https://source.android.com/ 
/*
 * Copyright (C) 2008-2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.renderscript;

import java.io.File;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import android.os.Environment;

import android.content.res.AssetManager;
import android.content.res.Resources;


@hide
Deprecated:in API 16

This class gives users a simple way to draw hardware accelerated text.
Internally, the glyphs are rendered using the Freetype library and an internal cache of
rendered glyph bitmaps is maintained. Each font object represents a combination of a typeface,
and point size. You can create multiple font objects to represent styles such as bold or italic text,
faces, and different font sizes. During creation, the Android system quieries device's screen DPI to
ensure proper sizing across multiple device configurations.


Fonts are rendered using screen-space positions and no state setup beyond binding a
font to the RenderScript is required. A note of caution on performance, though the state changes
are transparent to the user, they do happen internally, and it is more efficient to
render large batches of text in sequence. It is also more efficient to render multiple
characters at once instead of one by one to improve draw call batching.


Font color and transparency are not part of the font object and you can freely modify
them in the script to suit the user's rendering needs. Font colors work as a state machine.
Every new call to draw text uses the last color set in the script.
/**
 * @hide
 * @deprecated in API 16
 * <p>This class gives users a simple way to draw hardware accelerated text.
 * Internally, the glyphs are rendered using the Freetype library and an internal cache of
 * rendered glyph bitmaps is maintained. Each font object represents a combination of a typeface,
 * and point size. You can create multiple font objects to represent styles such as bold or italic text,
 * faces, and different font sizes. During creation, the Android system quieries device's screen DPI to
 * ensure proper sizing across multiple device configurations.</p>
 * <p>Fonts are rendered using screen-space positions and no state setup beyond binding a
 * font to the RenderScript is required. A note of caution on performance, though the state changes
 * are transparent to the user, they do happen internally, and it is more efficient to
 * render large batches of text in sequence. It is also more efficient to render multiple
 * characters at once instead of one by one to improve draw call batching.</p>
 * <p>Font color and transparency are not part of the font object and you can freely modify
 * them in the script to suit the user's rendering needs. Font colors work as a state machine.
 * Every new call to draw text uses the last color set in the script.</p>
 **/
public class Font extends BaseObj {

    //These help us create a font by family name
    private static final String[] sSansNames = {
        "sans-serif", "arial", "helvetica", "tahoma", "verdana"
    };

    private static final String[] sSerifNames = {
        "serif", "times", "times new roman", "palatino", "georgia", "baskerville",
        "goudy", "fantasy", "cursive", "ITC Stone Serif"
    };

    private static final String[] sMonoNames = {
        "monospace", "courier", "courier new", "monaco"
    };

    private static class FontFamily {
        String[] mNames;
        String mNormalFileName;
        String mBoldFileName;
        String mItalicFileName;
        String mBoldItalicFileName;
    }

    private static Map<String, FontFamily> sFontFamilyMap;

    
Deprecated:in API 16
/**
     * @deprecated in API 16
     */
    public enum Style {
        
Deprecated:in API 16
/**
         * @deprecated in API 16
         */
        NORMAL,
        
Deprecated:in API 16
/**
         * @deprecated in API 16
         */
        BOLD,
        
Deprecated:in API 16
/**
         * @deprecated in API 16
         */
        ITALIC,
        
Deprecated:in API 16
/**
         * @deprecated in API 16
         */
        BOLD_ITALIC;
    }

    private static void addFamilyToMap(FontFamily family) {
        for(int i = 0; i < family.mNames.length; i ++) {
            sFontFamilyMap.put(family.mNames[i], family);
        }
    }

    private static void initFontFamilyMap() {
        sFontFamilyMap = new HashMap<String, FontFamily>();

        FontFamily sansFamily = new FontFamily();
        sansFamily.mNames = sSansNames;
        sansFamily.mNormalFileName = "Roboto-Regular.ttf";
        sansFamily.mBoldFileName = "Roboto-Bold.ttf";
        sansFamily.mItalicFileName = "Roboto-Italic.ttf";
        sansFamily.mBoldItalicFileName = "Roboto-BoldItalic.ttf";
        addFamilyToMap(sansFamily);

        FontFamily serifFamily = new FontFamily();
        serifFamily.mNames = sSerifNames;
        serifFamily.mNormalFileName = "NotoSerif-Regular.ttf";
        serifFamily.mBoldFileName = "NotoSerif-Bold.ttf";
        serifFamily.mItalicFileName = "NotoSerif-Italic.ttf";
        serifFamily.mBoldItalicFileName = "NotoSerif-BoldItalic.ttf";
        addFamilyToMap(serifFamily);

