layout/style/FontFaceSetIterator.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 "mozilla/dom/FontFaceSetIterator.h"
   8
   9 #include "js/Array.h"  // JS::NewArrayObject
  10
  11 namespace mozilla {
  12 namespace dom {
  13
  14 NS_IMPL_CYCLE_COLLECTION(FontFaceSetIterator, mFontFaceSet)
  15
  16 FontFaceSetIterator::FontFaceSetIterator(FontFaceSet* aFontFaceSet,
  17                                          bool aIsKeyAndValue)
  18     : mFontFaceSet(aFontFaceSet),
  19       mNextIndex(0),
  20       mIsKeyAndValue(aIsKeyAndValue) {
  21   MOZ_COUNT_CTOR(FontFaceSetIterator);
  22 }
  23
  24 FontFaceSetIterator::~FontFaceSetIterator() {
  25   MOZ_COUNT_DTOR(FontFaceSetIterator);
  26 }
  27
  28 bool FontFaceSetIterator::WrapObject(JSContext* aCx,
  29                                      JS::Handle<JSObject*> aGivenProto,
  30                                      JS::MutableHandle<JSObject*> aReflector) {
  31   return FontFaceSetIterator_Binding::Wrap(aCx, this, aGivenProto, aReflector);
  32 }
  33
  34 void FontFaceSetIterator::Next(JSContext* aCx,
  35                                FontFaceSetIteratorResult& aResult,
  36                                ErrorResult& aRv) {
  37   if (!mFontFaceSet) {
  38     aResult.mDone = true;
  39     return;
  40   }
  41
  42   // Skip over non-Author origin fonts (GetFontFaceAt returns nullptr
  43   // for those).
  44   FontFace* face;
  45   while (!(face = mFontFaceSet->GetFontFaceAt(mNextIndex++))) {
  46     if (mNextIndex >= mFontFaceSet->SizeIncludingNonAuthorOrigins()) {
  47       break;  // this iterator is done
  48     }
  49   }
  50
  51   if (!face) {
  52     aResult.mValue.setUndefined();
  53     aResult.mDone = true;
  54     mFontFaceSet = nullptr;
  55     return;
  56   }
  57
  58   JS::Rooted<JS::Value> value(aCx);
  59   if (!ToJSValue(aCx, face, &value)) {
  60     aRv.Throw(NS_ERROR_FAILURE);
  61     return;
  62   }
  63
  64   if (mIsKeyAndValue) {
  65     JS::RootedValueArray<2> values(aCx);
  66     values[0].set(value);
  67     values[1].set(value);
  68
  69     JS::Rooted<JSObject*> array(aCx);
  70     array = JS::NewArrayObject(aCx, values);
  71     if (array) {
  72       aResult.mValue.setObject(*array);
  73     }
  74   } else {
  75     aResult.mValue = value;
  76   }
  77
  78   aResult.mDone = false;
  79 }
  80
  81 }  // namespace dom
  82 }  // namespace mozilla