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This PR adds support for true streaming, a new feature that has landed in libvips 8.9.
https://libvips.github.io/libvips/2019/11/29/True-streaming-for-libvips.html
At the time of writing the savers
magicksave
(&output=gif
) andtiffsave
(&output=tiff
) has yet to be reworked for the new source/target API (see libvips/libvips#1541). There's a good chance that within libvips 8.10 this has been reworked.In order to maintain backward compatibility, this feature is therefore conditionally excluded with:
#if VIPS_VERSION_AT_LEAST(8, 10, 0)
However, it can be tested earlier by compiling the master branch of libvips.