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# rle.coffee

lib/psd/image_formats/

¶

    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]

generated Tue May 12 2015 10:08:55 GMT-0400 (EDT)