layout/svg/SVGFilterFrame.h

   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 #ifndef LAYOUT_SVG_SVGFILTERFRAME_H_
   8 #define LAYOUT_SVG_SVGFILTERFRAME_H_
   9
  10 #include "mozilla/Attributes.h"
  11 #include "mozilla/SVGContainerFrame.h"
  12 #include "nsQueryFrame.h"
  13
  14 class nsAtom;
  15 class nsIContent;
  16 class nsIFrame;
  17
  18 struct nsRect;
  19
  20 namespace mozilla {
  21 class SVGAnimatedLength;
  22 class SVGFilterInstance;
  23 class PresShell;
  24
  25 namespace dom {
  26 class SVGFilterElement;
  27 }  // namespace dom
  28 }  // namespace mozilla
  29
  30 nsIFrame* NS_NewSVGFilterFrame(mozilla::PresShell* aPresShell,
  31                                mozilla::ComputedStyle* aStyle);
  32
  33 namespace mozilla {
  34
  35 class SVGFilterFrame final : public SVGContainerFrame {
  36   friend nsIFrame* ::NS_NewSVGFilterFrame(mozilla::PresShell* aPresShell,
  37                                           ComputedStyle* aStyle);
  38
  39  protected:
  40   explicit SVGFilterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  41       : SVGContainerFrame(aStyle, aPresContext, kClassID),
  42         mLoopFlag(false),
  43         mNoHRefURI(false) {
  44     AddStateBits(NS_FRAME_IS_NONDISPLAY |
  45                  NS_STATE_SVG_RENDERING_OBSERVER_CONTAINER);
  46   }
  47
  48  public:
  49   NS_DECL_FRAMEARENA_HELPERS(SVGFilterFrame)
  50
  51   // nsIFrame methods:
  52   void BuildDisplayList(nsDisplayListBuilder* aBuilder,
  53                         const nsDisplayListSet& aLists) override {}
  54
  55   nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  56                             int32_t aModType) override;
  57
  58 #ifdef DEBUG
  59   void Init(nsIContent* aContent, nsContainerFrame* aParent,
  60             nsIFrame* aPrevInFlow) override;
  61 #endif
  62
  63  private:
  64   friend class SVGFilterInstance;
  65
  66   /**
  67    * Parses this frame's href and - if it references another filter - returns
  68    * it.  It also makes this frame a rendering observer of the specified ID.
  69    */
  70   SVGFilterFrame* GetReferencedFilter();
  71
  72   // Accessors to lookup filter attributes
  73   uint16_t GetEnumValue(uint32_t aIndex, nsIContent* aDefault);
  74   uint16_t GetEnumValue(uint32_t aIndex) {
  75     return GetEnumValue(aIndex, mContent);
  76   }
  77   const mozilla::SVGAnimatedLength* GetLengthValue(uint32_t aIndex,
  78                                                    nsIContent* aDefault);
  79   const mozilla::SVGAnimatedLength* GetLengthValue(uint32_t aIndex) {
  80     return GetLengthValue(aIndex, mContent);
  81   }
  82   const mozilla::dom::SVGFilterElement* GetFilterContent(nsIContent* aDefault);
  83   const mozilla::dom::SVGFilterElement* GetFilterContent() {
  84     return GetFilterContent(mContent);
  85   }
  86
  87   // This flag is used to detect loops in xlink:href processing
  88   bool mLoopFlag;
  89   bool mNoHRefURI;
  90 };
  91
  92 }  // namespace mozilla
  93
  94 #endif  // LAYOUT_SVG_SVGFILTERFRAME_H_