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refactored engine to be a class and turned on best compression for chunky_png

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This commit is contained in:
Scott Davis 2011-06-12 01:35:19 -04:00
parent 6f95c9d17a
commit b6cf4f5213
1 changed files with 13 additions and 7 deletions
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18
lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb
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@ -7,20 +7,19 @@ end
module Compass
module SassExtensions
module Sprites
module ChunkyPngEngine
class ChunkyPngEngine < Compass::SassExtensions::Sprites::Engine
# Returns a PNG object
def construct_sprite
output_png = ChunkyPNG::Image.new(width, height, ChunkyPNG::Color::TRANSPARENT)
@canvas = ChunkyPNG::Image.new(width, height, ChunkyPNG::Color::TRANSPARENT)
images.each do |image|
input_png = ChunkyPNG::Image.from_file(image.file)
if image.repeat == "no-repeat"
output_png.replace! input_png, image.left, image.top
canvas.replace! input_png, image.left, image.top
else
x = image.left - (image.left / image.width).ceil * image.width
while x < width do
begin
output_png.replace! input_png, x, image.top
canvas.replace! input_png, x, image.top
x += image.width
rescue ChunkyPNG::OutOfBounds
break;
@ -28,8 +27,15 @@ module Compass
end
end
end
output_png
end
def save(filename)
if canvas.nil?
construct_sprite
end
canvas.save(filename, :best_compression)
end
end
end
end