TextLine.java revision 8a5137a5aeba39cbc2c57c83ef79241b446d0cb7
1e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt/* 2e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Copyright (C) 2010 The Android Open Source Project 3e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 4e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Licensed under the Apache License, Version 2.0 (the "License"); 5e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * you may not use this file except in compliance with the License. 6e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * You may obtain a copy of the License at 7e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 8e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * http://www.apache.org/licenses/LICENSE-2.0 9e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 10e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Unless required by applicable law or agreed to in writing, software 11e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * distributed under the License is distributed on an "AS IS" BASIS, 12e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * See the License for the specific language governing permissions and 14e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * limitations under the License. 15e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 16e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 17e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltpackage android.text; 18e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 19e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Bitmap; 20e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Canvas; 21e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Paint; 22e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Paint.FontMetricsInt; 23cc3ec6cdb2b892eb29513e72d8b205acbe997b25Gilles Debunneimport android.graphics.RectF; 24e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.Layout.Directions; 25c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Feltimport android.text.Layout.TabStops; 26e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.style.CharacterStyle; 27e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.style.MetricAffectingSpan; 28e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.style.ReplacementSpan; 29e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.util.Log; 30e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 31dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunneimport com.android.internal.util.ArrayUtils; 32dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne 33e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt/** 34e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Represents a line of styled text, for measuring in visual order and 35e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * for rendering. 36e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 37e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * <p>Get a new instance using obtain(), and when finished with it, return it 38e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * to the pool using recycle(). 39e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 40e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * <p>Call set to prepare the instance for use, then either draw, measure, 41e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * metrics, or caretToLeftRightOf. 42e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 43e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @hide 44e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 45e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltclass TextLine { 46bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy private static final boolean DEBUG = false; 47bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy 48e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private TextPaint mPaint; 49e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private CharSequence mText; 50e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private int mStart; 51e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private int mLen; 52e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private int mDir; 53e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private Directions mDirections; 54e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private boolean mHasTabs; 55c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt private TabStops mTabs; 56e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private char[] mChars; 57e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private boolean mCharsValid; 58e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private Spanned mSpanned; 59345cb03315a0813ec57e44f97fc3fa4af6b3c309Gilles Debunne private final TextPaint mWorkPaint = new TextPaint(); 60e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 61bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy private static final TextLine[] sCached = new TextLine[3]; 62e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 63e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 64e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns a new TextLine from the shared pool. 65e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 66e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return an uninitialized TextLine 67e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 68e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt static TextLine obtain() { 69e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextLine tl; 70bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy synchronized (sCached) { 71bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy for (int i = sCached.length; --i >= 0;) { 72bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy if (sCached[i] != null) { 73bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy tl = sCached[i]; 74bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy sCached[i] = null; 75e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return tl; 76e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 77e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 78e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 79e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl = new TextLine(); 80bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy if (DEBUG) { 81bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy Log.v("TLINE", "new: " + tl); 82bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy } 83e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return tl; 84e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 85e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 86e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 87e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Puts a TextLine back into the shared pool. Do not use this TextLine once 88e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * it has been returned. 89e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param tl the textLine 90e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return null, as a convenience from clearing references to the provided 91e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * TextLine 92e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 93e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt static TextLine recycle(TextLine tl) { 94e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl.mText = null; 95e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl.mPaint = null; 96e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl.mDirections = null; 97bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy synchronized(sCached) { 98bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy for (int i = 0; i < sCached.length; ++i) { 99bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy if (sCached[i] == null) { 100bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy sCached[i] = tl; 101f902d7bc49797ec277b4576c921dfffa15d741ddGilles Debunne break; 102e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 103e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 104e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 105e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return null; 106e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 107e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 108e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 109e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Initializes a TextLine and prepares it for use. 110e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 111e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param paint the base paint for the line 112e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param text the text, can be Styled 113e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the start of the line relative to the text 114e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the limit of the line relative to the text 115e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param dir the paragraph direction of this line 116e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param directions the directions information of this line 117e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param hasTabs true if the line might contain tabs or emoji 118c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt * @param tabStops the tabStops. Can be null. 119e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 120e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt void set(TextPaint paint, CharSequence text, int start, int limit, int dir, 121c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt Directions directions, boolean hasTabs, TabStops tabStops) { 122e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mPaint = paint; 123e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mText = text; 124e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mStart = start; 125e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mLen = limit - start; 126e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mDir = dir; 127e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mDirections = directions; 1288059e0903e36cbb5cf8b5c5d5d653acc9bbc8402Fabrice Di Meglio if (mDirections == null) { 1298059e0903e36cbb5cf8b5c5d5d653acc9bbc8402Fabrice Di Meglio throw new IllegalArgumentException("Directions cannot be null"); 1308059e0903e36cbb5cf8b5c5d5d653acc9bbc8402Fabrice Di Meglio } 131e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mHasTabs = hasTabs; 132e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mSpanned = null; 133e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 