[igt-dev] [PATCH i-g-t v4 18/21] lib/igt_frame: Add a checkerboard frame comparison method

[Maxime Ripard]

On Fri, Jan 25, 2019 at 03:06:20PM +0100, Paul Kocialkowski wrote:
> This introduces a new frame comparison method that was designed for
> patterns that follow a checkerboard style. These patterns are made of
> consecutive rectangular shapes with alternating solid colors. They are
> currently used for some Chamelium-based tests.
> 
> The method is particularly adapted for cases where the edges of the
> shapes might be blurred (e.g. due to scaling), which makes it impossible
> to use pixel-perfect or CRC-based comparisons to decide whether the
> captured frame matches the reference.
> 
> Overall, this test will first detect the edges of the pattern and later
> exclude them from comparison. Colors are compared between the reference
> and capture with a low threshold for error. A percentage of the faulty
> pixels is calculated and the captured frame is considered invalid if
> more than one percent of the pixels are erroneous.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski at bootlin.com>
> Reviewed-by: Lyude Paul <lyude at redhat.com>

Reviewed-by: Maxime Ripard <maxime.ripard at bootlin.com>

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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