Exemplo n.º 1
0
        public PsdFile Load(Stream stream)
        {
            //binary reverse reader reads data types in big-endian format.
            BinaryReverseReader reader = new BinaryReverseReader(stream);

            #region "Headers"
            //The headers area is used to check for a valid PSD file
            Debug.WriteLine("LoadHeader started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

            String signature = new String(reader.ReadChars(4));
            if (signature != "8BPS")
            {
                throw new IOException("Bad or invalid file stream supplied");
            }

            //get the version number, should be 1 always
            if ((Version = reader.ReadInt16()) != 1)
            {
                throw new IOException("Invalid version number supplied");
            }

            //get rid of the 6 bytes reserverd in PSD format
            reader.BaseStream.Position += 6;

            //get the rest of the information from the PSD file.
            //Everytime ReadInt16() is called, it reads 2 bytes.
            //Everytime ReadInt32() is called, it reads 4 bytes.
            _channels = reader.ReadInt16();
            _rows     = reader.ReadInt32();
            _columns  = reader.ReadInt32();
            _depth    = reader.ReadInt16();
            ColorMode = (ColorModes)reader.ReadInt16();

            //by end of headers, the reader has read 26 bytes into the file.
            #endregion             //End Headers

            #region "ColorModeData"
            Debug.WriteLine("LoadColorModeData started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

            UInt32 paletteLength = reader.ReadUInt32();             //readUint32() advances the reader 4 bytes.
            if (paletteLength > 0)
            {
                ColorModeData = reader.ReadBytes((Int32)paletteLength);
            }
            #endregion             //End ColorModeData


            #region "Loading Image Resources"
            //This part takes extensive use of classes that I didn't write therefore
            //I can't document much on what they do.

            Debug.WriteLine("LoadingImageResources started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

            _imageResources.Clear();

            UInt32 imgResLength = reader.ReadUInt32();
            if (imgResLength <= 0)
            {
                return(null);
            }

            Int64 startPosition = reader.BaseStream.Position;

            while ((reader.BaseStream.Position - startPosition) < imgResLength)
            {
                ImageResource imgRes = new ImageResource(reader);

                ResourceIDs resID = (ResourceIDs)imgRes.ID;
                switch (resID)
                {
                case ResourceIDs.ResolutionInfo:
                    imgRes = new ResolutionInfo(imgRes);
                    break;

                case ResourceIDs.Thumbnail1:
                case ResourceIDs.Thumbnail2:
                    imgRes = new Thumbnail(imgRes);
                    break;

                case ResourceIDs.AlphaChannelNames:
                    imgRes = new AlphaChannels(imgRes);
                    break;
                }

                _imageResources.Add(imgRes);
            }
            // make sure we are not on a wrong offset, so set the stream position
            // manually
            reader.BaseStream.Position = startPosition + imgResLength;

            #endregion             //End LoadingImageResources


            #region "Layer and Mask Info"
            //We are gonna load up all the layers and masking of the PSD now.
            Debug.WriteLine("LoadLayerAndMaskInfo - Part1 started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));
            UInt32 layersAndMaskLength = reader.ReadUInt32();

            if (layersAndMaskLength <= 0)
            {
                return(null);
            }

            //new start position
            startPosition = reader.BaseStream.Position;

            //Lets start by loading up all the layers
            LoadLayers(reader);
            //we are done the layers, load up the masks
            LoadGlobalLayerMask(reader);

            // make sure we are not on a wrong offset, so set the stream position
            // manually
            reader.BaseStream.Position = startPosition + layersAndMaskLength;
            #endregion             //End Layer and Mask info

            #region "Loading Final Image"

            //we have loaded up all the information from the PSD file
            //into variables we can use later on.

            //lets finish loading the raw data that defines the image
            //in the picture.

            Debug.WriteLine("LoadImage started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

            ImageCompression = (ImageCompression)reader.ReadInt16();

            ImageData = new Byte[_channels][];

            //---------------------------------------------------------------

            if (ImageCompression == ImageCompression.Rle)
            {
                // The RLE-compressed data is proceeded by a 2-byte data count for each row in the data,
                // which we're going to just skip.
                reader.BaseStream.Position += _rows * _channels * 2;
            }

            //---------------------------------------------------------------

            Int32 bytesPerRow = 0;

            switch (_depth)
            {
            case 1:
                bytesPerRow = _columns;                        //NOT Shure
                break;

            case 8:
                bytesPerRow = _columns;
                break;

            case 16:
                bytesPerRow = _columns * 2;
                break;
            }

            //---------------------------------------------------------------

            for (Int32 ch = 0; ch < _channels; ch++)
            {
                ImageData[ch] = new Byte[_rows * bytesPerRow];

                switch (ImageCompression)
                {
                case ImageCompression.Raw:
                    reader.Read(ImageData[ch], 0, ImageData[ch].Length);
                    break;

                case ImageCompression.Rle:
                {
                    for (Int32 i = 0; i < _rows; i++)
                    {
                        Int32 rowIndex = i * _columns;
                        RleHelper.DecodedRow(reader.BaseStream, ImageData[ch], rowIndex, bytesPerRow);
                    }
                }
                break;
                }
            }

