feat: Compress PNG; detect and compare the size of compressed and uncompressed file
What does this PR do? (Please give us a brief description of what this PR does.)
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Allows compressing PNG images to jpeg
Many screenshot tools, such as the default screenshot tool in Windows, generate png images and will not compress them when uploading before this commit.
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Detect and compare the size of compressed and uncompressed file, preventing uploaded "compressed" images from being larger than the source file
This happens in webp -> png frequently
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If this merge request makes changes to the Firefish API, please update docs/api-change.md
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I updated the document / This merge request doesn't include API changes
Edited by Linca