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475 lines
16 KiB
C#
475 lines
16 KiB
C#
//! \file ArcSWF.cs
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//! \date 2018 Sep 16
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//! \brief Shockwave Flash presentation.
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//
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// Copyright (C) 2018 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Linq;
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using System.Windows;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using GameRes.Compression;
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namespace GameRes.Formats.Macromedia
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{
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internal class SwfEntry : Entry
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{
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public SwfChunk Chunk;
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}
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internal class SwfSoundEntry : SwfEntry
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{
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public readonly List<SwfChunk> SoundStream = new List<SwfChunk>();
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}
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[Export(typeof(ArchiveFormat))]
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public class SwfOpener : ArchiveFormat
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{
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public override string Tag { get { return "SWF"; } }
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public override string Description { get { return "Shockeave Flash presentation"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public SwfOpener ()
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{
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Signatures = new uint[] { 0x08535743, 0 };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (0, "CWS") &&
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!file.View.AsciiEqual (0, "FWS"))
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return null;
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bool is_compressed = file.View.ReadByte (0) == 'C';
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int version = file.View.ReadByte (3);
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using (var reader = new SwfReader (file.CreateStream(), version, is_compressed))
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{
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var chunks = reader.Parse();
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var base_name = Path.GetFileNameWithoutExtension (file.Name);
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var dir = chunks.Where (t => t.Length > 2 && TypeMap.ContainsKey (t.Type))
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.Select (t => new SwfEntry {
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Name = string.Format ("{0}#{1:D5}", base_name, t.Id),
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Type = GetTypeFromId (t.Type),
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Chunk = t,
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Offset = 0,
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Size = (uint)t.Length
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} as Entry).ToList();
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SwfSoundEntry current_stream = null;
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foreach (var chunk in chunks.Where (t => IsSoundStream (t)))
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{
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switch (chunk.Type)
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{
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case Types.SoundStreamHead:
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case Types.SoundStreamHead2:
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if ((chunk.Data[1] & 0x30) != 0x20) // not mp3 stream
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{
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current_stream = null;
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continue;
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}
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current_stream = new SwfSoundEntry {
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Name = string.Format ("{0}#{1:D5}", base_name, chunk.Id),
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Type = "audio",
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Chunk = chunk,
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Offset = 0,
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};
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dir.Add (current_stream);
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break;
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case Types.SoundStreamBlock:
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if (current_stream != null)
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{
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current_stream.Size += (uint)(chunk.Data.Length - 4);
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current_stream.SoundStream.Add (chunk);
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}
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break;
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}
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}
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return new ArcFile (file, this, dir);
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}
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var swent = (SwfEntry)entry;
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Extractor extract;
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if (!ExtractMap.TryGetValue (swent.Chunk.Type, out extract))
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extract = ExtractChunk;
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return extract (swent);
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}
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static string GetTypeFromId (Types type_id)
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{
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string type;
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if (TypeMap.TryGetValue (type_id, out type))
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return type;
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return type_id.ToString();
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}
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static Stream ExtractChunk (SwfEntry entry)
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{
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return new BinMemoryStream (entry.Chunk.Data);
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}
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static Stream ExtractChunkContents (SwfEntry entry)
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{
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var source = entry.Chunk;
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return new BinMemoryStream (source.Data, 2, source.Length-2);
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}
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static Stream ExtractSoundStream (SwfEntry entry)
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{
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var swe = (SwfSoundEntry)entry;
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var output = new MemoryStream ((int)swe.Size);
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foreach (var chunk in swe.SoundStream)
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output.Write (chunk.Data, 4, chunk.Data.Length-4);
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output.Position = 0;
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return output;
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}
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static Stream ExtractAudio (SwfEntry entry)
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{
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var chunk = entry.Chunk;
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int flags = chunk.Data[2];
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int format = flags >> 4;
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if (2 == format)
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return new BinMemoryStream (chunk.Data, 9, chunk.Length-9);
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int sample_rate = (flags >> 2) & 3;
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int bits_per_sample = (flags & 2) != 0 ? 16 : 8;
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int channels = (flags & 1) + 1;
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return new BinMemoryStream (chunk.Data, 2, chunk.Length-2);
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}
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public override IImageDecoder OpenImage (ArcFile arc, Entry entry)
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{
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var swent = (SwfEntry)entry;
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switch (swent.Chunk.Type)
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{
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case Types.DefineBitsLossless:
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case Types.DefineBitsLossless2:
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return new LosslessImageDecoder (swent.Chunk);
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case Types.DefineBitsJpeg3:
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return new SwfJpeg3Decoder (swent.Chunk);
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default:
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return base.OpenImage (arc, entry);
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}
