forked from OpenNeo/impress
basic image thumbnails
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7c015e2d88
commit
cf2546d832
6 changed files with 65 additions and 16 deletions
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@ -14,6 +14,8 @@ class Outfit < ActiveRecord::Base
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scope :wardrobe_order, order('starred DESC', :name)
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mount_uploader :image, OutfitImageUploader
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after_commit :enqueue_image!
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def as_json(more_options={})
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serializable_hash :only => [:id, :name, :pet_state_id, :starred],
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@ -68,23 +70,35 @@ class Outfit < ActiveRecord::Base
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end
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# Returns the array of SwfAssets representing each layer of the output image,
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# ordered from bottom to top.
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def layered_assets
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visible_assets.sort { |a, b| a.zone.depth <=> b.zone.depth }
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# ordered from bottom to top. Careful: this method is memoized, so if the
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# image layers change after its first call we'll get bad results.
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def image_layers
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@image_layers ||= visible_assets_with_images.sort { |a, b| a.zone.depth <=> b.zone.depth }
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end
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# Creates and writes the thumbnail images for this outfit. (Writes to file in
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# development, S3 in production.) Runs #save! on the record, so any other
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# changes will also be saved.
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# Creates and writes the thumbnail images for this outfit iff the new image
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# would be different than the current one. (Writes to file in development,
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# S3 in production.) If the image is updated, updates the image layers hash
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# and runs #save! on the record, so any other changes will also be saved.
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def write_image!
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Tempfile.open(['outfit_image', '.png']) do |image|
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create_image! image
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self.image = image
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save!
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if image_layers_dirty?
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Tempfile.open(['outfit_image', '.png']) do |image|
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create_image! image
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self.image_layers_hash = generate_image_layers_hash
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self.image = image
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save!
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end
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end
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self.image
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end
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# Enqueue an image write iff the new image would be different than the
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# current one.
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def enqueue_image!
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Resque.enqueue(OutfitImageUpdate, id) if image_layers_dirty?
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end
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def s3_key(size)
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URI.encode("#{id}/#{size.join 'x'}.png")
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end
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@ -108,13 +122,13 @@ class Outfit < ActiveRecord::Base
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# Creates a 600x600 PNG image of this outfit, writing to the given output
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# file.
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def create_image!(output)
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layers = self.layered_assets
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base_layer = layers.shift
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base_layer = image_layers.first
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above_layers = image_layers[1..-1]
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write_temp_swf_asset_image! base_layer, output
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output.close
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Tempfile.open(['outfit_overlay', '.png']) do |overlay|
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layers.each do |layer|
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above_layers.each do |layer|
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overlay.open
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write_temp_swf_asset_image! layer, overlay
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overlay.close
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@ -151,6 +165,21 @@ class Outfit < ActiveRecord::Base
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all_assets.select { |a| (1 << (a.zone_id - 1)) & restricted_zones_mask == 0 }
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end
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def visible_assets_with_images
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visible_assets.select(&:has_image?)
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end
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# Generate 8-char hex digest representing visible image layers for this outfit.
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# Hash function should be decently collision-resistant.
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def generate_image_layers_hash
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@generated_image_layers_hash ||=
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Digest::MD5.hexdigest(image_layers.map(&:id).join(',')).first(8)
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end
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def image_layers_dirty?
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generate_image_layers_hash != self.image_layers_hash
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end
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IMAGE_BASE_SIZE = [600, 600]
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def write_temp_swf_asset_image!(swf_asset, file)
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key = swf_asset.s3_key(IMAGE_BASE_SIZE)
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8
app/models/outfit_image_update.rb
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8
app/models/outfit_image_update.rb
Normal file
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@ -0,0 +1,8 @@
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class OutfitImageUpdate
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@queue = :outfit_image_updates
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def self.perform(id)
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Outfit.find(id).write_image!
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end
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end
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@ -3,7 +3,7 @@
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# this to use S3 on all environments for those images only.)
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CarrierWave.configure do |config|
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if Rails.env.production? || true # REMOVE
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if Rails.env.production?
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s3_config = YAML.load_file Rails.root.join('config', 'aws_s3.yml')
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access_key_id = s3_config['access_key_id']
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secret_access_key = s3_config['secret_access_key']
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@ -0,0 +1,9 @@
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class AddImageLayersHashToOutfit < ActiveRecord::Migration
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def self.up
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add_column :outfits, :image_layers_hash, :string, :length => 8
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end
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def self.down
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remove_column :outfits, :image_layers_hash
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end
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end
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@ -10,7 +10,7 @@
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#
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# It's strongly recommended to check this file into your version control system.
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ActiveRecord::Schema.define(:version => 20120521164652) do
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ActiveRecord::Schema.define(:version => 20120716193946) do
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create_table "auth_servers", :force => true do |t|
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t.string "short_name", :limit => 10, :null => false
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@ -116,8 +116,9 @@ ActiveRecord::Schema.define(:version => 20120521164652) do
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t.datetime "created_at"
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t.datetime "updated_at"
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t.string "name"
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t.boolean "starred", :default => false, :null => false
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t.boolean "starred", :default => false, :null => false
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t.string "image"
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t.string "image_layers_hash"
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end
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add_index "outfits", ["pet_state_id"], :name => "index_outfits_on_pet_state_id"
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2
public/outfits/.gitignore
vendored
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2
public/outfits/.gitignore
vendored
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@ -0,0 +1,2 @@
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*
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!.gitignore
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