Add support for HEIF based images #2633
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…nto heic-support
src/ImageSharp/Formats/Heif/Av1/Transform/Forward/Av1Dct4ForwardTransformer.cs
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src/ImageSharp/Formats/Heif/Av1/Transform/Forward/Av1Dct4ForwardTransformer.cs
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Prerequisites
Description
This PR is an attempt to start with #1320
Implemented decoding and encoding of images based on a HEIF (ISO/IEC 23008-12:2022) container. These include (amongst others): HEIC, HIF and AVIF.
Please note this PR does NOT add any new compression algorithm to ImageSharp. For now it will take a JPEG thumbnail as its pixel source.
Needless to say, much more work is needed after this PR to reach the goal. I'm try to help there also.
Please do let me know any comments, also on whether to support the HEIF file format in the first place.