134e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean hasReplacement = false; 135e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (text instanceof Spanned) { 136e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mSpanned = (Spanned) text; 1371e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne ReplacementSpan[] spans = mSpanned.getSpans(start, limit, ReplacementSpan.class); 1381e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne spans = TextUtils.removeEmptySpans(spans, mSpanned, ReplacementSpan.class); 1391e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne hasReplacement = spans.length > 0; 140e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 141e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 1421e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne mCharsValid = hasReplacement || hasTabs || directions != Layout.DIRS_ALL_LEFT_TO_RIGHT; 143e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 144e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mCharsValid) { 145e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mChars == null || mChars.length < mLen) { 146e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mChars = new char[ArrayUtils.idealCharArraySize(mLen)]; 147e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 148e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextUtils.getChars(text, start, limit, mChars, 0); 1490c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (hasReplacement) { 1500c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // Handle these all at once so we don't have to do it as we go. 1510c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // Replace the first character of each replacement run with the 1520c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // object-replacement character and the remainder with zero width 1530c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // non-break space aka BOM. Cursor movement code skips these 1540c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // zero-width characters. 1550c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt char[] chars = mChars; 1560c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int i = start, inext; i < limit; i = inext) { 1571e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne inext = mSpanned.nextSpanTransition(i, limit, ReplacementSpan.class); 1581e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne ReplacementSpan[] spans = mSpanned.getSpans(i, inext, ReplacementSpan.class); 1591e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne spans = TextUtils.removeEmptySpans(spans, mSpanned, ReplacementSpan.class); 1601e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne if (spans.length > 0) { 1611e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne // transition into a span 1620c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt chars[i - start] = '\ufffc'; 1630c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int j = i - start + 1, e = inext - start; j < e; ++j) { 1640c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt chars[j] = '\ufeff'; // used as ZWNBS, marks positions to skip 1650c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 1660c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 1670c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 1680c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 169e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 170c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt mTabs = tabStops; 171e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 172e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 173e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 174e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Renders the TextLine. 175e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 176e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas to render on 177e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the leading margin position 178e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 179e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 180e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 181e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 182e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt void draw(Canvas c, float x, int top, int y, int bottom) { 183e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (!mHasTabs) { 184e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_LEFT_TO_RIGHT) { 185bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy drawRun(c, 0, mLen, false, x, top, y, bottom, false); 186e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return; 187e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 188e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_RIGHT_TO_LEFT) { 189bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy drawRun(c, 0, mLen, true, x, top, y, bottom, false); 190e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return; 191e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 192e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 193e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 194e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float h = 0; 195e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int[] runs = mDirections.mDirections; 196e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt RectF emojiRect = null; 197e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 198e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int lastRunIndex = runs.length - 2; 199e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int i = 0; i < runs.length; i += 2) { 200e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runStart = runs[i]; 201e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runLimit = runStart + (runs[i+1] & Layout.RUN_LENGTH_MASK); 202e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runLimit > mLen) { 203e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = mLen; 204e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 205e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean runIsRtl = (runs[i+1] & Layout.RUN_RTL_FLAG) != 0; 206e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 207e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int segstart = runStart; 208e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int j = mHasTabs ? runStart : runLimit; j <= runLimit; j++) { 209e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int codept = 0; 210e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Bitmap bm = null; 211e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 212e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mHasTabs && j < runLimit) { 213e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = mChars[j]; 214e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= 0xd800 && codept < 0xdc00 && j + 1 < runLimit) { 215e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = Character.codePointAt(mChars, j); 216e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= Layout.MIN_EMOJI && codept <= Layout.MAX_EMOJI) { 217e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt bm = Layout.EMOJI_FACTORY.getBitmapFromAndroidPua(codept); 218e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (codept > 0xffff) { 219e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt ++j; 220e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 221e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 222e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 223e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 224e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 225e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (j == runLimit || codept == '\t' || bm != null) { 226bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy h += drawRun(c, segstart, j, runIsRtl, x+h, top, y, bottom, 227e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt i != lastRunIndex || j != mLen); 228e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 229e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept == '\t') { 230e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h = mDir * nextTab(h * mDir); 231e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (bm != null) { 232e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float bmAscent = ascent(j); 233e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float bitmapHeight = bm.getHeight(); 234e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float scale = -bmAscent / bitmapHeight; 235e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float width = bm.getWidth() * scale; 236e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 237e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (emojiRect == null) { 238e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt emojiRect = new RectF(); 239e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 240e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt emojiRect.set(x + h, y + bmAscent, 241e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt x + h + width, y); 242e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt c.drawBitmap(bm, null, emojiRect, mPaint); 243e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h += width; 244e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt j++; 245e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 246e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt segstart = j + 1; 247e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 248e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 249e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 250e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 251e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 252e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 253e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns metrics information for the entire line. 254e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 255e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives font metrics information, can be null 256e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the line 257e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 258e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float metrics(FontMetricsInt fmi) { 259e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return measure(mLen, false, fmi); 260e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 261e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 262e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 263e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns information about a position on the line. 264e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 265e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param offset the line-relative character offset, between 0 and the 266e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * line length, inclusive 267e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param trailing true to measure the trailing edge of the character 268e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * before offset, false to measure the leading edge of the character 269e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * at offset. 