[Feature Request / RFC] 配合 FontManagerService 将字体文件安装到 data 分区 about notocjk HOT 12 CLOSED

/**
* Parses XML representing {@link android.graphics.fonts.FontFamilyUpdateRequest}.
*
* <p>The format is like:
* <pre>{@code
*   <fontFamilyUpdateRequest>
*       <family name="family-name">
*           <font name="postScriptName"/>
*       </family>
*   </fontFamilyUpdateRequest>
* }</pre>
*/

/**
* Read a {@link Family} instance from <family> element in XML
*
* For the XML format, see {@link Font} class comment.
*
* @param parser an XML parser that points <family> element.
* @return an {@link Family} instance
*/

/**
* Font object used for update.
*
* Here is an example of Family/Font XML.
* <family name="my-sans">
*   <font name="MySans" weight="400" slant="0" axis="'wght' 400 'ital' 0" index="0" />
*   <font name="MySans" weight="400" slant="0" axis="'wght' 400 'ital' 1" index="0" />
*   <font name="MySans" weight="400" slant="0" axis="'wght' 700 'ital' 0" index="0" />
*   <font name="MySans" weight="400" slant="0" axis="'wght' 700 'ital' 1" index="0" />
* </family>
*
* @see Font#readFromXml(XmlPullParser)
* @see Font#writeToXml(TypedXmlSerializer, Font)
* @see Family#readFromXml(XmlPullParser)
* @see Family#writeFamilyToXml(TypedXmlSerializer, Family)
*/

fontFileName = mParser.buildFontFileName(tempNewFontFile);

UpdatableFontDir(File filesDir, FontFileParser parser, FsverityUtil fsverityUtil,
        File configFile) {
    this(filesDir, parser, fsverityUtil, configFile,
            System::currentTimeMillis,
            (map) -> SystemFonts.getSystemFontConfig(map, 0, 0)
    );
}

// For unit testing
UpdatableFontDir(File filesDir, FontFileParser parser, FsverityUtil fsverityUtil,
        File configFile, Supplier<Long> currentTimeSupplier,
        Function<Map<String, File>, FontConfig> configSupplier) {
    mFilesDir = filesDir;
    mParser = parser;
    mFsverityUtil = fsverityUtil;
    mConfigFile = new AtomicFile(configFile);
    mCurrentTimeSupplier = currentTimeSupplier;
    mConfigSupplier = configSupplier;
}

@Nullable
private UpdatableFontDir createUpdatableFontDir() {
    // Never read updatable font files in safe mode.
    if (mIsSafeMode) return null;
    // If apk verity is supported, fs-verity should be available.
    if (!VerityUtils.isFsVeritySupported()) return null;

    String[] certs = mContext.getResources().getStringArray(
            R.array.config_fontManagerServiceCerts);

    if (mDebugCertFilePath != null && (Build.IS_USERDEBUG || Build.IS_ENG)) {
        String[] tmp = new String[certs.length + 1];
        System.arraycopy(certs, 0, tmp, 0, certs.length);
        tmp[certs.length] = mDebugCertFilePath;
        certs = tmp;
    }

    return new UpdatableFontDir(new File(FONT_FILES_DIR), new OtfFontFileParser(),
            new FsverityUtilImpl(certs), new File(CONFIG_XML_FILE));
}

// ...

private void initialize() {
    synchronized (mUpdatableFontDirLock) {
        mUpdatableFontDir = createUpdatableFontDir();
        if (mUpdatableFontDir == null) {
            setSerializedFontMap(serializeSystemServerFontMap());
            return;
        }
        mUpdatableFontDir.loadFontFileMap();
        updateSerializedFontMap();
    }
}

@Override
public String getPostScriptName(File file) throws IOException {
    ByteBuffer buffer = mmap(file);
    try {
        return FontFileUtil.getPostScriptName(buffer, 0);
    } finally {
        unmap(buffer);
    }
}

/**
* Analyze name OpenType table and return PostScript name.
*
* IllegalArgumentException will be thrown for invalid font data.
* null will be returned if not found or the PostScript name is invalid.
*
* @param buffer a buffer of OpenType font
* @param index a font index
* @return a post script name or null if it is invalid or not found.
*/

// We should keep the first font family (config.getFontFamilies().get(0)) because it's used
// as a fallback font. See SystemFonts.java.