dom/svg/SVGPreserveAspectRatio.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 #include "SVGPreserveAspectRatio.h"
   8
   9 #include "mozilla/dom/SVGPreserveAspectRatioBinding.h"
  10 #include "nsContentUtils.h"
  11 #include "nsWhitespaceTokenizer.h"
  12 #include "SVGAnimatedPreserveAspectRatio.h"
  13
  14 using namespace mozilla::dom;
  15 using namespace mozilla::dom::SVGPreserveAspectRatio_Binding;
  16
  17 namespace mozilla {
  18
  19 NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(DOMSVGPreserveAspectRatio,
  20                                                mSVGElement)
  21
  22 static const char* sAlignStrings[] = {
  23     "none",     "xMinYMin", "xMidYMin", "xMaxYMin", "xMinYMid",
  24     "xMidYMid", "xMaxYMid", "xMinYMax", "xMidYMax", "xMaxYMax"};
  25
  26 static const char* sMeetOrSliceStrings[] = {"meet", "slice"};
  27
  28 static uint16_t GetAlignForString(const nsAString& aAlignString) {
  29   for (uint32_t i = 0; i < ArrayLength(sAlignStrings); i++) {
  30     if (aAlignString.EqualsASCII(sAlignStrings[i])) {
  31       return (i + SVG_ALIGN_MIN_VALID);
  32     }
  33   }
  34
  35   return SVG_PRESERVEASPECTRATIO_UNKNOWN;
  36 }
  37
  38 static uint16_t GetMeetOrSliceForString(const nsAString& aMeetOrSlice) {
  39   for (uint32_t i = 0; i < ArrayLength(sMeetOrSliceStrings); i++) {
  40     if (aMeetOrSlice.EqualsASCII(sMeetOrSliceStrings[i])) {
  41       return (i + SVG_MEETORSLICE_MIN_VALID);
  42     }
  43   }
  44
  45   return SVG_MEETORSLICE_UNKNOWN;
  46 }
  47
  48 /* static */
  49 nsresult SVGPreserveAspectRatio::FromString(const nsAString& aString,
  50                                             SVGPreserveAspectRatio* aValue) {
  51   nsWhitespaceTokenizerTemplate<nsContentUtils::IsHTMLWhitespace> tokenizer(
  52       aString);
  53   if (tokenizer.whitespaceBeforeFirstToken() || !tokenizer.hasMoreTokens()) {
  54     return NS_ERROR_DOM_SYNTAX_ERR;
  55   }
  56   const nsAString& token = tokenizer.nextToken();
  57
  58   nsresult rv;
  59   SVGPreserveAspectRatio val;
  60
  61   rv = val.SetAlign(GetAlignForString(token));
  62
  63   if (NS_FAILED(rv)) {
  64     return NS_ERROR_DOM_SYNTAX_ERR;
  65   }
  66
  67   if (tokenizer.hasMoreTokens()) {
  68     rv = val.SetMeetOrSlice(GetMeetOrSliceForString(tokenizer.nextToken()));
  69     if (NS_FAILED(rv)) {
  70       return NS_ERROR_DOM_SYNTAX_ERR;
  71     }
  72   } else {
  73     val.SetMeetOrSlice(SVG_MEETORSLICE_MEET);
  74   }
  75
  76   if (tokenizer.whitespaceAfterCurrentToken()) {
  77     return NS_ERROR_DOM_SYNTAX_ERR;
  78   }
  79
  80   *aValue = val;
  81   return NS_OK;
  82 }
  83
  84 void SVGPreserveAspectRatio::ToString(nsAString& aValueAsString) const {
  85   MOZ_ASSERT(mAlign >= SVG_ALIGN_MIN_VALID && mAlign <= SVG_ALIGN_MAX_VALID,
  86              "Unknown align");
  87   aValueAsString.AssignASCII(sAlignStrings[mAlign - SVG_ALIGN_MIN_VALID]);
  88
  89   if (mAlign != uint8_t(SVG_PRESERVEASPECTRATIO_NONE)) {
  90     MOZ_ASSERT(mMeetOrSlice >= SVG_MEETORSLICE_MIN_VALID &&
  91                    mMeetOrSlice <= SVG_MEETORSLICE_MAX_VALID,
  92                "Unknown meetOrSlice");
  93     aValueAsString.Append(' ');
  94     aValueAsString.AppendASCII(
  95         sMeetOrSliceStrings[mMeetOrSlice - SVG_MEETORSLICE_MIN_VALID]);
  96   }
  97 }
  98
  99 bool SVGPreserveAspectRatio::operator==(
 100     const SVGPreserveAspectRatio& aOther) const {
 101   return mAlign == aOther.mAlign && mMeetOrSlice == aOther.mMeetOrSlice;
 102 }
 103
 104 JSObject* DOMSVGPreserveAspectRatio::WrapObject(
 105     JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
 106   return mozilla::dom::SVGPreserveAspectRatio_Binding::Wrap(aCx, this,
 107                                                             aGivenProto);
 108 }
 109
 110 uint16_t DOMSVGPreserveAspectRatio::Align() {
 111   if (mIsBaseValue) {
 112     return mVal->GetBaseValue().GetAlign();
 113   }
 114
 115   mSVGElement->FlushAnimations();
 116   return mVal->GetAnimValue().GetAlign();
 117 }
 118
 119 void DOMSVGPreserveAspectRatio::SetAlign(uint16_t aAlign, ErrorResult& rv) {
 120   if (!mIsBaseValue) {
 121     rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
 122     return;
 123   }
 124   rv = mVal->SetBaseAlign(aAlign, mSVGElement);
 125 }
 126
 127 uint16_t DOMSVGPreserveAspectRatio::MeetOrSlice() {
 128   if (mIsBaseValue) {
 129     return mVal->GetBaseValue().GetMeetOrSlice();
 130   }
 131
 132   mSVGElement->FlushAnimations();
 133   return mVal->GetAnimValue().GetMeetOrSlice();
 134 }
 135
 136 void DOMSVGPreserveAspectRatio::SetMeetOrSlice(uint16_t aMeetOrSlice,
 137                                                ErrorResult& rv) {
 138   if (!mIsBaseValue) {
 139     rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
 140     return;
 141   }
 142   rv = mVal->SetBaseMeetOrSlice(aMeetOrSlice, mSVGElement);
 143 }
 144
 145 }  // namespace mozilla