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

SkTypeface* SkFontMgr_DirectWrite::onLegacyCreateTypeface(const char familyName[],
                                                          SkFontStyle style) const {
    SkTScopedComPtr<IDWriteFontFamily> fontFamily;
    if (familyName) {
        SkSMallocWCHAR wideFamilyName;
        if (SUCCEEDED(sk_cstring_to_wchar(familyName, &wideFamilyName))) {
            this->getByFamilyName(wideFamilyName, &fontFamily);
        }
    }

    if (nullptr == fontFamily.get()) {
        // No family with given name, try default.
        this->getDefaultFontFamily(&fontFamily);
    }

    if (nullptr == fontFamily.get()) {
        // Could not obtain the default font.
        HRNM(fFontCollection->GetFontFamily(0, &fontFamily),
             "Could not get default-default font family.");
    }

    SkTScopedComPtr<IDWriteFont> font;
    DWriteStyle dwStyle(style);
    HRNM(fontFamily->GetFirstMatchingFont(dwStyle.fWeight, dwStyle.fWidth, dwStyle.fSlant, &font),
         "Could not get matching font.");

    SkTScopedComPtr<IDWriteFontFace> fontFace;
    HRNM(font->CreateFontFace(&fontFace), "Could not create font face.");

    return this->createTypefaceFromDWriteFont(fontFace.get(), font.get(), fontFamily.get());
}

SkTypeface* SkFontStyleSet_DirectWrite::matchStyle(const SkFontStyle& pattern) {
    DWRITE_FONT_STYLE slant;
    switch (pattern.slant()) {
    case SkFontStyle::kUpright_Slant:
        slant = DWRITE_FONT_STYLE_NORMAL;
        break;
    case SkFontStyle::kItalic_Slant:
        slant = DWRITE_FONT_STYLE_ITALIC;
        break;
    default:
        SkASSERT(false);
    }

    DWRITE_FONT_WEIGHT weight = (DWRITE_FONT_WEIGHT)pattern.weight();
    DWRITE_FONT_STRETCH width = (DWRITE_FONT_STRETCH)pattern.width();

    SkTScopedComPtr<IDWriteFont> font;
    // TODO: perhaps use GetMatchingFonts and get the least simulated?
    HRNM(fFontFamily->GetFirstMatchingFont(weight, width, slant, &font),
         "Could not match font in family.");

    SkTScopedComPtr<IDWriteFontFace> fontFace;
    HRNM(font->CreateFontFace(&fontFace), "Could not create font face.");

    return fFontMgr->createTypefaceFromDWriteFont(fontFace.get(), font.get(),
                                                  fFontFamily.get());
}

SkTypeface* SkFontStyleSet_DirectWrite::createTypeface(int index) {
    SkTScopedComPtr<IDWriteFont> font;
    HRNM(fFontFamily->GetFont(index, &font), "Could not get font.");

    SkTScopedComPtr<IDWriteFontFace> fontFace;
    HRNM(font->CreateFontFace(&fontFace), "Could not create font face.");

    return fFontMgr->createTypefaceFromDWriteFont(fontFace.get(), font.get(), fFontFamily.get());
}

SkTypeface* SkFontStyleSet_DirectWrite::matchStyle(const SkFontStyle& pattern) {
    SkTScopedComPtr<IDWriteFont> font;
    DWriteStyle dwStyle(pattern);
    // TODO: perhaps use GetMatchingFonts and get the least simulated?
    HRNM(fFontFamily->GetFirstMatchingFont(dwStyle.fWeight, dwStyle.fWidth, dwStyle.fSlant, &font),
         "Could not match font in family.");

    SkTScopedComPtr<IDWriteFontFace> fontFace;
    HRNM(font->CreateFontFace(&fontFace), "Could not create font face.");

    return fFontMgr->createTypefaceFromDWriteFont(fontFace.get(), font.get(),
                                                  fFontFamily.get());
}

SkTypeface* SkFontMgr_DirectWrite::onCreateFromStream(SkStreamAsset* stream, int ttcIndex) const {
    SkTScopedComPtr<StreamFontFileLoader> fontFileLoader;
    // This transfers ownership of stream to the new object.
    HRN(StreamFontFileLoader::Create(stream, &fontFileLoader));
    HRN(fFactory->RegisterFontFileLoader(fontFileLoader.get()));
    SkAutoIDWriteUnregister<StreamFontFileLoader> autoUnregisterFontFileLoader(
        fFactory.get(), fontFileLoader.get());

