Resize and crop by any single dimension

[mguryanov]

This changes serve to reduce image by any single dimension value. Hidden dimension is implicitly calculated as current image size.

[muxx]

Please fix in README alias /path/to/backgraund/image; to alias /path/to/background/image;

[muxx]

I think it will be more correctly if you show examples for existing location which were before in README because your location examples not give any specific info. Thanks.

[mguryanov]

Ok, you're rigth. I will do it, but your location examples not correct.
This module can't handle multiple action like crop and resize.

this location chunk

       image_filter                resize $resize_width $resize_height;
       image_filter                crop   $crop_width $crop_height;

effect only last action - crop :)

[mguryanov]

In confirmation latest comment, we use nginx-image-filter about 2y+ in production. Multi-stage image modification can achieved by using proxy_pass wheel, for example

	##
	# CORRECT sequential image processing : ie crop after resize
	##

        location ~ ^/r/(?<resize_width>\d+|-)?x(?<resize_height>\d+|-)?/(?<img>[^/]+)$ {
		##
		# resize
		##
                image_filter resize $resize_width $resize_height;
                alias /path/to/image/$img;
        }

        location ~ ^/(?<resize>r/(?:\d+|-)?x(?:\d+|-)?)/c/(?<crop_width>\d+|-)?x(?<crop_height>\d+|-)?/(?<img>.+)$ {
		##
		# resize redirect
		##
                proxy_pass http://127.0.0.1/$resize/$img;

		##
		# crop
		##
                image_filter crop $crop_width $crop_height;
        }

unfortunately your configuration take handle only cropping, because there settings masquerade resizing

	##
	# INCORRECT sequential image processing : crop only, never resize
	##

        location ~ ^/intaro/r/(?<resize_width>\d+|-)x(?<resize_height>\d+|-)/c/(?<crop_width>\d+|-)x(?<crop_height>\d+|-)/(?<img>.+) {
                alias                       /Users/goshan/Sites/Zot/Zot/web/$img;

                try_files                   "" @404;

		#
		# Bad logic
		#
                image_filter                resize $resize_width $resize_height;
                image_filter                crop   $crop_width $crop_height;
	}

how to check it?
for example, we have image gdlogobig.png ( 336 x 218 )
according request - first step is resizing, and last is cropping, resizing checks by setting one dimension to lesser (50) when orignal value (336), and cropping values sets to originals (336 x 218)

http://localhost/intaro/r/50x218/c/336x218/gdlogobig.png 	<== INCORRECT, image not changed, because crop settings masquarade resizing
http://localhost/r/50x218/c/336x218/gdlogobig.png		<== CORRECT, image changed - resizing happened