| /* |
| ** |
| ** Copyright 2013, 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_NDEBUG 0 |
| #define LOG_TAG "CameraMetadata-JNI" |
| #include <utils/Log.h> |
| |
| #include "jni.h" |
| #include "JNIHelp.h" |
| #include "android_os_Parcel.h" |
| #include "android_runtime/AndroidRuntime.h" |
| |
| #include <camera/CameraMetadata.h> |
| |
| // fully-qualified class name |
| #define CAMERA_METADATA_CLASS_NAME "android/hardware/photography/CameraMetadata" |
| |
| using namespace android; |
| |
| struct fields_t { |
| jfieldID metadata_ptr; |
| }; |
| |
| static fields_t fields; |
| |
| extern "C" { |
| |
| static void CameraMetadata_classInit(JNIEnv *env, jobject thiz); |
| |
| // Less safe access to native pointer. Does NOT throw any Java exceptions if NULL. |
| static CameraMetadata* CameraMetadata_getPointerNoThrow(JNIEnv *env, jobject thiz) { |
| |
| if (thiz == NULL) { |
| return NULL; |
| } |
| |
| return reinterpret_cast<CameraMetadata*>(env->GetLongField(thiz, fields.metadata_ptr)); |
| } |
| |
| // Safe access to native pointer from object. Throws if not possible to access. |
| static CameraMetadata* CameraMetadata_getPointerThrow(JNIEnv *env, jobject thiz, |
| const char* argName = "this") { |
| |
| if (thiz == NULL) { |
| ALOGV("%s: Throwing java.lang.NullPointerException for null reference", |
| __FUNCTION__); |
| jniThrowNullPointerException(env, argName); |
| return NULL; |
| } |
| |
| CameraMetadata* metadata = CameraMetadata_getPointerNoThrow(env, thiz); |
| if (metadata == NULL) { |
| ALOGV("%s: Throwing java.lang.IllegalStateException for closed object", |
| __FUNCTION__); |
| jniThrowException(env, "java/lang/IllegalStateException", |
| "Metadata object was already closed"); |
| return NULL; |
| } |
| |
| return metadata; |
| } |
| |
| static jlong CameraMetadata_allocate(JNIEnv *env, jobject thiz) { |
| ALOGV("%s", __FUNCTION__); |
| |
| return reinterpret_cast<jlong>(new CameraMetadata()); |
| } |
| |
| static jboolean CameraMetadata_isEmpty(JNIEnv *env, jobject thiz) { |
| ALOGV("%s", __FUNCTION__); |
| |
| CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| |
| if (metadata == NULL) { |
| ALOGW("%s: Returning early due to exception being thrown", |
| __FUNCTION__); |
| return JNI_TRUE; // actually throws java exc. |
| } |
| |
| jboolean empty = metadata->isEmpty(); |
| |
| ALOGV("%s: Empty returned %d, entry count was %d", |
| __FUNCTION__, empty, metadata->entryCount()); |
| |
| return empty; |
| } |
| |
| static jint CameraMetadata_getEntryCount(JNIEnv *env, jobject thiz) { |
| ALOGV("%s", __FUNCTION__); |
| |
| CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| |
| if (metadata == NULL) return 0; // actually throws java exc. |
| |
| return metadata->entryCount(); |
| } |
| |
| // idempotent. calling more than once has no effect. |
| static void CameraMetadata_close(JNIEnv *env, jobject thiz) { |
| ALOGV("%s", __FUNCTION__); |
| |
| CameraMetadata* metadata = CameraMetadata_getPointerNoThrow(env, thiz); |
| |
| if (metadata != NULL) { |
| delete metadata; |
| env->SetLongField(thiz, fields.metadata_ptr, 0); |
| } |
| |
| LOG_ALWAYS_FATAL_IF(CameraMetadata_getPointerNoThrow(env, thiz) != NULL, |
| "Expected the native ptr to be 0 after #close"); |
| } |
| |
| static void CameraMetadata_swap(JNIEnv *env, jobject thiz, jobject other) { |
| ALOGV("%s", __FUNCTION__); |
| |
| CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| |
| // order is important: we can't call another JNI method |
| // if there is an exception pending |
| if (metadata == NULL) return; |
| |
| CameraMetadata* otherMetadata = CameraMetadata_getPointerThrow(env, other, "other"); |
| |
| if (otherMetadata == NULL) return; |
| |
