Add convenience function for loading a picture directly from a file #89

	# This workflow will build a golang project
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go

	name: Go

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	jobs:

	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	- name: Set up Go
	uses: actions/setup-go@v4
	with:
	go-version-file: 'go.mod'

	- name: Install goveralls
	if: ${{ github.ref == 'refs/heads/main' }}
	run: go install github.com/mattn/goveralls@latest

	- name: Install dependencies
	run: sudo apt install xorg-dev xvfb

	- name: Build
	run: go build -v ./...

	- name: Test
	# Run the test suite using the "virtual framebuffer X server for X Version 11" (xvfb)
	# to allow tests to make windows within the server environment of GitHub Actions.
	run: xvfb-run go test -v -covermode atomic -coverprofile=covprofile ./...

	- name: Gofmt
	# Run gofmt, print the output and exit with status code 1 if it isn't empty.
	run: \|
	OUTPUT=$(gofmt -d ./)
	echo "$OUTPUT"
	test -z "$OUTPUT"

	- name: Send coverage
	if: ${{ github.ref == 'refs/heads/main' }}
	env:
	COVERALLS_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
	run: goveralls -coverprofile=covprofile -service=github

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