C++ AutoTArray::Clear方法代码示例

// static
already_AddRefed<InternalHeaders>
InternalHeaders::CORSHeaders(InternalHeaders* aHeaders)
{
  RefPtr<InternalHeaders> cors = new InternalHeaders(aHeaders->mGuard);
  ErrorResult result;

  nsAutoCString acExposedNames;
  aHeaders->Get(NS_LITERAL_CSTRING("Access-Control-Expose-Headers"), acExposedNames, result);
  MOZ_ASSERT(!result.Failed());

  AutoTArray<nsCString, 5> exposeNamesArray;
  nsCCharSeparatedTokenizer exposeTokens(acExposedNames, ',');
  while (exposeTokens.hasMoreTokens()) {
    const nsDependentCSubstring& token = exposeTokens.nextToken();
    if (token.IsEmpty()) {
      continue;
    }

    if (!NS_IsValidHTTPToken(token)) {
      NS_WARNING("Got invalid HTTP token in Access-Control-Expose-Headers. Header value is:");
      NS_WARNING(acExposedNames.get());
      exposeNamesArray.Clear();
      break;
    }

    exposeNamesArray.AppendElement(token);
  }

  nsCaseInsensitiveCStringArrayComparator comp;
  for (uint32_t i = 0; i < aHeaders->mList.Length(); ++i) {
    const Entry& entry = aHeaders->mList[i];
    if (entry.mName.EqualsASCII("cache-control") ||
        entry.mName.EqualsASCII("content-language") ||
        entry.mName.EqualsASCII("content-type") ||
        entry.mName.EqualsASCII("expires") ||
        entry.mName.EqualsASCII("last-modified") ||
        entry.mName.EqualsASCII("pragma") ||
        exposeNamesArray.Contains(entry.mName, comp)) {
      cors->Append(entry.mName, entry.mValue, result);
      MOZ_ASSERT(!result.Failed());
    }
  }

  return cors.forget();
}

//.........这里部分代码省略.........
                         "character/glyph clump contains no characters!");
        if (charStart == charEnd) {
            glyphStart = glyphEnd; // this is bad - we'll discard the glyph(s),
                                   // as there's nowhere to attach them
            continue;
        }

        // Now charStart..charEnd is a ligature clump, corresponding to glyphStart..glyphEnd;
        // Set baseCharIndex to the char we'll actually attach the glyphs to (1st of ligature),
        // and endCharIndex to the limit (position beyond the last char),
        // adjusting for the offset of the stringRange relative to the textRun.
        int32_t baseCharIndex, endCharIndex;
        if (isRightToLeft) {
            while (charEnd >= 0 && charToGlyph[charEnd] == NO_GLYPH) {
                charEnd--;
            }
            baseCharIndex = charEnd + stringRange.location - aStringOffset + 1;
            endCharIndex = charStart + stringRange.location - aStringOffset + 1;
        } else {
            while (charEnd < stringRange.length && charToGlyph[charEnd] == NO_GLYPH) {
                charEnd++;
            }
            baseCharIndex = charStart + stringRange.location - aStringOffset;
            endCharIndex = charEnd + stringRange.location - aStringOffset;
        }

        // Then we check if the clump falls outside our actual string range; if so, just go to the next.
        if (endCharIndex <= 0 || baseCharIndex >= wordLength) {
            glyphStart = glyphEnd;
            charStart = charEnd;
            continue;
        }
        // Ensure we won't try to go beyond the valid length of the word's text
        baseCharIndex = std::max(baseCharIndex, 0);
        endCharIndex = std::min(endCharIndex, wordLength);

        // Now we're ready to set the glyph info in the textRun; measure the glyph width
        // of the first (perhaps only) glyph, to see if it is "Simple"
        int32_t appUnitsPerDevUnit = aShapedText->GetAppUnitsPerDevUnit();
        double toNextGlyph;
        if (glyphStart < numGlyphs-1) {
            toNextGlyph = positions[glyphStart+1].x - positions[glyphStart].x;
        } else {
            toNextGlyph = positions[0].x + runWidth - positions[glyphStart].x;
        }
        int32_t advance = int32_t(toNextGlyph * appUnitsPerDevUnit);

