TextureManager proof-of-concept with Q written in CoffeeScript

gistfile1.coffee

class TextureManager
  constructor: ->
    @textures = {}

  load: (texture, callback) ->
    texture = [texture] unless Array.isArray texture
    textures = @textures

    promises = for t in texture
      (cb) ->
        image = new Image()
        image.src = t
        image.onload = ->
          # TODO: Normalize path
          textures[t] = new Texture image
          cb()

    Q.allSettled(promises).then(callback)

class Texture
  constructor: (image, pixelData = null) ->
    {@width, @height} = image
    @name = image.src

    if pixelData?
      @pixels = pixelData
    else
      canvas = document.createElement 'canvas' 
      context = canvas.getContext '2d'
 
      canvas.width = @width
      canvas.height = @height
 
      context.drawImage context, 0, 0
 
      imageData = canvas.getImageData 0, 0, @width, @height
 
      @pixels = []
      for y in [0..width]
        for x in [0..height]
          @pixels[x] or= []
          @pixels[x][y] = 
            r: imageData.data[x * y]
            g: imageData.data[x * y + 1]
            b: imageData.data[x * y + 2]
            a: imageData.data[x * y + 3]