Struct image::SubImage

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pub struct SubImage<I> { /* private fields */ }
Expand description

A View into another image

Instances of this struct can be created using:

Note that this does not implement GenericImage, but it dereferences to one which allows you to use it as if it did. See Design Considerations below for details.

Design Considerations

For reasons relating to coherence, this is not itself a GenericImage or a GenericImageView. In short, we want to reserve the ability of adding traits implemented for all generic images but in a different manner for SubImage. This may be required to ensure that stacking sub-images comes at no double indirect cost.

If, ultimately, this is not needed then a directly implementation of GenericImage can and will get added. This inconvenience may alternatively get resolved if Rust allows some forms of specialization, which might make this trick unnecessary and thus also allows for a direct implementation.

Implementations§

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impl<I> SubImage<I>

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pub fn new(image: I, x: u32, y: u32, width: u32, height: u32) -> SubImage<I>

Construct a new subimage The coordinates set the position of the top left corner of the SubImage.

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pub fn change_bounds(&mut self, x: u32, y: u32, width: u32, height: u32)

Change the coordinates of this subimage.

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pub fn to_image( &self ) -> ImageBuffer<<<I as Deref>::Target as GenericImageView>::Pixel, Vec<<<<I as Deref>::Target as GenericImageView>::Pixel as Pixel>::Subpixel>>where I: Deref, I::Target: GenericImageView + 'static,

Convert this subimage to an ImageBuffer

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impl<I> SubImage<I>where I: Deref, I::Target: GenericImageView,

Methods for readable images.

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pub fn view( &self, x: u32, y: u32, width: u32, height: u32 ) -> SubImage<&I::Target>

Create a sub-view of the image.

The coordinates given are relative to the current view on the underlying image.

Note that this method is preferred to the one from GenericImageView. This is accessible with the explicit method call syntax but it should rarely be needed due to causing an extra level of indirection.

use image::{GenericImageView, RgbImage, SubImage};
let buffer = RgbImage::new(10, 10);

let subimage: SubImage<&RgbImage> = buffer.view(0, 0, 10, 10);
let subview: SubImage<&RgbImage> = subimage.view(0, 0, 10, 10);

// Less efficient and NOT &RgbImage
let _: SubImage<&_> = GenericImageView::view(&*subimage, 0, 0, 10, 10);
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pub fn inner(&self) -> &I::Target

Get a reference to the underlying image.

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impl<I> SubImage<I>where I: DerefMut, I::Target: GenericImage,

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pub fn sub_image( &mut self, x: u32, y: u32, width: u32, height: u32 ) -> SubImage<&mut I::Target>

Create a mutable sub-view of the image.

The coordinates given are relative to the current view on the underlying image.

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pub fn inner_mut(&mut self) -> &mut I::Target

Get a mutable reference to the underlying image.

Trait Implementations§

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impl<I: Clone> Clone for SubImage<I>

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fn clone(&self) -> SubImage<I>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<I> Deref for SubImage<I>where I: Deref,

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type Target = SubImageInner<I>

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

Dereferences the value.
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impl<I> DerefMut for SubImage<I>where I: DerefMut,

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl<I: Copy> Copy for SubImage<I>

Auto Trait Implementations§

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impl<I> RefUnwindSafe for SubImage<I>where I: RefUnwindSafe,

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impl<I> Send for SubImage<I>where I: Send,

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impl<I> Sync for SubImage<I>where I: Sync,

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impl<I> Unpin for SubImage<I>where I: Unpin,

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impl<I> UnwindSafe for SubImage<I>where I: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere 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 Twhere 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.