fix RGBA calculation being way to expensive for recursively mixed col… #297

	---
	name: Haskell CI

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

	permissions: read-all

	jobs:
	build_and_test:
	strategy:
	matrix:
	os:
	- ubuntu-latest
	plan:
	- {build: stack}
	include:
	- os: ubuntu-latest
	apt-get: graphviz

	runs-on: ${{ matrix.os }}

	steps:
	- name: Install ${{ matrix.os }} Packages
	uses: mstksg/get-package@v1
	with:
	apt-get: ${{ matrix.apt-get }}

	- uses: actions/checkout@v4

	- name: Cache Stack
	id: cache-stack-unix
	uses: actions/cache@v4
	with:
	path: ~/.stack
	key: ${{ matrix.os }}-${{ matrix.plan.build }}-stack-home-${{ hashFiles('stack.yaml') }}-${{ hashFiles('**/package.yaml') }}

	- name: Setup stack
	uses: haskell-actions/setup@v2
	with:
	enable-stack: true
	stack-no-global: true

	- name: Install dependencies
	run: \|
	set -ex
	stack --no-terminal --install-ghc build --test --bench --only-dependencies --stack-yaml run.yaml
	set +ex
	env:
	BUILD: ${{ matrix.plan.build }}

	- name: Build and test
	run: \|
	set -ex
	stack --no-terminal test --coverage --bench --no-run-benchmarks --haddock --no-haddock-deps --stack-yaml run.yaml
	set +ex
	env:
	BUILD: ${{ matrix.plan.build }}

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