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|
module Compass
module SassExtensions
module Sprites
module SpriteMethods
# Changing this string will invalidate all previously generated sprite images.
# We should do so only when the packing algorithm changes
SPRITE_VERSION = "2"
# Calculates the overal image dimensions
# collects image sizes and input parameters for each sprite
# Calculates the height
def compute_image_metadata!
@width = 0
init_images
compute_image_positions!
init_engine
end
def init_engine
@engine = eval("::Compass::SassExtensions::Sprites::#{modulize}Engine.new(nil, nil, nil)")
@engine.width = @width
@engine.height = @height
@engine.images = @images
end
# Creates the Sprite::Image objects for each image and calculates the width
def init_images
@images = Images.new
image_names.each do |relative_file|
@images << Image.new(self, relative_file, kwargs)
end
unless sort_method == 'none'
@images.sort_by! sort_method
end
end
def name_and_hash
"#{path}-s#{uniqueness_hash}.png"
end
# The on-the-disk filename of the sprite
def filename
File.join(Compass.configuration.generated_images_path, name_and_hash)
end
def relativize(path)
Pathname.new(path).relative_path_from(Pathname.new(Dir.pwd)).to_s rescue path
end
# Generate a sprite image if necessary
def generate
if generation_required?
if kwargs.get_var('cleanup').value
cleanup_old_sprites
end
engine.construct_sprite
Compass.configuration.run_sprite_generated(engine.canvas)
save!
else
log :unchanged, filename
end
end
def cleanup_old_sprites
Sass::Util.glob(File.join(Compass.configuration.generated_images_path, "#{path}-s*.png")).each do |file|
log :remove, file
FileUtils.rm file
Compass.configuration.run_sprite_removed(file)
end
end
# Does this sprite need to be generated
def generation_required?
!File.exists?(filename) || outdated? || options[:force]
end
# Returns the uniqueness hash for this sprite object
def uniqueness_hash
@uniqueness_hash ||= begin
sum = Digest::MD5.new
sum << SPRITE_VERSION
sum << path
sum << layout
images.each do |image|
[:relative_file, :height, :width, :repeat, :spacing, :position, :digest].each do |attr|
sum << image.send(attr).to_s
end
end
sum.hexdigest[0...10]
end
@uniqueness_hash
end
# Saves the sprite engine
def save!
FileUtils.mkdir_p(File.dirname(filename))
saved = engine.save(filename)
log :create, filename
Compass.configuration.run_sprite_saved(filename)
@mtime = nil if saved
saved
end
# All the full-path filenames involved in this sprite
def image_filenames
@images.map(&:file)
end
# Checks whether this sprite is outdated
def outdated?
if File.exists?(filename)
return @images.any? {|image| image.mtime.to_i > self.mtime.to_i }
end
true
end
# Mtime of the sprite file
def mtime
@mtime ||= File.mtime(filename)
end
# Calculate the size of the sprite
def size
[width, height]
end
def log(action, filename, *extra)
if options[:compass] && options[:compass][:logger] && !options[:quiet]
options[:compass][:logger].record(action, relativize(filename), *extra)
end
end
end
end
end
end
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