Struct png::Reader

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pub struct Reader<R: Read> { /* private fields */ }
Expand description

PNG reader (mostly high-level interface)

Provides a high level that iterates over lines or whole images.

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impl<R: Read> Reader<R>

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pub fn info(&self) -> &Info

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pub fn next_frame(&mut self, buf: &mut [u8]) -> Result<(), DecodingError>

Decodes the next frame into buf

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pub fn next_row(&mut self) -> Result<Option<&[u8]>, DecodingError>

Returns the next processed row of the image

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pub fn next_interlaced_row( &mut self ) -> Result<Option<(&[u8], Option<(u8, u32, u32)>)>, DecodingError>

Returns the next processed row of the image

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pub fn output_color_type(&mut self) -> (ColorType, BitDepth)

Returns the color type and the number of bits per sample of the data returned by Reader::next_row and Reader::frames`.

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pub fn output_buffer_size(&self) -> usize

Returns the number of bytes required to hold a deinterlaced image frame that is decoded using the given input transformations.

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pub fn output_line_size(&self, width: u32) -> usize

Returns the number of bytes required to hold a deinterlaced row.

Auto Trait Implementations§

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impl<R> Freeze for Reader<R>
where R: Freeze,

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impl<R> RefUnwindSafe for Reader<R>
where R: RefUnwindSafe,

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impl<R> Send for Reader<R>
where R: Send,

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impl<R> Sync for Reader<R>
where R: Sync,

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impl<R> Unpin for Reader<R>
where R: Unpin,

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impl<R> UnwindSafe for Reader<R>
where R: UnwindSafe,

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<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.