Buffer Class¶
Description¶
Buffer 存储了原始字节数组，可以用来访问图像数据。
在Java API中可以从 Image 中获取buffer然后copy数据到Java字节数组。
在EasyAR Sense的所有版本中，你都可以访问图像数据。参考 Image 。
wrap¶
包装一个指定长度的原始内存块。在Buffer被完全释放的时候，会调用deleter回调，执行用户自定义内存销毁行为。deleter必须是线程安全的。
- C
void easyar_Buffer_wrap(void * ptr, int size, easyar_FunctorOfVoid deleter, easyar_Buffer * * Return)
- C++17
static std::shared_ptr<Buffer> wrap(void * ptr, int size, std::function<void()> deleter)
- C++03(Deprecated)
static void wrap(void * ptr, int size, FunctorOfVoid deleter, Buffer * * Return)
- Java
public static @Nonnull Buffer wrap(long ptr, int size, @Nonnull FunctorOfVoid deleter)
- Kotlin
companion object fun wrap(ptr: Long, size: Int, deleter: FunctorOfVoid): Buffer
- Objective-C
+ (easyar_Buffer *)wrap:(void *)ptr size:(int)size deleter:(void (^)())deleter
- Swift
public static func wrap(_ ptr: OpaquePointer?, _ size: Int32, _ deleter: @escaping () -> Void) -> Buffer
- C#
public static Buffer wrap(IntPtr ptr, int size, Action deleter)
create¶
创建一个指定字节长度的Buffer。
- C
void easyar_Buffer_create(int size, easyar_Buffer * * Return)
- C++17
static std::shared_ptr<Buffer> create(int size)
- C++03(Deprecated)
static void create(int size, Buffer * * Return)
- Java
public static @Nonnull Buffer create(int size)
- Kotlin
companion object fun create(size: Int): Buffer
- Objective-C
+ (easyar_Buffer *)create:(int)size
- Swift
public static func create(_ size: Int32) -> Buffer
- C#
public static Buffer create(int size)
data¶
返回原始内存地址。
- C
void * easyar_Buffer_data(const easyar_Buffer * This)
- C++17
void * data()
- C++03(Deprecated)
void * data()
- Java
public long data()
- Kotlin
fun data(): Long
- Objective-C
- (void *)data
- Swift
public func data() -> OpaquePointer?
- C#
public virtual IntPtr data()
size¶
Buffer的字节长度。
- C
int easyar_Buffer_size(const easyar_Buffer * This)
- C++17
int size()
- C++03(Deprecated)
int size()
- Java
public int size()
- Kotlin
fun size(): Int
- Objective-C
- (int)size
- Swift
public func size() -> Int32
- C#
public virtual int size()
memoryCopy¶
复制原始内存。主要用于内存操作不完善的语言或环境。
- C
void easyar_Buffer_memoryCopy(void * src, void * dest, int length)
- C++17
static void memoryCopy(void * src, void * dest, int length)
- C++03(Deprecated)
static void memoryCopy(void * src, void * dest, int length)
- Java
public static void memoryCopy(long src, long dest, int length)
- Kotlin
companion object fun memoryCopy(src: Long, dest: Long, length: Int): Unit
- Objective-C
+ (void)memoryCopy:(void *)src dest:(void *)dest length:(int)length
- Swift
public static func memoryCopy(_ src: OpaquePointer?, _ dest: OpaquePointer?, _ length: Int32) -> Void
- C#
public static void memoryCopy(IntPtr src, IntPtr dest, int length)
tryCopyFrom¶
尝试从原始内存地址复制数据到Buffer中。如果复制成功，则返回true，否则返回false。失败的原因有：源数据范围或目标数据范围超出可用范围。
- C
bool easyar_Buffer_tryCopyFrom(easyar_Buffer * This, void * src, int srcIndex, int index, int length)
- C++17
bool tryCopyFrom(void * src, int srcIndex, int index, int length)
- C++03(Deprecated)
bool tryCopyFrom(void * src, int srcIndex, int index, int length)
- Java
public boolean tryCopyFrom(long src, int srcIndex, int index, int length)
- Kotlin
fun tryCopyFrom(src: Long, srcIndex: Int, index: Int, length: Int): Boolean
- Objective-C
- (bool)tryCopyFrom:(void *)src srcIndex:(int)srcIndex index:(int)index length:(int)length
- Swift
public func tryCopyFrom(_ src: OpaquePointer?, _ srcIndex: Int32, _ index: Int32, _ length: Int32) -> Bool
- C#
public virtual bool tryCopyFrom(IntPtr src, int srcIndex, int index, int length)
tryCopyTo¶
尝试从Buffer复制数据到原始内存地址中。如果复制成功，则返回true，否则返回false。失败的原因有：源数据范围或目标数据范围超出可用范围。
- C
bool easyar_Buffer_tryCopyTo(easyar_Buffer * This, int index, void * dest, int destIndex, int length)
- C++17
bool tryCopyTo(int index, void * dest, int destIndex, int length)
- C++03(Deprecated)
bool tryCopyTo(int index, void * dest, int destIndex, int length)
