Igor Murashkin | 7072550 | 2013-06-25 20:27:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | ** |
| 3 | ** Copyright 2013, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | // #define LOG_NDEBUG 0 |
| 19 | #define LOG_TAG "CameraMetadata-JNI" |
| 20 | #include <utils/Log.h> |
| 21 | |
| 22 | #include "jni.h" |
| 23 | #include "JNIHelp.h" |
| 24 | #include "android_os_Parcel.h" |
| 25 | #include "android_runtime/AndroidRuntime.h" |
| 26 | |
| 27 | #include <camera/CameraMetadata.h> |
| 28 | |
| 29 | // fully-qualified class name |
| 30 | #define CAMERA_METADATA_CLASS_NAME "android/hardware/photography/CameraMetadata" |
| 31 | |
| 32 | using namespace android; |
| 33 | |
| 34 | struct fields_t { |
| 35 | jfieldID metadata_ptr; |
| 36 | }; |
| 37 | |
| 38 | static fields_t fields; |
| 39 | |
| 40 | extern "C" { |
| 41 | |
| 42 | static void CameraMetadata_classInit(JNIEnv *env, jobject thiz); |
| 43 | |
| 44 | // Less safe access to native pointer. Does NOT throw any Java exceptions if NULL. |
| 45 | static CameraMetadata* CameraMetadata_getPointerNoThrow(JNIEnv *env, jobject thiz) { |
| 46 | |
| 47 | if (thiz == NULL) { |
| 48 | return NULL; |
| 49 | } |
| 50 | |
| 51 | return reinterpret_cast<CameraMetadata*>(env->GetLongField(thiz, fields.metadata_ptr)); |
| 52 | } |
| 53 | |
| 54 | // Safe access to native pointer from object. Throws if not possible to access. |
| 55 | static CameraMetadata* CameraMetadata_getPointerThrow(JNIEnv *env, jobject thiz, |
| 56 | const char* argName = "this") { |
| 57 | |
| 58 | if (thiz == NULL) { |
| 59 | ALOGV("%s: Throwing java.lang.NullPointerException for null reference", |
| 60 | __FUNCTION__); |
| 61 | jniThrowNullPointerException(env, argName); |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | CameraMetadata* metadata = CameraMetadata_getPointerNoThrow(env, thiz); |
| 66 | if (metadata == NULL) { |
| 67 | ALOGV("%s: Throwing java.lang.IllegalStateException for closed object", |
| 68 | __FUNCTION__); |
| 69 | jniThrowException(env, "java/lang/IllegalStateException", |
| 70 | "Metadata object was already closed"); |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | return metadata; |
| 75 | } |
| 76 | |
| 77 | static jlong CameraMetadata_allocate(JNIEnv *env, jobject thiz) { |
| 78 | ALOGV("%s", __FUNCTION__); |
| 79 | |
| 80 | return reinterpret_cast<jlong>(new CameraMetadata()); |
| 81 | } |
| 82 | |
| 83 | static jboolean CameraMetadata_isEmpty(JNIEnv *env, jobject thiz) { |
| 84 | ALOGV("%s", __FUNCTION__); |
| 85 | |
| 86 | CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| 87 | |
| 88 | if (metadata == NULL) { |
| 89 | ALOGW("%s: Returning early due to exception being thrown", |
| 90 | __FUNCTION__); |
| 91 | return JNI_TRUE; // actually throws java exc. |
| 92 | } |
| 93 | |
| 94 | jboolean empty = metadata->isEmpty(); |
| 95 | |
| 96 | ALOGV("%s: Empty returned %d, entry count was %d", |
| 97 | __FUNCTION__, empty, metadata->entryCount()); |
| 98 | |
| 99 | return empty; |
| 100 | } |
| 101 | |
| 102 | static jint CameraMetadata_getEntryCount(JNIEnv *env, jobject thiz) { |
| 103 | ALOGV("%s", __FUNCTION__); |
| 104 | |
| 105 | CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| 106 | |
| 107 | if (metadata == NULL) return 0; // actually throws java exc. |
| 108 | |
| 109 | return metadata->entryCount(); |
| 110 | } |
| 111 | |
| 112 | // idempotent. calling more than once has no effect. |
| 113 | static void CameraMetadata_close(JNIEnv *env, jobject thiz) { |
| 114 | ALOGV("%s", __FUNCTION__); |
| 115 | |
| 116 | CameraMetadata* metadata = CameraMetadata_getPointerNoThrow(env, thiz); |
| 117 | |
| 118 | if (metadata != NULL) { |
| 119 | delete metadata; |
| 120 | env->SetLongField(thiz, fields.metadata_ptr, 0); |
| 121 | } |
| 122 | |
| 123 | LOG_ALWAYS_FATAL_IF(CameraMetadata_getPointerNoThrow(env, thiz) != NULL, |
| 124 | "Expected the native ptr to be 0 after #close"); |
| 125 | } |
| 126 | |
| 127 | static void CameraMetadata_swap(JNIEnv *env, jobject thiz, jobject other) { |
| 128 | ALOGV("%s", __FUNCTION__); |
| 129 | |
| 130 | CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| 131 | |
| 132 | // order is important: we can't call another JNI method |
| 133 | // if there is an exception pending |
| 134 | if (metadata == NULL) return; |
| 135 | |
| 136 | CameraMetadata* otherMetadata = CameraMetadata_getPointerThrow(env, other, "other"); |
| 137 | |
| 138 | if (otherMetadata == NULL) return; |
| 139 | |
| 140 | metadata->swap(*otherMetadata); |
