1 /*
2 * Copyright (C) 2023 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 #undef LOG_TAG
18 #define LOG_TAG "GraphemeBreaker"
19
20 #include <minikin/GraphemeBreak.h>
21 #include <nativehelper/ScopedPrimitiveArray.h>
22
23 #include "GraphicsJNI.h"
24
25 namespace android {
26
nIsGraphemeBreak(JNIEnv * env,jclass,jfloatArray advances,jcharArray text,jint start,jint end,jbooleanArray isGraphemeBreak)27 static void nIsGraphemeBreak(JNIEnv* env, jclass, jfloatArray advances, jcharArray text, jint start,
28 jint end, jbooleanArray isGraphemeBreak) {
29 if (start > end || env->GetArrayLength(advances) < end ||
30 env->GetArrayLength(isGraphemeBreak) < end - start) {
31 doThrowAIOOBE(env);
32 }
33
34 if (start == end) {
35 return;
36 }
37
38 ScopedFloatArrayRO advancesArray(env, advances);
39 ScopedCharArrayRO textArray(env, text);
40 ScopedBooleanArrayRW isGraphemeBreakArray(env, isGraphemeBreak);
41
42 size_t count = end - start;
43 for (size_t offset = 0; offset < count; ++offset) {
44 bool isBreak = minikin::GraphemeBreak::isGraphemeBreak(advancesArray.get(), textArray.get(),
45 start, end, start + offset);
46 isGraphemeBreakArray[offset] = isBreak ? JNI_TRUE : JNI_FALSE;
47 }
48 }
49
50 static const JNINativeMethod gMethods[] = {
51 {"nIsGraphemeBreak",
52 "("
53 "[F" // advances
54 "[C" // text
55 "I" // start
56 "I" // end
57 "[Z" // isGraphemeBreak
58 ")V",
59 (void*)nIsGraphemeBreak},
60 };
61
register_android_graphics_text_GraphemeBreak(JNIEnv * env)62 int register_android_graphics_text_GraphemeBreak(JNIEnv* env) {
63 return RegisterMethodsOrDie(env, "android/graphics/text/GraphemeBreak", gMethods,
64 NELEM(gMethods));
65 }
66
67 } // namespace android
68