C++ SkTScopedComPtr::GetStringLength方法代码示例

void DWriteFontTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
                                             bool* isLocalStream) const {
    // Get the family name.
    SkTScopedComPtr<IDWriteLocalizedStrings> dwFamilyNames;
    HRV(fDWriteFontFamily->GetFamilyNames(&dwFamilyNames));

    UINT32 dwFamilyNamesLength;
    HRV(dwFamilyNames->GetStringLength(0, &dwFamilyNamesLength));

    SkSMallocWCHAR dwFamilyNameChar(dwFamilyNamesLength+1);
    HRV(dwFamilyNames->GetString(0, dwFamilyNameChar.get(), dwFamilyNamesLength+1));

    SkString utf8FamilyName;
    HRV(sk_wchar_to_skstring(dwFamilyNameChar.get(), &utf8FamilyName));

    desc->setFamilyName(utf8FamilyName.c_str());
    *isLocalStream = SkToBool(fDWriteFontFileLoader.get());
}

static bool FindByDWriteFont(SkTypeface* cached, void* ctx) {
    DWriteFontTypeface* cshFace = reinterpret_cast<DWriteFontTypeface*>(cached);
    ProtoDWriteTypeface* ctxFace = reinterpret_cast<ProtoDWriteTypeface*>(ctx);
    bool same;

    //Check to see if the two fonts are identical.
    HRB(are_same(cshFace->fDWriteFont.get(), ctxFace->fDWriteFont, same));
    if (same) {
        return true;
    }

    HRB(are_same(cshFace->fDWriteFontFace.get(), ctxFace->fDWriteFontFace, same));
    if (same) {
        return true;
    }

    //Check if the two fonts share the same loader and have the same key.
    UINT32 cshNumFiles;
    UINT32 ctxNumFiles;
    HRB(cshFace->fDWriteFontFace->GetFiles(&cshNumFiles, nullptr));
    HRB(ctxFace->fDWriteFontFace->GetFiles(&ctxNumFiles, nullptr));
    if (cshNumFiles != ctxNumFiles) {
        return false;
    }

    SkTScopedComPtr<IDWriteFontFile> cshFontFile;
    SkTScopedComPtr<IDWriteFontFile> ctxFontFile;
    HRB(cshFace->fDWriteFontFace->GetFiles(&cshNumFiles, &cshFontFile));
    HRB(ctxFace->fDWriteFontFace->GetFiles(&ctxNumFiles, &ctxFontFile));

    //for (each file) { //we currently only admit fonts from one file.
    SkTScopedComPtr<IDWriteFontFileLoader> cshFontFileLoader;
    SkTScopedComPtr<IDWriteFontFileLoader> ctxFontFileLoader;
    HRB(cshFontFile->GetLoader(&cshFontFileLoader));
    HRB(ctxFontFile->GetLoader(&ctxFontFileLoader));
    HRB(are_same(cshFontFileLoader.get(), ctxFontFileLoader.get(), same));
    if (!same) {
        return false;
    }
    //}

    const void* cshRefKey;
    UINT32 cshRefKeySize;
    const void* ctxRefKey;
    UINT32 ctxRefKeySize;
    HRB(cshFontFile->GetReferenceKey(&cshRefKey, &cshRefKeySize));
    HRB(ctxFontFile->GetReferenceKey(&ctxRefKey, &ctxRefKeySize));
    if (cshRefKeySize != ctxRefKeySize) {
        return false;
    }
    if (0 != memcmp(cshRefKey, ctxRefKey, ctxRefKeySize)) {
        return false;
    }

    //TODO: better means than comparing name strings?
    //NOTE: .ttc and fake bold/italic will end up here.
    SkTScopedComPtr<IDWriteLocalizedStrings> cshFamilyNames;
    SkTScopedComPtr<IDWriteLocalizedStrings> cshFaceNames;
    HRB(cshFace->fDWriteFontFamily->GetFamilyNames(&cshFamilyNames));
    HRB(cshFace->fDWriteFont->GetFaceNames(&cshFaceNames));
    UINT32 cshFamilyNameLength;
    UINT32 cshFaceNameLength;
    HRB(cshFamilyNames->GetStringLength(0, &cshFamilyNameLength));
    HRB(cshFaceNames->GetStringLength(0, &cshFaceNameLength));

    SkTScopedComPtr<IDWriteLocalizedStrings> ctxFamilyNames;
    SkTScopedComPtr<IDWriteLocalizedStrings> ctxFaceNames;
    HRB(ctxFace->fDWriteFontFamily->GetFamilyNames(&ctxFamilyNames));
    HRB(ctxFace->fDWriteFont->GetFaceNames(&ctxFaceNames));
    UINT32 ctxFamilyNameLength;
    UINT32 ctxFaceNameLength;
    HRB(ctxFamilyNames->GetStringLength(0, &ctxFamilyNameLength));
    HRB(ctxFaceNames->GetStringLength(0, &ctxFaceNameLength));

    if (cshFamilyNameLength != ctxFamilyNameLength ||
        cshFaceNameLength != ctxFaceNameLength)
    {
        return false;
    }

