Class: Magick::Image

Inherits:
Object
  • Object
show all
Includes:
Plugin::Thumbnailer::ImageProcessing
Defined in:
lib/httpthumbnailer/plugin/thumbnailer.rb

Instance Method Summary collapse

Methods included from Plugin::Thumbnailer::ImageProcessing

#replace, #use

Instance Method Details

#downscale(f) ⇒ Object 



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# File 'lib/httpthumbnailer/plugin/thumbnailer.rb', line 429

def downscale(f)
  sample(columns / f, rows / f)
end

#find_downscale_factor(max_width, max_height, factor = 1) ⇒ Object 



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# File 'lib/httpthumbnailer/plugin/thumbnailer.rb', line 433

def find_downscale_factor(max_width, max_height, factor = 1)
  new_factor = factor * 2
  if columns / new_factor > max_width * 2 and rows / new_factor > max_height * 2
    find_downscale_factor(max_width, max_height, factor * 2)
  else
    factor
  end
end

#render_on_background(background_color, width = nil, height = nil) ⇒ Object 



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# File 'lib/httpthumbnailer/plugin/thumbnailer.rb', line 403

def render_on_background(background_color, width = nil, height = nil)
  Magick::Image.new(width || self.columns, height || self.rows) {
    begin
      self.background_color = background_color
    rescue ArgumentError
      raise Plugin::Thumbnailer::InvalidColorNameError.new(background_color)
    end
    self.depth = 8
  }.replace do |background|
    background.composite!(self, Magick::CenterGravity, Magick::OverCompositeOp)
  end
end

#resize_to_fill(ncols, nrows = nil, gravity = Magick::CenterGravity) ⇒ Object

non coping version



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# File 'lib/httpthumbnailer/plugin/thumbnailer.rb', line 417

def resize_to_fill(ncols, nrows = nil, gravity = Magick::CenterGravity)
  nrows ||= ncols
  if ncols != columns or nrows != rows
    scale = [ncols / columns.to_f, nrows / rows.to_f].max
    resize(scale * columns + 0.5, scale * rows + 0.5).replace do |image|
      image.crop(gravity, ncols, nrows, true) if ncols != columns or nrows != rows
    end
  else
    crop(gravity, ncols, nrows, true) if ncols != columns or nrows != rows
  end
end