C++ IDWriteFontFamily类代码示例

ULONG GetBestFontAttributes(IDWriteFontCollection* fontCollection, const WCHAR* fontFamilyName, const FontFaceInfo& desiredAttributes)
{
    DWRITE_FONT_WEIGHT  fontWeight  = desiredAttributes.fontWeight;
    DWRITE_FONT_STYLE   fontStyle   = desiredAttributes.fontStyle;
    DWRITE_FONT_STRETCH fontStretch = desiredAttributes.fontStretch;

    IDWriteFontFamily*  fontFamily = NULL;
    IDWriteFont*        font = NULL;

    if (SUCCEEDED(GetFontFamily(fontCollection, fontFamilyName, &fontFamily)))
    {
        if (SUCCEEDED(fontFamily->GetFirstMatchingFont(fontWeight, fontStretch, fontStyle, &font)))
        {
            fontWeight = font->GetWeight();
            fontStyle = font->GetStyle();
            fontStretch = font->GetStretch();
        }
    }

    SafeRelease(&font);
    SafeRelease(&fontFamily);

    FontFaceInfo fontFaceInfo(L"", fontWeight, fontStyle, fontStretch);

    return fontFaceInfo.PackedFontAttributes();
}

    /* IDWriteGdiInterop methods */
    virtual HRESULT STDMETHODCALLTYPE CreateFontFromLOGFONT(
        LOGFONTW const *logFont,
        IDWriteFont **font)
    {
        OutputDebugString("delegate_dwrite_gdi_interop::CreateFontFromLOGFONT");
        HRESULT result;
        UINT32 index;
        BOOL exists;
        result = mycoll_->FindFamilyName(logFont->lfFaceName, &index, &exists);
        if (SUCCEEDED(result)) {
            result = E_FAIL;
            if (exists != FALSE) {
                IDWriteFontFamily *family;
                result = mycoll_->GetFontFamily(index, &family);
                if (SUCCEEDED(result)) {
                    result = family->GetFirstMatchingFont(
                        (DWRITE_FONT_WEIGHT)logFont->lfWeight,
                        DWRITE_FONT_STRETCH_NORMAL,
                        DWRITE_FONT_STYLE_NORMAL,
                        font);
                    iunknown_release(family);
                }
            }
        }
	if (FAILED(result)) {
            OutputDebugString("delegate_dwrite_gdi_interop::CreateFontFromLOGFONT -> fallback");
            result = orig_this->CreateFontFromLOGFONT(logFont, font);
        }
        return result; 
    }

static void familyChanged(struct fontDialog *f)
{
	LRESULT pos;
	BOOL selected;
	IDWriteFontFamily *family;
	IDWriteFont *font, *matchFont;
	DWRITE_FONT_WEIGHT weight;
	DWRITE_FONT_STYLE style;
	DWRITE_FONT_STRETCH stretch;
	UINT32 i, n;
	UINT32 matching;
	WCHAR *label;
	HRESULT hr;

	selected = cbGetCurSel(f->familyCombobox, &pos);
	if (!selected)		// on deselect, do nothing
		return;
	f->curFamily = pos;

	family = (IDWriteFontFamily *) cbGetItemData(f->familyCombobox, (WPARAM) (f->curFamily));

	// for the nearest style match
	// when we select a new family, we want the nearest style to the previously selected one to be chosen
	// this is how the Choose Font sample does it
	hr = family->GetFirstMatchingFont(
		f->weight,
		f->stretch,
		f->style,
		&matchFont);
	if (hr != S_OK)
		logHRESULT(L"error finding first matching font to previous style in font dialog", hr);
	// we can't just compare pointers; a "newly created" object comes out
	// the Choose Font sample appears to do this instead
	weight = matchFont->GetWeight();
	style = matchFont->GetStyle();
	stretch = matchFont->GetStretch();
	matchFont->Release();

	// TODO test mutliple streteches; all the fonts I have have only one stretch value?
	wipeStylesBox(f);
	n = family->GetFontCount();
	matching = 0;			// a safe/suitable default just in case
	for (i = 0; i < n; i++) {
		hr = family->GetFont(i, &font);
		if (hr != S_OK)
			logHRESULT(L"error getting font for filling styles box", hr);
		label = fontStyleName(f->fc, font);
		pos = cbAddString(f->styleCombobox, label);
		uiFree(label);
		cbSetItemData(f->styleCombobox, (WPARAM) pos, (LPARAM) font);
		if (font->GetWeight() == weight &&
			font->GetStyle() == style &&
			font->GetStretch() == stretch)
			matching = i;
	}

