MiniMagick for FileColumn

Posted by devon on March 7th, 2008 filed in Rails应用

file_column用于图片上传、缩放非常方便，比如在系统中做用户头像之类。

但file_column默认使用rmagick来做图象处理。在实际使用过程中，发现rmagick有内存泄露问题，所以，将file_column中的图象缩放改为 mini_magick。

在安装 file_column 后，只需要修改 vendor/plugins/file_column/lib/magick_file_column.rb。改动如下(完整代码请参考 http://cookbook.enjoyrails.com/cookbooks/9)：

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7,8c7,8
<           img = ::Magick::Image::read(absolute_path).first
<         rescue ::Magick::ImageMagickError
---
>           img = ::MiniMagick::Image::from_file(absolute_path)
>         rescue ::MiniMagick::MiniMagickError
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<         ::Magick
---
>         ::MiniMagick
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<        require 'RMagick'
---
>         require 'mini_magick'
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<           img = ::Magick::Image::read(absolute_path).first
<         rescue ::Magick::ImageMagickError
---
>           img = ::MiniMagick::Image::from_file(absolute_path)
>         rescue ::MiniMagick::MiniMagickError
86a87,89
>
>       img.combine_options do | i |
>
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<           img = img.crop(::Magick::CenterGravity, [img.columns, w].min,
<                          [img.rows, h].min, true)
---
>           i.gravity "Center"
>           i.crop "#{[img.columns, w].min}x#{[img.rows, h].min}"
95,97c98
<           img = img.change_geometry(img_options[:size]) do |c, r, i|
<             i.resize(c, r)
<           end
---
>           i.resize img_options[:size]
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>
>         i.strip # strip unnecessary profiles
>         i.depth 8 # otherwise PNG bloats, big time
>         i.quality 80 # save with reasonable quality for a thumbnail
>       end
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<         img.write(dest_path) do
<           if img_options[:attributes]
<             img_options[:attributes].each_pair do |property, value|
<               self.send "#{property}=", value
<             end
<           end
<         end
---
>         img.write(dest_path) #do
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<       require 'RMagick'
---
>       require 'mini_magick'
</code>

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