1 /* 2 * Copyright (C) 2018 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 android.graphics.text; 18 19 import android.annotation.NonNull; 20 21 import java.util.ArrayList; 22 import java.util.Collections; 23 import java.util.List; 24 25 // Based on the native implementation of LineBreaker in 26 // frameworks/base/core/jni/android_text_StaticLayout.cpp revision b808260 27 public abstract class BaseLineBreaker { 28 29 protected static final int TAB_MASK = 0x20000000; // keep in sync with StaticLayout 30 31 protected final @NonNull List<Primitive> mPrimitives; 32 protected final @NonNull 33 LineWidth mLineWidth; 34 protected final @NonNull 35 TabStops mTabStops; 36 BaseLineBreaker(@onNull List<Primitive> primitives, @NonNull LineWidth lineWidth, @NonNull TabStops tabStops)37 public BaseLineBreaker(@NonNull List<Primitive> primitives, @NonNull LineWidth lineWidth, 38 @NonNull TabStops tabStops) { 39 mPrimitives = Collections.unmodifiableList(primitives); 40 mLineWidth = lineWidth; 41 mTabStops = tabStops; 42 } 43 computeBreaks()44 public abstract Result computeBreaks(); 45 46 public static class Result { 47 List<Integer> mLineBreakOffset = new ArrayList<>(); 48 List<Float> mLineWidths = new ArrayList<>(); 49 List<Float> mLineAscents = new ArrayList<>(); 50 List<Float> mLineDescents = new ArrayList<>(); 51 List<Integer> mLineFlags = new ArrayList<>(); 52 } 53 } 54