rgf

Documentation

Overview

Package rgf provides functionality for reading and writing EV3 RGF files.

Index

• func Decode(r io.Reader) (image.Image, error)
• func Encode(w io.Writer, src image.Image, render draw.Drawer) error
• func NewImageProxy(im image.Image, start, size image.Point, hardlimit bool, bt601 bool) image.Image
• type ImageProxy
  • func (proxy *ImageProxy) At(x, y int) color.Color
  • func (proxy *ImageProxy) Bounds() image.Rectangle
  • func (proxy *ImageProxy) ColorModel() color.Model

Functions

func Decode

func Decode(r io.Reader) (image.Image, error)

Decode RGF image from reader 'r'.

func Encode

func Encode(w io.Writer, src image.Image, render draw.Drawer) error

Encode image 'src' to RGF to writer 'w', while using Drawer 'render' for colorspace conversion. Render can be nil, in which case builtin Floyd-Steinberg dithering drawer will be used.

func NewImageProxy

func NewImageProxy(im image.Image, start, size image.Point, hardlimit bool, bt601 bool) image.Image

Create a new image proxy - im - image to wrap - start - crop source image to start from this point - size - crop source image to this width and height - hardlimit - whether to also crop to the 255x255 RGF limit - bt601 - whether to perform RGB -> BT.601 color conversion

Types

type ImageProxy

type ImageProxy struct {
	Image image.Image
	Crop  image.Rectangle
	BT601 bool
}

Image proxy for cropping and grayscale transformation

func (*ImageProxy) At

func (proxy *ImageProxy) At(x, y int) color.Color

Return original or filtered pixel at a specific point.

func (*ImageProxy) Bounds

func (proxy *ImageProxy) Bounds() image.Rectangle

Return cropped image bounds.

func (*ImageProxy) ColorModel

func (proxy *ImageProxy) ColorModel() color.Model

Return original or filtered color model.