layout/svg/SVGFEContainerFrame.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 // Keep in (case-insensitive) order:
   8 #include "mozilla/PresShell.h"
   9 #include "mozilla/SVGObserverUtils.h"
  10 #include "mozilla/dom/SVGFilters.h"
  11 #include "nsContainerFrame.h"
  12 #include "nsGkAtoms.h"
  13 #include "nsIFrame.h"
  14 #include "nsLiteralString.h"
  15
  16 nsIFrame* NS_NewSVGFEContainerFrame(mozilla::PresShell* aPresShell,
  17                                     mozilla::ComputedStyle* aStyle);
  18
  19 namespace mozilla {
  20
  21 /*
  22  * This frame is used by filter primitive elements that
  23  * have special child elements that provide parameters.
  24  */
  25 class SVGFEContainerFrame final : public nsContainerFrame {
  26   friend nsIFrame* ::NS_NewSVGFEContainerFrame(mozilla::PresShell* aPresShell,
  27                                                ComputedStyle* aStyle);
  28
  29  protected:
  30   explicit SVGFEContainerFrame(ComputedStyle* aStyle,
  31                                nsPresContext* aPresContext)
  32       : nsContainerFrame(aStyle, aPresContext, kClassID) {
  33     AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
  34   }
  35
  36  public:
  37   NS_DECL_FRAMEARENA_HELPERS(SVGFEContainerFrame)
  38
  39   virtual bool IsFrameOfType(uint32_t aFlags) const override {
  40     if (aFlags & eSupportsContainLayoutAndPaint) {
  41       return false;
  42     }
  43
  44     return nsContainerFrame::IsFrameOfType(
  45         aFlags & ~(nsIFrame::eSVG | nsIFrame::eSVGContainer));
  46   }
  47
  48 #ifdef DEBUG_FRAME_DUMP
  49   virtual nsresult GetFrameName(nsAString& aResult) const override {
  50     return MakeFrameName(u"SVGFEContainer"_ns, aResult);
  51   }
  52 #endif
  53
  54 #ifdef DEBUG
  55   virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
  56                     nsIFrame* aPrevInFlow) override;
  57 #endif
  58
  59   virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  60                                     int32_t aModType) override;
  61
  62   virtual bool ComputeCustomOverflow(OverflowAreas& aOverflowAreas) override {
  63     // We don't maintain a ink overflow rect
  64     return false;
  65   }
  66 };
  67
  68 }  // namespace mozilla
  69
  70 nsIFrame* NS_NewSVGFEContainerFrame(mozilla::PresShell* aPresShell,
  71                                     mozilla::ComputedStyle* aStyle) {
  72   return new (aPresShell)
  73       mozilla::SVGFEContainerFrame(aStyle, aPresShell->GetPresContext());
  74 }
  75
  76 namespace mozilla {
  77
  78 NS_IMPL_FRAMEARENA_HELPERS(SVGFEContainerFrame)
  79
  80 #ifdef DEBUG
  81 void SVGFEContainerFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
  82                                nsIFrame* aPrevInFlow) {
  83   nsCOMPtr<SVGFE> filterPrimitive = do_QueryInterface(aContent);
  84   NS_ASSERTION(filterPrimitive,
  85                "Trying to construct an SVGFEContainerFrame for a "
  86                "content element that doesn't support the right interfaces");
  87
  88   nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
  89 }
  90 #endif /* DEBUG */
  91
  92 nsresult SVGFEContainerFrame::AttributeChanged(int32_t aNameSpaceID,
  93                                                nsAtom* aAttribute,
  94                                                int32_t aModType) {
  95   dom::SVGFE* element = static_cast<dom::SVGFE*>(GetContent());
  96   if (element->AttributeAffectsRendering(aNameSpaceID, aAttribute)) {
  97     MOZ_ASSERT(
  98         GetParent()->IsSVGFilterFrame(),
  99         "Observers observe the filter, so that's what we must invalidate");
 100     SVGObserverUtils::InvalidateDirectRenderingObservers(GetParent());
 101   }
 102
 103   return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
 104 }
 105
 106 }  // namespace mozilla