layout/svg/nsSVGGFrame.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 // Main header first:
   7 #include "nsSVGGFrame.h"
   8
   9 // Keep others in (case-insensitive) order:
  10 #include "nsGkAtoms.h"
  11 #include "SVGTransformableElement.h"
  12 #include "nsIFrame.h"
  13 #include "SVGGraphicsElement.h"
  14 #include "nsSVGIntegrationUtils.h"
  15 #include "nsSVGUtils.h"
  16
  17 using namespace mozilla::dom;
  18
  19 //----------------------------------------------------------------------
  20 // Implementation
  21
  22 nsIFrame*
  23 NS_NewSVGGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  24 {
  25   return new (aPresShell) nsSVGGFrame(aContext);
  26 }
  27
  28 NS_IMPL_FRAMEARENA_HELPERS(nsSVGGFrame)
  29
  30 #ifdef DEBUG
  31 void
  32 nsSVGGFrame::Init(nsIContent* aContent,
  33                   nsIFrame* aParent,
  34                   nsIFrame* aPrevInFlow)
  35 {
  36   NS_ASSERTION(aContent->IsSVG() &&
  37                static_cast<nsSVGElement*>(aContent)->IsTransformable(),
  38                "The element doesn't support nsIDOMSVGTransformable");
  39
  40   nsSVGGFrameBase::Init(aContent, aParent, aPrevInFlow);
  41 }
  42 #endif /* DEBUG */
  43
  44 nsIAtom *
  45 nsSVGGFrame::GetType() const
  46 {
  47   return nsGkAtoms::svgGFrame;
  48 }
  49
  50 //----------------------------------------------------------------------
  51 // nsISVGChildFrame methods
  52
  53 void
  54 nsSVGGFrame::NotifySVGChanged(uint32_t aFlags)
  55 {
  56   NS_ABORT_IF_FALSE(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
  57                     "Invalidation logic may need adjusting");
  58
  59   if (aFlags & TRANSFORM_CHANGED) {
  60     // make sure our cached transform matrix gets (lazily) updated
  61     mCanvasTM = nullptr;
  62   }
  63
  64   nsSVGGFrameBase::NotifySVGChanged(aFlags);
  65 }
  66
  67 gfxMatrix
  68 nsSVGGFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot)
  69 {
  70   if (!(GetStateBits() & NS_FRAME_IS_NONDISPLAY) && !aTransformRoot) {
  71     if ((aFor == FOR_PAINTING && NS_SVGDisplayListPaintingEnabled()) ||
  72         (aFor == FOR_HIT_TESTING && NS_SVGDisplayListHitTestingEnabled())) {
  73       return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(this);
  74     }
  75   }
  76   if (!mCanvasTM) {
  77     NS_ASSERTION(mParent, "null parent");
  78
  79     nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
  80     SVGGraphicsElement *content = static_cast<SVGGraphicsElement*>(mContent);
  81     gfxMatrix tm = content->PrependLocalTransformsTo(
  82         this == aTransformRoot ? gfxMatrix() :
  83                                  parent->GetCanvasTM(aFor, aTransformRoot));
  84
  85     mCanvasTM = new gfxMatrix(tm);
  86   }
  87   return *mCanvasTM;
  88 }
  89
  90 nsresult
  91 nsSVGGFrame::AttributeChanged(int32_t         aNameSpaceID,
  92                               nsIAtom*        aAttribute,
  93                               int32_t         aModType)
  94 {
  95   if (aNameSpaceID == kNameSpaceID_None &&
  96       aAttribute == nsGkAtoms::transform) {
  97     // We don't invalidate for transform changes (the layers code does that).
  98     // Also note that SVGTransformableElement::GetAttributeChangeHint will
  99     // return nsChangeHint_UpdateOverflow for "transform" attribute changes
 100     // and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
 101     NotifySVGChanged(TRANSFORM_CHANGED);
 102   }
 103
 104   return NS_OK;
 105 }