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          #               N  O  T  E  S    &    T  O  D  O  S              #
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          #                      Nevma (info@nevma.gr)                     #
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  An off-hand todo list
  =====================

  http://www.smashingmagazine.com/2015/06/25/efficient-image-resizing-with-imagemagick/

  I found that slightly different -unsharp settings work better 
  (
    -unsharp 0.25x0.08+8.3+0.045 versus 
    -unsharp 0.25x0.25+8+0.065 without optimization
  )
  and that there’s no need to use -strip.



    Features
    ========

     - Settings

         - Allow debug
         - Types of images to handle
         - Transform PNGs to PNG8
         - Exceptions for certain images

     - WP Multisite
     - WP content outside of installation
     - WordPress 3.0 and down allow the "+"" character in filenames.
     - Delete old Adaptive Images files
     - In "?debug=true" mode, after the "image requested" part, show "image to be send"
     - Use PHP::exec for cache purge and cache size calculation
     - Does this plugin work for you? Then say so!
     - Resize (crunch) even the original images!
     - Upscale images smoothly?
     - Responsive image art direction

          Default anchors and zoom levels

            1. zoom level 1, 2, 3...
            2. anchor in image

                ---------------- 
                | tl   tc   tr |
                |              |
                | ml   mc   mr |
                |              |
                | bl   bc   br |
                ----------------

            3. different aspect ratio/dimensions

                - by breakpoint
                - by orientation

          https://usecases.responsiveimages.org/#art-direction/
          http://davidwalsh.name/responsive-images/
          https://developers.google.com/web/fundamentals/media/images/images-in-markup/
          https://css-tricks.com/which-responsive-images-solution-should-you-use/
          http://www.smashingmagazine.com/2013/07/08/choosing-a-responsive-image-solution/



    Benchmarks
    ==========

      - Image generation
      - Cache calculation
      - Cache purge



    Compatibility
    =============

      - W3 Total Cache
      - WP Super Cache
      - NginX

          location assets {
          }
            
          location ai-cache { ==> *** THE CACHE DIR ***
          }
            
          location / {
            rewrite \.(?:jpe?g|gif|png)$ /adaptive-images.php; ==> *** THE PHP SCRIPT ***
          }

      - Varnish
        Pressidium for configuration
      - SSL (Jonas Tietgen)
        The problem seemed to be wrong settings for my SSL certificate. I installed the plugin WordPress HTTPS and now 
        everything works fine. I guess the problem was that the file was loaded via http instead of https...



    Unit tests for image generation
    ===============================

      - PNG
      - PNG8
      - PNG256
      - PNG with alpha
      - PNG with trasparency
      - GIF
      - GIF with trasparency
      - JPEG

      (Compare with services like TinyPNG, etc.)



    Documentation
    =============

      - What-could-go-wrong section for usual problems users have.
      - A website!



    Also
    ====

      - https://wordpress.org/plugins/ricg-responsive-images/
      - https://wordpress.org/plugins/responsify-wp/
      - WURFL


########################################################################################################################



  Future ideas
  ============

   - Put the stylings in separate CSS files.
   - Ask users to rate plugin after x-images have been cached. 
   - Ajax calculate image cache size.
   - Ajax cleanup image cache size.
   - Report all folders and files in cache.
   - Per image cache purge.
   - Purge image cache beyond a size.
   - Per breakpoint cache purge.
   - Notify about cache size in WP cron, in WP admin, perhaps an email to the admin.
   - What if a user actually wants to see the full version of an image, even in a mobile network? 
   - When an image is deleted in the media gallery then its resized versions should be deleted, too.
   - When breakpoints are changed delete the cache directories of the unused breakpoints to clean up.
   - Original adaptive images PHP script error log is output inside the plugin files.



  Plugin needs 3 settings in order to function properly
  =====================================================

   1. database options set
   2. htacess file bit inserted
   3. user settings php file created



  Test cases to check with each version
  =====================================

   - Clean install
   - Deactivate then activate
   - Version 0.2.08 upgrade
   - Older version upgrade
   - Print debug info 
   - Images correctly sent for each breakpoint
   - Uninstall cleanup

   - Images

     - JPG
     - GIF
     - GIF with transparency
     - PNG
     - PNG with transparency