Revert "DO NOT MERGE Implement line breaking using ICU break iterator"

This reverts commit 0c87dfd25d5a305fb67eb328d114aada87055dd7.

Change-Id: Ibc300bb945776594099b69965cabe7220d10de2f

4 files changed, 106 insertions, 130 deletions

diff --git a/core/java/android/text/StaticLayout.java b/core/java/android/text/StaticLayout.java
index 3aad4aa..814326c 100644
--- a/core/java/android/text/StaticLayout.java
+++ b/core/java/android/text/StaticLayout.java
@@ -161,9 +161,6 @@ public class StaticLayout extends Layout {
                         float spacingadd, boolean includepad,
                         boolean trackpad, float ellipsizedWidth,
                         TextUtils.TruncateAt ellipsize) {
-        int[] breakOpp = null;
-        final String localeLanguageTag = paint.getTextLocale().toLanguageTag();
-
         mLineCount = 0;
 
         int v = 0;
@@ -178,6 +175,8 @@ public class StaticLayout extends Layout {
         if (source instanceof Spanned)
             spanned = (Spanned) source;
 
+        int DEFAULT_DIR = DIR_LEFT_TO_RIGHT; // XXX
+
         int paraEnd;
         for (int paraStart = bufStart; paraStart <= bufEnd; paraStart = paraEnd) {
             paraEnd = TextUtils.indexOf(source, CHAR_NEW_LINE, paraStart, bufEnd);
@@ -244,9 +243,6 @@ public class StaticLayout extends Layout {
             int dir = measured.mDir;
             boolean easy = measured.mEasy;
 
-            breakOpp = nLineBreakOpportunities(localeLanguageTag, chs, paraEnd - paraStart, breakOpp);
-            int breakOppIndex = 0;
-
             int width = firstWidth;
 
             float w = 0;
@@ -359,12 +355,15 @@ public class StaticLayout extends Layout {
                         if (fmBottom > fitBottom)
                             fitBottom = fmBottom;
 
-                        while (breakOpp[breakOppIndex] != -1
-                                && breakOpp[breakOppIndex] < j - paraStart + 1) {
-                            breakOppIndex++;
-                        }
-                        boolean isLineBreak = breakOppIndex < breakOpp.length &&
-                                breakOpp[breakOppIndex] == j - paraStart + 1;
+                        // From the Unicode Line Breaking Algorithm (at least approximately)
+                        boolean isLineBreak = isSpaceOrTab ||
+                                // / is class SY and - is class HY, except when followed by a digit
+                                ((c == CHAR_SLASH || c == CHAR_HYPHEN) &&
+                                (j + 1 >= spanEnd || !Character.isDigit(chs[j + 1 - paraStart]))) ||
+                                // Ideographs are class ID: breakpoints when adjacent, except for NS
+                                // (non-starters), which can be broken after but not before
+                                (c >= CHAR_FIRST_CJK && isIdeographic(c, true) &&
+                                j + 1 < spanEnd && isIdeographic(chs[j + 1 - paraStart], false));
 
                         if (isLineBreak) {
                             okWidth = w;
@@ -492,6 +491,97 @@ public class StaticLayout extends Layout {
         }
     }
 
