layout/svg/nsSVGGFrame.cpp
author Nick Fitzgerald <fitzgen@gmail.com>
Tue, 30 Jun 2015 10:01:00 -0700
changeset 250711 6509d3f6a91fd6856985adee8efd13a40f57de7a
parent 231538 133ec7304f2208e89f02ed943480a1b1f02188c9
child 293702 a872c181ca9abf7f04f8c21c6d5d53f9fc27e128
permissions -rw-r--r--
Bug 1174906 - Add a mozilla::Variant<T1, T2, ...> template class; r=Waldo

/* -*- 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 "nsSVGGFrame.h"

// Keep others in (case-insensitive) order:
#include "nsGkAtoms.h"
#include "SVGTransformableElement.h"
#include "nsIFrame.h"
#include "SVGGraphicsElement.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGUtils.h"

using namespace mozilla::dom;

//----------------------------------------------------------------------
// Implementation

nsIFrame*
NS_NewSVGGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{  
  return new (aPresShell) nsSVGGFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsSVGGFrame)

#ifdef DEBUG
void
nsSVGGFrame::Init(nsIContent*       aContent,
                  nsContainerFrame* aParent,
                  nsIFrame*         aPrevInFlow)
{
  NS_ASSERTION(aContent->IsSVGElement() &&
               static_cast<nsSVGElement*>(aContent)->IsTransformable(),
               "The element doesn't support nsIDOMSVGTransformable");

  nsSVGGFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */

nsIAtom *
nsSVGGFrame::GetType() const
{
  return nsGkAtoms::svgGFrame;
}

//----------------------------------------------------------------------
// nsISVGChildFrame methods

void
nsSVGGFrame::NotifySVGChanged(uint32_t aFlags)
{
  MOZ_ASSERT(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
             "Invalidation logic may need adjusting");

  if (aFlags & TRANSFORM_CHANGED) {
    // make sure our cached transform matrix gets (lazily) updated
    mCanvasTM = nullptr;
  }

  nsSVGGFrameBase::NotifySVGChanged(aFlags);
}

gfxMatrix
nsSVGGFrame::GetCanvasTM()
{
  if (!mCanvasTM) {
    NS_ASSERTION(GetParent(), "null parent");

    nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(GetParent());
    SVGGraphicsElement *content = static_cast<SVGGraphicsElement*>(mContent);

    gfxMatrix tm = content->PrependLocalTransformsTo(parent->GetCanvasTM());

    mCanvasTM = new gfxMatrix(tm);
  }
  return *mCanvasTM;
}

nsresult
nsSVGGFrame::AttributeChanged(int32_t         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              int32_t         aModType)
{
  if (aNameSpaceID == kNameSpaceID_None &&
      aAttribute == nsGkAtoms::transform) {
    // 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.
    NotifySVGChanged(TRANSFORM_CHANGED);
  }
  
  return NS_OK;
}