Redmine 甘特图导出 PDF 和 PNG 中文乱码问题

Redmine使用了RMagick来处理图片，fpdf处理PDF，并在调用时设定了字体
PDF中文字体

redmine 中关于PDF字体设置的代码

          case pdf_encoding
          when 'UTF-8'
            @font_for_content = 'FreeSans'
            @font_for_footer = 'FreeSans'
          when 'CP949'
            extend(PDF_Korean)
            AddUHCFont()
            @font_for_content = 'UHC'
            @font_for_footer = 'UHC'
          when 'CP932', 'SJIS', 'SHIFT_JIS'
            extend(PDF_Japanese)
            AddSJISFont()
            @font_for_content = 'SJIS'
            @font_for_footer = 'SJIS'
          when 'GB18030'
            extend(PDF_Chinese)
            AddGBFont()
            @font_for_content = 'GB'
            @font_for_footer = 'GB'
          when 'BIG5'
            extend(PDF_Chinese)
            AddBig5Font()
            @font_for_content = 'Big5'
            @font_for_footer = 'Big5'
          else
            @font_for_content = 'Arial'
            @font_for_footer = 'Helvetica'
          end

在中文时，Redmine 使用了GB字体，在debian or Ubuntu系统中，可使用APT安装
apt-get install ttf-arphic-bkai00mp ttf-arphic-bsmi00lp ttf-arphic-gbsn00lp ttf-arphic-gbsn00lp

参考 http://isis.poly.edu/~qiming/chinese-debian-mini-howto.html
图片中文问题(PNG)
图片中文也是类似的原理，下面是Redmine config/configuration.yml 中的内容
# This setting is not necessary in non CJK.
#
# Examples for Japanese:
# Windows:
# rmagick_font_path: C:windowsfontsmsgothic.ttc
# Linux:
# rmagick_font_path: /usr/share/fonts/ipa-mincho/ipam.ttf
#
rmagick_font_path:

1>创建目录 /usr/share/fonts/truetype/arphic/

2> 下载gbsn00lp.ttf.gz

cd /tmp

wget http://down1.chinaunix.net/distfiles/gbsn00lp.ttf.gz

gunzip gbsn00lp.ttf.gz

cp /tmp/gbsn00lp.ttf   /usr/share/fonts/truetype/arphic/

3>修改这段代码，设定适当的中文字体路径即可，如：
rmagick_font_path: /usr/share/fonts/truetype/arphic/gbsn00lp.ttf

重新启动服务器，现在中文导出应当正常了。

本文使用的Redmine版本为 3.3.0