tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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FontFaceSetIterator.cpp (2306B)

      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