impl<W: Write> JpegEncoder<W>

fn new(w: W) -> JpegEncoder<W>

Create a new encoder that writes its output to w

fn new_with_quality(w: W, quality: u8) -> JpegEncoder<W>

Create a new encoder that writes its output to w, and has the quality parameter quality with a value in the range 1-100 where 1 is the worst and 100 is the best.

fn set_pixel_density(self: &mut Self, pixel_density: PixelDensity)

Set the pixel density of the images the encoder will encode. If this method is not called, then a default pixel aspect ratio of 1x1 will be applied, and no DPI information will be stored in the image.

fn encode(self: &mut Self, image: &[u8], width: u32, height: u32, color_type: ExtendedColorType) -> ImageResult<()>

Encodes the image stored in the raw byte buffer image that has dimensions width and height and ColorType c

The Image in encoded with subsampling ratio 4:2:2

Panics

Panics if width * height * color_type.bytes_per_pixel() != image.len().

fn encode_image<I: GenericImageView>(self: &mut Self, image: &I) -> ImageResult<()>
where
    <I as >::Pixel: PixelWithColorType

Encodes the given image.

As a special feature this does not require the whole image to be present in memory at the same time such that it may be computed on the fly, which is why this method exists on this encoder but not on others. Instead the encoder will iterate over 8-by-8 blocks of pixels at a time, inspecting each pixel exactly once. You can rely on this behaviour when calling this method.

The Image in encoded with subsampling ratio 4:2:2

impl<T> Any for JpegEncoder<W>

fn type_id(self: &Self) -> TypeId

impl<T> Borrow for JpegEncoder<W>

fn borrow(self: &Self) -> &T

impl<T> BorrowMut for JpegEncoder<W>

fn borrow_mut(self: &mut Self) -> &mut T

impl<T> From for JpegEncoder<W>

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Pointable for JpegEncoder<W>

unsafe fn init(init: <T as Pointable>::Init) -> usize

unsafe fn deref<'a>(ptr: usize) -> &'a T

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

unsafe fn drop(ptr: usize)

impl<T, U> Into for JpegEncoder<W>

fn into(self: Self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

impl<T, U> TryFrom for JpegEncoder<W>

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto for JpegEncoder<W>

fn try_into(self: Self) -> Result<U, <U as TryFrom<T>>::Error>

impl<W> Freeze for JpegEncoder<W>

impl<W> RefUnwindSafe for JpegEncoder<W>

impl<W> Send for JpegEncoder<W>

impl<W> Sync for JpegEncoder<W>

impl<W> Unpin for JpegEncoder<W>

impl<W> UnsafeUnpin for JpegEncoder<W>

impl<W> UnwindSafe for JpegEncoder<W>

impl<W: Write> ImageEncoder for JpegEncoder<W>

fn write_image(self: Self, buf: &[u8], width: u32, height: u32, color_type: ExtendedColorType) -> ImageResult<()>