droid_wrap::android::renderscript

Struct Allocation

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pub struct Allocation { /* private fields */ }
👎Deprecated: Renderscript 已在 API 级别 31 中弃用。请参阅迁移指南了解建议的替代方案。
Expand description

此类提供将数据传递到 RenderScript 内核和从 RenderScript 内核传递数据的主要方法。Allocation 为给定类型提供后备存储。 Allocation 还包含一组使用标志,用于指示如何使用 Allocation。例如,Allocation 可能具有使用标志,指定它既可以从脚本中使用,也可以作为 Sampler 的输入。 开发人员必须使用 syncAll 同步这些不同的用法,以确保 Allocation 的不同用户对内存具有一致的视图。例如,如果将 Allocation 用作一个内核的输出,并将其用作后续内核的 Sampler 输入,则开发人员必须在启动第二个内核之前调用 syncAll(Allocation.USAGE_SCRIPT) 以确保正确性。 Allocation 可以使用 copyFrom 例程填充。对于更复杂的 Element 类型,可以使用 copyFromUnchecked 方法从字节数组或类似构造中复制。

开发人员指南 有关创建使用 RenderScript 的应用程序的更多信息,请阅读 RenderScript 开发人员指南。

Methods from Deref<Target = GlobalRef>§

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pub fn as_obj(&self) -> &JObject<'static>

Get the object from the global ref

This borrows the ref and prevents it from being dropped as long as the JObject sticks around.

Methods from Deref<Target = JObject<'static>>§

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pub fn as_raw(&self) -> *mut _jobject

Returns the raw JNI pointer.

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impl Debug for Allocation

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Deref for Allocation

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type Target = GlobalRef

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl From<&GlobalRef> for Allocation

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fn from(obj: &GlobalRef) -> Self

Converts to this type from the input type.
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impl Into<GlobalRef> for &Allocation

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fn into(self) -> GlobalRef

Converts this type into the (usually inferred) input type.
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impl JObjNew for Allocation

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type Fields = ()

字段类型
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fn _new(this: &GlobalRef, fields: Self::Fields) -> Self

从java对象创建本地对象。 this java对象引用。
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fn null() -> Self
where Self: Sized, Self::Fields: Default,

创建空对象。
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impl JObjRef for Allocation

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fn java_ref(&self) -> GlobalRef

获取java对象引用。
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impl JType for Allocation

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const CLASS: &'static str = "android/renderscript/Allocation"

java类的名称。
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const OBJECT_SIG: &'static str = "Landroid/renderscript/Allocation;"

对象的签名描述。
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type Error = Error

错误类型。
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const DIM: u8 = 0u8

数组维度,0表示不是数组
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impl PartialEq for Allocation

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fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl ToString for Allocation

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fn to_string(&self) -> String

Converts the given value to a String. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

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type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.