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[Impeller] texture passthrough for opacity isn't general enough #119474

@jonahwilliams

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@jonahwilliams

This can be seen on the main wonder screen of wonderous. We don't set the texture contents as being able to defer applying opacity, resulting in an extra pass to draw this texture with opacity before applying the color filter. We should be able to detect this and pull the opacity through the snapshot as normal.

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    P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)e: impellerImpeller rendering backend issues and features requestsengineflutter/engine related. See also e: labels.

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