rotate(90) should have resulting width===oldHeight and height===oldWidth

[arnhrwd]

Expected Behavior

rotate(90) should have resulting width===oldHeight and height===oldWidth

Current Behavior

rotate(90) provides a rotated image with incorrect dimensions. Code for the plugin indeed shows it does things like uni-laterally increase the resulting width and height to be an even number, etc.

I assume it is the same for rotate(-90), rotate(180), and rotate(-180)

Probably some special cases could be considered for fast rotate.

• Jimp Version: ^0.16.2
• Operating System: Ubuntu
• Node version: 18.10

[hipstersmoothie]

@arnhrwd would you mind submitting a PR with the changes you have in mind?

[black-turtle]

Hi @hipstersmoothie @arnhrwd if you guys don't mind can I work on this? as this is open for some time.

I am thinking of using Matrix rotation, if rotate angle is multiple of 90 degrees.

I already have a workable solution. If it seems good I will create a PR.

If you want to check the code before PR, please check from here

Thanks!

[hipstersmoothie]

If this works and the tests pass (and it solves the issue) I would love a PR!