Merge "Optimize GraphemeClusterSegmentFinder performance" into udc-dev am: ee75e04f4a (db47d915) · Commits · e / os / android_frameworks_base

core/java/android/text/GraphemeClusterSegmentFinder.java

+47 −24

Original line number	Diff line number	Diff line
		@@ -18,7 +18,8 @@ package android.text;

		import android.annotation.IntRange;
		import android.annotation.NonNull;
		import android.graphics.Paint;
		import android.graphics.TemporaryBuffer;
		import android.graphics.text.GraphemeBreak;

		/**
		* Implementation of {@code SegmentFinder} using grapheme clusters as the text segment. Whitespace
		@@ -31,8 +32,8 @@ import android.graphics.Paint;
		* Segmentation - Grapheme Cluster Boundaries</a>
		*/
		public class GraphemeClusterSegmentFinder extends SegmentFinder {
		private final CharSequence mText;
		private final TextPaint mTextPaint;
		private static AutoGrowArray.FloatArray sTempAdvances = null;
		private final boolean[] mIsGraphemeBreak;

		/**
		* Constructs a GraphemeClusterSegmentFinder instance for the specified text which uses the
		@@ -43,51 +44,73 @@ public class GraphemeClusterSegmentFinder extends SegmentFinder {
		*/
		public GraphemeClusterSegmentFinder(
		@NonNull CharSequence text, @NonNull TextPaint textPaint) {
		mText = text;
		mTextPaint = textPaint;

		if (sTempAdvances == null) {
		sTempAdvances = new AutoGrowArray.FloatArray(text.length());
		} else if (sTempAdvances.size() < text.length()) {
		sTempAdvances.resize(text.length());
		}

		mIsGraphemeBreak = new boolean[text.length()];
		float[] advances = sTempAdvances.getRawArray();
		char[] chars = TemporaryBuffer.obtain(text.length());

		TextUtils.getChars(text, 0, text.length(), chars, 0);

		textPaint.getTextWidths(chars, 0, text.length(), advances);

		GraphemeBreak.isGraphemeBreak(advances, chars, /* start= / 0, / end= */ text.length(),
		mIsGraphemeBreak);
		TemporaryBuffer.recycle(chars);
		}

		private int previousBoundary(@IntRange(from = 0) int offset) {
		if (offset <= 0) return DONE;
		do {
		--offset;
		} while (offset > 0 && !mIsGraphemeBreak[offset]);
		return offset;
		}

		private int nextBoundary(@IntRange(from = 0) int offset) {
		if (offset >= mIsGraphemeBreak.length) return DONE;
		do {
		++offset;
		} while (offset < mIsGraphemeBreak.length && !mIsGraphemeBreak[offset]);
		return offset;
		}

		@Override
		public int previousStartBoundary(@IntRange(from = 0) int offset) {
		if (offset == 0) return DONE;
		int boundary = mTextPaint.getTextRunCursor(
		mText, 0, mText.length(), false, offset, Paint.CURSOR_BEFORE);
		return boundary == -1 ? DONE : boundary;
		return previousBoundary(offset);
		}

		@Override
		public int previousEndBoundary(@IntRange(from = 0) int offset) {
		if (offset == 0) return DONE;
		int boundary = mTextPaint.getTextRunCursor(
		mText, 0, mText.length(), false, offset, Paint.CURSOR_BEFORE);
		int boundary = previousBoundary(offset);
		// Check that there is another cursor position before, otherwise this is not a valid
		// end boundary.
		if (mTextPaint.getTextRunCursor(
		mText, 0, mText.length(), false, boundary, Paint.CURSOR_BEFORE) == -1) {
		if (boundary == DONE \|\| previousBoundary(boundary) == DONE) {
		return DONE;
		}
		return boundary == -1 ? DONE : boundary;
		return boundary;
		}

		@Override
		public int nextStartBoundary(@IntRange(from = 0) int offset) {
		if (offset == mText.length()) return DONE;
		int boundary = mTextPaint.getTextRunCursor(
		mText, 0, mText.length(), false, offset, Paint.CURSOR_AFTER);
		if (offset == mIsGraphemeBreak.length) return DONE;
		int boundary = nextBoundary(offset);
		// Check that there is another cursor position after, otherwise this is not a valid
		// start boundary.
		if (mTextPaint.getTextRunCursor(
		mText, 0, mText.length(), false, boundary, Paint.CURSOR_AFTER) == -1) {
		if (boundary == DONE \|\| nextBoundary(boundary) == DONE) {
		return DONE;
		}
		return boundary == -1 ? DONE : boundary;
		return boundary;
		}