    SkSMallocWCHAR cshFamilyName(cshFamilyNameLength+1);
    SkSMallocWCHAR cshFaceName(cshFaceNameLength+1);
    HRB(cshFamilyNames->GetString(0, cshFamilyName.get(), cshFamilyNameLength+1));
    HRB(cshFaceNames->GetString(0, cshFaceName.get(), cshFaceNameLength+1));

    SkSMallocWCHAR ctxFamilyName(ctxFamilyNameLength+1);
    SkSMallocWCHAR ctxFaceName(ctxFaceNameLength+1);
    HRB(ctxFamilyNames->GetString(0, ctxFamilyName.get(), ctxFamilyNameLength+1));
    HRB(ctxFaceNames->GetString(0, ctxFaceName.get(), ctxFaceNameLength+1));

    return wcscmp(cshFamilyName.get(), ctxFamilyName.get()) == 0 &&
           wcscmp(cshFaceName.get(), ctxFaceName.get()) == 0;
}

SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics(
        PerGlyphInfo perGlyphInfo,
        const uint32_t* glyphIDs,
        uint32_t glyphIDsCount) const {

    SkAdvancedTypefaceMetrics* info = nullptr;

    HRESULT hr = S_OK;

    const unsigned glyphCount = fDWriteFontFace->GetGlyphCount();

    DWRITE_FONT_METRICS dwfm;
    fDWriteFontFace->GetMetrics(&dwfm);

    info = new SkAdvancedTypefaceMetrics;
    info->fEmSize = dwfm.designUnitsPerEm;
    info->fLastGlyphID = SkToU16(glyphCount - 1);

    info->fAscent = SkToS16(dwfm.ascent);
    info->fDescent = SkToS16(dwfm.descent);
    info->fCapHeight = SkToS16(dwfm.capHeight);

    // SkAdvancedTypefaceMetrics::fFontName is in theory supposed to be
    // the PostScript name of the font. However, due to the way it is currently
    // used, it must actually be a family name.
    SkTScopedComPtr<IDWriteLocalizedStrings> familyNames;
    hr = fDWriteFontFamily->GetFamilyNames(&familyNames);

    UINT32 familyNameLen;
    hr = familyNames->GetStringLength(0, &familyNameLen);

    SkSMallocWCHAR familyName(familyNameLen+1);
    hr = familyNames->GetString(0, familyName.get(), familyNameLen+1);

    hr = sk_wchar_to_skstring(familyName.get(), familyNameLen, &info->fFontName);

    if (perGlyphInfo & kToUnicode_PerGlyphInfo) {
        populate_glyph_to_unicode(fDWriteFontFace.get(), glyphCount, &(info->fGlyphToUnicode));
    }

    DWRITE_FONT_FACE_TYPE fontType = fDWriteFontFace->GetType();
    if (fontType != DWRITE_FONT_FACE_TYPE_TRUETYPE &&
        fontType != DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION)
    {
        return info;
    }

    // Simulated fonts aren't really TrueType fonts.
    if (fDWriteFontFace->GetSimulations() == DWRITE_FONT_SIMULATIONS_NONE) {
        info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font;
    }

    AutoTDWriteTable<SkOTTableHead> headTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTablePostScript> postTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableHorizontalHeader> hheaTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableOS2> os2Table(fDWriteFontFace.get());
    if (!headTable.fExists || !postTable.fExists || !hheaTable.fExists || !os2Table.fExists) {
        return info;
    }

    //There exist CJK fonts which set the IsFixedPitch and Monospace bits,
    //but have full width, latin half-width, and half-width kana.
    bool fixedWidth = (postTable->isFixedPitch &&
                      (1 == SkEndian_SwapBE16(hheaTable->numberOfHMetrics)));
    //Monospace
    if (fixedWidth) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style;
    }
    //Italic
    if (os2Table->version.v0.fsSelection.field.Italic) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style;
    }
    //Serif
    using SerifStyle = SkPanose::Data::TextAndDisplay::SerifStyle;
    SerifStyle serifStyle = os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle;
    if (SkPanose::FamilyType::TextAndDisplay == os2Table->version.v0.panose.bFamilyType) {
        if (SerifStyle::Cove == serifStyle ||
            SerifStyle::ObtuseCove == serifStyle ||
            SerifStyle::SquareCove == serifStyle ||
            SerifStyle::ObtuseSquareCove == serifStyle ||
            SerifStyle::Square == serifStyle ||
            SerifStyle::Thin == serifStyle ||
            SerifStyle::Bone == serifStyle ||
            SerifStyle::Exaggerated == serifStyle ||
            SerifStyle::Triangle == serifStyle)
        {
            info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style;
        }
    //Script
    } else if (SkPanose::FamilyType::Script == os2Table->version.v0.panose.bFamilyType) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style;
    }

    info->fItalicAngle = SkEndian_SwapBE32(postTable->italicAngle) >> 16;

    info->fBBox = SkIRect::MakeLTRB((int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMin),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMin));
    return info;
//.........这里部分代码省略.........

SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics(
        PerGlyphInfo perGlyphInfo,
        const uint32_t* glyphIDs,
        uint32_t glyphIDsCount) const {

    SkAdvancedTypefaceMetrics* info = nullptr;

    HRESULT hr = S_OK;

    const unsigned glyphCount = fDWriteFontFace->GetGlyphCount();

    DWRITE_FONT_METRICS dwfm;
    fDWriteFontFace->GetMetrics(&dwfm);

    info = new SkAdvancedTypefaceMetrics;
    info->fEmSize = dwfm.designUnitsPerEm;
    info->fLastGlyphID = SkToU16(glyphCount - 1);

    // SkAdvancedTypefaceMetrics::fFontName is in theory supposed to be
    // the PostScript name of the font. However, due to the way it is currently
    // used, it must actually be a family name.
    SkTScopedComPtr<IDWriteLocalizedStrings> familyNames;
    hr = fDWriteFontFamily->GetFamilyNames(&familyNames);

    UINT32 familyNameLen;
    hr = familyNames->GetStringLength(0, &familyNameLen);

    SkSMallocWCHAR familyName(familyNameLen+1);
    hr = familyNames->GetString(0, familyName.get(), familyNameLen+1);

    hr = sk_wchar_to_skstring(familyName.get(), familyNameLen, &info->fFontName);

    if (perGlyphInfo & kToUnicode_PerGlyphInfo) {
        populate_glyph_to_unicode(fDWriteFontFace.get(), glyphCount, &(info->fGlyphToUnicode));
    }

    DWRITE_FONT_FACE_TYPE fontType = fDWriteFontFace->GetType();
    if (fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE ||
        fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION) {
        info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font;
    } else {
        info->fAscent = dwfm.ascent;
        info->fDescent = dwfm.descent;
        info->fCapHeight = dwfm.capHeight;
        return info;
    }

    AutoTDWriteTable<SkOTTableHead> headTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTablePostScript> postTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableHorizontalHeader> hheaTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableOS2> os2Table(fDWriteFontFace.get());
    if (!headTable.fExists || !postTable.fExists || !hheaTable.fExists || !os2Table.fExists) {
        info->fAscent = dwfm.ascent;
        info->fDescent = dwfm.descent;
        info->fCapHeight = dwfm.capHeight;
        return info;
    }

    //There exist CJK fonts which set the IsFixedPitch and Monospace bits,
    //but have full width, latin half-width, and half-width kana.
    bool fixedWidth = (postTable->isFixedPitch &&
                      (1 == SkEndian_SwapBE16(hheaTable->numberOfHMetrics)));
    //Monospace
    if (fixedWidth) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style;
    }
    //Italic
    if (os2Table->version.v0.fsSelection.field.Italic) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style;
    }
    //Script
    if (SkPanose::FamilyType::Script == os2Table->version.v0.panose.bFamilyType.value) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style;
    //Serif
    } else if (SkPanose::FamilyType::TextAndDisplay == os2Table->version.v0.panose.bFamilyType.value &&
               SkPanose::Data::TextAndDisplay::SerifStyle::Triangle <= os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value &&
               SkPanose::Data::TextAndDisplay::SerifStyle::NoFit != os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style;
    }

    info->fItalicAngle = SkEndian_SwapBE32(postTable->italicAngle) >> 16;

    info->fAscent = SkToS16(dwfm.ascent);
    info->fDescent = SkToS16(dwfm.descent);
    info->fCapHeight = SkToS16(dwfm.capHeight);

    info->fBBox = SkIRect::MakeLTRB((int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMin),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMin));

    //TODO: is this even desired? It seems PDF only wants this value for Type1
    //fonts, and we only get here for TrueType fonts.
    info->fStemV = 0;
    /*
    // Figure out a good guess for StemV - Min width of i, I, !, 1.
    // This probably isn't very good with an italic font.
    int16_t min_width = SHRT_MAX;
    info->fStemV = 0;
    char stem_chars[] = {'i', 'I', '!', '1'};
//.........这里部分代码省略.........