Struct gif::encoder::Encoder

pub struct Encoder<W: Write> {
    w: Option<W>,
    global_palette: bool,
    width: u16,
    height: u16,
    buffer: Vec<u8>,
}

GIF encoder.

Fields

w: Option<W>

global_palette: bool

width: u16

height: u16

buffer: Vec<u8>

Implementations

impl<W: Write> Encoder<W>

pub fn new( w: W, width: u16, height: u16, global_palette: &[u8], ) -> Result<Self, EncodingError>

Creates a new encoder.

global_palette gives the global color palette in the format [r, g, b, ...], if no global palette shall be used an empty slice may be supplied.

pub fn set_repeat(&mut self, repeat: Repeat) -> Result<(), EncodingError>

Write an extension block that signals a repeat behaviour.

fn write_global_palette(self, palette: &[u8]) -> Result<Self, EncodingError>

Writes the global color palette.

pub fn write_frame(&mut self, frame: &Frame<'_>) -> Result<(), EncodingError>

Writes a frame to the image.

Note: This function also writes a control extension if necessary.

fn write_frame_header(&mut self, frame: &Frame<'_>) -> Result<(), EncodingError>

fn write_image_block(&mut self, data: &[u8]) -> Result<(), EncodingError>

fn write_encoded_image_block( writer: &mut W, data_with_min_code_size: &[u8], ) -> Result<(), EncodingError>

fn write_color_table( writer: &mut W, table: &[u8], padding: usize, ) -> Result<(), EncodingError>

fn check_color_table(table: &[u8]) -> Result<(&[u8], usize, u8), EncodingError>

returns rounded palette size, number of missing colors, and table size flag

pub fn write_extension( &mut self, extension: ExtensionData, ) -> Result<(), EncodingError>

Writes an extension to the image.

It is normally not necessary to call this method manually.

pub fn write_raw_extension( &mut self, func: AnyExtension, data: &[&[u8]], ) -> Result<()>

Writes a raw extension to the image.

This method can be used to write an unsupported extension to the file. func is the extension identifier (e.g. Extension::Application as u8). data are the extension payload blocks. If any contained slice has a lenght > 255 it is automatically divided into sub-blocks.

pub fn write_lzw_pre_encoded_frame( &mut self, frame: &Frame<'_>, ) -> Result<(), EncodingError>

Writes a frame to the image, but expects Frame.buffer to contain LZW-encoded data from Frame::make_lzw_pre_encoded.

Note: This function also writes a control extension if necessary.

fn write_screen_desc(&mut self, flags: u8) -> Result<()>

Writes the logical screen desriptor

pub fn get_ref(&self) -> &W

Gets a reference to the writer instance used by this encoder.

pub fn get_mut(&mut self) -> &mut W

Gets a mutable reference to the writer instance used by this encoder.

It is inadvisable to directly write to the underlying writer.

pub fn into_inner(self) -> Result<W>

Finishes writing, and returns the io::Write instance used by this encoder

fn write_trailer(&mut self) -> Result<()>

Write the final tailer.

fn writer(&mut self) -> Result<&mut W>

Trait Implementations

impl<W: Write> Drop for Encoder<W>

fn drop(&mut self)

Executes the destructor for this type.