Module: RetinaRails::Strategies::CarrierWave::Uploader::ClassMethods

Defined in:
lib/retina_rails/strategies/carrierwave.rb

Instance Method Summary collapse

Instance Method Details

#optimize_retina!(name, options = {}) ⇒ Object

Optimize version for retina displays

Parameters

name (Sym)

name of the version



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# File 'lib/retina_rails/strategies/carrierwave.rb', line 64

def optimize_retina!(name, options={})
  config = versions[name]
  options[:retina] = false

  processors = if config.respond_to?(:processors)
                 config.processors.dup
               else
                 config[:uploader].processors.dup
               end
  dimensions_processor = nil

  ## Check if there's a resize processor to get the dimensions
  processors.each do |p|
    dimensions_processor = processors.delete(p) if p[0].to_s.scan(/resize_to_fill|resize_to_limit|resize_to_fit|resize_and_pad/).any?
  end

  ## Define a retina version if processor is present
  if dimensions_processor
    dimensions = dimensions_processor[1].dup

    width  = dimensions[0] * 2
    height = dimensions[1] * 2

    2.times { dimensions.delete_at(0) }

    dimensions.insert(0, height)
    dimensions.insert(0, width)

    ## Reset the processors
    if config.respond_to?(:processors)
      config.processors = []
    else
      config[:uploader].processors = []
    end

    ## Override version with double height and width
    version name, options do
      process dimensions_processor[0] => dimensions

      quality_processor = nil

      ## Set other processors
      processors.each do |processor|
        process processor[0] => processor[1]

        quality_processor = true if processor[0] == :retina_quality
      end

      ## Set default quality if retina_quality is not defined
      process :retina_quality => 60 if quality_processor.nil?

      ## Store dimensions
      process :store_retina_dimensions
    end
  end
end

#version(name, options = {}, &block) ⇒ Object

Adds a new version to this uploader

Parameters

name (#to_sym)

name of the version

options (Hash)

optional options hash

&block (Proc)

a block to eval on this version of the uploader

Examples

class MyUploader < CarrierWave::Uploader::Base

  retina!

  version :thumb do
    process :resize_to_fill => [30, 30]
    process :retina_quality => 25
  end

  version :thumb, :retina => false do
    process :resize_to_fill => [30, 30]
  end

end



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# File 'lib/retina_rails/strategies/carrierwave.rb', line 51

def version(name, options={}, &block)
  super

  optimize_retina!(name, { :if => options[:if] }) unless options[:retina] == false
end