+    /**
+     * Returns true if the specified character is one of those specified
+     * as being Ideographic (class ID) by the Unicode Line Breaking Algorithm
+     * (http://www.unicode.org/unicode/reports/tr14/), and is therefore OK
+     * to break between a pair of.
+     *
+     * @param includeNonStarters also return true for category NS
+     *                           (non-starters), which can be broken
+     *                           after but not before.
+     */
+    private static final boolean isIdeographic(char c, boolean includeNonStarters) {
+        if (c >= '\u2E80' && c <= '\u2FFF') {
+            return true; // CJK, KANGXI RADICALS, DESCRIPTION SYMBOLS
+        }
+        if (c == '\u3000') {
+            return true; // IDEOGRAPHIC SPACE
+        }
+        if (c >= '\u3040' && c <= '\u309F') {
+            if (!includeNonStarters) {
+                switch (c) {
+                case '\u3041': //  # HIRAGANA LETTER SMALL A
+                case '\u3043': //  # HIRAGANA LETTER SMALL I
+                case '\u3045': //  # HIRAGANA LETTER SMALL U
+                case '\u3047': //  # HIRAGANA LETTER SMALL E
+                case '\u3049': //  # HIRAGANA LETTER SMALL O
+                case '\u3063': //  # HIRAGANA LETTER SMALL TU
+                case '\u3083': //  # HIRAGANA LETTER SMALL YA
+                case '\u3085': //  # HIRAGANA LETTER SMALL YU
+                case '\u3087': //  # HIRAGANA LETTER SMALL YO
+                case '\u308E': //  # HIRAGANA LETTER SMALL WA
+                case '\u3095': //  # HIRAGANA LETTER SMALL KA
+                case '\u3096': //  # HIRAGANA LETTER SMALL KE
+                case '\u309B': //  # KATAKANA-HIRAGANA VOICED SOUND MARK
+                case '\u309C': //  # KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK
+                case '\u309D': //  # HIRAGANA ITERATION MARK
+                case '\u309E': //  # HIRAGANA VOICED ITERATION MARK
+                    return false;
+                }
+            }
+            return true; // Hiragana (except small characters)
+        }
+        if (c >= '\u30A0' && c <= '\u30FF') {
+            if (!includeNonStarters) {
+                switch (c) {
+                case '\u30A0': //  # KATAKANA-HIRAGANA DOUBLE HYPHEN
+                case '\u30A1': //  # KATAKANA LETTER SMALL A
+                case '\u30A3': //  # KATAKANA LETTER SMALL I
+                case '\u30A5': //  # KATAKANA LETTER SMALL U
+                case '\u30A7': //  # KATAKANA LETTER SMALL E
+                case '\u30A9': //  # KATAKANA LETTER SMALL O
+                case '\u30C3': //  # KATAKANA LETTER SMALL TU
+                case '\u30E3': //  # KATAKANA LETTER SMALL YA
+                case '\u30E5': //  # KATAKANA LETTER SMALL YU
+                case '\u30E7': //  # KATAKANA LETTER SMALL YO
+                case '\u30EE': //  # KATAKANA LETTER SMALL WA
+                case '\u30F5': //  # KATAKANA LETTER SMALL KA
+                case '\u30F6': //  # KATAKANA LETTER SMALL KE
+                case '\u30FB': //  # KATAKANA MIDDLE DOT
+                case '\u30FC': //  # KATAKANA-HIRAGANA PROLONGED SOUND MARK
+                case '\u30FD': //  # KATAKANA ITERATION MARK
+                case '\u30FE': //  # KATAKANA VOICED ITERATION MARK
+                    return false;
+                }
+            }
+            return true; // Katakana (except small characters)
+        }
+        if (c >= '\u3400' && c <= '\u4DB5') {
+            return true; // CJK UNIFIED IDEOGRAPHS EXTENSION A
+        }
+        if (c >= '\u4E00' && c <= '\u9FBB') {
+            return true; // CJK UNIFIED IDEOGRAPHS
+        }
+        if (c >= '\uF900' && c <= '\uFAD9') {
+            return true; // CJK COMPATIBILITY IDEOGRAPHS
+        }
+        if (c >= '\uA000' && c <= '\uA48F') {
+            return true; // YI SYLLABLES
+        }
+        if (c >= '\uA490' && c <= '\uA4CF') {
+            return true; // YI RADICALS
+        }
+        if (c >= '\uFE62' && c <= '\uFE66') {
+            return true; // SMALL PLUS SIGN to SMALL EQUALS SIGN
+        }
+        if (c >= '\uFF10' && c <= '\uFF19') {
+            return true; // WIDE DIGITS
+        }
+
+        return false;
+    }
+
     private int out(CharSequence text, int start, int end,
                       int above, int below, int top, int bottom, int v,
                       float spacingmult, float spacingadd,
@@ -840,11 +930,6 @@ public class StaticLayout extends Layout {
         mMeasured = MeasuredText.recycle(mMeasured);
     }
 
-    // returns an array with terminal sentinel value -1 to indicate end
-    // this is so that arrays can be recycled instead of allocating new arrays
-    // every time
-    private static native int[] nLineBreakOpportunities(String locale, char[] text, int length, int[] recycle);
-
     private int mLineCount;
     private int mTopPadding, mBottomPadding;
     private int mColumns;
@@ -870,9 +955,13 @@ public class StaticLayout extends Layout {
 
     private static final int TAB_INCREMENT = 20; // same as Layout, but that's private
 
+    private static final char CHAR_FIRST_CJK = '\u2E80';
+
     private static final char CHAR_NEW_LINE = '\n';
     private static final char CHAR_TAB = '\t';
     private static final char CHAR_SPACE = ' ';
+    private static final char CHAR_SLASH = '/';
+    private static final char CHAR_HYPHEN = '-';
     private static final char CHAR_ZWSP = '\u200B';
 