270e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information about the requested 271e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * character, can be null. 272e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed offset from the leading margin to the requested 273e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * character edge. 274e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 275e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float measure(int offset, boolean trailing, FontMetricsInt fmi) { 276e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int target = trailing ? offset - 1 : offset; 277e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (target < 0) { 278e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return 0; 279e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 280e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 281e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float h = 0; 282e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 283e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (!mHasTabs) { 284e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_LEFT_TO_RIGHT) { 285bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy return measureRun(0, offset, mLen, false, fmi); 286e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 287e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_RIGHT_TO_LEFT) { 288bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy return measureRun(0, offset, mLen, true, fmi); 289e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 290e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 291e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 292e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt char[] chars = mChars; 293e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int[] runs = mDirections.mDirections; 294e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int i = 0; i < runs.length; i += 2) { 295e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runStart = runs[i]; 296e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runLimit = runStart + (runs[i+1] & Layout.RUN_LENGTH_MASK); 297e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runLimit > mLen) { 298e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = mLen; 299e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 300e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean runIsRtl = (runs[i+1] & Layout.RUN_RTL_FLAG) != 0; 301e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 302e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int segstart = runStart; 303e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int j = mHasTabs ? runStart : runLimit; j <= runLimit; j++) { 304e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int codept = 0; 305e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Bitmap bm = null; 306e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 307e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mHasTabs && j < runLimit) { 308e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = chars[j]; 309e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= 0xd800 && codept < 0xdc00 && j + 1 < runLimit) { 310e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = Character.codePointAt(chars, j); 311e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= Layout.MIN_EMOJI && codept <= Layout.MAX_EMOJI) { 312e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt bm = Layout.EMOJI_FACTORY.getBitmapFromAndroidPua(codept); 313e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (codept > 0xffff) { 314e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt ++j; 315e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 316e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 317e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 318e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 319e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 320e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (j == runLimit || codept == '\t' || bm != null) { 321e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean inSegment = target >= segstart && target < j; 322e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 323e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean advance = (mDir == Layout.DIR_RIGHT_TO_LEFT) == runIsRtl; 324e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (inSegment && advance) { 325bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy return h += measureRun(segstart, offset, j, runIsRtl, fmi); 326e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 327e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 328bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy float w = measureRun(segstart, j, j, runIsRtl, fmi); 329e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h += advance ? w : -w; 330e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 331e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (inSegment) { 332bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy return h += measureRun(segstart, offset, j, runIsRtl, null); 333e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 334e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 335e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept == '\t') { 336e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (offset == j) { 337e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h; 338e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 339e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h = mDir * nextTab(h * mDir); 340e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (target == j) { 341e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h; 342e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 343e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 344e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 345e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (bm != null) { 346e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float bmAscent = ascent(j); 347e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float wid = bm.getWidth() * -bmAscent / bm.getHeight(); 348e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h += mDir * wid; 349e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt j++; 350e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 351e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 352e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt segstart = j + 1; 353e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 354e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 355e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 356e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 357e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h; 358e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 359e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 360e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 361e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Draws a unidirectional (but possibly multi-styled) run of text. 362e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 363bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy * 364e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas to draw on 365e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the line-relative start 366e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the line-relative limit 367e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 368e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the position of the run that is closest to the leading margin 369e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 370e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 371e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 372e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width value is required. 373e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run, based on the paragraph direction. 374e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Only valid if needWidth is true. 375e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 376bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy private float drawRun(Canvas c, int start, 377e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int limit, boolean runIsRtl, float x, int top, int y, int bottom, 378e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean needWidth) { 379e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 380e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if ((mDir == Layout.DIR_LEFT_TO_RIGHT) == runIsRtl) { 381bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy float w = -measureRun(start, limit, limit, runIsRtl, null); 382bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy handleRun(start, limit, limit, runIsRtl, c, x + w, top, 3830c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt y, bottom, null, false); 384e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return w; 385e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 386e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 387bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy return handleRun(start, limit, limit, runIsRtl, c, x, top, 3880c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt y, bottom, null, needWidth); 389e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 390e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 391e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 392e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Measures a unidirectional (but possibly multi-styled) run of text. 393e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 394bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy * 395e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the line-relative start of the run 396e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param offset the offset to measure to, between start and limit inclusive 397e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the line-relative limit of the run 398e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 399e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information about the requested 400e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * run, can be null. 401e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width from the start of the run to the leading edge 402e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * of the character at offset, based on the run (not paragraph) direction 403e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 404bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy private float measureRun(int start, int offset, int limit, boolean runIsRtl, 405bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy FontMetricsInt fmi) { 406bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy return handleRun(start, offset, limit, runIsRtl, null, 0, 0, 0, 0, fmi, true); 407e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 408e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 409e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 410e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Walk the cursor through this line, skipping conjuncts and 411e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * zero-width characters. 