Refactor MeasuredText (75492afb) · Commits · e / os / android_frameworks_base

core/java/android/text/AutoGrowArray.java

0 → 100644

+374 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2017 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.text;

		import android.annotation.IntRange;
		import android.annotation.NonNull;

		import com.android.internal.util.ArrayUtils;

		import libcore.util.EmptyArray;

		/**
		* Implements a growing array of int primitives.
		*
		* These arrays are NOT thread safe.
		*
		* @hide
		*/
		public final class AutoGrowArray {
		private static final int MIN_CAPACITY_INCREMENT = 12;
		private static final int MAX_CAPACITY_TO_BE_KEPT = 10000;

		/**
		* Returns next capacity size.
		*
		* The returned capacity is larger than requested capacity.
		*/
		private static int computeNewCapacity(int currentSize, int requested) {
		final int targetCapacity = currentSize + (currentSize < (MIN_CAPACITY_INCREMENT / 2)
		? MIN_CAPACITY_INCREMENT : currentSize >> 1);
		return targetCapacity > requested ? targetCapacity : requested;
		}

		/**
		* An auto growing byte array.
		*/
		public static class ByteArray {

		private @NonNull byte[] mValues;
		private @IntRange(from = 0) int mSize;

		/**
		* Creates an empty ByteArray with the default initial capacity.
		*/
		public ByteArray() {
		this(10);
		}

		/**
		* Creates an empty ByteArray with the specified initial capacity.
		*/
		public ByteArray(@IntRange(from = 0) int initialCapacity) {
		if (initialCapacity == 0) {
		mValues = EmptyArray.BYTE;
		} else {
		mValues = ArrayUtils.newUnpaddedByteArray(initialCapacity);
		}
		mSize = 0;
		}

		/**
		* Changes the size of this ByteArray. If this ByteArray is shrinked, the backing array
		* capacity is unchanged.
		*/
		public void resize(@IntRange(from = 0) int newSize) {
		if (newSize > mValues.length) {
		ensureCapacity(newSize - mSize);
		}
		mSize = newSize;
		}

		/**
		* Appends the specified value to the end of this array.
		*/
		public void append(byte value) {
		ensureCapacity(1);
		mValues[mSize++] = value;
		}

		/**
		* Ensures capacity to append at least <code>count</code> values.
		*/
		private void ensureCapacity(@IntRange int count) {
		final int requestedSize = mSize + count;
		if (requestedSize >= mValues.length) {
		final int newCapacity = computeNewCapacity(mSize, requestedSize);
		final byte[] newValues = ArrayUtils.newUnpaddedByteArray(newCapacity);
		System.arraycopy(mValues, 0, newValues, 0, mSize);
		mValues = newValues;
		}
		}

		/**
		* Removes all values from this array.
		*/
		public void clear() {
		mSize = 0;
		}

		/**
		* Removes all values from this array and release the internal array object if it is too
		* large.
		*/
		public void clearWithReleasingLargeArray() {
		clear();
		if (mValues.length > MAX_CAPACITY_TO_BE_KEPT) {
		mValues = EmptyArray.BYTE;
		}
		}

		/**
		* Returns the value at the specified position in this array.
		*/
		public byte get(@IntRange(from = 0) int index) {
		return mValues[index];
		}

		/**
		* Sets the value at the specified position in this array.
		*/
		public void set(@IntRange(from = 0) int index, byte value) {
		mValues[index] = value;
		}

		/**
		* Returns the number of values in this array.
		*/
		public @IntRange(from = 0) int size() {
		return mSize;
		}

		/**
		* Returns internal raw array.
		*
		* Note that this array may have larger size than you requested.
		* Use size() instead for getting the actual array size.
		*/
		public @NonNull byte[] getRawArray() {
		return mValues;
		}
		}

		/**
		* An auto growing int array.
		*/
		public static class IntArray {

		private @NonNull int[] mValues;
		private @IntRange(from = 0) int mSize;

		/**
		* Creates an empty IntArray with the default initial capacity.
		*/
		public IntArray() {
		this(10);
		}

		/**
		* Creates an empty IntArray with the specified initial capacity.
		*/
		public IntArray(@IntRange(from = 0) int initialCapacity) {
		if (initialCapacity == 0) {
		mValues = EmptyArray.INT;
		} else {
		mValues = ArrayUtils.newUnpaddedIntArray(initialCapacity);
		}
		mSize = 0;
		}

		/**
		* Changes the size of this IntArray. If this IntArray is shrinked, the backing array
		* capacity is unchanged.
		*/
		public void resize(@IntRange(from = 0) int newSize) {
		if (newSize > mValues.length) {
		ensureCapacity(newSize - mSize);
		}
		mSize = newSize;
		}

		/**
		* Appends the specified value to the end of this array.
		*/
		public void append(int value) {
		ensureCapacity(1);
		mValues[mSize++] = value;
		}

		/**
		* Ensures capacity to append at least <code>count</code> values.
		*/
		private void ensureCapacity(@IntRange(from = 0) int count) {
		final int requestedSize = mSize + count;
		if (requestedSize >= mValues.length) {
		final int newCapacity = computeNewCapacity(mSize, requestedSize);
		final int[] newValues = ArrayUtils.newUnpaddedIntArray(newCapacity);
		System.arraycopy(mValues, 0, newValues, 0, mSize);
		mValues = newValues;
		}
		}

		/**
		* Removes all values from this array.
		*/
		public void clear() {
		mSize = 0;
		}

