Struct image::png::PNGDecoder

pub struct PNGDecoder<R> {
    // some fields omitted
}

The representation of a PNG decoder

Currently does not support decoding of interlaced images

Methods

impl<R: Read> PNGDecoder<R>

fn new(r: R) -> PNGDecoder<R>

Create a new decoder that decodes from the stream r

fn palette<'a>(&'a self) -> &'a [(u8, u8, u8)]

Returns a reference to the color palette used for indexed color images. Each array element is a tuple of RGB values.

Trait Implementations

impl<R: Read> ImageDecoder for PNGDecoder<R>

fn dimensions(&mut self) -> ImageResult<(u32, u32)>

Returns a tuple containing the width and height of the image

fn colortype(&mut self) -> ImageResult<ColorType>

Returns the color type of the image e.g RGB(8) (8bit RGB)

fn row_len(&mut self) -> ImageResult<usize>

Returns the length in bytes of one decoded row of the image

fn read_scanline(&mut self, buf: &mut [u8]) -> ImageResult<u32>

Reads one row from the image into buf and returns the row index

fn read_image(&mut self) -> ImageResult<DecodingResult>

Decodes the entire image and return it as a Vector

fn is_animated(&mut self) -> ImageResult<bool>

Returns true if the image is animated

fn into_frames(self) -> ImageResult<Frames>

Returns the frames of the image If the image is not animated it returns a single frame

fn load_rect(&mut self, x: u32, y: u32, length: u32, width: u32) -> ImageResult<Vec<u8>>

Decodes a specific region of the image, represented by the rectangle starting from x and y and having length and width