	// and now, load the match
	cbSetCurSel(f->styleCombobox, (WPARAM) matching);
	styleChanged(f);
}

    const float getFontHeightToEmSizeFactor(Font& font, IDWriteFontCollection& dwFontCollection)
    {
        // To set the font size factor, we need to get the font metrics
        BOOL fontFound;
        uint32 fontIndex;

        // Search for the font in the font collection using the font name
        HRESULT hr = dwFontCollection.FindFamilyName (font.getTypefaceName().toWideCharPointer(),
                                                      &fontIndex, &fontFound);
        if (! fontFound)
            fontIndex = 0;

        IDWriteFontFamily* dwFontFamily = nullptr;
        hr = dwFontCollection.GetFontFamily (fontIndex, &dwFontFamily);

        IDWriteFont* dwFont = nullptr;
        hr = dwFontFamily->GetFirstMatchingFont (DWRITE_FONT_WEIGHT_NORMAL,
                                                 DWRITE_FONT_STRETCH_NORMAL,
                                                 DWRITE_FONT_STYLE_NORMAL, &dwFont);
        IDWriteFontFace* dwFontFace = nullptr;
        hr = dwFont->CreateFontFace (&dwFontFace);

        // Font metrics are in font design units
        DWRITE_FONT_METRICS dwFontMetrics;
        dwFontFace->GetMetrics (&dwFontMetrics);
        const float totalHeight = std::abs ((float) dwFontMetrics.ascent) + std::abs ((float) dwFontMetrics.descent);
        const float fontHeightToEmSizeFactor = (float) dwFontMetrics.designUnitsPerEm / totalHeight;

        safeRelease (&dwFontFace);
        safeRelease (&dwFont);
        safeRelease (&dwFontFamily);

        return fontHeightToEmSizeFactor;
    }

bool CDirectWriteRenderer::GetFontMetrics(CDirectWriteFont &Font, FontMetrics *pMetrics)
{
	if (pMetrics == nullptr)
		return false;
	if (m_pRenderTarget == nullptr)
		return false;

	HRESULT hr = E_UNEXPECTED;
	IDWriteTextFormat *pTextFormat = Font.GetTextFormat();

	if (pTextFormat != nullptr) {
		IDWriteFontCollection *pFontCollection;

		hr = pTextFormat->GetFontCollection(&pFontCollection);
		if (SUCCEEDED(hr)) {
			WCHAR szName[256];

			hr = pTextFormat->GetFontFamilyName(szName, lengthof(szName));
			if (SUCCEEDED(hr)) {
				UINT32 Index;
				BOOL fExists;

				hr = pFontCollection->FindFamilyName(szName, &Index, &fExists);
				if (SUCCEEDED(hr)) {
					IDWriteFontFamily *pFontFamily;

					hr = pFontCollection->GetFontFamily(Index, &pFontFamily);
					if (SUCCEEDED(hr)) {
						IDWriteFont *pFont;

						hr = pFontFamily->GetFirstMatchingFont(
							pTextFormat->GetFontWeight(),
							pTextFormat->GetFontStretch(),
							pTextFormat->GetFontStyle(),
							&pFont);
						if (SUCCEEDED(hr)) {
							DWRITE_FONT_METRICS Metrics;

							pFont->GetMetrics(&Metrics);
							const float Ratio = pTextFormat->GetFontSize() / static_cast<float>(Metrics.designUnitsPerEm);
							pMetrics->Ascent = Metrics.ascent * Ratio;
							pMetrics->Descent = Metrics.descent * Ratio;
							pMetrics->LineGap = Metrics.lineGap * Ratio;

							pFont->Release();
						}

						pFontFamily->Release();
					}
				}
			}
		}

		pFontCollection->Release();
	}

	return SUCCEEDED(hr);
}

void QWindowsFontEngineDirectWrite::initFontInfo(const QFontDef &request,
        int dpi, IDWriteFont *font)
{
    fontDef = request;

    IDWriteFontFamily *fontFamily = NULL;
    HRESULT hr = font->GetFontFamily(&fontFamily);