        FontFamily monoFamily = new FontFamily();
        monoFamily.mNames = sMonoNames;
        monoFamily.mNormalFileName = "DroidSansMono.ttf";
        monoFamily.mBoldFileName = "DroidSansMono.ttf";
        monoFamily.mItalicFileName = "DroidSansMono.ttf";
        monoFamily.mBoldItalicFileName = "DroidSansMono.ttf";
        addFamilyToMap(monoFamily);
    }

    static {
        initFontFamilyMap();
    }

    static String getFontFileName(String familyName, Style style) {
        FontFamily family = sFontFamilyMap.get(familyName);
        if(family != null) {
            switch(style) {
                case NORMAL:
                    return family.mNormalFileName;
                case BOLD:
                    return family.mBoldFileName;
                case ITALIC:
                    return family.mItalicFileName;
                case BOLD_ITALIC:
                    return family.mBoldItalicFileName;
            }
        }
        // Fallback if we could not find the desired family
        return "DroidSans.ttf";
    }

    Font(long id, RenderScript rs) {
        super(id, rs);
        guard.open("destroy");
    }

    
Deprecated:in API 16
Takes a specific file name as an argument
/**
     * @deprecated in API 16
     * Takes a specific file name as an argument
     */
    static public Font createFromFile(RenderScript rs, Resources res, String path, float pointSize) {
        rs.validate();
        int dpi = res.getDisplayMetrics().densityDpi;
        long fontId = rs.nFontCreateFromFile(path, pointSize, dpi);

        if(fontId == 0) {
            throw new RSRuntimeException("Unable to create font from file " + path);
        }
        Font rsFont = new Font(fontId, rs);

        return rsFont;
    }

    
Deprecated:in API 16
/**
     * @deprecated in API 16
     */
    static public Font createFromFile(RenderScript rs, Resources res, File path, float pointSize) {
        return createFromFile(rs, res, path.getAbsolutePath(), pointSize);
    }

    
Deprecated:in API 16
/**
     * @deprecated in API 16
     */
    static public Font createFromAsset(RenderScript rs, Resources res, String path, float pointSize) {
        rs.validate();
        AssetManager mgr = res.getAssets();
        int dpi = res.getDisplayMetrics().densityDpi;

        long fontId = rs.nFontCreateFromAsset(mgr, path, pointSize, dpi);
        if(fontId == 0) {
            throw new RSRuntimeException("Unable to create font from asset " + path);
        }
        Font rsFont = new Font(fontId, rs);
        return rsFont;
    }

    
Deprecated:in API 16
/**
     * @deprecated in API 16
     */
    static public Font createFromResource(RenderScript rs, Resources res, int id, float pointSize) {
        String name = "R." + Integer.toString(id);

        rs.validate();
        InputStream is = null;
        try {
            is = res.openRawResource(id);
        } catch (Exception e) {
            throw new RSRuntimeException("Unable to open resource " + id);
        }

        int dpi = res.getDisplayMetrics().densityDpi;

        long fontId = 0;
        if (is instanceof AssetManager.AssetInputStream) {
            long asset = ((AssetManager.AssetInputStream) is).getNativeAsset();
            fontId = rs.nFontCreateFromAssetStream(name, pointSize, dpi, asset);
        } else {
            throw new RSRuntimeException("Unsupported asset stream created");
        }

        if(fontId == 0) {
            throw new RSRuntimeException("Unable to create font from resource " + id);
        }
        Font rsFont = new Font(fontId, rs);
        return rsFont;
    }

    
Deprecated:in API 16
Accepts one of the following family names as an argument
and will attempt to produce the best match with a system font:
"sans-serif" "arial" "helvetica" "tahoma" "verdana"
"serif" "times" "times new roman" "palatino" "georgia" "baskerville"
"goudy" "fantasy" "cursive" "ITC Stone Serif"
"monospace" "courier" "courier new" "monaco"
Returns default font if no match could be found.
/**
     * @deprecated in API 16
     * Accepts one of the following family names as an argument
     * and will attempt to produce the best match with a system font:
     *
     * "sans-serif" "arial" "helvetica" "tahoma" "verdana"
     * "serif" "times" "times new roman" "palatino" "georgia" "baskerville"
     * "goudy" "fantasy" "cursive" "ITC Stone Serif"
     * "monospace" "courier" "courier new" "monaco"
     *
     * Returns default font if no match could be found.
     */
    static public Font create(RenderScript rs, Resources res, String familyName, Style fontStyle, float pointSize) {
        String fileName = getFontFileName(familyName, fontStyle);
        String fontPath = Environment.getRootDirectory().getAbsolutePath();
        fontPath += "/fonts/" + fileName;
        return createFromFile(rs, res, fontPath, pointSize);
    }

}