Switch from custom trim operation to vips_find_trim

[fwang2002]

Is there any way to get crop offsets from the original image when use trim(). I mean not the original image in the pipe, but the nearest pipe item before trim.

[lovell]

Hello, this is not at the moment. After libvips 8.6 is released we can switch from sharp's internal trim operation to libvips' forthcoming vips_find_trim operation, which will allow us to expose the calculated offsets.

[jcupitt]

Hello, vips keeps metadata fields xoffset / yoffset which record the position of the input image in the output image. For example:

john@kiwi:~/pics$ vips smartcrop k2.jpg x.v 500 500
john@kiwi:~/pics$ vipsheader -f xoffset x.v
-339
john@kiwi:~/pics$ vipsheader -f yoffset x.v
-1542

They should be valid after any kind of coordinate transform. They might be useful in this case.

[ArmorDarks]

libvips 8.6 has been released. Are there any chances to get this feature?

[lovell]

@ArmorDarks As always, happy to help with and accept a PR for this.

[lovell]

v0.21.0 now available with this change.