    IDWriteLocalizedStrings *familyNames = NULL;
    if (SUCCEEDED(hr))
        hr = fontFamily->GetFamilyNames(&familyNames);

    UINT32 index = 0;

    if (SUCCEEDED(hr)) {
        BOOL exists = false;

        wchar_t localeName[LOCALE_NAME_MAX_LENGTH];
        int defaultLocaleSuccess = GetUserDefaultLocaleName(localeName, LOCALE_NAME_MAX_LENGTH);
        if (defaultLocaleSuccess)
            hr = familyNames->FindLocaleName(localeName, &index, &exists);

        if (SUCCEEDED(hr) && !exists)
            hr = familyNames->FindLocaleName(L"en-us", &index, &exists);

        if (!exists)
            index = 0;
    }

    // Get the family name.
    if (SUCCEEDED(hr)) {
        UINT32 length = 0;

        hr = familyNames->GetStringLength(index, &length);

        if (SUCCEEDED(hr)) {
            QVarLengthArray<wchar_t, 128> name(length+1);

            hr = familyNames->GetString(index, name.data(), name.size());

            if (SUCCEEDED(hr))
                fontDef.family = QString::fromWCharArray(name.constData());
        }
    }

    if (familyNames != NULL)
        familyNames->Release();
    if (fontFamily)
        fontFamily->Release();

    if (FAILED(hr))
        qErrnoWarning(hr, "initFontInfo: Failed to get family name");

    if (fontDef.pointSize < 0)
        fontDef.pointSize = fontDef.pixelSize * 72. / dpi;
    else if (fontDef.pixelSize == -1)
        fontDef.pixelSize = qRound(fontDef.pointSize * dpi / 72.);
}

static void initFontInfo(QFontEngineDirectWrite *fe, const QFontDef &request,
                         int dpi, IDWriteFont *font)
{
    fe->fontDef = request;

    IDWriteFontFamily *fontFamily = NULL;
    HRESULT hr = font->GetFontFamily(&fontFamily);

    IDWriteLocalizedStrings *familyNames = NULL;
    if (SUCCEEDED(hr))
        hr = fontFamily->GetFamilyNames(&familyNames);

    UINT32 index = 0;
    BOOL exists = false;

    wchar_t localeName[LOCALE_NAME_MAX_LENGTH];

    if (SUCCEEDED(hr)) {
        int defaultLocaleSuccess = GetUserDefaultLocaleName(localeName, LOCALE_NAME_MAX_LENGTH);

        if (defaultLocaleSuccess)
            hr = familyNames->FindLocaleName(localeName, &index, &exists);

        if (SUCCEEDED(hr) && !exists)
            hr = familyNames->FindLocaleName(L"en-us", &index, &exists);
    }

    if (!exists)
        index = 0;

    UINT32 length = 0;
    if (SUCCEEDED(hr))
        hr = familyNames->GetStringLength(index, &length);

    wchar_t *name = new (std::nothrow) wchar_t[length+1];
    if (name == NULL)
        hr = E_OUTOFMEMORY;

    // Get the family name.
    if (SUCCEEDED(hr))
        hr = familyNames->GetString(index, name, length + 1);

    if (SUCCEEDED(hr))
        fe->fontDef.family = QString::fromWCharArray(name);

    delete[] name;
    if (familyNames != NULL)
        familyNames->Release();

    if (FAILED(hr))
        qErrnoWarning(hr, "initFontInfo: Failed to get family name");

    if (fe->fontDef.pointSize < 0)
        fe->fontDef.pointSize = fe->fontDef.pixelSize * 72. / dpi;
    else if (fe->fontDef.pixelSize == -1)
        fe->fontDef.pixelSize = qRound(fe->fontDef.pointSize * dpi / 72.);
}

HRESULT GetFamilyNameFromDWriteFont(IDWriteFont* font, WCHAR* buffer, const UINT bufferSize)
{
	IDWriteFontFamily* dwriteFontFamily;
	HRESULT hr = font->GetFontFamily(&dwriteFontFamily);
	if (SUCCEEDED(hr))
	{
		hr = GetFamilyNameFromDWriteFontFamily(dwriteFontFamily, buffer, bufferSize);
		dwriteFontFamily->Release();
	}

	return hr;
}

void loadInitialFontDialogParams(struct fontDialogParams *params)
{
	struct fontCollection *fc;
	IDWriteFontFamily *family;
	IDWriteFont *font;
	HRESULT hr;

	// Our preferred font is Arial 10 Regular.
	// 10 comes from the official font dialog.
	// Arial Regular is a reasonable, if arbitrary, default; it's similar to the defaults on other systems.
	// If Arial isn't found, we'll use Helvetica and then MS Sans Serif as fallbacks, and if not, we'll just grab the first font family in the collection.