            #endregion             //End LoadingFinalImage

            return(this);
        }         //end Load()
Exemplo n.º 2
0
        public PsdFile Load(String filename)
		{
			using (FileStream stream = new FileStream(filename, FileMode.Open))
			{
				//binary reverse reader reads data types in big-endian format.
				BinaryReverseReader reader = new BinaryReverseReader(stream);

				#region "Headers"
				//The headers area is used to check for a valid PSD file
				Debug.WriteLine("LoadHeader started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

				String signature = new String(reader.ReadChars(4));
				if (signature != "8BPS") throw new IOException("Bad or invalid file stream supplied");

				//get the version number, should be 1 always
				if ((Version = reader.ReadInt16()) != 1) throw new IOException("Invalid version number supplied");

				//get rid of the 6 bytes reserverd in PSD format
				reader.BaseStream.Position += 6;

				//get the rest of the information from the PSD file.
				//Everytime ReadInt16() is called, it reads 2 bytes.
				//Everytime ReadInt32() is called, it reads 4 bytes.
				_channels = reader.ReadInt16();
				_rows = reader.ReadInt32();
				_columns = reader.ReadInt32();
				_depth = reader.ReadInt16();
				ColorMode = (ColorModes)reader.ReadInt16();

				//by end of headers, the reader has read 26 bytes into the file.
				#endregion //End Headers

				#region "ColorModeData"
				Debug.WriteLine("LoadColorModeData started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

				UInt32 paletteLength = reader.ReadUInt32(); //readUint32() advances the reader 4 bytes.
				if (paletteLength > 0)
				{
					ColorModeData = reader.ReadBytes((Int32)paletteLength);
				}
				#endregion //End ColorModeData


				#region "Loading Image Resources"
				//This part takes extensive use of classes that I didn't write therefore
				//I can't document much on what they do.

				Debug.WriteLine("LoadingImageResources started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

                _imageResources.Clear();

				UInt32 imgResLength = reader.ReadUInt32();
				if (imgResLength <= 0) return null;

				Int64 startPosition = reader.BaseStream.Position;

				while ((reader.BaseStream.Position - startPosition) < imgResLength)
				{
					ImageResource imgRes = new ImageResource(reader);

					ResourceIDs resID = (ResourceIDs)imgRes.ID;
					switch (resID)
					{
						case ResourceIDs.ResolutionInfo:
							imgRes = new ResolutionInfo(imgRes);
							break;
						case ResourceIDs.Thumbnail1:
						case ResourceIDs.Thumbnail2:
							imgRes = new Thumbnail(imgRes);
							break;
						case ResourceIDs.AlphaChannelNames:
							imgRes = new AlphaChannels(imgRes);
							break;
					}

                    _imageResources.Add(imgRes);

				}
				// make sure we are not on a wrong offset, so set the stream position 
				// manually
				reader.BaseStream.Position = startPosition + imgResLength;

				#endregion //End LoadingImageResources


				#region "Layer and Mask Info"
				//We are gonna load up all the layers and masking of the PSD now.
				Debug.WriteLine("LoadLayerAndMaskInfo - Part1 started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));
				UInt32 layersAndMaskLength = reader.ReadUInt32();

				if (layersAndMaskLength <= 0) return null;

				//new start position
				startPosition = reader.BaseStream.Position;

				//Lets start by loading up all the layers
				LoadLayers(reader);
				//we are done the layers, load up the masks
				LoadGlobalLayerMask(reader);

				// make sure we are not on a wrong offset, so set the stream position 
				// manually
				reader.BaseStream.Position = startPosition + layersAndMaskLength;
				#endregion //End Layer and Mask info

				#region "Loading Final Image"

				//we have loaded up all the information from the PSD file
				//into variables we can use later on.

				//lets finish loading the raw data that defines the image 
				//in the picture.

				Debug.WriteLine("LoadImage started at " + reader.BaseStream.Position.ToString(CultureInfo.InvariantCulture));

				ImageCompression = (ImageCompression)reader.ReadInt16();

				ImageData = new Byte[_channels][];

				//---------------------------------------------------------------

				if (ImageCompression == ImageCompression.Rle)
				{
					// The RLE-compressed data is proceeded by a 2-byte data count for each row in the data,
					// which we're going to just skip.
					reader.BaseStream.Position += _rows * _channels * 2;
				}

				//---------------------------------------------------------------

				Int32 bytesPerRow = 0;

				switch (_depth)
				{
					case 1:
						bytesPerRow = _columns;//NOT Shure
						break;
					case 8:
						bytesPerRow = _columns;
						break;
					case 16:
						bytesPerRow = _columns * 2;
						break;
				}

				//---------------------------------------------------------------

				for (Int32 ch = 0; ch < _channels; ch++)
				{
					ImageData[ch] = new Byte[_rows * bytesPerRow];

					switch (ImageCompression)
					{
						case ImageCompression.Raw:
							reader.Read(ImageData[ch], 0, ImageData[ch].Length);
							break;
						case ImageCompression.Rle:
							{
								for (Int32 i = 0; i < _rows; i++)
								{
									Int32 rowIndex = i * _columns;
									RleHelper.DecodedRow(reader.BaseStream, ImageData[ch], rowIndex, bytesPerRow);
								}
							}
							break;
					}
				}

				#endregion //End LoadingFinalImage
			}

            return this;
		} //end Load()