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Contents
require 'chunky_png'
module Facades
module Helpers
##
# Misc helpers for front-end development.
#
module Frontend
def placeholder_image(*args)
@_placeholder_image_cache ||= ImageCache.new
options = args.extract_options!
image_tag(@_placeholder_image_cache.get(args), options)
end
##
# Caches placeholder image data based on
# a md5 hash.
#
class ImageCache
def get(args)
hash = ::Digest::MD5.hexdigest("#{args.join('|')}")
return cache[hash] if cache[hash].present?
width = args.shift
height = (args.shift || width)
color = (args.shift || '#cccccc')
text = args.shift
cache[hash] = generate_png(width, height, color, text)
end
private
def cache
@_cache ||= {}
end
##
# Generates an image based on the provided parameters.
#
#
def generate_png(width, height, color, text = nil)
color = color.sub(/^#/, '')
color = "#{color}#{color}" if color.size <= 3
color = ChunkyPNG::Color.from_hex("##{color}")
image = ChunkyPNG::Image.new(width, height, color)
image.to_data_url
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems