Class: PhotoCook::Resizer

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/photo-cook/resizer.rb

Constant Summary collapse

CENTER_GRAVITY = 
'Center'.freeze
TRANSPARENT_BACKGROUND = 
'rgba(255,255,255,0.0)'.freeze

Instance Method Summary collapse

Instance Method Details

#resize(photo_path, width, height, pixel_ratio = 1.0, crop = false) ⇒ Object 



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# File 'lib/photo-cook/resizer.rb', line 8

def resize(photo_path, width, height, pixel_ratio = 1.0, crop = false)
  if crop
    resize_to_fill(photo_path, width, height, pixel_ratio)
  else
    resize_to_fit(photo_path, width, height, pixel_ratio)
  end
end

#resize_to_fill(photo_path, width, height, pixel_ratio) ⇒ Object

Resize the photo to fit within the specified dimensions:

  • new dimensions will be the same as specified

  • the photo will be cropped if necessary

github.com/carrierwaveuploader/carrierwave/blob/71cb18bba4a2078524d1ea683f267d3a97aa9bc8/lib/carrierwave/processing/mini_magick.rb#L176



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# File 'lib/photo-cook/resizer.rb', line 39

def resize_to_fill(photo_path, width, height, pixel_ratio)

  # Do nothing if photo is not valid so exceptions will be not thrown
  return unless (photo = open(photo_path)) && photo.valid?

  store_path      = assemble_store_path(photo_path, width, height, pixel_ratio, true)
  cols, rows      = photo[:dimensions]
  mwidth, mheight = multiply_dimensions(width, height, pixel_ratio)

  # TODO
  # Original dimensions are 1000x800. You want 640x640@1x. You will get 640x640
  # Original dimensions are 1000x800. You want 640x640@2x. You will get 800x800
  # Original dimensions are 1000x800. You want 640x640@3x. You will get 800x800
  # Original dimensions are 1000x800. You want 1280x1280@1x. You will get ?
  # Original dimensions are 1000x800. You want 1000x1280@1x. You will get ?

  photo.combine_options do |cmd|
    if width != cols || height != rows
      scale_x = width / cols.to_f
      scale_y = height / rows.to_f
      if scale_x >= scale_y
        cols = (scale_x * (cols + 0.5)).round
        rows = (scale_x * (rows + 0.5)).round
        cmd.resize "#{cols}>"
      else
        cols = (scale_y * (cols + 0.5)).round
        rows = (scale_y * (rows + 0.5)).round
        cmd.resize "x#{rows}>"
      end
    end
    cmd.gravity CENTER_GRAVITY
    cmd.background TRANSPARENT_BACKGROUND
    if cols != width || rows != height
      cmd.extent "#{literal_dimensions(width, height)}>"
    end
  end

  store(photo, store_path)
end

#resize_to_fit(photo_path, width, height, pixel_ratio) ⇒ Object

Resize the photo to fit within the specified dimensions:

  • the original aspect ratio will be kept

  • new dimensions will be not larger then the specified

github.com/carrierwaveuploader/carrierwave/blob/71cb18bba4a2078524d1ea683f267d3a97aa9bc8/lib/carrierwave/processing/mini_magick.rb#L131



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# File 'lib/photo-cook/resizer.rb', line 21

def resize_to_fit(photo_path, width, height, pixel_ratio)

  # Do nothing if photo is not valid so exceptions will be not thrown
  return unless (photo = open(photo_path)) && photo.valid?

  store_path    = assemble_store_path(photo_path, width, height, pixel_ratio, false)
  width, height = multiply_dimensions(width, height, pixel_ratio)

  photo.combine_options { |cmd| cmd.resize "#{literal_dimensions(width, height)}>" }

  store(photo, store_path)
end