IF_FALSE(aParent->GetType() == nsGkAtoms::svgMarkerFrame,
"Unexpected parent");
nsSVGMarkerAnonChildFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif
nsIAtom *
nsSVGMarkerAnonChildFrame::GetType() const
{
return nsGkAtoms::svgMarkerAnonChildFrame;
}