    SkTScopedComPtr<StreamFontCollectionLoader> fontCollectionLoader;
    HRN(StreamFontCollectionLoader::Create(fontFileLoader.get(), &fontCollectionLoader));
    HRN(fFactory->RegisterFontCollectionLoader(fontCollectionLoader.get()));
    SkAutoIDWriteUnregister<StreamFontCollectionLoader> autoUnregisterFontCollectionLoader(
        fFactory.get(), fontCollectionLoader.get());

    SkTScopedComPtr<IDWriteFontCollection> fontCollection;
    HRN(fFactory->CreateCustomFontCollection(fontCollectionLoader.get(), nullptr, 0, &fontCollection));

    // Find the first non-simulated font which has the given ttc index.
    UINT32 familyCount = fontCollection->GetFontFamilyCount();
    for (UINT32 familyIndex = 0; familyIndex < familyCount; ++familyIndex) {
        SkTScopedComPtr<IDWriteFontFamily> fontFamily;
        HRN(fontCollection->GetFontFamily(familyIndex, &fontFamily));

        UINT32 fontCount = fontFamily->GetFontCount();
        for (UINT32 fontIndex = 0; fontIndex < fontCount; ++fontIndex) {
            SkTScopedComPtr<IDWriteFont> font;
            HRN(fontFamily->GetFont(fontIndex, &font));
            if (font->GetSimulations() != DWRITE_FONT_SIMULATIONS_NONE) {
                continue;
            }

            SkTScopedComPtr<IDWriteFontFace> fontFace;
            HRN(font->CreateFontFace(&fontFace));

            UINT32 faceIndex = fontFace->GetIndex();
            if (faceIndex == ttcIndex) {
                return DWriteFontTypeface::Create(fFactory.get(),
                                                  fontFace.get(), font.get(), fontFamily.get(),
                                                  autoUnregisterFontFileLoader.detatch(),
                                                  autoUnregisterFontCollectionLoader.detatch());
            }
        }
    }

    return nullptr;
}

SkTypeface* SkFontMgr_DirectWrite::onLegacyCreateTypeface(const char familyName[],
                                                          unsigned styleBits) const {
    SkTScopedComPtr<IDWriteFontFamily> fontFamily;
    if (familyName) {
        SkSMallocWCHAR wideFamilyName;
        if (SUCCEEDED(sk_cstring_to_wchar(familyName, &wideFamilyName))) {
            this->getByFamilyName(wideFamilyName, &fontFamily);
        }
    }

    if (NULL == fontFamily.get()) {
        // No family with given name, try default.
        HRNM(this->getDefaultFontFamily(&fontFamily), "Could not get default font family.");
    }

    if (NULL == fontFamily.get()) {
        // Could not obtain the default font.
        HRNM(fFontCollection->GetFontFamily(0, &fontFamily),
             "Could not get default-default font family.");
    }

    SkTScopedComPtr<IDWriteFont> font;
    DWRITE_FONT_WEIGHT weight = (styleBits & SkTypeface::kBold)
                              ? DWRITE_FONT_WEIGHT_BOLD
                              : DWRITE_FONT_WEIGHT_NORMAL;
    DWRITE_FONT_STRETCH stretch = DWRITE_FONT_STRETCH_NORMAL;
    DWRITE_FONT_STYLE italic = (styleBits & SkTypeface::kItalic)
                             ? DWRITE_FONT_STYLE_ITALIC
                             : DWRITE_FONT_STYLE_NORMAL;
    HRNM(fontFamily->GetFirstMatchingFont(weight, stretch, italic, &font),
         "Could not get matching font.");

    SkTScopedComPtr<IDWriteFontFace> fontFace;
    HRNM(font->CreateFontFace(&fontFace), "Could not create font face.");

    return this->createTypefaceFromDWriteFont(fontFace.get(), font.get(), fontFamily.get());
}