412e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 413e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * <p>This function cannot properly walk the cursor off the ends of the line 414e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * since it does not know about any shaping on the previous/following line 415e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * that might affect the cursor position. Callers must either avoid these 416e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * situations or handle the result specially. 417e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 418e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param cursor the starting position of the cursor, between 0 and the 419e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * length of the line, inclusive 420e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param toLeft true if the caret is moving to the left. 421e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the new offset. If it is less than 0 or greater than the length 422e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * of the line, the previous/following line should be examined to get the 423e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * actual offset. 424e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 425e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int getOffsetToLeftRightOf(int cursor, boolean toLeft) { 426e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 1) The caret marks the leading edge of a character. The character 427e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // logically before it might be on a different level, and the active caret 428e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // position is on the character at the lower level. If that character 429e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // was the previous character, the caret is on its trailing edge. 430e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 2) Take this character/edge and move it in the indicated direction. 431e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // This gives you a new character and a new edge. 432e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 3) This position is between two visually adjacent characters. One of 433e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // these might be at a lower level. The active position is on the 434e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // character at the lower level. 435e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 4) If the active position is on the trailing edge of the character, 436e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the new caret position is the following logical character, else it 437e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // is the character. 438e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 439e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int lineStart = 0; 440e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int lineEnd = mLen; 441e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean paraIsRtl = mDir == -1; 442e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int[] runs = mDirections.mDirections; 443e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 444e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runIndex, runLevel = 0, runStart = lineStart, runLimit = lineEnd, newCaret = -1; 445e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean trailing = false; 446e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 447e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor == lineStart) { 448e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = -2; 449e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (cursor == lineEnd) { 450e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = runs.length; 451e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 452e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // First, get information about the run containing the character with 453e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the active caret. 454e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (runIndex = 0; runIndex < runs.length; runIndex += 2) { 455e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runStart = lineStart + runs[runIndex]; 456e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor >= runStart) { 457e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = runStart + (runs[runIndex+1] & Layout.RUN_LENGTH_MASK); 458e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runLimit > lineEnd) { 459e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = lineEnd; 460e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 461e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor < runLimit) { 462e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLevel = (runs[runIndex+1] >>> Layout.RUN_LEVEL_SHIFT) & 463e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Layout.RUN_LEVEL_MASK; 464e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor == runStart) { 465e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // The caret is on a run boundary, see if we should 466e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // use the position on the trailing edge of the previous 467e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // logical character instead. 468e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int prevRunIndex, prevRunLevel, prevRunStart, prevRunLimit; 469e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int pos = cursor - 1; 470e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (prevRunIndex = 0; prevRunIndex < runs.length; prevRunIndex += 2) { 471e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunStart = lineStart + runs[prevRunIndex]; 472e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (pos >= prevRunStart) { 473e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunLimit = prevRunStart + 474e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt (runs[prevRunIndex+1] & Layout.RUN_LENGTH_MASK); 475e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (prevRunLimit > lineEnd) { 476e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunLimit = lineEnd; 477e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 478e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (pos < prevRunLimit) { 479e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunLevel = (runs[prevRunIndex+1] >>> Layout.RUN_LEVEL_SHIFT) 480e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt & Layout.RUN_LEVEL_MASK; 481e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (prevRunLevel < runLevel) { 482e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Start from logically previous character. 483e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = prevRunIndex; 484e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLevel = prevRunLevel; 485e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runStart = prevRunStart; 486e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = prevRunLimit; 487e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt trailing = true; 488e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 489e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 490e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 491e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 492e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 493e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 494e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 495e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 496e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 497e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 498e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 499e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // caret might be == lineEnd. This is generally a space or paragraph 500e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // separator and has an associated run, but might be the end of 501e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // text, in which case it doesn't. If that happens, we ran off the 502e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // end of the run list, and runIndex == runs.length. In this case, 503e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // we are at a run boundary so we skip the below test. 504e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runIndex != runs.length) { 505e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean runIsRtl = (runLevel & 0x1) != 0; 506e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean advance = toLeft == runIsRtl; 507e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor != (advance ? runLimit : runStart) || advance != trailing) { 508e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Moving within or into the run, so we can move logically. 5090c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt newCaret = getOffsetBeforeAfter(runIndex, runStart, runLimit, 5100c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt runIsRtl, cursor, advance); 511e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // If the new position is internal to the run, we're at the strong 512e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // position already so we're finished. 