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[CP] Create framebuffer blend vertices based on the snapshot's texture size instead of coverage #149771

@jonahwilliams

Description

@jonahwilliams

Issue Link

#148213

Target

stable

PR Link

flutter/engine#53235

Changelog Description

  • Fixed rendering error advanced blend is double scaled.

Impacted Users

Impeller on iOS

Impact Description

Rendering appears correct when BlendMode greater than screen is used.

Workaround

Use Skia

Risk

low

Test Coverage

yes

Validation Steps

Run attached tests.

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Labels

cp: approvedApproved cherry-pick requestcp: mergedCherry-pick has been merged to the release branch.cp: reviewCherry-picks in the review queue

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