C++ SkTypeface::ref方法代码示例

SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
                                       const char familyName[],
                                       SkTypeface::Style style) {
    load_system_fonts();

    SkAutoMutexAcquire  ac(gFamilyMutex);
    
    // clip to legal style bits
    style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);
    
    SkTypeface* tf = NULL;

    if (NULL != familyFace) {
        tf = find_typeface(familyFace, style);
    } else if (NULL != familyName) {
//        SkDebugf("======= familyName <%s>\n", familyName);
        tf = find_typeface(familyName, style);
    }

    if (NULL == tf) {
        tf = find_best_face(gDefaultFamily, style);
    }

    // we ref(), since the symantic is to return a new instance
    tf->ref();
    return tf;
}

SkTypeface* SkCreateTypefaceForScript(FallbackScripts script) {
    if (!SkTypeface_ValidScript(script)) {
        return NULL;
    }

    // ensure that our table is populated
    initFBScriptInfo();

    FBScriptInfo& scriptInfo = gFBScriptInfo[script];

    // ensure the element with that index actually maps to the correct script
    SkASSERT(scriptInfo.fScript == script);

    // if a suitable script could not be found then return NULL
    if (scriptInfo.fFontID == 0) {
        return NULL;
    }

    SkAutoMutexAcquire  ac(gFamilyHeadAndNameListMutex);

    // retrieve the typeface the corresponds to this fontID
    SkTypeface* tf = find_from_uniqueID(scriptInfo.fFontID);
    // we ref(), since the semantic is to return a new instance
    tf->ref();
    return tf;
}

SkTypeface* SkTypefaceFromPdfStandardFont(const char* fontName, bool bold, bool italic) {
    SkTDict<SkPdfStandardFontEntry>& standardFontMap = getStandardFonts();

    SkTypeface* typeface = NULL;
    SkPdfStandardFontEntry fontData;

    if (standardFontMap.find(fontName, &fontData)) {
        // TODO(edisonn): How does the bold/italic specified in standard definition combines with
        // the one in /font key? use OR for now.
        bold = bold || fontData.fIsBold;
        italic = italic || fontData.fIsItalic;

        typeface = SkTypeface::CreateFromName(
            fontData.fName,
            SkTypeface::Style((bold ? SkTypeface::kBold : 0) |
                              (italic ? SkTypeface::kItalic : 0)));
    } else {
        typeface = SkTypeface::CreateFromName(
            fontName,
            SkTypeface::kNormal);
    }

    if (typeface) {
        typeface->ref();
    }
    return typeface;
}

/**
 *  This guy is public. It first searches the cache, and if a match is not found,
 *  it creates a new face.
 */
SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT& origLF) {
    LOGFONT lf = origLF;
    make_canonical(&lf);
    SkTypeface* face = SkTypefaceCache::FindByProc(FindByLogFont, &lf);
    if (face) {
        face->ref();
    } else {
        face = LogFontTypeface::Create(lf);
        SkTypefaceCache::Add(face, get_style(lf));
    }
    return face;
}

SkTypeface* SkCreateTypefaceFromCairoFont(cairo_font_face_t* fontFace, const SkFontStyle& style, bool isFixedWidth)
{
    SkTypeface* typeface = reinterpret_cast<SkTypeface*>(cairo_font_face_get_user_data(fontFace, &kSkTypefaceKey));

    if (typeface) {
        typeface->ref();
    } else {
        typeface = SkCairoFTTypeface::CreateTypeface(fontFace, style, isFixedWidth);
        SkTypefaceCache::Add(typeface, style);
    }

    return typeface;
}

SkTypeface* SkCreateFallbackTypefaceForChar(SkUnichar uni,
                                            SkTypeface::Style style) {
    {
        SkAutoMutexAcquire  ac(gFamilyHeadAndNameListMutex);
        load_system_fonts();
    }

    SkTypeface* tf = findFallbackTypefaceForChar(uni);
    if (!tf) {
        return NULL;
    }
    SkAutoMutexAcquire  ac(gFamilyHeadAndNameListMutex);
    tf = find_typeface(tf, style);
    // we ref(), since the semantic is to return a new instance
    tf->ref();
    return tf;
}

SkTypeface* SkCreateTypefaceFromCairoFTFontWithFontconfig(cairo_scaled_font_t* scaledFont, FcPattern* pattern)
{
    cairo_font_face_t* fontFace = cairo_scaled_font_get_font_face(scaledFont);
    SkASSERT(cairo_font_face_status(fontFace) == CAIRO_STATUS_SUCCESS);

