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SVGPreserveAspectRatio.h (3950B)

      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 DOM_SVG_SVGPRESERVEASPECTRATIO_H_
      8 #define DOM_SVG_SVGPRESERVEASPECTRATIO_H_
      9 
     10 #include "mozilla/HashFunctions.h"  // for HashGeneric
     11 #include "mozilla/dom/SVGElement.h"
     12 #include "mozilla/dom/SVGPreserveAspectRatioBinding.h"
     13 #include "nsCycleCollectionParticipant.h"
     14 #include "nsWrapperCache.h"
     15 
     16 namespace mozilla {
     17 class ErrorResult;
     18 
     19 // These constants represent the range of valid enum values for the <align>
     20 // parameter. They exclude the sentinel _UNKNOWN value.
     21 const uint16_t SVG_ALIGN_MIN_VALID =
     22    dom::SVGPreserveAspectRatio_Binding::SVG_PRESERVEASPECTRATIO_NONE;
     23 const uint16_t SVG_ALIGN_MAX_VALID =
     24    dom::SVGPreserveAspectRatio_Binding::SVG_PRESERVEASPECTRATIO_XMAXYMAX;
     25 
     26 // These constants represent the range of valid enum values for the
     27 // <meetOrSlice> parameter. They exclude the sentinel _UNKNOWN value.
     28 const uint16_t SVG_MEETORSLICE_MIN_VALID =
     29    dom::SVGPreserveAspectRatio_Binding::SVG_MEETORSLICE_MEET;
     30 const uint16_t SVG_MEETORSLICE_MAX_VALID =
     31    dom::SVGPreserveAspectRatio_Binding::SVG_MEETORSLICE_SLICE;
     32 
     33 class SVGAnimatedPreserveAspectRatio;
     34 
     35 class SVGPreserveAspectRatio final {
     36  friend class SVGAnimatedPreserveAspectRatio;
     37 
     38 public:
     39  explicit SVGPreserveAspectRatio()
     40      : mAlign(dom::SVGPreserveAspectRatio_Binding::
     41                   SVG_PRESERVEASPECTRATIO_UNKNOWN),
     42        mMeetOrSlice(
     43            dom::SVGPreserveAspectRatio_Binding::SVG_MEETORSLICE_UNKNOWN) {}
     44 
     45  SVGPreserveAspectRatio(uint8_t aAlign, uint8_t aMeetOrSlice)
     46      : mAlign(aAlign), mMeetOrSlice(aMeetOrSlice) {}
     47 
     48  static nsresult FromString(const nsAString& aString,
     49                             SVGPreserveAspectRatio* aValue);
     50  void ToString(nsAString& aValueAsString) const;
     51 
     52  bool operator==(const SVGPreserveAspectRatio& aOther) const;
     53 
     54  bool SetAlign(uint16_t aAlign) {
     55    if (aAlign < SVG_ALIGN_MIN_VALID || aAlign > SVG_ALIGN_MAX_VALID)
     56      return false;
     57    mAlign = static_cast<uint8_t>(aAlign);
     58    return true;
     59  }
     60 
     61  auto GetAlign() const { return mAlign; }
     62 
     63  bool SetMeetOrSlice(uint16_t aMeetOrSlice) {
     64    if (aMeetOrSlice < SVG_MEETORSLICE_MIN_VALID ||
     65        aMeetOrSlice > SVG_MEETORSLICE_MAX_VALID)
     66      return false;
     67    mMeetOrSlice = static_cast<uint8_t>(aMeetOrSlice);
     68    return true;
     69  }
     70 
     71  auto GetMeetOrSlice() const { return mMeetOrSlice; }
     72 
     73  PLDHashNumber Hash() const { return HashGeneric(mAlign, mMeetOrSlice); }
     74 
     75 private:
     76  // We can't use enum types here because some compilers fail to pack them.
     77  uint8_t mAlign;
     78  uint8_t mMeetOrSlice;
     79 };
     80 
     81 namespace dom {
     82 
     83 class DOMSVGPreserveAspectRatio final : public nsWrapperCache {
     84 public:
     85  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(DOMSVGPreserveAspectRatio)
     86  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(DOMSVGPreserveAspectRatio)
     87 
     88  DOMSVGPreserveAspectRatio(SVGAnimatedPreserveAspectRatio* aVal,
     89                            SVGElement* aSVGElement, bool aIsBaseValue)
     90      : mVal(aVal), mSVGElement(aSVGElement), mIsBaseValue(aIsBaseValue) {}
     91 
     92  // WebIDL
     93  SVGElement* GetParentObject() const { return mSVGElement; }
     94  JSObject* WrapObject(JSContext* aCx,
     95                       JS::Handle<JSObject*> aGivenProto) override;
     96 
     97  uint16_t Align();
     98  void SetAlign(uint16_t aAlign, ErrorResult& aRv);
     99  uint16_t MeetOrSlice();
    100  void SetMeetOrSlice(uint16_t aMeetOrSlice, ErrorResult& aRv);
    101 
    102 protected:
    103  ~DOMSVGPreserveAspectRatio();
    104 
    105  SVGAnimatedPreserveAspectRatio*
    106      mVal;  // kept alive because it belongs to mSVGElement
    107  RefPtr<SVGElement> mSVGElement;
    108  const bool mIsBaseValue;
    109 };
    110 
    111 }  // namespace dom
    112 }  // namespace mozilla
    113 
    114 #endif  // DOM_SVG_SVGPRESERVEASPECTRATIO_H_