Leandro Ribeiro 82a832ef38 tests: improvements to color effects tests ...

This fixes a huge bug: we were ignoring the return value from
verify_screen_content(), which meant that tests were always passing.

Also, this adds tests for single-pixel solid color buffers, which are
useful to verify that color effects are actually applied in such cases.
Renderers (as the GL-renderer) may simply use glClear() instead of going
through the full rendering pipeline when drawing solid colors, and we
need to ensure that color effects are applied in those cases as well.

Besides that, some refactoring was done to improve the code.

Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>

2026-01-12 12:55:49 +00:00

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