    SkTypeface* typeface = reinterpret_cast<SkTypeface*>(cairo_font_face_get_user_data(fontFace, &kSkTypefaceKey));
    if (typeface) {
        typeface->ref();
    } else {
        CairoLockedFTFace faceLock(scaledFont);
        if (FT_Face face = faceLock.getFace()) {
            typeface = SkCairoFTTypeface::CreateTypeface(fontFace, face, pattern);
            SkTypefaceCache::Add(typeface, typeface->fontStyle());
        }
    }

    return typeface;
}

SkPdfFont* SkPdfFont::fontFromFontDescriptor(SkPdfNativeDoc* doc, SkPdfFontDescriptorDictionary* fd,
                                             bool loadFromName) {
    // TODO(edisonn): partial implementation.
    // Only one, at most be available
    SkPdfStream* pdfStream = NULL;
    if (fd->has_FontFile()) {
        pdfStream = fd->FontFile(doc);
    } else if (fd->has_FontFile2()) {
        pdfStream = fd->FontFile2(doc);
    } if (fd->has_FontFile3()) {
        pdfStream = fd->FontFile3(doc);
    } else {
        if (loadFromName) {
            return fontFromName(doc, fd, fd->FontName(doc).c_str());
        }
    }

    const unsigned char* uncompressedStream = NULL;
    size_t uncompressedStreamLength = 0;

    // TODO(edisonn): report warning to be used in testing.
    if (!pdfStream ||
            !pdfStream->GetFilteredStreamRef(&uncompressedStream, &uncompressedStreamLength) ||
            !uncompressedStream ||
            !uncompressedStreamLength) {
        return NULL;
    }

    SkMemoryStream* skStream = new SkMemoryStream(uncompressedStream, uncompressedStreamLength);
    SkTypeface* face = SkTypeface::CreateFromStream(skStream);

    if (face == NULL) {
        // TODO(edisonn): report warning to be used in testing.
        return NULL;
    }

    face->ref();

    return new SkPdfStandardFont(face);
}

SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
                                       const char familyName[],
                                       const void* data, size_t bytelength,
                                       SkTypeface::Style style) {

    static SkTypeface* gDefaultTypeface;
    SkAutoMutexAcquire  ac(gFTMutex);

#ifndef CAN_USE_LOGFONT_NAME
    familyName = NULL;
    familyFace = NULL;
#endif

    // clip to legal style bits
    style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);

    SkTypeface* tf = NULL;
    if (NULL == familyFace && NULL == familyName) {
        LOGFONT lf = get_default_font();
        lf.lfWeight = (style & SkTypeface::kBold) != 0 ? FW_BOLD : FW_NORMAL ;
        lf.lfItalic = ((style & SkTypeface::kItalic) != 0);
        // hack until we figure out if SkTypeface should cache this itself
        if (style == SkTypeface::kNormal) {
            if (NULL == gDefaultTypeface) {
                gDefaultTypeface = SkCreateTypefaceFromLOGFONT(lf);
            }
            tf = gDefaultTypeface;
            tf->ref();
        } else {
            tf = SkCreateTypefaceFromLOGFONT(lf);
        }
    } else {
#ifdef CAN_USE_LOGFONT_NAME
        LOGFONT lf;
        if (NULL != familyFace) {
            uint32_t id = familyFace->uniqueID();
            LogFontTypeface* rec = LogFontTypeface::FindById(id);
            if (!rec) {
                SkASSERT(false);
                lf = get_default_font();
            }
            else {
                lf = rec->logFont();
            }
        }
        else {
            memset(&lf, 0, sizeof(LOGFONT));

            lf.lfHeight = -11; // default
            lf.lfQuality = PROOF_QUALITY;
            lf.lfCharSet = DEFAULT_CHARSET;

#ifdef UNICODE
            // Get the buffer size needed first.
            size_t str_len = ::MultiByteToWideChar(CP_UTF8, 0, familyName,
                                                   -1, NULL, 0);
            // Allocate a buffer (str_len already has terminating null
            // accounted for).
            wchar_t *wideFamilyName = new wchar_t[str_len];
            // Now actually convert the string.
            ::MultiByteToWideChar(CP_UTF8, 0, familyName, -1,
                                  wideFamilyName, str_len);
            ::wcsncpy(lf.lfFaceName, wideFamilyName, LF_FACESIZE);
            delete [] wideFamilyName;
#else
            ::strncpy(lf.lfFaceName, familyName, LF_FACESIZE);
#endif
            lf.lfFaceName[LF_FACESIZE-1] = '\0';
        }

        // use the style desired
        lf.lfWeight = (style & SkTypeface::kBold) != 0 ? FW_BOLD : FW_NORMAL ;
        lf.lfItalic = ((style & SkTypeface::kItalic) != 0);
        tf = SkCreateTypefaceFromLOGFONT(lf);
#endif
    }

    if (NULL == tf) {
        tf = SkCreateTypefaceFromLOGFONT(get_default_font());
    }
    return tf;
}