		/**
		* Removes all values from this array and release the internal array object if it is too
		* large.
		*/
		public void clearWithReleasingLargeArray() {
		clear();
		if (mValues.length > MAX_CAPACITY_TO_BE_KEPT) {
		mValues = EmptyArray.INT;
		}
		}

		/**
		* Returns the value at the specified position in this array.
		*/
		public int get(@IntRange(from = 0) int index) {
		return mValues[index];
		}

		/**
		* Sets the value at the specified position in this array.
		*/
		public void set(@IntRange(from = 0) int index, int value) {
		mValues[index] = value;
		}

		/**
		* Returns the number of values in this array.
		*/
		public @IntRange(from = 0) int size() {
		return mSize;
		}

		/**
		* Returns internal raw array.
		*
		* Note that this array may have larger size than you requested.
		* Use size() instead for getting the actual array size.
		*/
		public @NonNull int[] getRawArray() {
		return mValues;
		}
		}

		/**
		* An auto growing float array.
		*/
		public static class FloatArray {

		private @NonNull float[] mValues;
		private @IntRange(from = 0) int mSize;

		/**
		* Creates an empty FloatArray with the default initial capacity.
		*/
		public FloatArray() {
		this(10);
		}

		/**
		* Creates an empty FloatArray with the specified initial capacity.
		*/
		public FloatArray(@IntRange(from = 0) int initialCapacity) {
		if (initialCapacity == 0) {
		mValues = EmptyArray.FLOAT;
		} else {
		mValues = ArrayUtils.newUnpaddedFloatArray(initialCapacity);
		}
		mSize = 0;
		}

		/**
		* Changes the size of this FloatArray. If this FloatArray is shrinked, the backing array
		* capacity is unchanged.
		*/
		public void resize(@IntRange(from = 0) int newSize) {
		if (newSize > mValues.length) {
		ensureCapacity(newSize - mSize);
		}
		mSize = newSize;
		}

		/**
		* Appends the specified value to the end of this array.
		*/
		public void append(float value) {
		ensureCapacity(1);
		mValues[mSize++] = value;
		}

		/**
		* Ensures capacity to append at least <code>count</code> values.
		*/
		private void ensureCapacity(int count) {
		final int requestedSize = mSize + count;
		if (requestedSize >= mValues.length) {
		final int newCapacity = computeNewCapacity(mSize, requestedSize);
		final float[] newValues = ArrayUtils.newUnpaddedFloatArray(newCapacity);
		System.arraycopy(mValues, 0, newValues, 0, mSize);
		mValues = newValues;
		}
		}

		/**
		* Removes all values from this array.
		*/
		public void clear() {
		mSize = 0;
		}

		/**
		* Removes all values from this array and release the internal array object if it is too
		* large.
		*/
		public void clearWithReleasingLargeArray() {
		clear();
		if (mValues.length > MAX_CAPACITY_TO_BE_KEPT) {
		mValues = EmptyArray.FLOAT;
		}
		}

		/**
		* Returns the value at the specified position in this array.
		*/
		public float get(@IntRange(from = 0) int index) {
		return mValues[index];
		}

		/**
		* Sets the value at the specified position in this array.
		*/
		public void set(@IntRange(from = 0) int index, float value) {
		mValues[index] = value;
		}

		/**
		* Returns the number of values in this array.
		*/
		public @IntRange(from = 0) int size() {
		return mSize;
		}

		/**
		* Returns internal raw array.
		*
		* Note that this array may have larger size than you requested.
		* Use size() instead for getting the actual array size.
		*/
		public @NonNull float[] getRawArray() {
		return mValues;
		}
		}
		}

core/java/android/text/Layout.java

+14 −15

Original line number	Diff line number	Diff line
		@@ -1907,22 +1907,14 @@ public abstract class Layout {

		private static float measurePara(TextPaint paint, CharSequence text, int start, int end,
		TextDirectionHeuristic textDir) {
		MeasuredText mt = MeasuredText.obtain();
		MeasuredText mt = null;
		TextLine tl = TextLine.obtain();
		try {
		mt.setPara(text, start, end, textDir);
		Directions directions;
		int dir;
		if (mt.mEasy) {
		directions = DIRS_ALL_LEFT_TO_RIGHT;
		dir = Layout.DIR_LEFT_TO_RIGHT;
		} else {
		directions = AndroidBidi.directions(mt.mDir, mt.mLevels,
		0, mt.mChars, 0, mt.mLen);
		dir = mt.mDir;
		}
		char[] chars = mt.mChars;
		int len = mt.mLen;
		mt = MeasuredText.buildForBidi(text, start, end, textDir, mt);
		final char[] chars = mt.getChars();
		final int len = chars.length;
		final Directions directions = mt.getDirections(0, len);
		final int dir = mt.getParagraphDir();
		boolean hasTabs = false;
		TabStops tabStops = null;
		// leading margins should be taken into account when measuring a paragraph
		@@ -1955,7 +1947,9 @@ public abstract class Layout {
		return margin + Math.abs(tl.metrics(null));
		} finally {
		TextLine.recycle(tl);
		MeasuredText.recycle(mt);
		if (mt != null) {
		mt.recycle();
		}
		}
		}

		@@ -2272,6 +2266,11 @@ public abstract class Layout {
		private SpanSet<LineBackgroundSpan> mLineBackgroundSpans;
		private int mJustificationMode;

		/** @hide */
		@IntDef({DIR_LEFT_TO_RIGHT, DIR_RIGHT_TO_LEFT})
		@Retention(RetentionPolicy.SOURCE)
		public @interface Direction {}

		public static final int DIR_LEFT_TO_RIGHT = 1;
		public static final int DIR_RIGHT_TO_LEFT = -1;