layout/svg/SVGFELeafFrame.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 "ComputedStyle.h"
  12 #include "nsContainerFrame.h"
  13 #include "nsIFrame.h"
  14 #include "nsGkAtoms.h"
  15
  16 using namespace mozilla::dom;
  17
  18 nsIFrame* NS_NewSVGFELeafFrame(mozilla::PresShell* aPresShell,
  19                                mozilla::ComputedStyle* aStyle);
  20 namespace mozilla {
  21
  22 /*
  23  * This frame is used by filter primitive elements that don't
  24  * have special child elements that provide parameters.
  25  */
  26 class SVGFELeafFrame final : public nsIFrame {
  27   friend nsIFrame* ::NS_NewSVGFELeafFrame(mozilla::PresShell* aPresShell,
  28                                           ComputedStyle* aStyle);
  29
  30  protected:
  31   explicit SVGFELeafFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  32       : nsIFrame(aStyle, aPresContext, kClassID) {
  33     AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
  34   }
  35
  36  public:
  37   NS_DECL_FRAMEARENA_HELPERS(SVGFELeafFrame)
  38
  39 #ifdef DEBUG
  40   void Init(nsIContent* aContent, nsContainerFrame* aParent,
  41             nsIFrame* aPrevInFlow) override;
  42 #endif
  43
  44 #ifdef DEBUG_FRAME_DUMP
  45   nsresult GetFrameName(nsAString& aResult) const override {
  46     return MakeFrameName(u"SVGFELeaf"_ns, aResult);
  47   }
  48 #endif
  49
  50   nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  51                             int32_t aModType) override;
  52
  53   bool ComputeCustomOverflow(OverflowAreas& aOverflowAreas) override {
  54     // We don't maintain a ink overflow rect
  55     return false;
  56   }
  57 };
  58
  59 }  // namespace mozilla
  60
  61 nsIFrame* NS_NewSVGFELeafFrame(mozilla::PresShell* aPresShell,
  62                                mozilla::ComputedStyle* aStyle) {
  63   return new (aPresShell)
  64       mozilla::SVGFELeafFrame(aStyle, aPresShell->GetPresContext());
  65 }
  66
  67 namespace mozilla {
  68
  69 NS_IMPL_FRAMEARENA_HELPERS(SVGFELeafFrame)
  70
  71 #ifdef DEBUG
  72 void SVGFELeafFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
  73                           nsIFrame* aPrevInFlow) {
  74   NS_ASSERTION(aContent->IsSVGFilterPrimitiveElement(),
  75                "Trying to construct an SVGFELeafFrame for a "
  76                "content element that doesn't support the right interfaces");
  77
  78   nsIFrame::Init(aContent, aParent, aPrevInFlow);
  79 }
  80 #endif /* DEBUG */
  81
  82 nsresult SVGFELeafFrame::AttributeChanged(int32_t aNameSpaceID,
  83                                           nsAtom* aAttribute,
  84                                           int32_t aModType) {
  85   auto* element =
  86       static_cast<mozilla::dom::SVGFilterPrimitiveElement*>(GetContent());
  87   if (element->AttributeAffectsRendering(aNameSpaceID, aAttribute)) {
  88     MOZ_ASSERT(
  89         GetParent()->IsSVGFilterFrame(),
  90         "Observers observe the filter, so that's what we must invalidate");
  91     SVGObserverUtils::InvalidateRenderingObservers(GetParent());
  92   }
  93
  94   return nsIFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
  95 }
  96
  97 }  // namespace mozilla