1 /* 2 * Copyright (C) 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server.graphics.fonts; 18 19 import android.graphics.Bitmap; 20 import android.graphics.Canvas; 21 import android.graphics.Typeface; 22 import android.graphics.fonts.Font; 23 import android.graphics.fonts.FontFamily; 24 import android.graphics.fonts.FontFileUtil; 25 import android.text.Layout; 26 import android.text.StaticLayout; 27 import android.text.TextPaint; 28 import android.text.TextUtils; 29 30 import java.io.File; 31 import java.io.FileInputStream; 32 import java.io.IOException; 33 import java.nio.ByteBuffer; 34 import java.nio.DirectByteBuffer; 35 import java.nio.NioUtils; 36 import java.nio.channels.FileChannel; 37 38 /* package */ class OtfFontFileParser implements UpdatableFontDir.FontFileParser { 39 @Override getPostScriptName(File file)40 public String getPostScriptName(File file) throws IOException { 41 ByteBuffer buffer = mmap(file); 42 try { 43 return FontFileUtil.getPostScriptName(buffer, 0); 44 } finally { 45 unmap(buffer); 46 } 47 } 48 49 @Override buildFontFileName(File file)50 public String buildFontFileName(File file) throws IOException { 51 ByteBuffer buffer = mmap(file); 52 try { 53 String psName = FontFileUtil.getPostScriptName(buffer, 0); 54 int isType1Font = FontFileUtil.isPostScriptType1Font(buffer, 0); 55 int isCollection = FontFileUtil.isCollectionFont(buffer); 56 57 if (TextUtils.isEmpty(psName) || isType1Font == -1 || isCollection == -1) { 58 return null; 59 } 60 61 String extension; 62 if (isCollection == 1) { 63 extension = isType1Font == 1 ? ".otc" : ".ttc"; 64 } else { 65 extension = isType1Font == 1 ? ".otf" : ".ttf"; 66 } 67 return psName + extension; 68 } finally { 69 unmap(buffer); 70 } 71 72 } 73 74 @Override getRevision(File file)75 public long getRevision(File file) throws IOException { 76 ByteBuffer buffer = mmap(file); 77 try { 78 return FontFileUtil.getRevision(buffer, 0); 79 } finally { 80 unmap(buffer); 81 } 82 } 83 84 @Override tryToCreateTypeface(File file)85 public void tryToCreateTypeface(File file) throws Throwable { 86 ByteBuffer buffer = mmap(file); 87 try { 88 Font font = new Font.Builder(buffer).build(); 89 FontFamily family = new FontFamily.Builder(font).build(); 90 Typeface typeface = new Typeface.CustomFallbackBuilder(family).build(); 91 92 TextPaint p = new TextPaint(); 93 p.setTextSize(24f); 94 p.setTypeface(typeface); 95 96 // Test string to try with the passed font. 97 // TODO: Good to extract from font file. 98 String testTextToDraw = "abcXYZ@- " 99 + "\uD83E\uDED6" // Emoji E13.0 100 + "\uD83C\uDDFA\uD83C\uDDF8" // Emoji Flags 101 + "\uD83D\uDC8F\uD83C\uDFFB" // Emoji Skin tone Sequence 102 // ZWJ Sequence 103 + "\uD83D\uDC68\uD83C\uDFFC\u200D\u2764\uFE0F\u200D\uD83D\uDC8B\u200D" 104 + "\uD83D\uDC68\uD83C\uDFFF"; 105 106 int width = (int) Math.ceil(Layout.getDesiredWidth(testTextToDraw, p)); 107 StaticLayout layout = StaticLayout.Builder.obtain( 108 testTextToDraw, 0, testTextToDraw.length(), p, width).build(); 109 Bitmap bmp = Bitmap.createBitmap( 110 layout.getWidth(), layout.getHeight(), Bitmap.Config.ALPHA_8); 111 Canvas canvas = new Canvas(bmp); 112 layout.draw(canvas); 113 } finally { 114 unmap(buffer); 115 } 116 } 117 mmap(File file)118 private static ByteBuffer mmap(File file) throws IOException { 119 try (FileInputStream in = new FileInputStream(file)) { 120 FileChannel fileChannel = in.getChannel(); 121 return fileChannel.map(FileChannel.MapMode.READ_ONLY, 0, fileChannel.size()); 122 } 123 } 124 unmap(ByteBuffer buffer)125 private static void unmap(ByteBuffer buffer) { 126 if (buffer instanceof DirectByteBuffer) { 127 NioUtils.freeDirectBuffer(buffer); 128 } 129 } 130 } 131