1 /*
2 * Copyright (C) 2011 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 #include "jni/jni_native_buffer.h"
18 #include "jni/jni_util.h"
19
GetJBufferData(JNIEnv * env,jobject buffer,int * size)20 char* GetJBufferData(JNIEnv* env, jobject buffer, int* size) {
21 jclass base_class = env->FindClass("android/filterfw/core/NativeBuffer");
22
23 // Get fields
24 jfieldID ptr_field = env->GetFieldID(base_class, "mDataPointer", "J");
25 jfieldID size_field = env->GetFieldID(base_class, "mSize", "I");
26
27 // Get their values
28 char* data = reinterpret_cast<char*>(env->GetLongField(buffer, ptr_field));
29 if (size) {
30 *size = env->GetIntField(buffer, size_field);
31 }
32
33 // Clean-up
34 env->DeleteLocalRef(base_class);
35
36 return data;
37 }
38
AttachDataToJBuffer(JNIEnv * env,jobject buffer,char * data,int size)39 bool AttachDataToJBuffer(JNIEnv* env, jobject buffer, char* data, int size) {
40 jclass base_class = env->FindClass("android/filterfw/core/NativeBuffer");
41
42 // Get fields
43 jfieldID ptr_field = env->GetFieldID(base_class, "mDataPointer", "J");
44 jfieldID size_field = env->GetFieldID(base_class, "mSize", "I");
45
46 // Set their values
47 env->SetLongField(buffer, ptr_field, reinterpret_cast<jlong>(data));
48 env->SetIntField(buffer, size_field, size);
49
50 return true;
51 }
52
Java_android_filterfw_core_NativeBuffer_allocate(JNIEnv * env,jobject thiz,jint size)53 jboolean Java_android_filterfw_core_NativeBuffer_allocate(JNIEnv* env, jobject thiz, jint size) {
54 char* data = new char[size];
55 return ToJBool(AttachDataToJBuffer(env, thiz, data, size));
56 }
57
Java_android_filterfw_core_NativeBuffer_deallocate(JNIEnv * env,jobject thiz,jboolean owns_data)58 jboolean Java_android_filterfw_core_NativeBuffer_deallocate(JNIEnv* env,
59 jobject thiz,
60 jboolean owns_data) {
61 if (ToCppBool(owns_data)) {
62 char* data = GetJBufferData(env, thiz, NULL);
63 delete[] data;
64 }
65 return JNI_TRUE;
66 }
67
Java_android_filterfw_core_NativeBuffer_nativeCopyTo(JNIEnv * env,jobject thiz,jobject new_buffer)68 jboolean Java_android_filterfw_core_NativeBuffer_nativeCopyTo(JNIEnv* env,
69 jobject thiz,
70 jobject new_buffer) {
71 // Get source buffer
72 int size;
73 char* source_data = GetJBufferData(env, thiz, &size);
74
75 // Make copy
76 char* target_data = new char[size];
77 memcpy(target_data, source_data, size);
78
79 // Attach it to new buffer
80 AttachDataToJBuffer(env, new_buffer, target_data, size);
81
82 return JNI_TRUE;
83 }
84
85