qr

type CompressionLevel ¶

type CompressionLevel int

CompressionLevel indicates the compression level.

const (
	DefaultCompression CompressionLevel = 0
	NoCompression      CompressionLevel = -1
	BestSpeed          CompressionLevel = -2
	BestCompression    CompressionLevel = -3
)

type EncoderBuffer ¶

type EncoderBuffer pngEncoder

EncoderBuffer holds the buffers used for encoding PNG images.

type EncoderBufferPool ¶

type EncoderBufferPool interface {
	Get() *EncoderBuffer
	Put(*EncoderBuffer)
}

EncoderBufferPool is an interface for getting and returning temporary instances of the EncoderBuffer struct. This can be used to reuse buffers when encoding multiple images.

type ErrEncodingJPEG ¶

type ErrEncodingJPEG struct {
	Err error
}

func (e *ErrEncodingJPEG) Error() string

type ErrEncodingPNG ¶

type ErrEncodingPNG struct {
	Err error
}

func (e *ErrEncodingPNG) Error() string

type ErrEncodingSVG ¶

type ErrEncodingSVG struct {
	Err error
}

func (e *ErrEncodingSVG) Error() string

type ErrFailedToCreateQRCode ¶

type ErrFailedToCreateQRCode struct {
	Err error
}

func (e *ErrFailedToCreateQRCode) Error() string

type Generator ¶

type Generator interface {
	GenerateQRCode(content string, size int, margin int, outputFormat OutputFormat, opts ...options) (io.WriterTo, error)
}

func NewGenerator(idealQRLogo image.Image, maxCacheSizeInBytes int64) Generator

type InputMatrix ¶

type InputMatrix interface {
	GetWidth() int
	GetHeight() int
	Get(int, int) bool
}

type Options ¶

type Options struct {
	Quality int
}

Options are the encoding parameters. Quality ranges from 1 to 100 inclusive, higher is better.

type OutputFormat ¶

type OutputFormat string

const (
	PNG OutputFormat = "png"
	JPG OutputFormat = "jpg"
	SVG OutputFormat = "svg"
)

type PNGEncoder ¶

type PNGEncoder struct {
	CompressionLevel CompressionLevel

	// BufferPool optionally specifies a buffer pool to get temporary
	// EncoderBuffers when encoding an image.
	BufferPool EncoderBufferPool
}

PNGEncoder configures encoding PNG images.

func (enc *PNGEncoder) Encode(w io.Writer, m *mat2d) error

type Rect ¶

type Rect struct {
	X1, Y1, X2, Y2 int
}

Rect describes a rectangle where (X1, Y2) is the upper-left corner and (X2, Y2) is the lower-right corner

func FindRects(m InputMatrix) []Rect