Class: ImageResizer::Processor

Inherits:
Object
  • Object
show all
Includes:
Configurable, Utils
Defined in:
lib/image_resizer/processor.rb

Constant Summary collapse

GRAVITIES = 
{
  'nw' => 'NorthWest',
  'n'  => 'North',
  'ne' => 'NorthEast',
  'w'  => 'West',
  'c'  => 'Center',
  'e'  => 'East',
  'sw' => 'SouthWest',
  's'  => 'South',
  'se' => 'SouthEast'
}
RESIZE_GEOMETRY =

Geometry string patterns

/^\d*x\d*[><%^!]?$|^\d+@$/
CROPPED_RESIZE_GEOMETRY =

e.g. ‘20x50#ne’

/^(\d+)x(\d+)#(\w{1,2})?$/
CROP_GEOMETRY =

e.g. ‘30x30+10+10’

/^(\d+)x(\d+)([+-]\d+)?([+-]\d+)?(\w{1,2})?$/
THUMB_GEOMETRY = 
Regexp.union RESIZE_GEOMETRY, CROPPED_RESIZE_GEOMETRY, CROP_GEOMETRY

Instance Attribute Summary

Attributes included from Loggable

#log_object

Instance Method Summary collapse

Methods included from Configurable

included

Methods included from Loggable

#log, #log=, #use_same_log_as

Instance Method Details

#_resize(temp_object, geometry, format = nil) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 48

def _resize(temp_object, geometry, format=nil)
  convert(temp_object, "-resize '#{geometry}'", format)
end

#auto_orient(temp_object) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 52

def auto_orient(temp_object)
  convert(temp_object, "-auto-orient")
end

#convert(temp_object, args = '', format = nil) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 220

def convert(temp_object, args='', format=nil)
  super
end

#crop(temp_object, opts = {}) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 56

def crop(temp_object, opts={})
  width   = opts[:width]
  height  = opts[:height]
  gravity = GRAVITIES[opts[:gravity]]
  x       = "#{opts[:x] || 0}"
  x = '+' + x unless x[/^[+-]/]
  y       = "#{opts[:y] || 0}"
  y = '+' + y unless y[/^[+-]/]
  repage  = opts[:repage] == false ? '' : '+repage'

  resize = opts[:resize] ? "-resize #{opts[:resize]} " : ''
  gravity = gravity ? "-gravity #{gravity} " : ''

  convert(temp_object, "#{resize}#{gravity}-crop #{width}x#{height}#{x}#{y} #{repage}", opts[:format])
end

#crop_to_frame_and_resize(temp_object, options) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 128

def crop_to_frame_and_resize(temp_object, options)
  analyzer = ImageResizer::Analyzer.new

  desired_width = options[:width].to_i
  desired_height = options[:height].to_i

  upper_left_x_percent = options[:upper_left].first
  upper_left_y_percent = options[:upper_left].last

  lower_right_x_percent = options[:lower_right].first
  lower_right_y_percent = options[:lower_right].last

  original_width = analyzer.width(temp_object)
  original_height = analyzer.height(temp_object)

  upper_left_x = (original_width * upper_left_x_percent).round
  upper_left_y = (original_height * upper_left_y_percent).round
  frame_width = (original_width * (lower_right_x_percent - upper_left_x_percent)).round
  frame_height = (original_height * (lower_right_y_percent - upper_left_y_percent)).round

  if desired_width == 0 && frame_height > 0
    ratio = frame_width.to_f / frame_height
    desired_width = (desired_height * ratio).round
  end

  if desired_height == 0 && frame_width > 0
    ratio = frame_height.to_f / frame_width
    desired_height = (desired_width * ratio).round
  end


  convert(temp_object, "-crop #{frame_width}x#{frame_height}+#{upper_left_x}+#{upper_left_y} -resize #{desired_width}x#{desired_height} +repage", options[:format])
end

#flip(temp_object) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 162

def flip(temp_object)
  convert(temp_object, "-flip")
end

#flop(temp_object) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 166

def flop(temp_object)
  convert(temp_object, "-flop")
end

#generate_icon(temp_object, options = {}) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 224

def generate_icon(temp_object, options={})
  max_resolution = [options[:max_resolution] || 256, 256].min
  largest_png = convert(temp_object, "-resize #{max_resolution}x#{max_resolution}! -transparent white", :png)
  formats = []
  current = 16
  while current < max_resolution
    formats << convert(largest_png, "-resize #{current}x#{current}! -transparent white")
    current *= 2
  end
  formats << largest_png
  convert(formats, '', :ico)
end

