gaaclarke c0908f857e [Impeller] makes the gaussian down sample scalar fixed by adjusting the downsample padding (flutter/engine#54150)
This removes jitter in the gaussian blur.

Previous version of the shimmer test show this drops the average RMSE 30%.

testing:
  - positive change shown in average RMSE in ShimmerTest
  - existing golden tests

Part of a series of gaussian blur changes:
1) https://github.com/flutter/engine/pull/54148
1) https://github.com/flutter/engine/pull/54116
1) https://github.com/flutter/engine/pull/54150
1) https://github.com/flutter/engine/pull/54149

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
2024-07-30 15:35:18 +00:00
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