Start on channel image parsing

lib/psd/channel_image.coffee

+_ = require 'lodash'
+Image = require './image.coffee'
+
+module.exports = class ChannelImage extends Image
+  
+  constructor: (file, header, @layer) ->
+    @width = @layer.width
+    @height = @layer.height
+
+    super(file, header)
+
+    @channelsInfo = @layer.channelsInfo
+    @hasMask = _.any @channelsInfo, (c) -> c.id < -1
+    @opacity = @layer.opacity / 255.0
+    @maskData = []
+
+  skip: ->
+    for chan in @channelsInfo
+      @file.seek chan.length, true
+
+  channels: -> @layer.channels
+
+  parse: ->
+    @chanPos = 0
+    for chan in @channelsInfo
+      if chan.length <= 0
+        @parseCompression()
+        continue
+
+      @chan = chan
+
+      if chan.id < -1
+        @width = @layer.mask.width
+        @height = @layer.mask.height
+      else
+        @width = @layer.width
+        @height = @layer.height
+
+      @length = @width * @height
+      start = @file.tell()
+
+      @parseImageData()
+
+      finish = @file.tell()
+
+      if finish isnt start + @chan.length
+        @file.seek(start + @chan.length)
+
+    @width = @layer.width
+    @height = @layer.height
+
+    @processImageData()

lib/psd/layer.coffee

@@ -8,7 +8,7 @@ module.exports = class Layer extends Module
   @includes require('./layer/name.coffee')
   @includes require('./layer/info.coffee')
   @includes require('./layer/helpers.coffee')
-  # @includes require('./layer/channel_image.coffee')
+  @includes require('./layer/channel_image.coffee')
 
   constructor: (@file, @header) ->
     @mask = {}
@@ -53,4 +53,4 @@ module.exports = class Layer extends Module
     opacity: @opacity
     visible: @visible
     clipped: @clipped
-    mask: @mask.export()
+    mask: @mask.export()
\ No newline at end of file

lib/psd/layer/channel_image.coffee

+ChannelImage = require '../channel_image.coffee'
+
+module.exports =
+  parseChannelImage: ->
+    image = new ChannelImage(@file, @header, @)
+    @image = new LazyExecute(image, @file)
+      .now('skip')
+      .later('parse')
+      .get()

lib/psd/layer_mask.coffee

@@ -36,6 +36,8 @@ module.exports = class LayerMask
       for i in [0...layerCount]
         @layers.push new Layer(@file, @header).parse()
 
+      layer.parseChannelImage() for layer in @layers
+
   parseGlobalMask: ->
     length = @file.readInt()
     return if length <= 0
@@ -56,4 +58,4 @@ module.exports = class LayerMask
       # 0 = color selected, 1 = color protected, 128 = use value per layer
       mask.kind = @file.readByte()
 
-    @file.seek maskEnd
+    @file.seek maskEnd
\ No newline at end of file