imgtools

README

imgtools

Utilities for working with images in Go, completing the standard image package.

• imgtools/binimg : binary image implementation of the image.Image interface, that is an image with two possible values for each pixel.

• imgtools/imgscan : fast scanning of rectangular regions of image.Image.

Documentation

Index

• func IsPowerOf2Image(img image.Image) bool
• func Pow2Roundup(x int) int
• func PowerOf2Image(src image.Image, pad color.Color) (image.Image, error)

Functions

func IsPowerOf2Image

func IsPowerOf2Image(img image.Image) bool

IsPowerOf2Image reports wether img is a power-of-2 square image or not.

func Pow2Roundup

func Pow2Roundup(x int) int

Pow2Roundup rounds up to next higher power of 2, or n if n is already a power of 2.

func PowerOf2Image

func PowerOf2Image(src image.Image, pad color.Color) (image.Image, error)

PowerOf2Image returns a square image which dimension being a power-of-2, it does so by creating such square image with uniform pad color, and copying the pixels of src over it, at point { 0,0}.

Note: if src dimensions is already a power-of-2 square image, it is returned as-is.This is an helper function supports the standard Go image and binimg.Image types.