| metadata->swap(*otherMetadata); |
| } |
| |
| static void CameraMetadata_readFromParcel(JNIEnv *env, jobject thiz, jobject parcel) { |
| ALOGV("%s", __FUNCTION__); |
| CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| if (metadata == NULL) { |
| return; |
| } |
| |
| Parcel* parcelNative = parcelForJavaObject(env, parcel); |
| if (parcelNative == NULL) { |
| jniThrowNullPointerException(env, "parcel"); |
| return; |
| } |
| |
| status_t err; |
| if ((err = metadata->readFromParcel(parcelNative)) != OK) { |
| jniThrowExceptionFmt(env, "java/lang/IllegalStateException", |
| "Failed to read from parcel (error code %d)", err); |
| return; |
| } |
| } |
| |
| static void CameraMetadata_writeToParcel(JNIEnv *env, jobject thiz, jobject parcel) { |
| ALOGV("%s", __FUNCTION__); |
| CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| if (metadata == NULL) { |
| return; |
| } |
| |
| Parcel* parcelNative = parcelForJavaObject(env, parcel); |
| if (parcelNative == NULL) { |
| jniThrowNullPointerException(env, "parcel"); |
| return; |
| } |
| |
| status_t err; |
| if ((err = metadata->writeToParcel(parcelNative)) != OK) { |
| jniThrowExceptionFmt(env, "java/lang/IllegalStateException", |
| "Failed to write to parcel (error code %d)", err); |
| return; |
| } |
| } |
| |
| } // extern "C" |
| |
| //------------------------------------------------- |
| |
| static JNINativeMethod gCameraMetadataMethods[] = { |
| { "nativeClassInit", |
| "()V", |
| (void *)CameraMetadata_classInit }, |
| { "nativeAllocate", |
| "()J", |
| (void*)CameraMetadata_allocate }, |
| { "nativeIsEmpty", |
| "()Z", |
| (void*)CameraMetadata_isEmpty }, |
| { "nativeGetEntryCount", |
| "()I", |
| (void*)CameraMetadata_getEntryCount }, |
| { "nativeClose", |
| "()V", |
| (void*)CameraMetadata_close }, |
| { "nativeSwap", |
| "(L" CAMERA_METADATA_CLASS_NAME ";)V", |
| (void *)CameraMetadata_swap }, |
| { "nativeReadFromParcel", |
| "(Landroid/os/Parcel;)V", |
| (void *)CameraMetadata_readFromParcel }, |
| { "nativeWriteToParcel", |
| "(Landroid/os/Parcel;)V", |
| (void *)CameraMetadata_writeToParcel }, |
| }; |
| |
| struct field { |
| const char *class_name; |
| const char *field_name; |
| const char *field_type; |
| jfieldID *jfield; |
| }; |
| |
| static int find_fields(JNIEnv *env, field *fields, int count) |
| { |
| for (int i = 0; i < count; i++) { |
| field *f = &fields[i]; |
| jclass clazz = env->FindClass(f->class_name); |
| if (clazz == NULL) { |
| ALOGE("Can't find %s", f->class_name); |
| return -1; |
| } |
| |
| jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type); |
| if (field == NULL) { |
| ALOGE("Can't find %s.%s", f->class_name, f->field_name); |
| return -1; |
| } |
| |
| *(f->jfield) = field; |
| } |
| |
| return 0; |
| } |
| |
| // Get all the required offsets in java class and register native functions |
| int register_android_hardware_photography_CameraMetadata(JNIEnv *env) |
| { |
| // Register native functions |
| return AndroidRuntime::registerNativeMethods(env, |
| CAMERA_METADATA_CLASS_NAME, |
| gCameraMetadataMethods, |
| NELEM(gCameraMetadataMethods)); |
| } |
| |
| extern "C" { |
| static void CameraMetadata_classInit(JNIEnv *env, jobject thiz) { |
| // XX: Why do this separately instead of doing it in the register function? |
| ALOGV("%s", __FUNCTION__); |
| |
| field fields_to_find[] = { |
| { CAMERA_METADATA_CLASS_NAME, "mMetadataPtr", "J", &fields.metadata_ptr }, |
| }; |
| |
| // Do this here instead of in register_native_methods, |
| // since otherwise it will fail to find the fields. |
| if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0) |
| return; |
| |
| jclass clazz = env->FindClass(CAMERA_METADATA_CLASS_NAME); |
| } |
| } // extern "C" |