12b56a350b8110ded1f6c883c9433e2ec2f261e9
Alternative to https://github.com/flutter/engine/pull/52746 Work towards https://github.com/flutter/flutter/issues/138798 If possible, use a render pass to clear texture to transparent black. The goal is to reduce the CPU cost for larger atlases.
[Impeller] use render pass to clear glyph atlas texture to transparent black. (flutter/engine#52791)
Description
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