#greyscale(temp_object) ⇒ Object Also known as: grayscale 



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# File 'lib/image_resizer/processor.rb', line 170

def greyscale(temp_object)
  convert(temp_object, "-colorspace Gray")
end

#resize(temp_object, options = {}) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 26

def resize(temp_object, options={})
  width = options[:width].to_i
  height = options[:height].to_i

  if height == 0 && width == 0
    temp_object.file
  elsif height == 0
    _resize(temp_object, "#{width}x", options[:format])
  elsif width == 0
    _resize(temp_object, "x#{height}", options[:format])
  else
    if options[:crop_from_top_if_portrait]
      analyzer = ImageResizer::Analyzer.new
      center_of_gravity = analyzer.aspect_ratio(temp_object) >= 1 ? 'c' : 'n'
    else
      center_of_gravity = 'c'
    end

    resize_and_crop(temp_object, :width => width.to_i, :height => height.to_i, :gravity => center_of_gravity, :format => options[:format])
  end
end

#resize_and_crop(temp_object, opts = {}) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 175

def resize_and_crop(temp_object, opts={})
  if !opts[:width] && !opts[:height]
    if opts[:format]
      return convert(temp_object, '', opts[:format])
    else
      return temp_object
    end
  elsif !opts[:width] || !opts[:height]
    attrs          = identify(temp_object)
    opts[:width]   ||= attrs[:width]
    opts[:height]  ||= attrs[:height]
  end

  opts[:gravity] ||= 'c'

  opts[:resize]  = "#{opts[:width]}x#{opts[:height]}^^"
  crop(temp_object, opts)
end

#resize_and_crop_around_point(temp_object, options) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 72

def resize_and_crop_around_point(temp_object, options)
  analyzer = ImageResizer::Analyzer.new

  desired_width = options[:width].to_i
  desired_height = options[:height].to_i
  desired_ratio = desired_height > 0 ? desired_width.to_f / desired_height : 0

  original_width = analyzer.width(temp_object)
  original_height = analyzer.height(temp_object)
  original_ratio = original_width.to_f / original_height

  if desired_ratio > original_ratio
    width = original_width
    height = width / desired_ratio
  else
    height = original_height
    width = height * desired_ratio
  end

  focus_x = options[:point][0] * original_width
  focus_y = options[:point][1] * original_height

  half_width = width * 0.5
  half_height = height * 0.5

  upper_left_x = [focus_x - half_width, 0].max
  upper_left_y = [focus_y - half_height, 0].max

  lower_right_x = upper_left_x + width
  lower_right_y = upper_left_y + height

  x_offset = [lower_right_x - original_width, 0].max
  y_offset = [lower_right_y - original_height, 0].max

  upper_left_x -= x_offset
  upper_left_y -= y_offset

  lower_right_x -= x_offset
  lower_right_y -= y_offset

  upper_left_x_percent = upper_left_x / original_width
  upper_left_y_percent = upper_left_y / original_height

  lower_right_x_percent = lower_right_x / original_width
  lower_right_y_percent = lower_right_y / original_height

  crop_to_frame_and_resize(temp_object,
                          :upper_left => [upper_left_x_percent, upper_left_y_percent],
                          :lower_right => [lower_right_x_percent, lower_right_y_percent],
                          :width => desired_width,
                          :height => desired_height,
                          :format => options[:format]
                          )
end

#rotate(temp_object, amount, opts = {}) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 194

def rotate(temp_object, amount, opts={})
  convert(temp_object, "-rotate '#{amount}#{opts[:qualifier]}'")
end

#strip(temp_object) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 198

def strip(temp_object)
  convert(temp_object, "-strip")
end

#thumb(temp_object, geometry) ⇒ Object 



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# File 'lib/image_resizer/processor.rb', line 202

def thumb(temp_object, geometry)
  case geometry
  when RESIZE_GEOMETRY
    resize(temp_object, geometry)
  when CROPPED_RESIZE_GEOMETRY
    resize_and_crop(temp_object, :width => $1, :height => $2, :gravity => $3)
  when CROP_GEOMETRY
    crop(temp_object,
      :width => $1,
      :height => $2,
      :x => $3,
      :y => $4,
      :gravity => $5
    )
  else raise ArgumentError, "Didn't recognise the geometry string #{geometry}"
  end
end