513e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret != (advance ? runLimit : runStart)) { 514e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return newCaret; 515e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 516e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 517e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 518e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 519e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 520e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // If newCaret is -1, we're starting at a run boundary and crossing 521e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // into another run. Otherwise we've arrived at a run boundary, and 522e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // need to figure out which character to attach to. Note we might 523e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // need to run this twice, if we cross a run boundary and end up at 524e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // another run boundary. 525e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt while (true) { 526e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean advance = toLeft == paraIsRtl; 527e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunIndex = runIndex + (advance ? 2 : -2); 528e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (otherRunIndex >= 0 && otherRunIndex < runs.length) { 529e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunStart = lineStart + runs[otherRunIndex]; 530e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunLimit = otherRunStart + 531e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt (runs[otherRunIndex+1] & Layout.RUN_LENGTH_MASK); 532e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (otherRunLimit > lineEnd) { 533e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt otherRunLimit = lineEnd; 534e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 535e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunLevel = (runs[otherRunIndex+1] >>> Layout.RUN_LEVEL_SHIFT) & 536e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Layout.RUN_LEVEL_MASK; 537e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean otherRunIsRtl = (otherRunLevel & 1) != 0; 538e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 539e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt advance = toLeft == otherRunIsRtl; 540e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret == -1) { 5410c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt newCaret = getOffsetBeforeAfter(otherRunIndex, otherRunStart, 5420c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt otherRunLimit, otherRunIsRtl, 543e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt advance ? otherRunStart : otherRunLimit, advance); 544e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret == (advance ? otherRunLimit : otherRunStart)) { 545e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Crossed and ended up at a new boundary, 546e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // repeat a second and final time. 547e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = otherRunIndex; 548e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLevel = otherRunLevel; 549e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 550e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 551e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 552e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 553e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 554e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // The new caret is at a boundary. 555e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (otherRunLevel < runLevel) { 556e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // The strong character is in the other run. 557e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt newCaret = advance ? otherRunStart : otherRunLimit; 558e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 559e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 560e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 561e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 562e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret == -1) { 563e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // We're walking off the end of the line. The paragraph 564e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // level is always equal to or lower than any internal level, so 565e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the boundaries get the strong caret. 5660c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt newCaret = advance ? mLen + 1 : -1; 567e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 568e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 569e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 570e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Else we've arrived at the end of the line. That's a strong position. 571e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // We might have arrived here by crossing over a run with no internal 572e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // breaks and dropping out of the above loop before advancing one final 573e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // time, so reset the caret. 574e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Note, we use '<=' below to handle a situation where the only run 575e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // on the line is a counter-directional run. If we're not advancing, 576e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // we can end up at the 'lineEnd' position but the caret we want is at 577e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the lineStart. 578e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret <= lineEnd) { 579e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt newCaret = advance ? lineEnd : lineStart; 580e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 581e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 582e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 583e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 584e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return newCaret; 585e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 586e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 587e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 588e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns the next valid offset within this directional run, skipping 589e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * conjuncts and zero-width characters. This should not be called to walk 590cc3ec6cdb2b892eb29513e72d8b205acbe997b25Gilles Debunne * off the end of the line, since the returned values might not be valid 5910c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * on neighboring lines. If the returned offset is less than zero or 5920c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * greater than the line length, the offset should be recomputed on the 5930c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * preceding or following line, respectively. 594e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 595e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIndex the run index 5960c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param runStart the start of the run 5970c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param runLimit the limit of the run 5980c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param runIsRtl true if the run is right-to-left 599e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param offset the offset 600e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param after true if the new offset should logically follow the provided 601e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * offset 602e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the new offset 603e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 6040c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt private int getOffsetBeforeAfter(int runIndex, int runStart, int runLimit, 6050c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt boolean runIsRtl, int offset, boolean after) { 606e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 6070c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (runIndex < 0 || offset == (after ? mLen : 0)) { 6080c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // Walking off end of line. Since we don't know 6090c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // what cursor positions are available on other lines, we can't 6100c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // return accurate values. These are a guess. 611e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (after) { 6120c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return TextUtils.getOffsetAfter(mText, offset + mStart) - mStart; 6130c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6140c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return TextUtils.getOffsetBefore(mText, offset + mStart) - mStart; 6150c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6160c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6170c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt TextPaint wp = mWorkPaint; 6180c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt wp.set(mPaint); 6190c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6200c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int spanStart = runStart; 6210c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int spanLimit; 6220c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (mSpanned == null) { 6230c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt spanLimit = runLimit; 6240c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 6250c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int target = after ? offset + 1 : offset; 6260c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int limit = mStart + runLimit; 6270c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt while (true) { 6280c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt spanLimit = mSpanned.nextSpanTransition(mStart + spanStart, limit, 6290c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt MetricAffectingSpan.class) - mStart; 6300c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (spanLimit >= target) { 6310c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt break; 632e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 6330c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt spanStart = spanLimit; 6340c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6350c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6360c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt MetricAffectingSpan[] spans = mSpanned.getSpans(mStart + spanStart, 6370c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + spanLimit, MetricAffectingSpan.class); 6381e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne spans = TextUtils.removeEmptySpans(spans, mSpanned, MetricAffectingSpan.class); 