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Fixes #1822

Large values such as 1920×35791423 px cause integer overflow. This patch fixes the overflow by using saturating multiplication operations in the damage shaper.

@YaLTeR
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YaLTeR commented Oct 7, 2025

It doesn't fail somewhere down the line with this, right?

@he1senbrg
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Based on my testing so far, it doesn’t fail. I tested it with:

Rectangle::<i32, Physical>::new((0, 0).into(), (1920, 35791423).into()),
Rectangle::<i32, Physical>::new((100, 100).into(), (800, 600).into()),

and

Rectangle::<i32, Physical>::new((0, 0).into(), (1920, 1000).into()),
Rectangle::<i32, Physical>::new((0, 35790423).into(), (1920, 1000).into()),

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Integer overflows in the damage shaper
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