97 lines
3.3 KiB
C#
97 lines
3.3 KiB
C#
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/////////////////////////////////////////////////////////////////////////////////
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//
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// Photoshop PSD FileType Plugin for Paint.NET
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// http://psdplugin.codeplex.com/
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//
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// This software is provided under the MIT License:
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// Copyright (c) 2006-2007 Frank Blumenberg
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// Copyright (c) 2010-2016 Tao Yue
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//
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// See LICENSE.txt for complete licensing and attribution information.
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//
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/////////////////////////////////////////////////////////////////////////////////
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using System;
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using System.IO.Compression;
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using PDNWrapper;
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namespace PhotoshopFile.Compression
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{
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internal static class ImageDataFactory
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{
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/// <summary>
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/// Creates an ImageData object to compress or decompress image data.
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/// </summary>
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/// <param name="channel">The Channel associated with the image data.</param>
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/// <param name="data">The image data to be decompressed, or null if
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/// image data is to be compressed.</param>
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public static ImageData Create(Channel channel, byte[] data)
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{
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var bitDepth = channel.Layer.PsdFile.BitDepth;
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ImageData imageData;
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switch (channel.ImageCompression)
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{
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case ImageCompression.Raw:
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imageData = new RawImage(data, channel.Rect.Size, bitDepth);
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break;
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case ImageCompression.Rle:
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imageData = new RleImage(data, channel.RleRowLengths,
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channel.Rect.Size, bitDepth);
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break;
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case ImageCompression.Zip:
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// Photoshop treats 32-bit Zip as 32-bit ZipPrediction
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imageData = (bitDepth == 32)
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? CreateZipPredict(data, channel.Rect.Size, bitDepth)
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: new ZipImage(data, channel.Rect.Size, bitDepth);
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break;
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case ImageCompression.ZipPrediction:
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imageData = CreateZipPredict(data, channel.Rect.Size, bitDepth);
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break;
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default:
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throw new PsdInvalidException("Unknown image compression method.");
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}
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// Reverse endianness of multi-byte image data
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imageData = WrapEndianness(imageData);
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return imageData;
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}
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private static ImageData CreateZipPredict(byte[] data, Size size,
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int bitDepth)
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{
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switch (bitDepth)
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{
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case 16:
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return new ZipPredict16Image(data, size);
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case 32:
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return new ZipPredict32Image(data, size);
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default:
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throw new PsdInvalidException(
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"ZIP with prediction is only available for 16 and 32 bit depths.");
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}
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}
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private static ImageData WrapEndianness(ImageData imageData)
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{
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// Single-byte image does not require endianness reversal
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if (imageData.BitDepth <= 8)
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{
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return imageData;
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}
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// Bytes will be reordered by the compressor, so no wrapper is needed
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if ((imageData is ZipPredict16Image) || (imageData is ZipPredict32Image))
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{
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return imageData;
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}
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return new EndianReverser(imageData);
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}
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}
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}
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