SkTypeface* SkFontMgr_DirectWrite::onMatchFamilyStyleCharacter(const char familyName[],
                                                               const SkFontStyle& style,
                                                               const char* bcp47[], int bcp47Count,
                                                               SkUnichar character) const
{
    const DWriteStyle dwStyle(style);

    const WCHAR* dwFamilyName = nullptr;
    SkSMallocWCHAR dwFamilyNameLocal;
    if (familyName) {
        HRN(sk_cstring_to_wchar(familyName, &dwFamilyNameLocal));
        dwFamilyName = dwFamilyNameLocal;
    }

    WCHAR str[16];
    UINT32 strLen = static_cast<UINT32>(
        SkUTF16_FromUnichar(character, reinterpret_cast<uint16_t*>(str)));

    const SkSMallocWCHAR* dwBcp47;
    SkSMallocWCHAR dwBcp47Local;
    if (bcp47Count < 1) {
        dwBcp47 = &fLocaleName;
    } else {
        // TODO: support fallback stack.
        // TODO: DirectWrite supports 'zh-CN' or 'zh-Hans', but 'zh' misses completely
        // and may produce a Japanese font.
        HRN(sk_cstring_to_wchar(bcp47[bcp47Count - 1], &dwBcp47Local));
        dwBcp47 = &dwBcp47Local;
    }

    if (fFactory2.get()) {
        SkTScopedComPtr<IDWriteFontFallback> systemFontFallback;
        IDWriteFontFallback* fontFallback = fFontFallback.get();
        if (!fontFallback) {
            HRNM(fFactory2->GetSystemFontFallback(&systemFontFallback),
                 "Could not get system fallback.");
            fontFallback = systemFontFallback.get();
        }

        SkTScopedComPtr<IDWriteNumberSubstitution> numberSubstitution;
        HRNM(fFactory2->CreateNumberSubstitution(DWRITE_NUMBER_SUBSTITUTION_METHOD_NONE, nullptr, TRUE,
                                                 &numberSubstitution),
             "Could not create number substitution.");
        SkTScopedComPtr<FontFallbackSource> fontFallbackSource(
            new FontFallbackSource(str, strLen, *dwBcp47, numberSubstitution.get()));

        UINT32 mappedLength;
        SkTScopedComPtr<IDWriteFont> font;
        FLOAT scale;
        HRNM(fontFallback->MapCharacters(fontFallbackSource.get(),
                                         0, // textPosition,
                                         strLen,
                                         fFontCollection.get(),
                                         dwFamilyName,
                                         dwStyle.fWeight,
                                         dwStyle.fSlant,
                                         dwStyle.fWidth,
                                         &mappedLength,
                                         &font,
                                         &scale),
             "Could not map characters");
        if (!font.get()) {
            return nullptr;
        }

        SkTScopedComPtr<IDWriteFontFace> fontFace;
        HRNM(font->CreateFontFace(&fontFace), "Could not get font face from font.");

        SkTScopedComPtr<IDWriteFontFamily> fontFamily;
        HRNM(font->GetFontFamily(&fontFamily), "Could not get family from font.");
        return this->createTypefaceFromDWriteFont(fontFace.get(), font.get(), fontFamily.get());
    }

    SkTScopedComPtr<IDWriteTextFormat> fallbackFormat;
    HRNM(fFactory->CreateTextFormat(dwFamilyName ? dwFamilyName : L"",
                                    fFontCollection.get(),
                                    dwStyle.fWeight,
                                    dwStyle.fSlant,
                                    dwStyle.fWidth,
                                    72.0f,
                                    *dwBcp47,
                                    &fallbackFormat),
         "Could not create text format.");

    SkTScopedComPtr<IDWriteTextLayout> fallbackLayout;
    HRNM(fFactory->CreateTextLayout(str, strLen, fallbackFormat.get(),
                                    200.0f, 200.0f,
                                    &fallbackLayout),
         "Could not create text layout.");

    SkTScopedComPtr<FontFallbackRenderer> fontFallbackRenderer(
        new FontFallbackRenderer(this, character));

    HRNM(fallbackLayout->Draw(nullptr, fontFallbackRenderer.get(), 50.0f, 50.0f),
         "Could not draw layout with renderer.");

    return fontFallbackRenderer->FallbackTypeface();
}