use progressive jpeg for previews

app/javascript/template_builder/upload.vue

@@ -16,7 +16,7 @@
       ref="input"
       type="file"
       class="hidden"
-      accept=".pdf"
+      accept="image/*, application/pdf"
       multiple
       @change="upload"
     >

config/initializers/active_storage.rb

@@ -12,6 +12,8 @@ Rails.configuration.to_prepare do
   end
 
   LoadActiveStorageConfigs.call
-rescue StandardError
+rescue StandardError => e
+  Rails.logger.debug(e)
+
   nil
 end

lib/templates/process_document.rb

@@ -30,7 +30,7 @@ module Templates
       image = Vips::Image.new_from_buffer(binary, '')
       image = image.resize(MAX_WIDTH / image.width.to_f)
 
-      io = StringIO.new(image.write_to_buffer(FORMAT, Q: Q))
+      io = StringIO.new(image.write_to_buffer(FORMAT, Q: Q, interlace: true))
 
       ActiveStorage::Attachment.create!(
         blob: ActiveStorage::Blob.create_and_upload!(
@@ -46,12 +46,13 @@ module Templates
       binary = attachment.download
 
       ActiveStorage::Attachment.where(name: ATTACHMENT_NAME, record: attachment).destroy_all
+      number_of_pages = HexaPDF::Document.new(io: StringIO.new(binary)).pages.size - 1
 
-      (0..).each do |page_number|
+      (0..number_of_pages).each do |page_number|
         page = Vips::Image.new_from_buffer(binary, '', dpi: DPI, page: page_number)
         page = page.resize(MAX_WIDTH / page.width.to_f)
 
-        io = StringIO.new(page.write_to_buffer(FORMAT, Q: Q))
+        io = StringIO.new(page.write_to_buffer(FORMAT, Q: Q, interlace: true))
 
         ActiveStorage::Attachment.create!(
           blob: ActiveStorage::Blob.create_and_upload!(
@@ -61,8 +62,6 @@ module Templates
           name: ATTACHMENT_NAME,
           record: attachment
         )
-      rescue Vips::Error
-        break
       end
     end
   end