qr

package

v0.0.0-...-bf64b92 Latest Latest Go to latest Published: May 31, 2016 License: Apache-2.0 Imports: 8 Imported by: 19

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Repository

github.com/vitrun/qart

Links

Open Source Insights

Documentation ¶

Index ¶

func Resample(m image.Image, r image.Rectangle, w, h int) *image.RGBA
func ResizeNRGBA(m *image.NRGBA, r image.Rectangle, w, h int) *image.RGBA
func ResizeRGBA(m *image.RGBA, r image.Rectangle, w, h int) *image.RGBA
type Code
- func Encode(text string, level Level) (*Code, error)
type Level

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Resample ¶

func Resample(m image.Image, r image.Rectangle, w, h int) *image.RGBA

Resample returns a resampled copy of the image slice r of m. The returned image has width w and height h.

func ResizeNRGBA ¶

func ResizeNRGBA(m *image.NRGBA, r image.Rectangle, w, h int) *image.RGBA

ResizeNRGBA returns a scaled copy of the RGBA image slice r of m. The returned image has width w and height h.

func ResizeRGBA ¶

func ResizeRGBA(m *image.RGBA, r image.Rectangle, w, h int) *image.RGBA

ResizeRGBA returns a scaled copy of the RGBA image slice r of m. The returned image has width w and height h.

Types ¶

type Code ¶

type Code struct {
	Bitmap []byte // 1 is black, 0 is white
	Size   int    // number of pixels on a side
	Stride int    // number of bytes per row
	Scale  int    // number of image pixels per QR pixel
}

A Code is a square pixel grid. It implements image.Image and direct PNG encoding.

func Encode ¶

func Encode(text string, level Level) (*Code, error)

Encode returns an encoding of text at the given error correction level.

func (*Code) Black ¶

func (c *Code) Black(x, y int) bool

Black returns true if the pixel at (x,y) is black.

func (*Code) Image ¶

func (c *Code) Image() image.Image

Image returns an Image displaying the code.

func (*Code) PNG ¶

func (c *Code) PNG() []byte

PNG returns a PNG image displaying the code.

PNG uses a custom encoder tailored to QR codes. Its compressed size is about 2x away from optimal, but it runs about 20x faster than calling png.Encode on c.Image().

type Level ¶

type Level int

A Level denotes a QR error correction level. From least to most tolerant of errors, they are L, M, Q, H.

const (
	L Level = iota // 20% redundant
	M              // 38% redundant
	Q              // 55% redundant
	H              // 65% redundant
)

Source Files ¶

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