Struct image::jpeg::JpegDecoder [−][src]
JPEG decoder
Implementations
impl<R: Read> JpegDecoder<R>[src]
pub fn new(r: R) -> ImageResult<JpegDecoder<R>>[src]
Create a new decoder that decodes from the stream r
pub fn scale(
&mut self,
requested_width: u16,
requested_height: u16
) -> ImageResult<(u16, u16)>[src]
&mut self,
requested_width: u16,
requested_height: u16
) -> ImageResult<(u16, u16)>
Configure the decoder to scale the image during decoding.
This efficiently scales the image by the smallest supported scale factor that produces an image larger than or equal to the requested size in at least one axis. The currently implemented scale factors are 1/8, 1/4, 1/2 and 1.
To generate a thumbnail of an exact size, pass the desired size and then scale to the final size using a traditional resampling algorithm.
The size of the image to be loaded, with the scale factor applied, is returned.
Trait Implementations
impl<'a, R: 'a + Read> ImageDecoder<'a> for JpegDecoder<R>[src]
type Reader = JpegReader<R>
The type of reader produced by into_reader.
fn dimensions(&self) -> (u32, u32)[src]
fn color_type(&self) -> ColorType[src]
fn into_reader(self) -> ImageResult<Self::Reader>[src]
fn read_image(self, buf: &mut [u8]) -> ImageResult<()>[src]
fn original_color_type(&self) -> ExtendedColorType[src]
fn total_bytes(&self) -> u64[src]
fn scanline_bytes(&self) -> u64[src]
fn read_image_with_progress<F: Fn(Progress)>(
self,
buf: &mut [u8],
progress_callback: F
) -> ImageResult<()>[src]
self,
buf: &mut [u8],
progress_callback: F
) -> ImageResult<()>
Auto Trait Implementations
impl<R> RefUnwindSafe for JpegDecoder<R> where
R: RefUnwindSafe,
R: RefUnwindSafe,
impl<R> Send for JpegDecoder<R> where
R: Send,
R: Send,
impl<R> Sync for JpegDecoder<R> where
R: Sync,
R: Sync,
impl<R> Unpin for JpegDecoder<R> where
R: Unpin,
R: Unpin,
impl<R> UnwindSafe for JpegDecoder<R> where
R: UnwindSafe,
R: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T[src]
impl<T> From<T> for T[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T> Pointable for T
pub const ALIGN: usize
type Init = T
The type for initializers.
pub unsafe fn init(init: <T as Pointable>::Init) -> usize
pub unsafe fn deref<'a>(ptr: usize) -> &'a T
pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T
pub unsafe fn drop(ptr: usize)
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,