Streaming Image encoders #1219
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…te slice This change allows users to encode jpeg images from other sources than memory, thus finally allowing the encoding of images that do not fit in memory. This also allows users to make the encoder work in a streaming fashion. (see image-rs#1219) This also finally allows encoding images from other pixel formats than 8-bit RGB. The conversion to 8bit YCbCr (used in JPEG) is done on the fly during encoding.
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See also #867 |
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I would like to be able to encode images that do not fit in memory.
My specific use case for this functionality is dezoomify-rs, which handles very large images directly on users' machines with limited memory.
This is more generally applicable to any application handling large images.
Draft
Several image encoders do already provide a streaming encoder:
Some others do not, but have a structure that simply iterates on an image's pixels which should make it easy to implement, such as
It would be awesome if image-rs could provide a simple interface that would abstract away each individual codec implementation and provide a generic streaming image encoder. The encoder would be created by specifying the image size, then would have a method allowing to add pixels to it. The pixels would be optionally buffered based on the underlying image codec's chunk size requirements, then provided to it.
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