	// We need the correct localized name for Regular (and possibly Arial too? let's say yes to be safe), so let's grab the strings from DirectWrite instead of hardcoding them.
	fc = loadFontCollection();
	family = tryFindFamily(fc->fonts, L"Arial");
	if (family == NULL) {
		family = tryFindFamily(fc->fonts, L"Helvetica");
		if (family == NULL) {
			family = tryFindFamily(fc->fonts, L"MS Sans Serif");
			if (family == NULL) {
				hr = fc->fonts->GetFontFamily(0, &family);
				if (hr != S_OK)
					logHRESULT(L"error getting first font out of font collection (worst case scenario)", hr);
			}
		}
	}

	// next part is simple: just get the closest match to regular
	hr = family->GetFirstMatchingFont(
		DWRITE_FONT_WEIGHT_NORMAL,
		DWRITE_FONT_STRETCH_NORMAL,
		DWRITE_FONT_STYLE_NORMAL,
		&font);
	if (hr != S_OK)
		logHRESULT(L"error getting Regular font from Arial", hr);

	params->font = font;
	params->size = 10;
	params->familyName = fontCollectionFamilyName(fc, family);
	params->styleName = fontStyleName(fc, font);

	// don't release font; we still need it
	family->Release();
	fontCollectionFree(fc);
}

IDWriteFont* FindDWriteFontInFontCollectionByGDIFamilyName(
	IDWriteFontCollection* fontCollection, const WCHAR* gdiFamilyName)
{
	const UINT32 fontCollectionFamilyCount = fontCollection->GetFontFamilyCount();
	for (UINT32 i = 0; i < fontCollectionFamilyCount; ++i)
	{
		IDWriteFontFamily* fontFamily;
		HRESULT hr = fontCollection->GetFontFamily(i, &fontFamily);
		if (SUCCEEDED(hr))
		{
			IDWriteFont* font = FindDWriteFontInFontFamilyByGDIFamilyName(
				fontFamily, gdiFamilyName);
			fontFamily->Release();

			if (font)
			{
				return font;
			}
		}
	}

	return nullptr;
}

HRESULT GetFonts(IDWriteFontCollection* fontCollection, const WCHAR* fontFamilyName, IN OUT std::vector<IDWriteFont*>& fonts)
{
    HRESULT hr = S_OK;

    IDWriteFontFamily* fontFamily = NULL;
    IDWriteFont*       font       = NULL;

    hr = GetFontFamily(fontCollection, fontFamilyName, &fontFamily);

    if (SUCCEEDED(hr))
    {
        UINT32 fontCount = fontFamily->GetFontCount();

        // Read font variant in the family.
        try
        {
            for (UINT32 i = 0; i != fontCount; ++i)
            {
                hr = fontFamily->GetFont(i, &font);
                if (FAILED(hr))
                    break;

                fonts.push_back(font);
                SafeDetach(&font);
            }
        }
        catch (...)
        {
            hr = ExceptionToHResult();
        }
    }

    SafeRelease(&font);
    SafeRelease(&fontFamily);

    return hr;
}

HRESULT DWriteCreateResources(HDC hdc, wchar_t *text, HFONT hfont)
{
    HRESULT hr = S_OK;

    // If the DirectWrite factory doesn't exist, create the resources,
    // only create these resources once.
    if (!g_pDWriteFactory)
    {
        HWND hwnd;
        RECT r;

        // DirectWrite variables.
        IDWriteFontFamily* pFontFamily = NULL;
        IDWriteFont* pFont = NULL;
        IDWriteLocalizedStrings* pFamilyNames = NULL;
        
        // Logical (GDI) font.
        LOGFONT lf = {};

        UINT32 length = 0;
        UINT32 index = 0;
        float fontSize = 0;

        // length of the string
        UINT32 textLength = 0;

        wchar_t *name = NULL;