| 141 | } |
| 142 | |
| 143 | static void CameraMetadata_readFromParcel(JNIEnv *env, jobject thiz, jobject parcel) { |
| 144 | ALOGV("%s", __FUNCTION__); |
| 145 | CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| 146 | if (metadata == NULL) { |
| 147 | return; |
| 148 | } |
| 149 | |
| 150 | Parcel* parcelNative = parcelForJavaObject(env, parcel); |
| 151 | if (parcelNative == NULL) { |
| 152 | jniThrowNullPointerException(env, "parcel"); |
| 153 | return; |
| 154 | } |
| 155 | |
| 156 | status_t err; |
| 157 | if ((err = metadata->readFromParcel(parcelNative)) != OK) { |
| 158 | jniThrowExceptionFmt(env, "java/lang/IllegalStateException", |
| 159 | "Failed to read from parcel (error code %d)", err); |
| 160 | return; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | static void CameraMetadata_writeToParcel(JNIEnv *env, jobject thiz, jobject parcel) { |
| 165 | ALOGV("%s", __FUNCTION__); |
| 166 | CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz); |
| 167 | if (metadata == NULL) { |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | Parcel* parcelNative = parcelForJavaObject(env, parcel); |
| 172 | if (parcelNative == NULL) { |
| 173 | jniThrowNullPointerException(env, "parcel"); |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | status_t err; |
| 178 | if ((err = metadata->writeToParcel(parcelNative)) != OK) { |
| 179 | jniThrowExceptionFmt(env, "java/lang/IllegalStateException", |
| 180 | "Failed to write to parcel (error code %d)", err); |
| 181 | return; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | } // extern "C" |
| 186 | |
| 187 | //------------------------------------------------- |
| 188 | |
| 189 | static JNINativeMethod gCameraMetadataMethods[] = { |
| 190 | { "nativeClassInit", |
| 191 | "()V", |
| 192 | (void *)CameraMetadata_classInit }, |
| 193 | { "nativeAllocate", |
| 194 | "()J", |
| 195 | (void*)CameraMetadata_allocate }, |
| 196 | { "nativeIsEmpty", |
| 197 | "()Z", |
| 198 | (void*)CameraMetadata_isEmpty }, |
| 199 | { "nativeGetEntryCount", |
| 200 | "()I", |
| 201 | (void*)CameraMetadata_getEntryCount }, |
| 202 | { "nativeClose", |
| 203 | "()V", |
| 204 | (void*)CameraMetadata_close }, |
| 205 | { "nativeSwap", |
| 206 | "(L" CAMERA_METADATA_CLASS_NAME ";)V", |
| 207 | (void *)CameraMetadata_swap }, |
| 208 | { "nativeReadFromParcel", |
| 209 | "(Landroid/os/Parcel;)V", |
| 210 | (void *)CameraMetadata_readFromParcel }, |
| 211 | { "nativeWriteToParcel", |
| 212 | "(Landroid/os/Parcel;)V", |
| 213 | (void *)CameraMetadata_writeToParcel }, |
| 214 | }; |
| 215 | |
| 216 | struct field { |
| 217 | const char *class_name; |
| 218 | const char *field_name; |
| 219 | const char *field_type; |
| 220 | jfieldID *jfield; |
| 221 | }; |
| 222 | |
| 223 | static int find_fields(JNIEnv *env, field *fields, int count) |
| 224 | { |
| 225 | for (int i = 0; i < count; i++) { |
| 226 | field *f = &fields[i]; |
| 227 | jclass clazz = env->FindClass(f->class_name); |
| 228 | if (clazz == NULL) { |
| 229 | ALOGE("Can't find %s", f->class_name); |
| 230 | return -1; |
| 231 | } |
| 232 | |
| 233 | jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type); |
| 234 | if (field == NULL) { |
| 235 | ALOGE("Can't find %s.%s", f->class_name, f->field_name); |
| 236 | return -1; |
| 237 | } |
| 238 | |
| 239 | *(f->jfield) = field; |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | // Get all the required offsets in java class and register native functions |
| 246 | int register_android_hardware_photography_CameraMetadata(JNIEnv *env) |
| 247 | { |
| 248 | // Register native functions |
| 249 | return AndroidRuntime::registerNativeMethods(env, |
| 250 | CAMERA_METADATA_CLASS_NAME, |
| 251 | gCameraMetadataMethods, |
| 252 | NELEM(gCameraMetadataMethods)); |
| 253 | } |
| 254 | |
| 255 | extern "C" { |
| 256 | static void CameraMetadata_classInit(JNIEnv *env, jobject thiz) { |
| 257 | // XX: Why do this separately instead of doing it in the register function? |
| 258 | ALOGV("%s", __FUNCTION__); |
| 259 | |
| 260 | field fields_to_find[] = { |
| 261 | { CAMERA_METADATA_CLASS_NAME, "mMetadataPtr", "J", &fields.metadata_ptr }, |
| 262 | }; |
| 263 | |
| 264 | // Do this here instead of in register_native_methods, |
| 265 | // since otherwise it will fail to find the fields. |
| 266 | if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0) |
| 267 | return; |
| 268 | |
| 269 | jclass clazz = env->FindClass(CAMERA_METADATA_CLASS_NAME); |
| 270 | } |
| 271 | } // extern "C" |