Implement line breaking using ICU break iterator
Change-Id: I4ad98757aa2eab5dbc2ae44c0391e900ef20c4d0
diff --git a/core/jni/android_text_StaticLayout.cpp b/core/jni/android_text_StaticLayout.cpp
new file mode 100644
index 0000000..696926c
--- /dev/null
+++ b/core/jni/android_text_StaticLayout.cpp
@@ -0,0 +1,110 @@
+/*
+ * 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));
+}
+
+}