Description
I like to see a (optional) prefer option in vips_thumbnail which can be set to a new enum (let's call it VIPS_PREFER_WIDTH or VIPS_PREFER_HEIGHT for example).
Use case scenario:
To prevent reduction or enlargement in the horizontal axis, I'm setting the target resize width to VIPS_MAX_COORD (which is currently 10000000), when a user only have specified a fixed height. I'm doing vice versa for the target resize height (so setting it to VIPS_MAX_COORD when a fixed width is specified). This feels somewhat hackish.
Example which currently fails due to reduction in the vertical axis (the dimensions of the input JPEG-file are 1600x622):
https://gist.github.com/kleisauke/8e090b4f83679cd536cd3bc7aebe60a2
thumbnail width = 499
expected width = 500
thumbnail height = 194
expected height = 194This is fixable if we change the script to this:
https://gist.github.com/kleisauke/a7df1817fa7ed8f01a627a7eccd342c4
thumbnail width = 500
expected width = 500
thumbnail height = 194
expected height = 194When a prefer option is in vips_thumbnail we can do:
https://gist.github.com/kleisauke/1dc424dfdf1b2b65192be4189a4c6364