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warn against thumbnail_image

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see https://github.com/libvips/libvips/issues/1637#issuecomment-623094732
This commit is contained in:
John Cupitt 2020-05-03 12:31:17 +01:00
parent a5680abbd6
commit 54bfa23025
1 changed files with 6 additions and 1 deletions
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5
libvips/resample/thumbnail.c
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@ -1522,6 +1522,11 @@ vips_thumbnail_image_init( VipsThumbnailImage *image )
* *
* Exacty as vips_thumbnail(), but read from an existing image. * Exacty as vips_thumbnail(), but read from an existing image.
* *
* This operation
* is not able to exploit shrink-on-load features of image load libraries, so
* it can be much slower than `vips_thumbnail()` and produce poorer quality
* output. Only use it if you really have to.
*
* See also: vips_thumbnail(). * See also: vips_thumbnail().
* *
* Returns: 0 on success, -1 on error. * Returns: 0 on success, -1 on error.