gaaclarke 95df38e38b Revert "[Impeller] Use downsample shader for blur instead of mip levels. (#53760)" (flutter/engine#54148)
This is reverted since it introduces shimmering when the downsample
scalar goes to 1/16th. It was reverted instead of fixed to allow the
test that should have blocked this to land in the meantime.

reverts https://github.com/flutter/engine/pull/53760
fixed and relanded in https://github.com/flutter/engine/pull/54149

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

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2024-07-26 14:16:51 -07:00
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