layout/svg/SVGFELeafFrame.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 // Keep in (case-insensitive) order:
   7 #include "nsContainerFrame.h"
   8 #include "nsFrame.h"
   9 #include "nsGkAtoms.h"
  10 #include "nsSVGEffects.h"
  11 #include "nsSVGFilters.h"
  12
  13 typedef nsFrame SVGFELeafFrameBase;
  14
  15 /*
  16  * This frame is used by filter primitive elements that don't
  17  * have special child elements that provide parameters.
  18  */
  19 class SVGFELeafFrame : public SVGFELeafFrameBase
  20 {
  21   friend nsIFrame*
  22   NS_NewSVGFELeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
  23 protected:
  24   explicit SVGFELeafFrame(nsStyleContext* aContext)
  25     : SVGFELeafFrameBase(aContext)
  26   {
  27     AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
  28   }
  29
  30 public:
  31   NS_DECL_FRAMEARENA_HELPERS
  32
  33 #ifdef DEBUG
  34   virtual void Init(nsIContent*       aContent,
  35                     nsContainerFrame* aParent,
  36                     nsIFrame*         aPrevInFlow) MOZ_OVERRIDE;
  37 #endif
  38
  39   virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
  40   {
  41     return SVGFELeafFrameBase::IsFrameOfType(aFlags & ~(nsIFrame::eSVG));
  42   }
  43
  44 #ifdef DEBUG_FRAME_DUMP
  45   virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE
  46   {
  47     return MakeFrameName(NS_LITERAL_STRING("SVGFELeaf"), aResult);
  48   }
  49 #endif
  50
  51   /**
  52    * Get the "type" of the frame
  53    *
  54    * @see nsGkAtoms::svgFELeafFrame
  55    */
  56   virtual nsIAtom* GetType() const MOZ_OVERRIDE;
  57
  58   virtual nsresult AttributeChanged(int32_t  aNameSpaceID,
  59                                     nsIAtom* aAttribute,
  60                                     int32_t  aModType) MOZ_OVERRIDE;
  61
  62   virtual bool UpdateOverflow() MOZ_OVERRIDE {
  63     // We don't maintain a visual overflow rect
  64     return false;
  65   }
  66 };
  67
  68 nsIFrame*
  69 NS_NewSVGFELeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  70 {
  71   return new (aPresShell) SVGFELeafFrame(aContext);
  72 }
  73
  74 NS_IMPL_FRAMEARENA_HELPERS(SVGFELeafFrame)
  75
  76 #ifdef DEBUG
  77 void
  78 SVGFELeafFrame::Init(nsIContent*       aContent,
  79                      nsContainerFrame* aParent,
  80                      nsIFrame*         aPrevInFlow)
  81 {
  82   NS_ASSERTION(aContent->IsNodeOfType(nsINode::eFILTER),
  83                "Trying to construct an SVGFELeafFrame for a "
  84                "content element that doesn't support the right interfaces");
  85
  86   SVGFELeafFrameBase::Init(aContent, aParent, aPrevInFlow);
  87 }
  88 #endif /* DEBUG */
  89
  90 nsIAtom *
  91 SVGFELeafFrame::GetType() const
  92 {
  93   return nsGkAtoms::svgFELeafFrame;
  94 }
  95
  96 nsresult
  97 SVGFELeafFrame::AttributeChanged(int32_t  aNameSpaceID,
  98                                  nsIAtom* aAttribute,
  99                                  int32_t  aModType)
 100 {
 101   nsSVGFE *element = static_cast<nsSVGFE*>(mContent);
 102   if (element->AttributeAffectsRendering(aNameSpaceID, aAttribute)) {
 103     MOZ_ASSERT(GetParent()->GetType() == nsGkAtoms::svgFilterFrame,
 104                "Observers observe the filter, so that's what we must invalidate");
 105     nsSVGEffects::InvalidateDirectRenderingObservers(GetParent());
 106   }
 107
 108   return SVGFELeafFrameBase::AttributeChanged(aNameSpaceID,
 109                                               aAttribute, aModType);
 110 }