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}
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delegate Stream Extractor (SwfEntry entry);
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static Dictionary<Types, Extractor> ExtractMap = new Dictionary<Types, Extractor> {
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// { Types.DoAction, ExtractChunkContents },
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{ Types.DefineBitsJpeg, ExtractChunkContents },
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{ Types.DefineBitsLossless, ExtractChunk },
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{ Types.DefineBitsLossless2, ExtractChunk },
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{ Types.DefineSound, ExtractAudio },
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{ Types.SoundStreamHead, ExtractSoundStream },
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{ Types.SoundStreamHead2, ExtractSoundStream },
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};
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static Dictionary<Types, string> TypeMap = new Dictionary<Types, string> {
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{ Types.DefineBitsJpeg, "image" },
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{ Types.DefineBitsJpeg2, "DefineBitsJpeg2" },
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{ Types.DefineBitsJpeg3, "image" },
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{ Types.DefineBitsLossless, "image" },
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{ Types.DefineBitsLossless2, "image" },
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{ Types.DefineSound, "audio" },
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{ Types.DoAction, "" },
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};
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internal static bool IsSoundStream (SwfChunk chunk)
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{
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return chunk.Type == Types.SoundStreamHead
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|| chunk.Type == Types.SoundStreamHead2
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|| chunk.Type == Types.SoundStreamBlock;
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}
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}
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internal enum Types : short
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{
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End = 0,
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ShowFrame = 1,
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DefineShape = 2,
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DefineBitsJpeg = 6,
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DoAction = 12,
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DefineSound = 14,
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SoundStreamHead = 18,
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SoundStreamBlock = 19,
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DefineBitsLossless = 20,
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DefineBitsJpeg2 = 21,
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DefineBitsJpeg3 = 35,
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DefineBitsLossless2 = 36,
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DefineSprite = 39,
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SoundStreamHead2 = 45,
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ExportAssets = 56,
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VideoFrame = 61,
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FileAttributes = 69,
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Font3 = 75,
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DefineBinary = 87,
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};
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internal class SwfChunk
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{
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public Types Type;
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public byte[] Data;
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public int Length { get { return Data.Length; } }
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public int Id { get { return Data.Length > 2 ? Data.ToUInt16 (0) : -1; } }
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public SwfChunk (Types id, int length)
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{
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Type = id;
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Data = length > 0 ? new byte[length] : Array.Empty<byte>();
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}
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}
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internal sealed class SwfReader : IDisposable
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{
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IBinaryStream m_input;
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MsbBitStream m_bits;
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int m_version;
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Int32Rect m_dim;
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public SwfReader (IBinaryStream input, int version, bool is_compressed)
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{
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m_input = input;
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m_version = version;
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m_input.Position = 8;
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if (is_compressed)
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{
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var zstream = new ZLibStream (input.AsStream, CompressionMode.Decompress);
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m_input = new BinaryStream (zstream, m_input.Name);
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}
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m_bits = new MsbBitStream (m_input.AsStream, true);
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}
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int m_frame_rate;
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int m_frame_count;
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List<SwfChunk> m_chunks = new List<SwfChunk>();
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public List<SwfChunk> Parse ()
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{
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ReadDimensions();
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m_bits.Reset();
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m_frame_rate = m_input.ReadUInt16();
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m_frame_count = m_input.ReadUInt16();
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for (;;)
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{
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var chunk = ReadChunk();
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if (null == chunk)
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break;
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m_chunks.Add (chunk);
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}
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return m_chunks;
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}
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void ReadDimensions ()
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{
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int rsize = m_bits.GetBits (5);
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m_dim.X = GetSignedBits (rsize);
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m_dim.Y = GetSignedBits (rsize);
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m_dim.Width = GetSignedBits (rsize) - m_dim.X;
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m_dim.Height = GetSignedBits (rsize) - m_dim.Y;
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}
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byte[] m_buffer = new byte[4];
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SwfChunk ReadChunk ()
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{
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if (m_input.Read (m_buffer, 0, 2) != 2)
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return null;
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int length = m_buffer.ToUInt16 (0);
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Types id = (Types)(length >> 6);
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length &= 0x3F;
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if (0x3F == length)
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length = m_input.ReadInt32();
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if (Types.DefineSprite == id)
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length = 4;
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var chunk = new SwfChunk (id, length);
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if (length > 0)
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{
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if (m_input.Read (chunk.Data, 0, length) < length)
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return null;
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}
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return chunk;
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}
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int GetSignedBits (int count)
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{
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int v = m_bits.GetBits (count);
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if ((v >> (count - 1)) != 0)
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v |= -1 << count;
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return v;
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}
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#region IDisposable Members
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bool m_disposed = false;
