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begin
require 'oily_png'
rescue LoadError
require 'chunky_png'
end
module Compass
module SassExtensions
module Sprites
class ChunkyPngEngine < Compass::SassExtensions::Sprites::Engine
def construct_sprite
@canvas = ChunkyPNG::Image.new(width, height, ChunkyPNG::Color::TRANSPARENT)
images.each do |image|
input_png = begin
ChunkyPNG::Image.from_file(image.file)
rescue ChunkyPNG::SignatureMismatch
raise Compass::SpriteException, "You have provided a file that does not have a PNG signature. Only PNG files are supported by the default sprite engine"
end
canvas.replace! input_png, image.left, image.top
end
end
def save(filename)
if canvas.nil?
construct_sprite
end
canvas.save(filename, Compass.configuration.chunky_png_options)
end
end
end
end
end
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