        // Check if it's a simple one-to-one mapping
        int32_t glyphsInClump = glyphEnd - glyphStart;
        if (glyphsInClump == 1 &&
            gfxTextRun::CompressedGlyph::IsSimpleGlyphID(glyphs[glyphStart]) &&
            gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
            charGlyphs[baseCharIndex].IsClusterStart() &&
            positions[glyphStart].y == 0.0)
        {
            charGlyphs[baseCharIndex].SetSimpleGlyph(advance,
                                                     glyphs[glyphStart]);
        } else {
            // collect all glyphs in a list to be assigned to the first char;
            // there must be at least one in the clump, and we already measured its advance,
            // hence the placement of the loop-exit test and the measurement of the next glyph
            while (1) {
                gfxTextRun::DetailedGlyph *details = detailedGlyphs.AppendElement();
                details->mGlyphID = glyphs[glyphStart];
                details->mXOffset = 0;
                details->mYOffset = -positions[glyphStart].y * appUnitsPerDevUnit;
                details->mAdvance = advance;
                if (++glyphStart >= glyphEnd) {
                   break;
                }
                if (glyphStart < numGlyphs-1) {
                    toNextGlyph = positions[glyphStart+1].x - positions[glyphStart].x;
                } else {
                    toNextGlyph = positions[0].x + runWidth - positions[glyphStart].x;
                }
                advance = int32_t(toNextGlyph * appUnitsPerDevUnit);
            }

            gfxTextRun::CompressedGlyph textRunGlyph;
            textRunGlyph.SetComplex(charGlyphs[baseCharIndex].IsClusterStart(),
                                    true, detailedGlyphs.Length());
            aShapedText->SetGlyphs(aOffset + baseCharIndex, textRunGlyph,
                                   detailedGlyphs.Elements());

            detailedGlyphs.Clear();
        }

        // the rest of the chars in the group are ligature continuations, no associated glyphs
        while (++baseCharIndex != endCharIndex && baseCharIndex < wordLength) {
            gfxShapedText::CompressedGlyph &shapedTextGlyph = charGlyphs[baseCharIndex];
            NS_ASSERTION(!shapedTextGlyph.IsSimpleGlyph(), "overwriting a simple glyph");
            shapedTextGlyph.SetComplex(inOrder && shapedTextGlyph.IsClusterStart(), false, 0);
        }

        glyphStart = glyphEnd;
        charStart = charEnd;
    }

    return NS_OK;
}

gfxFontconfigUtils::LangSupportEntry *
gfxFontconfigUtils::GetLangSupportEntry(const FcChar8 *aLang, bool aWithFonts)
{
    // Currently any unrecognized languages from documents will be converted
    // to x-unicode by nsILanguageAtomService, so there is a limit on the
    // langugages that will be added here.  Reconsider when/if document
    // languages are passed to this routine.

    LangSupportEntry *entry = mLangSupportTable.PutEntry(aLang);
    if (!entry)
        return nullptr;

    FcLangResult best = FcLangDifferentLang;

    if (!entry->IsKeyInitialized()) {
        entry->InitKey(aLang);
    } else {
        // mSupport is already initialized.
        if (!aWithFonts)
            return entry;

        best = entry->mSupport;
        // If there is support for this language, an empty font list indicates
        // that the list hasn't been initialized yet.
        if (best == FcLangDifferentLang || entry->mFonts.Length() > 0)
            return entry;
    }

    // These FcFontSets are owned by fontconfig
    FcFontSet *fontSets[] = {
        FcConfigGetFonts(nullptr, FcSetSystem)
#ifdef MOZ_BUNDLED_FONTS
        , FcConfigGetFonts(nullptr, FcSetApplication)
#endif
    };

    AutoTArray<FcPattern*,100> fonts;

    for (unsigned fs = 0; fs < ArrayLength(fontSets); ++fs) {
        FcFontSet *fontSet = fontSets[fs];
        if (!fontSet) {
            continue;
        }
        for (int f = 0; f < fontSet->nfont; ++f) {
            FcPattern *font = fontSet->fonts[f];

            FcLangResult support = GetLangSupport(font, aLang);

            if (support < best) { // lower is better
                best = support;
                if (aWithFonts) {
                    fonts.Clear();
                } else if (best == FcLangEqual) {
                    break;
                }
            }

            // The font list in the LangSupportEntry is expected to be used
            // only when no default fonts support the language.  There would
            // be a large number of fonts in entries for languages using Latin
            // script but these do not need to be created because default
            // fonts already support these languages.
            if (aWithFonts && support != FcLangDifferentLang &&
                support == best) {
                fonts.AppendElement(font);
            }
        }
    }

    entry->mSupport = best;
    if (aWithFonts) {
        if (fonts.Length() != 0) {
            entry->mFonts.AppendElements(fonts.Elements(), fonts.Length());
        } else if (best != FcLangDifferentLang) {
            // Previously there was a font that supported this language at the
            // level of entry->mSupport, but it has now disappeared.  At least
            // entry->mSupport needs to be recalculated, but this is an
            // indication that the set of installed fonts has changed, so
            // update all caches.
            mLastConfig = nullptr; // invalidates caches
            UpdateFontListInternal(true);
            return GetLangSupportEntry(aLang, aWithFonts);
        }
    }

    return entry;
}