- Java
public boolean tryCopyTo(int index, long dest, int destIndex, int length)
- Kotlin
fun tryCopyTo(index: Int, dest: Long, destIndex: Int, length: Int): Boolean
- Objective-C
- (bool)tryCopyTo:(int)index dest:(void *)dest destIndex:(int)destIndex length:(int)length
- Swift
public func tryCopyTo(_ index: Int32, _ dest: OpaquePointer?, _ destIndex: Int32, _ length: Int32) -> Bool
- C#
public virtual bool tryCopyTo(int index, IntPtr dest, int destIndex, int length)
partition¶
创建一个子Buffer，并引用原Buffer。一个Buffer在所有子Buffer释放后才会释放。
- C
void easyar_Buffer_partition(easyar_Buffer * This, int index, int length, easyar_Buffer * * Return)
- C++17
std::shared_ptr<Buffer> partition(int index, int length)
- C++03(Deprecated)
void partition(int index, int length, Buffer * * Return)
- Java
public @Nonnull Buffer partition(int index, int length)
- Kotlin
fun partition(index: Int, length: Int): Buffer
- Objective-C
- (easyar_Buffer *)partition:(int)index length:(int)length
- Swift
public func partition(_ index: Int32, _ length: Int32) -> Buffer
- C#
public virtual Buffer partition(int index, int length)
wrapByteArray¶
包装一个字节数组。可以指定起始位置和长度，可以指定Buffer是只读还是可读写（只读Buffer释放可能更快）。可以指定deleter回调，在Buffer被完全释放的时候，会调用deleter回调，执行用户自定义内存销毁行为。deleter必须是线程安全的。
- Java
public static @Nonnull Buffer wrapByteArray(byte @Nonnull[] bytes)
public static @Nonnull Buffer wrapByteArray(byte @Nonnull[] bytes, int index, int length, boolean readOnly, @Nonnull FunctorOfVoid deleter)
- Kotlin
companion object fun wrapByteArray(bytes: Array<Byte>): Buffer
companion object fun wrapByteArray(bytes: Array<Byte>, index: Int, length: Int, readOnly: Boolean, deleter: FunctorOfVoid): Buffer
- C#
public static Buffer wrapByteArray(byte[] bytes)
public static Buffer wrapByteArray(byte[] bytes, int index, int length)
public static Buffer wrapByteArray(byte[] bytes, int index, int length, Action deleter)
wrapBuffer¶
包装一个java.nio.Buffer。可以指定deleter回调，在Buffer被完全释放的时候，会调用deleter回调，执行用户自定义内存销毁行为。deleter必须是线程安全的。
- Java
public static @Nonnull Buffer wrapBuffer(java.nio.@Nonnull Buffer directBuffer)
public static @Nonnull Buffer wrapBuffer(java.nio.@Nonnull Buffer directBuffer, @Nonnull FunctorOfVoid deleter)
- Kotlin
companion object fun wrapBuffer(directBuffer: java.nio.Buffer): Buffer
companion object fun wrapBuffer(directBuffer: java.nio.Buffer, deleter: FunctorOfVoid): Buffer
copyFromByteArray¶
从字节数组复制数据到Buffer中。如果复制失败，则抛出异常。失败的原因有：源数据范围或目标数据范围超出可用范围。
- Java
public void copyFromByteArray(byte @Nonnull[] src)
public void copyFromByteArray(byte @Nonnull[] src, int srcIndex, int index, int length)
- Kotlin
fun copyFromByteArray(src: Array<Byte>): Unit
fun copyFromByteArray(src: Array<Byte>, srcIndex: Int, index: Int, length: Int): Unit
- C#
public void copyFromByteArray(byte[] src)
public void copyFromByteArray(byte[] src, int srcIndex, int index, int length)
copyToByteArray¶
从Buffer复制数据到字节数组中。如果复制失败，则抛出异常。失败的原因有：源数据范围或目标数据范围超出可用范围。
- Java
public void copyToByteArray(byte @Nonnull[] dest)
public void copyToByteArray(int index, byte @Nonnull[] dest, int destIndex, int length)
- Kotlin
fun copyToByteArray(dest: Array<Byte>): Unit
fun copyToByteArray(index: Int, dest: Array<Byte>, destIndex: Int, length: Int): Unit
- C#
public void copyToByteArray(byte[] dest)
public void copyToByteArray(int index, byte[] dest, int destIndex, int length)
tryCopyFromByteArray¶
从字节数组复制数据到Buffer中。如果复制成功，则返回true，否则返回false。失败的原因有：源数据范围或目标数据范围超出可用范围。
- Swift
public func tryCopyFromByteArray(_ src: [UInt8]) -> Bool
public func tryCopyFromByteArray(_ src: [UInt8], _ srcIndex: Int32, _ index: Int32, _ length: Int32) -> Bool
tryCopyToByteArray¶
从Buffer复制数据到字节数组中。如果复制成功，则返回true，否则返回false。失败的原因有：源数据范围或目标数据范围超出可用范围。
- Swift
public func tryCopyToByteArray(_ dest: [UInt8]) -> Bool
public func tryCopyToByteArray(_ index: Int32, _ dest: [UInt8], _ destIndex: Int32, _ length: Int32) -> Bool