# [−][src]Struct png::Decoder

    pub struct Decoder<R: Read> { /* fields omitted */ }

PNG Decoder

## Methods

### `impl<R: Read> Decoder<R>`[src]

#### `pub fn new(r: R) -> Decoder<R>`[src]

#### `pub fn new_with_limits(r: R, l: Limits) -> Decoder<R>`[src]

#### `pub fn set_limits(&mut self, limits: Limits)`[src]

Images that are considered too big

    use std::fs::File;
    use png::{Decoder, Limits};
    // This image is 32x32 pixels, so it's more than four pixels in size.
    let mut limits = Limits::default();
    limits.pixels = 4;
    let mut decoder = Decoder::new_with_limits(File::open("tests/pngsuite/basi0g01.png").unwrap(), limits);
    assert!(decoder.read_info().is_err());
    // This image is 32x32 pixels, so it's exactly 1024 pixels in size.
    let mut limits = Limits::default();
    limits.pixels = 1024;
    let mut decoder = Decoder::new_with_limits(File::open("tests/pngsuite/basi0g01.png").unwrap(), limits);
    assert!(decoder.read_info().is_ok());

#### `pub fn read_info(self) -> Result<(OutputInfo, Reader<R>), DecodingError>`[src]

Reads all meta data until the first IDAT chunk

## Trait Implementations

### `impl<R: Read> Parameter<Decoder<R>> for Transformations`[src]

#### `fn set_param(self, this: &mut Decoder<R>)`[src]

### `impl<R: Read> HasParameters for Decoder<R>`[src]

#### `fn set<T: Parameter<Self>>(&mut self, value: T) -> &mut Self`[src]

## Auto Trait Implementations

### `impl<R> Send for Decoder<R> where
R: Send,`

### `impl<R> Unpin for Decoder<R> where
R: Unpin,`

### `impl<R> Sync for Decoder<R> where
R: Sync,`

### `impl<R> UnwindSafe for Decoder<R> where
R: UnwindSafe,`

### `impl<R> RefUnwindSafe for Decoder<R> where
R: RefUnwindSafe,`

## Blanket Implementations

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

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

The type returned in the event of a conversion error.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)