        // Get a handle to the DC and the window rect.
        hwnd = WindowFromDC(hdc);
        GetClientRect(hwnd, &r);

        // Calculate the string length.
        textLength = UINT32(wcslen(text));

        // Create the DirectWrite factory.
        hr = DWriteCreateFactory(
            DWRITE_FACTORY_TYPE_SHARED,
            __uuidof(IDWriteFactory),
            reinterpret_cast<IUnknown**>(&g_pDWriteFactory)
            );

        // Create a GDI interop interface.
        if (SUCCEEDED(hr))
        {
            hr = g_pDWriteFactory->GetGdiInterop(&g_pGdiInterop);
        }
        
        if (SUCCEEDED(hr))
        {
            // Get a logical font from the font handle.
            GetObject(hfont, sizeof(LOGFONT), &lf);
        }

        // Convert to a DirectWrite font.
        if (SUCCEEDED(hr))
        {
            hr = g_pGdiInterop->CreateFontFromLOGFONT(&lf, &pFont);
        }
        
        // Get the font family.
        if (SUCCEEDED(hr))
        {
            hr = pFont->GetFontFamily(&pFontFamily);
        }

        // Get a list of localized family names.
        if (SUCCEEDED(hr))
        {
            hr = pFontFamily->GetFamilyNames(&pFamilyNames);
        }

        // Select the first locale.  This is OK, because we are not displaying the family name.
        index = 0;
        
        // Get the length of the family name.
        if (SUCCEEDED(hr))
        {
            hr = pFamilyNames->GetStringLength(index, &length);
        }

        if (SUCCEEDED(hr))
        {
            // Allocate a new string.
            name = new (std::nothrow) wchar_t[length+1];
		    if (name == NULL)
            {
			    hr = E_OUTOFMEMORY;
            }
        }

        // Get the actual family name.
        if (SUCCEEDED(hr))
        {
            hr = pFamilyNames->GetString(index, name, length+1);
        }

        if (SUCCEEDED(hr))
        {
            // Calculate the font size.
//.........这里部分代码省略.........

    HRESULT
DWriteContext::SetLOGFONT(const LOGFONTW &logFont, float fontSize)
{
    // Most of this function is copy from: http://msdn.microsoft.com/en-us/library/windows/desktop/dd941783(v=vs.85).aspx
    HRESULT hr = S_OK;

    IDWriteFont *font = NULL;
    IDWriteFontFamily *fontFamily = NULL;
    IDWriteLocalizedStrings *localizedFamilyNames = NULL;

    if (SUCCEEDED(hr))
    {
	hr = mGdiInterop->CreateFontFromLOGFONT(&logFont, &font);
    }

    // Get the font family to which this font belongs.
    if (SUCCEEDED(hr))
    {
	hr = font->GetFontFamily(&fontFamily);
    }

    // Get the family names. This returns an object that encapsulates one or
    // more names with the same meaning but in different languages.
    if (SUCCEEDED(hr))
    {
	hr = fontFamily->GetFamilyNames(&localizedFamilyNames);
    }

    // Get the family name at index zero. If we were going to display the name
    // we'd want to try to find one that matched the use locale, but for
    // purposes of creating a text format object any language will do.

    wchar_t familyName[100];
    if (SUCCEEDED(hr))
    {
	hr = localizedFamilyNames->GetString(0, familyName,
		ARRAYSIZE(familyName));
    }

    if (SUCCEEDED(hr))
    {
	// If no font size was passed in use the lfHeight of the LOGFONT.
	if (fontSize == 0)
	{
	    // Convert from pixels to DIPs.
	    fontSize = PixelsToDipsY(logFont.lfHeight);
	    if (fontSize < 0)
	    {
		// Negative lfHeight represents the size of the em unit.
		fontSize = -fontSize;
	    }
	    else
	    {
		// Positive lfHeight represents the cell height (ascent +
		// descent).
		DWRITE_FONT_METRICS fontMetrics;
		font->GetMetrics(&fontMetrics);

		// Convert the cell height (ascent + descent) from design units
		// to ems.
		float cellHeight = static_cast<float>(
			fontMetrics.ascent + fontMetrics.descent)
					       / fontMetrics.designUnitsPerEm;

		// Divide the font size by the cell height to get the font em
		// size.
		fontSize /= cellHeight;
	    }
	}
    }

