ccitt

package

v0.0.0-...-57c1bf3 Latest Latest Go to latest Published: Sep 1, 2019 License: BSD-3-Clause Imports: 5 Imported by: 0

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Repository

github.com/Andyfoo/golang

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Documentation ¶

Overview ¶

Package ccitt implements a CCITT (fax) image decoder.

Index ¶

func DecodeIntoGray(dst *image.Gray, r io.Reader, order Order, sf SubFormat, opts *Options) error
func NewReader(r io.Reader, order Order, sf SubFormat, width int, height int, opts *Options) io.Reader
type Options
type Order
type SubFormat

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func DecodeIntoGray ¶

func DecodeIntoGray(dst *image.Gray, r io.Reader, order Order, sf SubFormat, opts *Options) error

DecodeIntoGray decodes the CCITT-formatted data in r into dst.

It returns an error if dst's width and height don't match the implied width and height of CCITT-formatted data.

func NewReader ¶

func NewReader(r io.Reader, order Order, sf SubFormat, width int, height int, opts *Options) io.Reader

NewReader returns an io.Reader that decodes the CCITT-formatted data in r. The resultant byte stream is one bit per pixel (MSB first), with 1 meaning white and 0 meaning black. Each row in the result is byte-aligned.

Types ¶

type Options ¶

type Options struct {
	// Align means that some variable-bit-width codes are byte-aligned.
	Align bool
	// Invert means that black is the 1 bit or 0xFF byte, and white is 0.
	Invert bool
}

Options are optional parameters.

type Order ¶

type Order uint32

Order specifies the bit ordering in a CCITT data stream.

const (
	// LSB means Least Significant Bits first.
	LSB Order = iota
	// MSB means Most Significant Bits first.
	MSB
)

type SubFormat ¶

type SubFormat uint32

SubFormat represents that the CCITT format consists of a number of sub-formats. Decoding or encoding a CCITT data stream requires knowing the sub-format context. It is not represented in the data stream per se.

const (
	Group3 SubFormat = iota
	Group4
)

Source Files ¶

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