RGB image processing complete

lib/psd/file.coffee

@@ -38,3 +38,10 @@ module.exports = class File
   seek: (amt, rel = false) -> if rel then @pos += amt else @pos = amt
 
   readString: (length) -> @read(length).toString()
+  # readUInt: ->
+  #   @data.readUInt32(@pos)
+  #   @pos += 4
+
+  # readInt: ->
+  #   @data.readInt32(@pos)
+  #   @pos += 4
\ No newline at end of file

lib/psd/image.coffee

-module.exports = class Image
+{Module}    = require 'coffeescript-module'
+ImageFormat = require './image_format.coffee'
+ImageMode   = require './image_mode.coffee'
+
+module.exports = class Image extends Module
+  @includes ImageFormat.RAW
+  @includes ImageFormat.RLE
+  @includes ImageMode.RGB
+  
+  COMPRESSIONS = [
+    'Raw'
+    'RLE'
+    'ZIP'
+    'ZIPPrediction'
+  ]
+
   constructor: (@file, @header) ->
-    @width = @header.width
-    @height = @header.height
+    @numPixels = @width() * @height()
+    @numPixels *= 2 if @depth() is 16
+
+    @calculateLength()
+
+    @channelData = []
+    @pixelData = []
+    @opacity = 1.0
+    @hasMask = false
+
+    @startPos = @file.tell()
+    @endPos = @startPos + @length
+
+    @channelsInfo = [
+      {id: 0}
+      {id: 1}
+      {id: 2}
+    ]
+
+    @channelsInfo.push {id: -1} if @channels() is 4
+
+  for attr in ['width', 'height', 'channels', 'depth', 'mode'] then do (attr) =>
+    @::[attr] = -> @header[attr]
+
+  calculateLength: ->
+    @length = switch @depth()
+      when 1 then (@width() + 7) / 8 * @height()
+      when 16 then @width() * @height() * 2
+      else @width() * @height()
+
+    @channelLength = @length
+    @length *= @channels()
 
   parse: ->
-    console.log "parse!"
+    @compression = @parseCompression()
+
+    if @compression in [2, 3]
+      @file.seek @endPos
+      return
+
+    @parseImageData()
+
+  parseCompression: -> @file.readShort()
+    
+  parseImageData: ->
+    switch @compression
+      when 0 then @parseRaw()
+      when 1 then @parseRLE()
+      when 2, 3 then @parseZip()
+      else @file.seek(@endPos)
+
+    @processImageData()
+
+  processImageData: ->
+    switch @mode()
+      when 1 then @combineGreyscaleChannel()
+      when 3 then @combineRgbChannel()
+      when 4 then @combineCmykChannel()
 
+    @channelData = null
\ No newline at end of file

lib/psd/image_format.coffee

+module.exports =
+  RAW: require('./image_formats/raw.coffee')
+  RLE: require('./image_formats/rle.coffee')
\ No newline at end of file

lib/psd/image_formats/raw.coffee

+module.exports =
+  parseRaw: ->
+    @channelData = @file.read(@length)
\ No newline at end of file

lib/psd/image_formats/rle.coffee

+module.exports =
+  parseRLE: ->
+    @byteCounts = @parseByteCounts()
+    @parseChannelData()
+
+  parseByteCounts: ->
+    @file.readShort() for i in [0...(@channels() * @height())]
+
+  parseChannelData: ->
+    @chanPos = 0
+    @lineIndex = 0
+
+    for i in [0...@channels()]
+      @decodeRLEChannel()
+      @lineIndex += @height()
+
+  decodeRLEChannel: ->
+    for j in [0...@height()]
+      byteCount = @byteCounts[@lineIndex + j]
+      finish = @file.tell() + byteCount
+
+      while @file.tell() < finish
+        len = @file.read(1)[0]
+
+        if len < 128
+          len += 1
+          @channelData.splice @chanPos, 0, @file.read(len)...
+          @chanPos += len
+        else if len > 128
+          len ^= 0xff
+          len += 2
+
+          val = @file.read(1)[0]
+          @channelData[@chanPos++] = val for i in [0...len]
\ No newline at end of file

lib/psd/image_mode.coffee

+module.exports =
+  RGB: require('./image_modes/rgb.coffee')
\ No newline at end of file

lib/psd/image_modes/rgb.coffee

+module.exports =
+  combineRgbChannel: ->
+    rgbChannels = @channelsInfo
+      .map (ch) -> ch.id
+      .filter (ch) -> ch >= -1
+
+    for i in [0...@numPixels]
+      r = g = b = 0
+      a = 255
+
+      for chan, index in rgbChannels
+        val = @channelData[i + (@channelLength * index)]
+
+        switch chan
+          when -1 then a = val
+          when 0 then  r = val
+          when 1 then  g = val
+          when 2 then  b = val
+
+      @pixelData.push r, g, b, a
\ No newline at end of file

lib/psd/layer_mask.coffee

@@ -6,7 +6,7 @@ module.exports = class LayerMask
     @mergedAlpha = false
     @globalMask = null
 
-  skip: -> @file.seek @file.readInt()
+  skip: -> @file.seek @file.readInt(), true
 
   parse: ->
     maskSize = @file.readInt()

package.json

@@ -3,7 +3,8 @@
   "version": "0.0.1",
   "dependencies": {
     "coffee-script": "~ 1.7.1",
-    "jspack": "~ 0.0.3"
+    "jspack": "~ 0.0.3",
+    "coffeescript-module": "~ 0.0.2"
   },
   "devDependencies": {
     "coffeeify": "~ 0.6.0"