    // The text format includes a locale name. Ideally, this would be the
    // language of the text, which may or may not be the same as the primary
    // language of the user. However, for our purposes the user locale will do.
    wchar_t localeName[LOCALE_NAME_MAX_LENGTH];
    if (SUCCEEDED(hr))
    {
	if (GetUserDefaultLocaleName(localeName, LOCALE_NAME_MAX_LENGTH) == 0)
	    hr = HRESULT_FROM_WIN32(GetLastError());
    }

    if (SUCCEEDED(hr))
    {
	// Create the text format object.
	hr = mDWriteFactory->CreateTextFormat(
		familyName,
		NULL, // no custom font collection
		font->GetWeight(),
		font->GetStyle(),
		font->GetStretch(),
		fontSize,
		localeName,
		&mTextFormat);
    }

    if (SUCCEEDED(hr))
    {
	mFontWeight = static_cast<DWRITE_FONT_WEIGHT>(logFont.lfWeight);
	mFontStyle = logFont.lfItalic ? DWRITE_FONT_STYLE_ITALIC
	    : DWRITE_FONT_STYLE_NORMAL;
//.........这里部分代码省略.........

int main(void)
{
	int argc;
	LPWSTR *argv;
	WCHAR *fontname, *string;
	int len;
	HDC dc;
	HFONT font, prevfont;
	IDWriteFontCollection *sysfc;
	UINT32 index;
	BOOL exists;
	IDWriteFontFamily *dwfamily;
	IDWriteFont *dwfont;
	IDWriteFontFace *dwface;
	featurePreparer *features;
	HRESULT hr;

	// TODO would using wmain() be adequate?
	argv = CommandLineToArgvW(GetCommandLineW(), &argc);
	if (argv == NULL)
		dieLE("error getting command-line arguments");
	if (argc != 3) {
		fprintf(stderr, "usage: %ws font string\n", argv[0]);
		return 1;
	}
	fontname = argv[1];
	string = argv[2];
	len = wcslen(string);

	// DirectWrite requires COM
	hr = CoInitialize(NULL);
	if (hr != S_OK)
		die("error initializing COM", hr);
	// Uniscribe requires a device context with the font to use
	dc = GetDC(NULL);
	if (dc == NULL)
		dieLE("error getting screen HDC for Uniscribe");
	// TODO DEFAULT_CHARSET might affect the results we get
	font = CreateFontW(0, 0, 0, 0, 0, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, fontname);
	if (font == NULL)
		dieLE("error creating font for Uniscribe");
	prevfont = (HFONT) SelectObject(dc, font);
	if (prevfont == NULL)
		dieLE("error selecting font into HDC for Uniscribe");
	// and initialize DirectWrite
	hr = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED,
		__uuidof (IDWriteFactory),
		(IUnknown **) (&dwfactory));
	if (hr != S_OK)
		die("error initializing DirectWrite", hr);
	// and load the font *there*
	hr = dwfactory->GetSystemFontCollection(&sysfc, TRUE);
	if (hr != S_OK)
		die("error loading DirectWrite system font collection", hr);
	hr = sysfc->FindFamilyName(fontname, &index, &exists);
	if (hr != S_OK)
		die("error finding DirectWrite font family", hr);
	if (!exists)
		die("font not found in DirectWrite system font collection", E_FAIL);
	hr = sysfc->GetFontFamily(index, &dwfamily);
	if (hr != S_OK)
		die("error loading DirectWrite font family", hr);
	hr = dwfamily->GetFirstMatchingFont(DWRITE_FONT_WEIGHT_NORMAL,
		DWRITE_FONT_STRETCH_NORMAL,
		DWRITE_FONT_STYLE_NORMAL,
		&dwfont);
	if (hr != S_OK)
		die("error loading DirectWrite font object", hr);
	hr = dwfont->CreateFontFace(&dwface);
	if (hr != S_OK)
		die("error creating DirectWrite font face", hr);

	// first, uniscribe only; no features are used
//	uniscribeTest(dc, string, len, NULL,
//		doScriptItemize, doScriptShape, "Uniscribe");

