From 290e452aec615ef935516524cf445b40c5254fe4 Mon Sep 17 00:00:00 2001
From: Jure Grabnar <jgrabnar@biosistemika.com>
Date: Fri, 21 Jun 2019 16:15:08 +0200
Subject: [PATCH 1/3] Add ghostscript to Dockerfile

---
 Dockerfile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Dockerfile b/Dockerfile
index a653a486e..6fe764827 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,6 +20,7 @@ RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - && \
   postgresql-client \
   default-jre-headless \
   unison \
+  ghostscript \
   sudo graphviz --no-install-recommends \
   libfile-mimeinfo-perl && \
   apt-get install -y --no-install-recommends -t $(cat /tmp/lsb_release)-backports libreoffice && \

From 33cc3c29d18d9e6a960b283304af5ae1912e8d61 Mon Sep 17 00:00:00 2001
From: Jure Grabnar <jgrabnar@biosistemika.com>
Date: Fri, 21 Jun 2019 19:42:58 +0200
Subject: [PATCH 2/3] Move PDF thumbnail generation to ImageMagick

Closes SCI-3579
---
 .../custom_file_preview.rb                    | 28 +++++++++++++------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/lib/paperclip_processors/custom_file_preview.rb b/lib/paperclip_processors/custom_file_preview.rb
index c749d9e6d..f6ea765e6 100644
--- a/lib/paperclip_processors/custom_file_preview.rb
+++ b/lib/paperclip_processors/custom_file_preview.rb
@@ -10,16 +10,26 @@ module Paperclip
       dst = TempfileFactory.new.generate("#{basename}.#{options[:format]}")
 
       begin
-        Paperclip.run(
-          libreoffice_path,
-          "--headless --invisible --convert-to png --outdir #{directory} #{@file.path}"
-        )
+        if @file.content_type == 'application/pdf'
+          # We use special convert options for PDFs to improve quality and
+          # background, we append [0] to convert only the first page
+          convert(
+            ":source -resize '#{options[:geometry]}' -format #{options[:format]} -flatten -quality 70 :dest",
+            source: File.expand_path(@file.path) + '[0]',
+            dest: File.expand_path(dst.path)
+          )
+        else
+          Paperclip.run(
+            libreoffice_path,
+            "--headless --invisible --convert-to png --outdir #{directory} #{@file.path}"
+          )
 
-        convert(
-          ":source -resize '#{options[:geometry]}' -format #{options[:format]} #{options[:convert_options]} :dest",
-          source: File.expand_path(original_preview_file),
-          dest: File.expand_path(dst.path)
-        )
+          convert(
+            ":source -resize '#{options[:geometry]}' -format #{options[:format]} #{options[:convert_options]} :dest",
+            source: File.expand_path(original_preview_file),
+            dest: File.expand_path(dst.path)
+          )
+        end
       ensure
         File.delete(original_preview_file) if File.file?(original_preview_file)
       end

From 1a38324209533338f50370642c1cf1f30ebab03e Mon Sep 17 00:00:00 2001
From: Jure Grabnar <jgrabnar@biosistemika.com>
Date: Tue, 2 Jul 2019 10:10:48 +0200
Subject: [PATCH 3/3] Add ghostscript to Dockerfile.production

---
 Dockerfile.production | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Dockerfile.production b/Dockerfile.production
index ca922f441..0e6b5baa9 100644
--- a/Dockerfile.production
+++ b/Dockerfile.production
@@ -17,6 +17,7 @@ RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - && \
   postgresql-client \
   netcat \
   default-jre-headless \
+  ghostscript \
   sudo graphviz --no-install-recommends \
   libfile-mimeinfo-perl && \
   apt-get install -y --no-install-recommends -t stretch-backports libreoffice && \