6390c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6400c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (spans.length > 0) { 6410c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ReplacementSpan replacement = null; 6420c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int j = 0; j < spans.length; j++) { 6430c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt MetricAffectingSpan span = spans[j]; 6440c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (span instanceof ReplacementSpan) { 6450c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt replacement = (ReplacementSpan)span; 6460c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 6470c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt span.updateMeasureState(wp); 6480c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6490c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6500c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6510c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (replacement != null) { 6520c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // If we have a replacement span, we're moving either to 6530c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // the start or end of this span. 6540c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return after ? spanLimit : spanStart; 655e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 656e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 657e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 658e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 6590c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int flags = runIsRtl ? Paint.DIRECTION_RTL : Paint.DIRECTION_LTR; 6600c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int cursorOpt = after ? Paint.CURSOR_AFTER : Paint.CURSOR_BEFORE; 6610c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (mCharsValid) { 6620c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return wp.getTextRunCursor(mChars, spanStart, spanLimit - spanStart, 6630c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt flags, offset, cursorOpt); 6640c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 6650c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return wp.getTextRunCursor(mText, mStart + spanStart, 666345cb03315a0813ec57e44f97fc3fa4af6b3c309Gilles Debunne mStart + spanLimit, flags, mStart + offset, cursorOpt) - mStart; 667e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 668e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 669e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 670e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 6710bb000931bb841e75903d655552d1626ae158707Gilles Debunne * @param wp 6720bb000931bb841e75903d655552d1626ae158707Gilles Debunne */ 6730bb000931bb841e75903d655552d1626ae158707Gilles Debunne private static void expandMetricsFromPaint(FontMetricsInt fmi, TextPaint wp) { 6740bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousTop = fmi.top; 6750bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousAscent = fmi.ascent; 6760bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousDescent = fmi.descent; 6770bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousBottom = fmi.bottom; 6780bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousLeading = fmi.leading; 6790bb000931bb841e75903d655552d1626ae158707Gilles Debunne 6800bb000931bb841e75903d655552d1626ae158707Gilles Debunne wp.getFontMetricsInt(fmi); 6810bb000931bb841e75903d655552d1626ae158707Gilles Debunne 6828a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio updateMetrics(fmi, previousTop, previousAscent, previousDescent, previousBottom, 6838a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio previousLeading); 6848a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio } 6858a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio 6868a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio static void updateMetrics(FontMetricsInt fmi, int previousTop, int previousAscent, 6878a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio int previousDescent, int previousBottom, int previousLeading) { 6880bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.top = Math.min(fmi.top, previousTop); 6890bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.ascent = Math.min(fmi.ascent, previousAscent); 6900bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.descent = Math.max(fmi.descent, previousDescent); 6910bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.bottom = Math.max(fmi.bottom, previousBottom); 6920bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.leading = Math.max(fmi.leading, previousLeading); 6930bb000931bb841e75903d655552d1626ae158707Gilles Debunne } 6940bb000931bb841e75903d655552d1626ae158707Gilles Debunne 6950bb000931bb841e75903d655552d1626ae158707Gilles Debunne /** 696e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Utility function for measuring and rendering text. The text must 697e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * not include a tab or emoji. 698e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 699e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param wp the working paint 700e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the start of the text 7010c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param end the end of the text 702e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 703e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas, can be null if rendering is not needed 704e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the edge of the run closest to the leading margin 705e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 706e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 707e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 708e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information, can be null 709e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width of the run is needed 710e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run based on the run direction; only 711e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * valid if needWidth is true 712e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 7130c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt private float handleText(TextPaint wp, int start, int end, 7140c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextStart, int contextEnd, boolean runIsRtl, 7150c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt Canvas c, float x, int top, int y, int bottom, 716e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt FontMetricsInt fmi, boolean needWidth) { 717e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 718850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio // Get metrics first (even for empty strings or "0" width runs) 719850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio if (fmi != null) { 720850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio expandMetricsFromPaint(fmi, wp); 721850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio } 722e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 7230c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int runLen = end - start; 724850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio // No need to do anything if the run width is "0" 725850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio if (runLen == 0) { 726850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio return 0f; 727850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio } 728850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio 729850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio float ret = 0; 730850dffa01ba9111799f24800ae8550eca457d757Fabrice Di Meglio 7310c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextLen = contextEnd - contextStart; 732c9fd978da60f76c0576150c55629a034e1fa19fbGilles Debunne if (needWidth || (c != null && (wp.bgColor != 0 || wp.underlineColor != 0 || runIsRtl))) { 7330c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int flags = runIsRtl ? Paint.DIRECTION_RTL : Paint.DIRECTION_LTR; 734e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mCharsValid) { 7350c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ret = wp.getTextRunAdvances(mChars, start, runLen, 7360c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt contextStart, contextLen, flags, null, 0); 737e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 7380c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int delta = mStart; 7390c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ret = wp.getTextRunAdvances(mText, delta + start, 7400c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt delta + end, delta + contextStart, delta + contextEnd, 7410c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt flags, null, 0); 742e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 743e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 744e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 745e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (c != null) { 746e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runIsRtl) { 747e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt x -= ret; 748e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 749e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 750e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (wp.bgColor != 0) { 751dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne int previousColor = wp.getColor(); 752dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne Paint.Style previousStyle = wp.getStyle(); 753dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne 754e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.setColor(wp.bgColor); 755e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.setStyle(Paint.Style.FILL); 756e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt c.drawRect(x, top, x + ret, bottom, wp); 757e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 758dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne wp.setStyle(previousStyle); 759dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne wp.setColor(previousColor); 760dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne } 761dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne 762c9fd978da60f76c0576150c55629a034e1fa19fbGilles Debunne if (wp.underlineColor != 0) { 763dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne // kStdUnderline_Offset = 1/9, defined in SkTextFormatParams.h 764e6d368218918f911b1954296dab25bf84147b4c6Luca Zanolin float underlineTop = y + wp.baselineShift + (1.0f / 9.0f) * wp.getTextSize(); 765dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne 766dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne int previousColor = wp.getColor(); 767dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne Paint.Style previousStyle = wp.getStyle(); 768e6d368218918f911b1954296dab25bf84147b4c6Luca Zanolin boolean previousAntiAlias = wp.isAntiAlias(); 769dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne 770dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne wp.setStyle(Paint.Style.FILL); 771e6d368218918f911b1954296dab25bf84147b4c6Luca Zanolin wp.setAntiAlias(true); 772e6d368218918f911b1954296dab25bf84147b4c6Luca Zanolin 773c9fd978da60f76c0576150c55629a034e1fa19fbGilles Debunne wp.setColor(wp.underlineColor); 774c9fd978da60f76c0576150c55629a034e1fa19fbGilles Debunne c.drawRect(x, underlineTop, x + ret, underlineTop + wp.underlineThickness, wp); 775dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne 776dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne wp.setStyle(previousStyle); 777dd8f5ed79c7baed35b3f04e4778aff7867653255Gilles Debunne wp.setColor(previousColor); 778e6d368218918f911b1954296dab25bf84147b4c6Luca Zanolin wp.setAntiAlias(previousAntiAlias); 779e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 780e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 7810c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt drawTextRun(c, wp, start, end, contextStart, contextEnd, runIsRtl, 7820c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x, y + wp.baselineShift); 783e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 784e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 785e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return runIsRtl ? -ret : ret; 786e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 787e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 788e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 789e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Utility function for measuring and rendering a replacement. 790e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 791bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy * 792e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param replacement the replacement 793e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param wp the work paint 794e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the start of the run 795e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the limit of the run 796e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 797e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas, can be null if not rendering 798e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the edge of the replacement closest to the leading margin 799e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 800e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 801e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 802e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information, can be null 803e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width of the replacement is needed 804e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run based on the run direction; only 805e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * valid if needWidth is true 806e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 807e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private float handleReplacement(ReplacementSpan replacement, TextPaint wp, 808bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy int start, int limit, boolean runIsRtl, Canvas c, 809e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float x, int top, int y, int bottom, FontMetricsInt fmi, 8100c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt boolean needWidth) { 811e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 812e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float ret = 0; 813e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8140c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int textStart = mStart + start; 8150c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int textLimit = mStart + limit; 816e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8170c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (needWidth || (c != null && runIsRtl)) { 8188a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio int previousTop = 0; 8198a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio int previousAscent = 0; 8208a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio int previousDescent = 0; 8218a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio int previousBottom = 0; 8228a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio int previousLeading = 0; 8238a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio 8248a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio boolean needUpdateMetrics = (fmi != null); 8258a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio 8268a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio if (needUpdateMetrics) { 8278a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio previousTop = fmi.top; 8288a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio previousAscent = fmi.ascent; 8298a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio previousDescent = fmi.descent; 8308a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio previousBottom = fmi.bottom; 8318a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio previousLeading = fmi.leading; 8328a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio } 8338a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio 8340c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ret = replacement.getSize(wp, mText, textStart, textLimit, fmi); 8358a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio 8368a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio if (needUpdateMetrics) { 8378a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio updateMetrics(fmi, previousTop, previousAscent, previousDescent, previousBottom, 8388a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio previousLeading); 8398a5137a5aeba39cbc2c57c83ef79241b446d0cb7Fabrice Di Meglio } 8400c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 841e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8420c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (c != null) { 8430c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (runIsRtl) { 8440c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x -= ret; 845e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 8460c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt replacement.draw(c, mText, textStart, textLimit, 8470c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x, top, y, bottom, wp); 848e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 849e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 850e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return runIsRtl ? -ret : ret; 851e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 852e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 853e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 854e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Utility function for handling a unidirectional run. The run must not 855e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * contain tabs or emoji but can contain styles. 856e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 857bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy * 858e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the line-relative start of the run 8590c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param measureLimit the offset to measure to, between start and limit inclusive 860e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the limit of the run 861e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 862e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas, can be null 863e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the end of the run closest to the leading margin 864e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 865e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 866e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 867e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information, can be null 868e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width is required 869e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run based on the run direction; only 870e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * valid if needWidth is true 871e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 872bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy private float handleRun(int start, int measureLimit, 873e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int limit, boolean runIsRtl, Canvas c, float x, int top, int y, 8740c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int bottom, FontMetricsInt fmi, boolean needWidth) { 875e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 876f483e514d4ed3b93cc5ba22beb9c85efcda75535Gilles Debunne // Case of an empty line, make sure we update fmi according to mPaint 877f483e514d4ed3b93cc5ba22beb9c85efcda75535Gilles Debunne if (start == measureLimit) { 878f483e514d4ed3b93cc5ba22beb9c85efcda75535Gilles Debunne TextPaint wp = mWorkPaint; 879f483e514d4ed3b93cc5ba22beb9c85efcda75535Gilles Debunne wp.set(mPaint); 88015c097a1c23105cdc0dd66dd5605ff35467d7118Fabrice Di Meglio if (fmi != null) { 88115c097a1c23105cdc0dd66dd5605ff35467d7118Fabrice Di Meglio expandMetricsFromPaint(fmi, wp); 88215c097a1c23105cdc0dd66dd5605ff35467d7118Fabrice Di Meglio } 88315c097a1c23105cdc0dd66dd5605ff35467d7118Fabrice Di Meglio return 0f; 884f483e514d4ed3b93cc5ba22beb9c85efcda75535Gilles Debunne } 885f483e514d4ed3b93cc5ba22beb9c85efcda75535Gilles Debunne 886e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Shaping needs to take into account context up to metric boundaries, 887e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // but rendering needs to take into account character style boundaries. 8880c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // So we iterate through metric runs to get metric bounds, 8890c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // then within each metric run iterate through character style runs 8900c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // for the run bounds. 