Struct purrmitive::webp::WebPDecoder

pub struct WebPDecoder<R> { /* fields omitted */ }

WebP Image format decoder. Currently only supportes the luma channel (meaning that decoded images will be grayscale).

Implementations

impl<R> WebPDecoder<R> where
    R: Read, 

pub fn new(r: R) -> Result<WebPDecoder<R>, ImageError>

Create a new WebPDecoder from the Reader r. This function takes ownership of the Reader.

Trait Implementations

impl<'a, R> ImageDecoder<'a> for WebPDecoder<R> where
    R: 'a + Read, 

type Reader = WebpReader<R>

The type of reader produced by into_reader.

pub fn dimensions(&self) -> (u32, u32)

Returns a tuple containing the width and height of the image

pub fn color_type(&self) -> ColorType

Returns the color type of the image data produced by this decoder

pub fn into_reader(
    self
) -> Result<<WebPDecoder<R> as ImageDecoder<'a>>::Reader, ImageError>

Returns a reader that can be used to obtain the bytes of the image. For the best performance, always try to read at least scanline_bytes from the reader at a time. Reading fewer bytes will cause the reader to perform internal buffering.

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

Returns all the bytes in the image.

pub fn original_color_type(&self) -> ExtendedColorType

Retuns the color type of the image file before decoding

pub fn total_bytes(&self) -> u64

Returns the total number of bytes in the decoded image.

pub fn scanline_bytes(&self) -> u64

Returns the minimum number of bytes that can be efficiently read from this decoder. This may be as few as 1 or as many as total_bytes().

pub fn read_image_with_progress<F>(
    self,
    buf: &mut [u8],
    progress_callback: F
) -> Result<(), ImageError> where
    F: Fn(Progress), 

Same as read_image but periodically calls the provided callback to give updates on loading progress.