A rendering engine library for Go supporting both SDL2 and WebAssembly (HTML Canvas) targets.
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package render
import (
// OpenImage opens an image file from disk.
// Supported file types are: jpeg, gif, png, bmp.
func OpenImage(filename string) (image.Image, error) {
fh, err := os.Open(filename)
if err != nil {
return nil, err
var img image.Image
switch filepath.Ext(filename) {
case ".jpg":
case ".jpeg":
img, err = jpeg.Decode(fh)
case ".png":
img, err = png.Decode(fh)
case ".bmp":
img, err = bmp.Decode(fh)
case ".gif":
img, err = gif.Decode(fh)
return nil, errors.New("unsupported file type")
return img, err
// ImageToRGBA converts a Go image.Image into an image.RGBA.
func ImageToRGBA(input image.Image) *image.RGBA {
var bounds = input.Bounds()
var rgba = image.NewRGBA(bounds)
for x := bounds.Min.X; x < bounds.Max.X; x++ {
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
color := input.At(x, y)
rgba.Set(x, y, color)
return rgba