android_text_StaticLayout.cpp revision 9b727000360c3cc103a36d4eb1f3b15e0ed8eae8 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "StaticLayout"
18
19#include "ScopedIcuLocale.h"
20#include "unicode/locid.h"
21#include "unicode/brkiter.h"
22#include "utils/misc.h"
23#include "utils/Log.h"
24#include "ScopedPrimitiveArray.h"
25#include "JNIHelp.h"
26#include <android_runtime/AndroidRuntime.h>
27#include <vector>
28
29namespace android {
30
31class ScopedBreakIterator {
32    public:
33        ScopedBreakIterator(JNIEnv* env, BreakIterator* breakIterator, jcharArray inputText,
34                            jint length) : mBreakIterator(breakIterator), mChars(env, inputText) {
35            UErrorCode status = U_ZERO_ERROR;
36            mUText = utext_openUChars(NULL, mChars.get(), length, &status);
37            if (mUText == NULL) {
38                return;
39            }
40
41            mBreakIterator->setText(mUText, status);
42        }
43
44        inline BreakIterator* operator->() {
45            return mBreakIterator;
46        }
47
48        ~ScopedBreakIterator() {
49            utext_close(mUText);
50            delete mBreakIterator;
51        }
52    private:
53        BreakIterator* mBreakIterator;
54        ScopedCharArrayRO mChars;
55        UText* mUText;
56
57        // disable copying and assignment
58        ScopedBreakIterator(const ScopedBreakIterator&);
59        void operator=(const ScopedBreakIterator&);
60};
61
62static jintArray nLineBreakOpportunities(JNIEnv* env, jclass, jstring javaLocaleName,
63                                        jcharArray inputText, jint length,
64                                        jintArray recycle) {
65    jintArray ret;
66    std::vector<jint> breaks;
67
68    ScopedIcuLocale icuLocale(env, javaLocaleName);
69    if (icuLocale.valid()) {
70        UErrorCode status = U_ZERO_ERROR;
71        BreakIterator* it = BreakIterator::createLineInstance(icuLocale.locale(), status);
72        if (!U_SUCCESS(status) || it == NULL) {
73            if (it) {
74                delete it;
75            }
76        } else {
77            ScopedBreakIterator breakIterator(env, it, inputText, length);
78            for (int loc = breakIterator->first(); loc != BreakIterator::DONE;
79                    loc = breakIterator->next()) {
80                breaks.push_back(loc);
81            }
82        }
83    }
84
85    breaks.push_back(-1); // sentinel terminal value
86
87    if (recycle != NULL && static_cast<size_t>(env->GetArrayLength(recycle)) >= breaks.size()) {
88        ret = recycle;
89    } else {
90        ret = env->NewIntArray(breaks.size());
91    }
92
93    if (ret != NULL) {
94        env->SetIntArrayRegion(ret, 0, breaks.size(), &breaks.front());
95    }
96
97    return ret;
98}
99
100static JNINativeMethod gMethods[] = {
101    {"nLineBreakOpportunities", "(Ljava/lang/String;[CI[I)[I", (void*) nLineBreakOpportunities}
102};
103
104int register_android_text_StaticLayout(JNIEnv* env)
105{
106    return AndroidRuntime::registerNativeMethods(env, "android/text/StaticLayout",
107            gMethods, NELEM(gMethods));
108}
109
110}
111