Class: Middleman::ThumbnailGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/middleman-thumbnailer/thumbnail-generator.rb

Overview

actually creates the thumbnail names

Class Method Summary collapse

Class Method Details

.generate(source_dir, output_dir, origin, specs) ⇒ Object 



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/middleman-thumbnailer/thumbnail-generator.rb', line 22

def generate(source_dir, output_dir, origin, specs)
  origin_absolute = File.join(source_dir, origin)
  yield_images(origin_absolute, specs) do |img, spec|
    output_file = File.join(output_dir, spec[:name])
    origin_mtime = File.mtime origin_absolute
    #FIXME: this sucks & I should be shot, however in before_build, we havend created the build dir
    # therefor we will have to create it here
    output_file_immediate_dir = File.dirname output_file
    FileUtils.mkdir_p output_file_immediate_dir unless Dir.exist? output_file_immediate_dir
    if !File.exist?(output_file) || origin_mtime != File.mtime(output_file) then
      #puts "writing #{output_file}"
      img.write output_file 
    end
    File.utime(origin_mtime, origin_mtime, output_file)
 end
end

.image_for_spec(origin, spec) ⇒ Object 



52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/middleman-thumbnailer/thumbnail-generator.rb', line 52

def image_for_spec(origin, spec)
  image = ::Magick::Image.read(origin).first

  if spec.has_key? :dimensions then
    image.change_geometry(spec[:dimensions]) do |cols, rows, img|
      img = img.resize(cols, rows)
      img = img.sharpen(0.5, 0.5)
      return img
    end 
  end
  return image
end

.original_map_for_files(files, specs) ⇒ Object

This returns a reverse mapping from a thumbnail’s filename to the original filename, and the thumbnail’s specs



67
68
69
70
71
72
73
74
75
 
# File 'lib/middleman-thumbnailer/thumbnail-generator.rb', line 67

def original_map_for_files(files, specs)
  map = files.inject({}) do |memo, file|
    generated_specs = self.specs(file, specs)
    generated_specs.each do |name, spec|
      memo[spec[:name]] = {:original => generated_specs[:original][:name], :spec => spec}
    end
    memo
  end
end

.specs(origin, dimensions) ⇒ Object 



9
10
11
12
13
14
15
16
17
18
19
20
 
# File 'lib/middleman-thumbnailer/thumbnail-generator.rb', line 9

def specs(origin, dimensions)
  ret = {original: {name: origin}}
  file_parts = origin.split('.')
  basename = file_parts[0..-2].join('.')
  ext = file_parts.last

  dimensions.each do |name, dimension|
    ret[name] = {name: "#{basename}-#{name}-#{dimension}.#{ext}", dimensions: dimension}
  end

  ret
end

.yield_images(origin, specs) ⇒ Object 



39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/middleman-thumbnailer/thumbnail-generator.rb', line 39

def yield_images(origin, specs)
  image = ::Magick::Image.read(origin).first
  specs.each do |name, spec|
    if spec.has_key? :dimensions then
      image.change_geometry(spec[:dimensions]) do |cols, rows, img|
        img = img.resize(cols, rows)
        img = img.sharpen(0.5, 0.5)
        yield img, spec
      end
    end
  end
end