		@Override
		public int nextEndBoundary(@IntRange(from = 0) int offset) {
		if (offset == mText.length()) return DONE;
		int boundary = mTextPaint.getTextRunCursor(
		mText, 0, mText.length(), false, offset, Paint.CURSOR_AFTER);
		return boundary == -1 ? DONE : boundary;
		return nextBoundary(offset);
		}
		}

graphics/java/android/graphics/text/GraphemeBreak.java

0 → 100644

+59 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2023 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.graphics.text;

		/** @hide */
		public class GraphemeBreak {
		private GraphemeBreak() { }

		/**
		* Util method that checks if the offsets in given range are grapheme break.
		*
		* @param advances the advances of characters in the given text. It contains the font
		* information used by the algorithm to determine the grapheme break. It's useful
		* when some character is missing in the font. For example, if the smile emoji
		* "0xD83D 0xDE0A" is not found in the font and is displayed as 2 characters.
		* We can't treat it as a single grapheme cluster.
		* @param text the text to be processed.
		* @param start the start offset of the queried range, inclusive.
		* @param end the end offset of the queried range, exclusive.
		* @param isGraphemeBreak the array to receive the result. The i-th element of the
		* array will be set to true if the offset (start + i) is a grapheme
		* break; otherwise, it will be set to false.
		*/
		public static void isGraphemeBreak(float[] advances, char[] text, int start, int end,
		boolean[] isGraphemeBreak) {
		if (start > end) {
		throw new IllegalArgumentException("start is greater than end: start = " + start
		+ " end = " + end);
		}
		if (advances.length < end) {
		throw new IllegalArgumentException("the length of advances is less than end"
		+ "advances.length = " + advances.length
		+ " end = " + end);
		}
		if (isGraphemeBreak.length < end - start) {
		throw new IndexOutOfBoundsException("isGraphemeBreak doesn't have enough space to "
		+ "receive the result, isGraphemeBreak.length: " + isGraphemeBreak.length
		+ " needed space: " + (end - start));
		}
		nIsGraphemeBreak(advances, text, start, end, isGraphemeBreak);
		}

		private static native void nIsGraphemeBreak(float[] advances, char[] text, int start, int end,
		boolean[] isGraphemeBreak);
		}

libs/hwui/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -375,6 +375,7 @@ cc_defaults {
		"jni/text/LineBreaker.cpp",
		"jni/text/MeasuredText.cpp",
		"jni/text/TextShaper.cpp",
		"jni/text/GraphemeBreak.cpp",
		],

		header_libs: [

libs/hwui/apex/LayoutlibLoader.cpp

+3 −0

Original line number	Diff line number	Diff line
		@@ -66,6 +66,7 @@ extern int register_android_graphics_fonts_FontFamily(JNIEnv* env);
		extern int register_android_graphics_text_LineBreaker(JNIEnv* env);
		extern int register_android_graphics_text_MeasuredText(JNIEnv* env);
		extern int register_android_graphics_text_TextShaper(JNIEnv* env);
		extern int register_android_graphics_text_GraphemeBreak(JNIEnv* env);

		extern int register_android_util_PathParser(JNIEnv* env);
		extern int register_android_view_DisplayListCanvas(JNIEnv* env);
		@@ -125,6 +126,8 @@ static const std::unordered_map<std::string, RegJNIRec> gRegJNIMap = {
		{"android.graphics.text.MeasuredText",
		REG_JNI(register_android_graphics_text_MeasuredText)},
		{"android.graphics.text.TextRunShaper", REG_JNI(register_android_graphics_text_TextShaper)},
		{"android.graphics.text.GraphemeBreak",
		REG_JNI(register_android_graphics_text_GraphemeBreak)},
		{"android.util.PathParser", REG_JNI(register_android_util_PathParser)},
		};

libs/hwui/apex/jni_runtime.cpp

+2 −0

Original line number	Diff line number	Diff line
		@@ -77,6 +77,7 @@ extern int register_android_graphics_pdf_PdfRenderer(JNIEnv* env);
		extern int register_android_graphics_text_MeasuredText(JNIEnv* env);
		extern int register_android_graphics_text_LineBreaker(JNIEnv *env);
		extern int register_android_graphics_text_TextShaper(JNIEnv *env);
		extern int register_android_graphics_text_GraphemeBreak(JNIEnv* env);
		extern int register_android_graphics_MeshSpecification(JNIEnv* env);
		extern int register_android_graphics_Mesh(JNIEnv* env);

		@@ -148,6 +149,7 @@ extern int register_android_graphics_HardwareBufferRenderer(JNIEnv* env);
		REG_JNI(register_android_graphics_text_MeasuredText),
		REG_JNI(register_android_graphics_text_LineBreaker),
		REG_JNI(register_android_graphics_text_TextShaper),
		REG_JNI(register_android_graphics_text_GraphemeBreak),
		REG_JNI(register_android_graphics_MeshSpecification),
		REG_JNI(register_android_graphics_Mesh),