imageutil

README

imageutil

Utilies related to Golang images.

Features

• fast "generic" get/set RGBA value from/to an image (no memory allocation)
• process parts of an image concurrently
• RBGA <=> NRGBA conversion

Documentation

Overview

Package imageutil provides utilities related to images.

Index

• func NRGBAToRGBA(r, g, b, a uint32) (uint32, uint32, uint32, uint32)
• func Parallel1D(r image.Rectangle, f func(image.Rectangle))
• func Parallel2D(r image.Rectangle, f func(image.Rectangle))
• func RGBAToNRGBA(r, g, b, a uint32) (uint32, uint32, uint32, uint32)
• type AtFunc
  • func NewAtFunc(p image.Image) AtFunc
• type SetFunc
  • func NewSetFunc(p draw.Image) SetFunc

Functions

func NRGBAToRGBA

func NRGBAToRGBA(r, g, b, a uint32) (uint32, uint32, uint32, uint32)

NRGBAToRGBA converts NRGBA to RGBA.

func Parallel1D

func Parallel1D(r image.Rectangle, f func(image.Rectangle))

Parallel1D dispatches tasks concurrently for a Rectangle.

It splits the image horizontally in GOMAXPROCS parts and runs GOMAXPROCS workers.

It should be used if all the pixels of the image have the same process cost.

func Parallel2D

func Parallel2D(r image.Rectangle, f func(image.Rectangle))

Parallel2D dispatches tasks concurrently for a Rectangle.

It splits the image in a GOMAXPROCS x GOMAXPROCS grid and runs GOMAXPROCS workers.

It should be used if all the pixels of the image don't have the same process cost.

func RGBAToNRGBA

func RGBAToNRGBA(r, g, b, a uint32) (uint32, uint32, uint32, uint32)

RGBAToNRGBA converts RGBA to NRGBA.

Types

type AtFunc

type AtFunc func(x, y int) (r, g, b, a uint32)

AtFunc returns a RGBA value of the pixel at (x, y).

func NewAtFunc

func NewAtFunc(p image.Image) AtFunc

NewAtFunc returns an AtFunc for an Image.

nolint: gocyclo

type SetFunc

type SetFunc func(x, y int, r, g, b, a uint32)

SetFunc sets a RGBA value to the pixel at (x, y).

func NewSetFunc

func NewSetFunc(p draw.Image) SetFunc

NewSetFunc returns a SetFunc for an Image.

nolint: gocyclo