switch to webp, use png for screenshot returns and be done with the accursed rmagick forever

workers/thumbnail_worker.rb

@@ -1,8 +1,6 @@
-require 'rmagick'
-
 class ThumbnailWorker
   THUMBNAILS_PATH = Site::THUMBNAILS_ROOT
-  MAXIMUM_IMAGE_SIZE = 2_000_000 # 2MB
+  MAXIMUM_IMAGE_SIZE = 10_000_000 # 10MB
 
   include Sidekiq::Worker
   sidekiq_options queue: :thumbnails, retry: 3, backtrace: true
@@ -14,43 +12,33 @@ class ThumbnailWorker
     site_file_path = site.files_path(path)
     return unless File.exist?(site_file_path)
 
-    # Large images jam up ImageMagick and eat a ton of memory, so we skip for now.
+    # Large images can eat a ton of memory, so we skip for now.
     return if File.size(site_file_path) > MAXIMUM_IMAGE_SIZE
 
-    img_list = Magick::ImageList.new
-
-    begin
-      img_list.from_blob File.read(site_file_path)
-    rescue Errno::ENOENT => e # Not found, skip
-      return
-    rescue Magick::ImageMagickError => e
-      GC.start full_mark: true, immediate_sweep: true
-      puts "thumbnail fail: #{site_file_path} #{e.inspect}"
-      return
-    end
-
-    img = img_list.first
-
     user_thumbnails_path = site.base_thumbnails_path
     FileUtils.mkdir_p user_thumbnails_path
     FileUtils.mkdir_p File.join(user_thumbnails_path, File.dirname(path))
 
     Site::THUMBNAIL_RESOLUTIONS.each do |res|
-      resimg = img.resize_to_fit(*res.split('x').collect {|r| r.to_i})
+      width, height = res.split('x').collect {|r| r.to_i}
       format = File.extname(path).gsub('.', '')
+      full_thumbnail_path = File.join(user_thumbnails_path, "#{path}.#{res}.webp")
 
-      save_ext = format.match(Site::LOSSY_IMAGE_REGEX) ? 'jpg' : 'png'
+      image = Rszr::Image.load site_file_path
+      if image.width > image.height
+        image.resize! width, :auto
+      else
+        image.resize! :auto, height
+      end
 
-      full_thumbnail_path = File.join(user_thumbnails_path, "#{path}.#{res}.#{save_ext}")
+      begin
+        tmpfile = "/tmp/#{SecureRandom.uuid}.png"
+        image.save(tmpfile)
 
-      resimg.write(full_thumbnail_path) { |i|
-        i.quality = 75
-      }
-      resimg.destroy!
-      #$image_optim.optimize_image! full_thumbnail_path
+        WebP.encode tmpfile, full_thumbnail_path, quality: 70
+      ensure
+        FileUtils.rm tmpfile
+      end
     end
-
-    img.destroy!
-    GC.start full_mark: true, immediate_sweep: true
   end
 end