     private static final double EXTRA_ROUNDING = 0.5;
diff --git a/core/jni/Android.mk b/core/jni/Android.mk
index 01517b2..2e0acb1 100644
--- a/core/jni/Android.mk
+++ b/core/jni/Android.mk
@@ -62,7 +62,6 @@ LOCAL_SRC_FILES:= \
 	android_view_VelocityTracker.cpp \
 	android_text_AndroidCharacter.cpp \
 	android_text_AndroidBidi.cpp \
-	android_text_StaticLayout.cpp \
 	android_os_Debug.cpp \
 	android_os_MemoryFile.cpp \
 	android_os_MessageQueue.cpp \
diff --git a/core/jni/AndroidRuntime.cpp b/core/jni/AndroidRuntime.cpp
index ead3cbe..b4599b6 100644
--- a/core/jni/AndroidRuntime.cpp
+++ b/core/jni/AndroidRuntime.cpp
@@ -149,7 +149,6 @@ extern int register_android_net_NetworkUtils(JNIEnv* env);
 extern int register_android_net_TrafficStats(JNIEnv* env);
 extern int register_android_net_wifi_WifiNative(JNIEnv* env);
 extern int register_android_text_AndroidCharacter(JNIEnv *env);
-extern int register_android_text_StaticLayout(JNIEnv *env);
 extern int register_android_text_AndroidBidi(JNIEnv *env);
 extern int register_android_opengl_classes(JNIEnv *env);
 extern int register_android_server_NetworkManagementSocketTagger(JNIEnv* env);
@@ -1106,7 +1105,6 @@ static const RegJNIRec gRegJNI[] = {
     REG_JNI(register_android_content_XmlBlock),
     REG_JNI(register_android_emoji_EmojiFactory),
     REG_JNI(register_android_text_AndroidCharacter),
-    REG_JNI(register_android_text_StaticLayout),
     REG_JNI(register_android_text_AndroidBidi),
     REG_JNI(register_android_view_InputDevice),
     REG_JNI(register_android_view_KeyCharacterMap),
diff --git a/core/jni/android_text_StaticLayout.cpp b/core/jni/android_text_StaticLayout.cpp
deleted file mode 100644
index 696926c..0000000
--- a/core/jni/android_text_StaticLayout.cpp
+++ /dev/null
@@ -1,110 +0,0 @@
-/*
- * Copyright (C) 2014 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.
- */
-
-#define LOG_TAG "StaticLayout"
-
-#include "ScopedIcuLocale.h"
-#include "unicode/locid.h"
-#include "unicode/brkiter.h"
-#include "utils/misc.h"
-#include "utils/Log.h"
-#include "ScopedPrimitiveArray.h"
-#include "JNIHelp.h"
-#include <android_runtime/AndroidRuntime.h>
-#include <vector>
-
-namespace android {
-
-class ScopedBreakIterator {
-    public:
-        ScopedBreakIterator(JNIEnv* env, BreakIterator* breakIterator, jcharArray inputText,
-                            jint length) : mBreakIterator(breakIterator), mChars(env, inputText) {
-            UErrorCode status = U_ZERO_ERROR;
-            mUText = utext_openUChars(NULL, mChars.get(), length, &status);
-            if (mUText == NULL) {
-                return;
-            }
-
-            mBreakIterator->setText(mUText, status);
-        }
-
-        inline BreakIterator* operator->() {
-            return mBreakIterator;
-        }
-
-        ~ScopedBreakIterator() {
-            utext_close(mUText);
-            delete mBreakIterator;
-        }
-    private:
-        BreakIterator* mBreakIterator;
-        ScopedCharArrayRO mChars;
-        UText* mUText;
-
-        // disable copying and assignment
-        ScopedBreakIterator(const ScopedBreakIterator&);
-        void operator=(const ScopedBreakIterator&);
-};
-
-static jintArray nLineBreakOpportunities(JNIEnv* env, jclass, jstring javaLocaleName,
-                                        jcharArray inputText, jint length,
-                                        jintArray recycle) {
-    jintArray ret;
-    std::vector<jint> breaks(16);
-
-    ScopedIcuLocale icuLocale(env, javaLocaleName);
-    if (icuLocale.valid()) {
-        UErrorCode status = U_ZERO_ERROR;
-        BreakIterator* it = BreakIterator::createLineInstance(icuLocale.locale(), status);
-        if (!U_SUCCESS(status) || it == NULL) {
-            if (it) {
-                delete it;
-            }
-        } else {
-            ScopedBreakIterator breakIterator(env, it, inputText, length);
-            for (int loc = breakIterator->first(); loc != BreakIterator::DONE;
-                    loc = breakIterator->next()) {
-                breaks.push_back(loc);
-            }
-        }
-    }
-
-    breaks.push_back(-1); // sentinel terminal value
-
-    if (recycle != NULL && env->GetArrayLength(recycle) >= breaks.size()) {
-        ret = recycle;
-    } else {
-        ret = env->NewIntArray(breaks.size());
-    }
-
-    if (ret != NULL) {
-        env->SetIntArrayRegion(ret, 0, breaks.size(), &breaks.front());
-    }
-
-    return ret;
-}
-
-static JNINativeMethod gMethods[] = {
-    {"nLineBreakOpportunities", "(Ljava/lang/String;[CI[I)[I", (void*) nLineBreakOpportunities}
-};
-
-int register_android_text_StaticLayout(JNIEnv* env)
-{
-    return AndroidRuntime::registerNativeMethods(env, "android/text/StaticLayout",
-            gMethods, NELEM(gMethods));
-}
-
-}