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public void Dispose ()
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{
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if (!m_disposed)
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{
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m_input.Dispose();
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m_bits.Dispose();
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m_disposed = true;
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}
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}
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#endregion
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}
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internal sealed class LosslessImageDecoder : BinaryImageDecoder
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{
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Types m_type;
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int m_colors;
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int m_data_pos;
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public PixelFormat Format { get; private set; }
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private bool HasAlpha { get { return m_type == Types.DefineBitsLossless2; } }
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public LosslessImageDecoder (SwfChunk chunk) : base (new BinMemoryStream (chunk.Data))
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{
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m_type = chunk.Type;
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byte format = chunk.Data[2];
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int bpp;
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switch (format)
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{
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case 3:
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bpp = 8; Format = PixelFormats.Indexed8;
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break;
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case 4:
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bpp = 16; Format = PixelFormats.Bgr565;
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break;
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case 5:
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bpp = 32;
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Format = HasAlpha ? PixelFormats.Bgra32 : PixelFormats.Bgr32;
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break;
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default: throw new InvalidFormatException();
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}
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uint width = chunk.Data.ToUInt16 (3);
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uint height = chunk.Data.ToUInt16 (5);
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m_colors = 0;
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m_data_pos = 7;
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if (3 == format)
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m_colors = chunk.Data[m_data_pos++] + 1;
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Info = new ImageMetaData {
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Width = width, Height = height, BPP = bpp
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};
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}
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protected override ImageData GetImageData ()
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{
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m_input.Position = m_data_pos;
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using (var input = new ZLibStream (m_input.AsStream, CompressionMode.Decompress, true))
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{
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BitmapPalette palette = null;
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if (8 == Info.BPP)
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{
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var pal_format = HasAlpha ? PaletteFormat.RgbA : PaletteFormat.RgbX;
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palette = ImageFormat.ReadPalette (input, m_colors, pal_format);
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}
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var pixels = new byte[(int)Info.Width * (int)Info.Height * (Info.BPP / 8)];
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input.Read (pixels, 0, pixels.Length);
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if (32 == Info.BPP)
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{
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for (int i = 0; i < pixels.Length; i += 4)
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{
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byte a = pixels[i];
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pixels[i] = pixels[i+1];
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pixels[i+1] = pixels[i+2];
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pixels[i+2] = pixels[i+3];
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pixels[i+3] = a;
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}
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}
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return ImageData.Create (Info, Format, palette, pixels);
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}
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}
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}
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internal sealed class SwfJpeg3Decoder : IImageDecoder
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{
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byte[] m_input;
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ImageData m_image;
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int m_jpeg_length;
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public Stream Source { get { return Stream.Null; } }
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public ImageFormat SourceFormat { get { return null; } }
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public ImageMetaData Info { get; private set; }
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public PixelFormat Format { get; private set; }
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public ImageData Image { get { return m_image ?? (m_image = Unpack()); } }
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public SwfJpeg3Decoder (SwfChunk chunk)
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{
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m_input = chunk.Data;
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m_jpeg_length = m_input.ToInt32 (2);
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}
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ImageData Unpack ()
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{
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BitmapSource image;
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using (var jpeg = new BinMemoryStream (m_input, 6, m_jpeg_length))
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{
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var decoder = new JpegBitmapDecoder (jpeg, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
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image = decoder.Frames[0];
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}
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Info = new ImageMetaData {
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Width = (uint)image.PixelWidth,
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Height = (uint)image.PixelHeight,
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BPP = image.Format.BitsPerPixel,
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};
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byte[] alpha = new byte[image.PixelWidth * image.PixelHeight];
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using (var input = new BinMemoryStream (m_input, 6 + m_jpeg_length, m_input.Length - (6+m_jpeg_length)))
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using (var alpha_data = new ZLibStream (input, CompressionMode.Decompress))
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{
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alpha_data.Read (alpha, 0, alpha.Length);
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}
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if (image.Format.BitsPerPixel != 32)
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image = new FormatConvertedBitmap (image, PixelFormats.Bgr32, null, 0);
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int stride = image.PixelWidth * 4;
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var pixels = new byte[stride * image.PixelHeight];
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image.CopyPixels (pixels, stride, 0);
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ApplyAlpha (pixels, alpha);
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return ImageData.Create (Info, PixelFormats.Bgra32, null, pixels, stride);
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}
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void ApplyAlpha (byte[] pixels, byte[] alpha)
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{
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int src = 0;
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for (int dst = 3; dst < pixels.Length; dst += 4)
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{
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pixels[dst] = alpha[src++];
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}
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}
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public void Dispose ()
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{
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}
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}
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}
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