891e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float ox = x; 8920c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int i = start, inext; i < measureLimit; i = inext) { 893e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextPaint wp = mWorkPaint; 894e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.set(mPaint); 895e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8960c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int mlimit; 897e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mSpanned == null) { 898e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt inext = limit; 8990c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mlimit = measureLimit; 900e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 901e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt inext = mSpanned.nextSpanTransition(mStart + i, mStart + limit, 902e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan.class) - mStart; 903e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 9040c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mlimit = inext < measureLimit ? inext : measureLimit; 905e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan[] spans = mSpanned.getSpans(mStart + i, 9060c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + mlimit, MetricAffectingSpan.class); 9071e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne spans = TextUtils.removeEmptySpans(spans, mSpanned, MetricAffectingSpan.class); 908e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 909e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (spans.length > 0) { 910e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt ReplacementSpan replacement = null; 911e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int j = 0; j < spans.length; j++) { 912e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan span = spans[j]; 913e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (span instanceof ReplacementSpan) { 914e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt replacement = (ReplacementSpan)span; 915e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 9160c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // We might have a replacement that uses the draw 9170c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // state, otherwise measure state would suffice. 9180c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt span.updateDrawState(wp); 919e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 920e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 921e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 922e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (replacement != null) { 923bc7cdb6783d059249133b1c0baf52c305c6b4a33Romain Guy x += handleReplacement(replacement, wp, i, 9240c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mlimit, runIsRtl, c, x, top, y, bottom, fmi, 9250c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt needWidth || mlimit < measureLimit); 926e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 927e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 928e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 929e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 930e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 9310c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (mSpanned == null || c == null) { 9320c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x += handleText(wp, i, mlimit, i, inext, runIsRtl, c, x, top, 9330c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt y, bottom, fmi, needWidth || mlimit < measureLimit); 9340c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 9350c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int j = i, jnext; j < mlimit; j = jnext) { 9360c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt jnext = mSpanned.nextSpanTransition(mStart + j, 9370c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + mlimit, CharacterStyle.class) - mStart; 938e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 9390c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt CharacterStyle[] spans = mSpanned.getSpans(mStart + j, 9400c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + jnext, CharacterStyle.class); 9411e3ac18e7ad03e02819f3e1a89d6a80a2bb7645fGilles Debunne spans = TextUtils.removeEmptySpans(spans, mSpanned, CharacterStyle.class); 942e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 9430c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt wp.set(mPaint); 9440c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int k = 0; k < spans.length; k++) { 9450c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt CharacterStyle span = spans[k]; 9460c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt span.updateDrawState(wp); 947e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 9480c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 9490c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x += handleText(wp, j, jnext, i, inext, runIsRtl, c, x, 9500c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt top, y, bottom, fmi, needWidth || jnext < measureLimit); 951e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 952e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 953e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 954e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 955e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return x - ox; 956e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 957e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 958e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 959e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Render a text run with the set-up paint. 960e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 961e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas 962e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param wp the paint used to render the text 9630c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param start the start of the run 9640c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param end the end of the run 9650c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param contextStart the start of context for the run 9660c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param contextEnd the end of the context for the run 967e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 968e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the x position of the left edge of the run 969e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline of the run 970e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 9710c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt private void drawTextRun(Canvas c, TextPaint wp, int start, int end, 9720c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextStart, int contextEnd, boolean runIsRtl, float x, int y) { 973e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 974f47d7405bbcb25d7cdf89ebb059f41520fe9ab87Doug Felt int flags = runIsRtl ? Canvas.DIRECTION_RTL : Canvas.DIRECTION_LTR; 975e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mCharsValid) { 9760c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int count = end - start; 9770c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextCount = contextEnd - contextStart; 9780c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt c.drawTextRun(mChars, start, count, contextStart, contextCount, 9790c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x, y, flags, wp); 980e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 9810c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int delta = mStart; 9820c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt c.drawTextRun(mText, delta + start, delta + end, 9830c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt delta + contextStart, delta + contextEnd, x, y, flags, wp); 984e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 985e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 986e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 987e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 988e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns the ascent of the text at start. This is used for scaling 989e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * emoji. 990e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 991e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param pos the line-relative position 992e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the ascent of the text at start 993e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 994e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float ascent(int pos) { 995e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mSpanned == null) { 996e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return mPaint.ascent(); 997e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 998e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 999e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt pos += mStart; 1000e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan[] spans = mSpanned.getSpans(pos, pos + 1, 1001e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan.class); 1002e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (spans.length == 0) { 1003e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return mPaint.ascent(); 1004e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 1005e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 1006e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextPaint wp = mWorkPaint; 1007e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.set(mPaint); 1008e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (MetricAffectingSpan span : spans) { 1009e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt span.updateMeasureState(wp); 1010e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 1011e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return wp.ascent(); 1012e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 1013e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 1014e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 1015e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns the next tab position. 1016e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 1017e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param h the (unsigned) offset from the leading margin 1018e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the (unsigned) tab position after this offset 1019e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 1020e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float nextTab(float h) { 1021c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt if (mTabs != null) { 1022c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt return mTabs.nextTab(h); 1023e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 1024c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt return TabStops.nextDefaultStop(h, TAB_INCREMENT); 1025e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 1026e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 1027e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private static final int TAB_INCREMENT = 20; 1028e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt} 1029