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 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 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 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 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 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
