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 using namespace mozilla::dom;
  17
  18 nsIFrame* NS_NewSVGFEContainerFrame(mozilla::PresShell* aPresShell,
  19                                     mozilla::ComputedStyle* aStyle);
  20
  21 namespace mozilla {
  22
  23 /*
  24  * This frame is used by filter primitive elements that
  25  * have special child elements that provide parameters.
  26  */
  27 class SVGFEContainerFrame final : public nsContainerFrame {
  28   friend nsIFrame* ::NS_NewSVGFEContainerFrame(mozilla::PresShell* aPresShell,
  29                                                ComputedStyle* aStyle);
  30
  31  protected:
  32   explicit SVGFEContainerFrame(ComputedStyle* aStyle,
  33                                nsPresContext* aPresContext)
  34       : nsContainerFrame(aStyle, aPresContext, kClassID) {
  35     AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
  36   }
  37
  38  public:
  39   NS_DECL_FRAMEARENA_HELPERS(SVGFEContainerFrame)
  40
  41 #ifdef DEBUG_FRAME_DUMP
  42   nsresult GetFrameName(nsAString& aResult) const override {
  43     return MakeFrameName(u"SVGFEContainer"_ns, aResult);
  44   }
  45 #endif
  46
  47 #ifdef DEBUG
  48   void Init(nsIContent* aContent, nsContainerFrame* aParent,
  49             nsIFrame* aPrevInFlow) override;
  50 #endif
  51
  52   nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  53                             int32_t aModType) override;
  54
  55   bool ComputeCustomOverflow(OverflowAreas& aOverflowAreas) override {
  56     // We don't maintain a ink overflow rect
  57     return false;
  58   }
  59 };
  60
  61 }  // namespace mozilla
  62
  63 nsIFrame* NS_NewSVGFEContainerFrame(mozilla::PresShell* aPresShell,
  64                                     mozilla::ComputedStyle* aStyle) {
  65   return new (aPresShell)
  66       mozilla::SVGFEContainerFrame(aStyle, aPresShell->GetPresContext());
  67 }
  68
  69 namespace mozilla {
  70
  71 NS_IMPL_FRAMEARENA_HELPERS(SVGFEContainerFrame)
  72
  73 #ifdef DEBUG
  74 void SVGFEContainerFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
  75                                nsIFrame* aPrevInFlow) {
  76   NS_ASSERTION(aContent->IsSVGFilterPrimitiveElement(),
  77                "Trying to construct an SVGFEContainerFrame for a "
  78                "content element that doesn't support the right interfaces");
  79
  80   nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
  81 }
  82 #endif /* DEBUG */
  83
  84 nsresult SVGFEContainerFrame::AttributeChanged(int32_t aNameSpaceID,
  85                                                nsAtom* aAttribute,
  86                                                int32_t aModType) {
  87   dom::SVGFilterPrimitiveElement* element =
  88       static_cast<dom::SVGFilterPrimitiveElement*>(GetContent());
  89   if (element->AttributeAffectsRendering(aNameSpaceID, aAttribute)) {
  90     MOZ_ASSERT(
  91         GetParent()->IsSVGFilterFrame(),
  92         "Observers observe the filter, so that's what we must invalidate");
  93     SVGObserverUtils::InvalidateRenderingObservers(GetParent());
  94   }
  95
  96   return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
  97 }
  98
  99 }  // namespace mozilla