gecko-dev/dom/svg/SVGPreserveAspectRatio.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "SVGPreserveAspectRatio.h"

#include "mozilla/dom/SVGPreserveAspectRatioBinding.h"
#include "nsContentUtils.h"
#include "nsWhitespaceTokenizer.h"
#include "SVGAnimatedPreserveAspectRatio.h"

using namespace mozilla;
using namespace dom;
using namespace SVGPreserveAspectRatio_Binding;

NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(DOMSVGPreserveAspectRatio,
                                               mSVGElement)

NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMSVGPreserveAspectRatio)
NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMSVGPreserveAspectRatio)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMSVGPreserveAspectRatio)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

static const char* sAlignStrings[] = {
    "none",     "xMinYMin", "xMidYMin", "xMaxYMin", "xMinYMid",
    "xMidYMid", "xMaxYMid", "xMinYMax", "xMidYMax", "xMaxYMax"};

static const char* sMeetOrSliceStrings[] = {"meet", "slice"};

static uint16_t GetAlignForString(const nsAString& aAlignString) {
  for (uint32_t i = 0; i < ArrayLength(sAlignStrings); i++) {
    if (aAlignString.EqualsASCII(sAlignStrings[i])) {
      return (i + SVG_ALIGN_MIN_VALID);
    }
  }

  return SVG_PRESERVEASPECTRATIO_UNKNOWN;
}

static uint16_t GetMeetOrSliceForString(const nsAString& aMeetOrSlice) {
  for (uint32_t i = 0; i < ArrayLength(sMeetOrSliceStrings); i++) {
    if (aMeetOrSlice.EqualsASCII(sMeetOrSliceStrings[i])) {
      return (i + SVG_MEETORSLICE_MIN_VALID);
    }
  }

  return SVG_MEETORSLICE_UNKNOWN;
}

/* static */ nsresult SVGPreserveAspectRatio::FromString(
    const nsAString& aString, SVGPreserveAspectRatio* aValue) {
  nsWhitespaceTokenizerTemplate<nsContentUtils::IsHTMLWhitespace> tokenizer(
      aString);
  if (tokenizer.whitespaceBeforeFirstToken() || !tokenizer.hasMoreTokens()) {
    return NS_ERROR_DOM_SYNTAX_ERR;
  }
  const nsAString& token = tokenizer.nextToken();

  nsresult rv;
  SVGPreserveAspectRatio val;

  rv = val.SetAlign(GetAlignForString(token));

  if (NS_FAILED(rv)) {
    return NS_ERROR_DOM_SYNTAX_ERR;
  }

  if (tokenizer.hasMoreTokens()) {
    rv = val.SetMeetOrSlice(GetMeetOrSliceForString(tokenizer.nextToken()));
    if (NS_FAILED(rv)) {
      return NS_ERROR_DOM_SYNTAX_ERR;
    }
  } else {
    val.SetMeetOrSlice(SVG_MEETORSLICE_MEET);
  }

  if (tokenizer.whitespaceAfterCurrentToken()) {
    return NS_ERROR_DOM_SYNTAX_ERR;
  }

  *aValue = val;
  return NS_OK;
}

void SVGPreserveAspectRatio::ToString(nsAString& aValueAsString) const {
  MOZ_ASSERT(mAlign >= SVG_ALIGN_MIN_VALID && mAlign <= SVG_ALIGN_MAX_VALID,
             "Unknown align");
  aValueAsString.AssignASCII(sAlignStrings[mAlign - SVG_ALIGN_MIN_VALID]);

  if (mAlign != uint8_t(SVG_PRESERVEASPECTRATIO_NONE)) {
    MOZ_ASSERT(mMeetOrSlice >= SVG_MEETORSLICE_MIN_VALID &&
                   mMeetOrSlice <= SVG_MEETORSLICE_MAX_VALID,
               "Unknown meetOrSlice");
    aValueAsString.Append(' ');
    aValueAsString.AppendASCII(
        sMeetOrSliceStrings[mMeetOrSlice - SVG_MEETORSLICE_MIN_VALID]);
  }
}

bool SVGPreserveAspectRatio::operator==(
    const SVGPreserveAspectRatio& aOther) const {
  return mAlign == aOther.mAlign && mMeetOrSlice == aOther.mMeetOrSlice;
}

JSObject* DOMSVGPreserveAspectRatio::WrapObject(
    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  return mozilla::dom::SVGPreserveAspectRatio_Binding::Wrap(aCx, this,
                                                            aGivenProto);
}

uint16_t DOMSVGPreserveAspectRatio::Align() {
  if (mIsBaseValue) {
    return mVal->GetBaseValue().GetAlign();
  }

  mSVGElement->FlushAnimations();
  return mVal->GetAnimValue().GetAlign();
}

void DOMSVGPreserveAspectRatio::SetAlign(uint16_t aAlign, ErrorResult& rv) {
  if (!mIsBaseValue) {
    rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
    return;
  }
  rv = mVal->SetBaseAlign(aAlign, mSVGElement);
}

uint16_t DOMSVGPreserveAspectRatio::MeetOrSlice() {
  if (mIsBaseValue) {
    return mVal->GetBaseValue().GetMeetOrSlice();
  }

  mSVGElement->FlushAnimations();
  return mVal->GetAnimValue().GetMeetOrSlice();
}

void DOMSVGPreserveAspectRatio::SetMeetOrSlice(uint16_t aMeetOrSlice,
                                               ErrorResult& rv) {
  if (!mIsBaseValue) {
    rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
    return;
  }
  rv = mVal->SetBaseMeetOrSlice(aMeetOrSlice, mSVGElement);
}