go/src/image/gif/reader.go

var errNotEnough …

var errTooMuch …

var errBadPixel …

type reader …

const fColorTable …

const fInterlace …

const fColorTableBitsMask …

const gcTransparentColorSet …

const gcDisposalMethodMask …

const DisposalNone …

const DisposalBackground …

const DisposalPrevious …

const sExtension …

const sImageDescriptor …

const sTrailer …

const eText …

const eGraphicControl …

const eComment …

const eApplication …

func readFull(r io.Reader, b []byte) error { … }

func readByte(r io.ByteReader) (byte, error) { … }

type decoder …

type blockReader …

func (b *blockReader) fill() { … }

func (b *blockReader) ReadByte() (byte, error) { … }

// blockReader must implement io.Reader, but its Read shouldn't ever actually
// be called in practice. The compress/lzw package will only call [blockReader.ReadByte].
func (b *blockReader) Read(p []byte) (int, error) { … }

// close primarily detects whether or not a block terminator was encountered
// after reading a sequence of data sub-blocks. It allows at most one trailing
// sub-block worth of data. I.e., if some number of bytes exist in one sub-block
// following the end of LZW data, the very next sub-block must be the block
// terminator. If the very end of LZW data happened to fill one sub-block, at
// most one more sub-block of length 1 may exist before the block-terminator.
// These accommodations allow us to support GIFs created by less strict encoders.
// See https://golang.org/issue/16146.
func (b *blockReader) close() error { … }

// decode reads a GIF image from r and stores the result in d.
func (d *decoder) decode(r io.Reader, configOnly, keepAllFrames bool) error { … }

func (d *decoder) readHeaderAndScreenDescriptor() error { … }

func (d *decoder) readColorTable(fields byte) (color.Palette, error) { … }

func (d *decoder) readExtension() error { … }

func (d *decoder) readGraphicControl() error { … }

func (d *decoder) readImageDescriptor(keepAllFrames bool) error { … }

func (d *decoder) newImageFromDescriptor() (*image.Paletted, error) { … }

func (d *decoder) readBlock() (int, error) { … }

type interlaceScan …

var interlacing …

// uninterlace rearranges the pixels in m to account for interlaced input.
func uninterlace(m *image.Paletted) { … }

// Decode reads a GIF image from r and returns the first embedded
// image as an [image.Image].
func Decode(r io.Reader) (image.Image, error) { … }

type GIF …

// DecodeAll reads a GIF image from r and returns the sequential frames
// and timing information.
func DecodeAll(r io.Reader) (*GIF, error) { … }

// DecodeConfig returns the global color model and dimensions of a GIF image
// without decoding the entire image.
func DecodeConfig(r io.Reader) (image.Config, error) { … }

func init() { … }