Struct ImagesMut 

pub struct ImagesMut<'w> { /* private fields */ }

A mutable view over the images (frames) held by a MagickWand.

Obtained from MagickWand::images_mut. Because ImageMagick exposes a single internal iterator, only one ImageMut may be borrowed at a time; this is enforced by the borrow checker, as each accessor borrows the view mutably.

Implementations

impl<'w> ImagesMut<'w>

pub fn count(&self) -> usize

The number of images (frames) in the list.

pub fn is_empty(&self) -> bool

Returns true if the list contains no images.

pub fn get(&mut self, index: usize) -> Option<ImageMut<'_>>

Mutably borrow the frame at index, or None if out of bounds.

pub fn first(&mut self) -> Option<ImageMut<'_>>

Mutably borrow the first frame, or None if the list is empty.

pub fn last(&mut self) -> Option<ImageMut<'_>>

Mutably borrow the last frame, or None if the list is empty.

pub fn remove(&mut self, index: usize) -> Result<(), MagickError>

Remove the frame at index from the list.

Note that removing a frame shifts the indices of all later frames down by one, so any indices computed before the removal are stale afterwards.

pub fn append(&mut self, other: &MagickWand) -> Result<(), MagickError>

Append all frames from other to the end of this list.

pub fn for_each(&mut self, f: impl FnMut(usize, ImageMut<'_>))

Visit every frame in order, passing its index and a mutable borrow to f.

f must not add or remove frames (e.g. via ImageMut’s deref to MagickWand::remove_image / MagickWand::add_image): the set of indices to visit is fixed when iteration begins, so changing the frame count mid-iteration visits the wrong frames. Use ImagesMut::remove or ImagesMut::append before or after iterating instead.

pub fn try_for_each( &mut self, f: impl FnMut(usize, ImageMut<'_>) -> Result<(), MagickError>, ) -> Result<(), MagickError>

Like ImagesMut::for_each, but f may fail; the first error stops iteration and is returned. The same “do not add or remove frames” caveat as ImagesMut::for_each applies.