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Go DZI Generator

Go DZI Generator is a pure Go implementation of vips dzsave.

References

• Inside Deep Zoom – Part II : Mathematical Analysis – RTFM / Daniel Gasienica

Documentation

Overview

Package Go DZI Generator is a pure Go implementation of `vips dzsave`.

Index

• func ComputeTileRect(opt *Option, col, row, maxCol, maxRow uint) (rect image.Rectangle)
• func Generate(m *image.NRGBA, opt *Option) error
• func GetLevelGrids(level, width, height, tileSize uint) (uint, uint)
• func GetMaxLevel(width, height uint) uint
• func SaveTile(dirPath string, level, col, row uint, format ImageFormat, m *image.NRGBA, ...) error
• type ImageFormat
• type Option

Functions

func ComputeTileRect

func ComputeTileRect(opt *Option, col, row, maxCol, maxRow uint) (rect image.Rectangle)

ComputeTileRect computes and returns corresponding rectangle based on given option, column and row.

func Generate

func Generate(m *image.NRGBA, opt *Option) error

Generate generates DZI files of given image and option. Width and height in option and image should be same.

func GetLevelGrids

func GetLevelGrids(level, width, height, tileSize uint) (uint, uint)

GetLevelGrids returns columns and rows number of current level, tile size, width and height.

func GetMaxLevel

func GetMaxLevel(width, height uint) uint

GetMaxLevel computes and returns the maximum level of DZI files based on given width and height.

func SaveTile

func SaveTile(dirPath string, level, col, row uint, format ImageFormat, m *image.NRGBA, wg *sync.WaitGroup) error

SaveTile saves tile to given path based on level, column and row.

Types

type ImageFormat

type ImageFormat string

const (
	JPEG ImageFormat = "jpeg"
	PNG  ImageFormat = "png"
)

type Option

type Option struct {
	DirPath       string
	Format        ImageFormat
	Overlap       uint
	TileSize      uint
	Width, Height uint
}

Option represents general DZI options.