Refactor TrueColorSample #1335

Job	Run time
ruff	9s
sdist	1m 4s
mypy	23s
parse_sdl (macos-latest, 3.2.16)	26s
parse_sdl (windows-latest, 3.2.16)	39s
test-docs	2m 1s
pyodide	2m 25s
build-macos (pp310-*)	5m 6s
tox (ubuntu-latest)	1m 57s
build-macos (cp310-*_universal2)	1m 55s
linux-wheels (x86_64, cp310-manylinux*)	4m 12s
build (windows-latest, 3.10, x64)	3m 54s
linux-wheels (x86_64, pp310-manylinux*)	3m 40s
build (ubuntu-latest, 3.10, x64)	4m 0s
build (ubuntu-latest, pypy-3.10, x64)	2m 54s
linux-wheels (aarch64, cp310-manylinux*)	4m 10s
linux-wheels (aarch64, pp310-manylinux*)	3m 37s
build (windows-latest, 3.10, x86)	3m 53s
build (windows-latest, pypy-3.10, x64)	4m 12s
publish	0s
	50m 37s

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