internal DataStruct(int blockSize,Stream stream) { StreamHelper streamHelper = new StreamHelper(stream); _blockSize = (byte)blockSize; if (_blockSize > 0) { _data = streamHelper.ReadByte(_blockSize); } }
static void ReadImage(StreamHelper streamHelper, Stream fs, GifImage gifImage, List <GraphicEx> graphics, int frameCount) { ImageDescriptor imgDes = streamHelper.GetImageDescriptor(fs); GifFrame frame = new GifFrame(); frame.ImageDescriptor = imgDes; frame.LocalColorTable = gifImage.GlobalColorTable; if (imgDes.LctFlag) { frame.LocalColorTable = streamHelper.ReadByte(imgDes.LctSize * 3); } LZWDecoder lzwDecoder = new LZWDecoder(fs); int dataSize = streamHelper.Read(); frame.ColorDepth = dataSize; byte[] piexel = lzwDecoder.DecodeImageData(imgDes.Width, imgDes.Height, dataSize); frame.IndexedPixel = piexel; int blockSize = streamHelper.Read(); //DataStruct data = new DataStruct(blockSize, fs); new DataStruct(blockSize, fs); GraphicEx graphicEx = graphics[frameCount]; frame.GraphicExtension = graphicEx; frame.ColorBuffer = GetColorBufferFromPixel(piexel, frame.Palette, imgDes.InterlaceFlag, imgDes.Width, imgDes.Height); gifImage.Frames.Add(frame); }
internal DataStruct(int blockSize, Stream stream) { StreamHelper streamHelper = new StreamHelper(stream); _blockSize = (byte)blockSize; if (_blockSize > 0) { _data = streamHelper.ReadByte(_blockSize); } }
internal static GifImage Decode(Stream stream) { StreamHelper streamHelper = null; GifImage gifImage = new GifImage(); List <GraphicEx> graphics = new List <GraphicEx>(); int frameCount = 0; try { streamHelper = new StreamHelper(stream); //读取文件头 gifImage.Header = streamHelper.ReadString(6); //读取逻辑屏幕标示符 gifImage.LogicalScreenDescriptor = streamHelper.GetLCD(stream); if (gifImage.LogicalScreenDescriptor.GlobalColorTableFlag) { //读取全局颜色列表 gifImage.GlobalColorTable = streamHelper.ReadByte(gifImage.LogicalScreenDescriptor.GlobalColorTableSize * 3); } int nextFlag = streamHelper.Read(); while (nextFlag != 0) { if (nextFlag == GifExtensions.ImageLabel) { ReadImage(streamHelper, stream, gifImage, graphics, frameCount); frameCount++; } else if (nextFlag == GifExtensions.ExtensionIntroducer) { int gcl = streamHelper.Read(); switch (gcl) { case GifExtensions.GraphicControlLabel: { GraphicEx graphicEx = streamHelper.GetGraphicControlExtension(stream); graphics.Add(graphicEx); break; } case GifExtensions.CommentLabel: { CommentEx comment = streamHelper.GetCommentEx(stream); gifImage.CommentExtensions.Add(comment); break; } case GifExtensions.ApplicationExtensionLabel: { ApplicationEx applicationEx = streamHelper.GetApplicationEx(stream); gifImage.ApplictionExtensions.Add(applicationEx); break; } case GifExtensions.PlainTextLabel: { PlainTextEx textEx = streamHelper.GetPlainTextEx(stream); gifImage.PlainTextEntensions.Add(textEx); break; } } } else if (nextFlag == GifExtensions.EndIntroducer) { //到了文件尾 break; } nextFlag = streamHelper.Read(); } gifImage.Texture = new Texture2D(gifImage.Width, gifImage.Height, TextureFormat.ARGB32, false); } catch { throw; } finally { stream.Close(); } return(gifImage); }