	// next, unprepared features (NULL values)
	features = new featurePreparer;
//features->add('z','e','r','o',1);
//features->add('f','r','a','c',1);features->prepare(len);
//	uniscribeTest(dc, string, len, features,
//		doScriptItemizeOpenType, doScriptShapeOpenType, "Uniscribe OpenType");
	directwriteAnalyzerTest(dwface, string, len, features);
	delete features;

	dwface->Release();
	dwfont->Release();
	dwfamily->Release();
	sysfc->Release();
	dwfactory->Release();
	SelectObject(dc, prevfont);
	DeleteObject(font);
	ReleaseDC(NULL, dc);
	CoUninitialize();
	return 0;
}

void QWinRTFontDatabase::populateFamily(const QString &familyName)
{
    IDWriteFontFamily *fontFamily = m_fontFamilies.value(familyName);
    if (!fontFamily) {
        qWarning("The font family %s was not found.", qPrintable(familyName));
        return;
    }

    bool fontRegistered = false;
    const int fontCount = fontFamily->GetFontCount();
    for (int j = 0; j < fontCount; ++j) {
        ComPtr<IDWriteFont> font;
        HRESULT hr = fontFamily->GetFont(j, &font);
        if (FAILED(hr)) {
            qWarning("Unable to get font: %s", qPrintable(qt_error_string(hr)));
            continue;
        }

        // Skip simulated faces
        if (font->GetSimulations() != DWRITE_FONT_SIMULATIONS_NONE)
            continue;

        ComPtr<IDWriteFontFace> baseFontFace;
        hr = font->CreateFontFace(&baseFontFace);
        if (FAILED(hr)) {
            qWarning("Unable to create base font face: %s", qPrintable(qt_error_string(hr)));
            continue;
        }
        ComPtr<IDWriteFontFace1> fontFace;
        hr = baseFontFace.As(&fontFace);
        if (FAILED(hr)) {
            qWarning("Unable to create font face: %s", qPrintable(qt_error_string(hr)));
            continue;
        }

        // We can't deal with multi-file fonts
        quint32 fileCount;
        hr = fontFace->GetFiles(&fileCount, NULL);
        if (FAILED(hr)) {
            qWarning("Unable to get font file count: %s", qPrintable(qt_error_string(hr)));
            continue;
        }
        if (fileCount != 1)
            continue;

        ComPtr<IDWriteLocalizedStrings> informationalStrings;
        BOOL exists;
        hr = font->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_MANUFACTURER,
                                           &informationalStrings, &exists);
        if (FAILED(hr)) {
            qWarning("Unable to get font foundry: %s", qPrintable(qt_error_string(hr)));
            continue;
        }
        QString foundryName;
        if (exists) {
            quint32 length;
            hr = informationalStrings->GetStringLength(0, &length);
            if (FAILED(hr))
                qWarning("Unable to get foundry name length: %s", qPrintable(qt_error_string(hr)));
            if (SUCCEEDED(hr)) {
                QVector<wchar_t> buffer(length + 1);
                hr = informationalStrings->GetString(0, buffer.data(), buffer.size());
                if (FAILED(hr))
                    qWarning("Unable to get foundry name: %s", qPrintable(qt_error_string(hr)));
                if (SUCCEEDED(hr))
                    foundryName = QString::fromWCharArray(buffer.data(), length);
            }
        }

        QFont::Weight weight;
        switch (font->GetWeight()) {
        case DWRITE_FONT_WEIGHT_THIN:
        case DWRITE_FONT_WEIGHT_EXTRA_LIGHT:
        case DWRITE_FONT_WEIGHT_LIGHT:
        case DWRITE_FONT_WEIGHT_SEMI_LIGHT:
            weight = QFont::Light;
            break;
        default:
        case DWRITE_FONT_WEIGHT_NORMAL:
        case DWRITE_FONT_WEIGHT_MEDIUM:
            weight = QFont::Normal;
            break;
        case DWRITE_FONT_WEIGHT_DEMI_BOLD:
            weight = QFont::DemiBold;
            break;
        case DWRITE_FONT_WEIGHT_BOLD:
        case DWRITE_FONT_WEIGHT_EXTRA_BOLD:
            weight = QFont::Bold;
            break;
        case DWRITE_FONT_WEIGHT_BLACK:
        case DWRITE_FONT_WEIGHT_EXTRA_BLACK:
            weight = QFont::Black;
            break;
        }

        QFont::Style style;
        switch (font->GetStyle()) {
        default:
        case DWRITE_FONT_STYLE_NORMAL:
            style = QFont::StyleNormal;
//.........这里部分代码省略.........