go/src/image/png/reader.go

const ctGrayscale …

const ctTrueColor …

const ctPaletted …

const ctGrayscaleAlpha …

const ctTrueColorAlpha …

const cbInvalid …

const cbG1 …

const cbG2 …

const cbG4 …

const cbG8 …

const cbGA8 …

const cbTC8 …

const cbP1 …

const cbP2 …

const cbP4 …

const cbP8 …

const cbTCA8 …

const cbG16 …

const cbGA16 …

const cbTC16 …

const cbTCA16 …

func cbPaletted(cb int) bool { … }

func cbTrueColor(cb int) bool { … }

const ftNone …

const ftSub …

const ftUp …

const ftAverage …

const ftPaeth …

const nFilter …

const itNone …

const itAdam7 …

type interlaceScan …

var interlacing …

const dsStart …

const dsSeenIHDR …

const dsSeenPLTE …

const dsSeentRNS …

const dsSeenIDAT …

const dsSeenIEND …

const pngHeader …

type decoder …

type FormatError …

func (e FormatError) Error() string { … }

var chunkOrderError …

type UnsupportedError …

func (e UnsupportedError) Error() string { … }

func (d *decoder) parseIHDR(length uint32) error { … }

func (d *decoder) parsePLTE(length uint32) error { … }

func (d *decoder) parsetRNS(length uint32) error { … }

// Read presents one or more IDAT chunks as one continuous stream (minus the
// intermediate chunk headers and footers). If the PNG data looked like:
//
//	... len0 IDAT xxx crc0 len1 IDAT yy crc1 len2 IEND crc2
//
// then this reader presents xxxyy. For well-formed PNG data, the decoder state
// immediately before the first Read call is that d.r is positioned between the
// first IDAT and xxx, and the decoder state immediately after the last Read
// call is that d.r is positioned between yy and crc1.
func (d *decoder) Read(p []byte) (int, error) { … }

// decode decodes the IDAT data into an image.
func (d *decoder) decode() (image.Image, error) { … }

// readImagePass reads a single image pass, sized according to the pass number.
func (d *decoder) readImagePass(r io.Reader, pass int, allocateOnly bool) (image.Image, error) { … }

// mergePassInto merges a single pass into a full sized image.
func (d *decoder) mergePassInto(dst image.Image, src image.Image, pass int) { … }

func (d *decoder) parseIDAT(length uint32) (err error) { … }

func (d *decoder) parseIEND(length uint32) error { … }

func (d *decoder) parseChunk(configOnly bool) error { … }

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

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

// Decode reads a PNG image from r and returns it as an [image.Image].
// The type of Image returned depends on the PNG contents.
func Decode(r io.Reader) (image.Image, error) { … }

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

func init() { … }