/// <summary> /// ��gifͼ���ļ����н��� /// </summary> /// <param name="gifPath">gif�ļ�·��</param> internal static GifImage Decode(string gifPath) { FileStream fs=null; StreamHelper streamHelper=null; GifImage gifImage = new GifImage(); List<GraphicEx> graphics = new List<GraphicEx>(); int frameCount = 0; try { fs = new FileStream(gifPath,FileMode.Open); streamHelper = new StreamHelper(fs); //��ȡ�ļ�ͷ gifImage.Header = streamHelper.ReadString(6); //��ȡ����Ļ��ʾ�� gifImage.LogicalScreenDescriptor = streamHelper.GetLCD(fs); if (gifImage.LogicalScreenDescriptor.GlobalColorTableFlag) { //��ȡȫ����ɫ�б� gifImage.GlobalColorTable = streamHelper.ReadByte(gifImage.LogicalScreenDescriptor.GlobalColorTableSize * 3); } int nextFlag = streamHelper.Read(); while (nextFlag != 0) { if (nextFlag == GifExtensions.ImageLabel) { ReadImage(streamHelper, fs, gifImage, graphics, frameCount); frameCount++; } else if (nextFlag == GifExtensions.ExtensionIntroducer) { int gcl = streamHelper.Read(); switch (gcl) { case GifExtensions.GraphicControlLabel: { GraphicEx graphicEx = streamHelper.GetGraphicControlExtension(fs); graphics.Add(graphicEx); break; } case GifExtensions.CommentLabel: { CommentEx comment = streamHelper.GetCommentEx(fs); gifImage.CommentExtensions.Add(comment); break; } case GifExtensions.ApplicationExtensionLabel: { ApplicationEx applicationEx = streamHelper.GetApplicationEx(fs); gifImage.ApplictionExtensions.Add(applicationEx); break; } case GifExtensions.PlainTextLabel: { PlainTextEx textEx = streamHelper.GetPlainTextEx(fs); gifImage.PlainTextEntensions.Add(textEx); break; } } } else if (nextFlag == GifExtensions.EndIntroducer) { //�����ļ�β break; } nextFlag = streamHelper.Read(); } } catch { throw; } finally { fs.Close(); } return gifImage; }
static void ReadImage(StreamHelper streamHelper, Stream fs, GifImage gifImage, List<GraphicEx> graphics, int frameCount) { ImageDescriptor imgDes = streamHelper.GetImageDescriptor(fs); GifFrame frame = new GifFrame(); frame.ImageDescriptor = imgDes; frame.LocalColorTable = gifImage.GlobalColorTable; if (imgDes.LctFlag) { frame.LocalColorTable = streamHelper.ReadByte(imgDes.LctSize*3); } LZWDecoder lzwDecoder = new LZWDecoder(fs); int dataSize = streamHelper.Read(); frame.ColorDepth = dataSize; byte[] piexel = lzwDecoder.DecodeImageData(imgDes.Width, imgDes.Height, dataSize); frame.IndexedPixel = piexel; int blockSize = streamHelper.Read(); DataStruct data = new DataStruct(blockSize, fs); GraphicEx graphicEx = graphics[frameCount]; frame.GraphicExtension = graphicEx; Bitmap img = GetImageFromPixel(piexel, frame.Palette, imgDes.InterlaceFlag, imgDes.Width, imgDes.Height); frame.Image = img; gifImage.Frames.Add(frame); }
/// <summary> /// 对gif图像文件进行解码 /// </summary> /// <param name="gifPath">gif文件路径</param> public static GifImage Decode(string gifPath) { FileStream fs = null; StreamHelper streamHelper = null; GifImage gifImage = new GifImage(); List <GraphicEx> graphics = new List <GraphicEx>(); int frameCount = 0; // try // { fs = new FileStream(gifPath, FileMode.Open); streamHelper = new StreamHelper(fs); //读取文件头 gifImage.Header = streamHelper.ReadString(6); //读取逻辑屏幕标示符 gifImage.LogicalScreenDescriptor = streamHelper.GetLCD(fs); if (gifImage.LogicalScreenDescriptor.GlobalColorTableFlag) { //读取全局颜色列表 gifImage.GlobalColorTable = streamHelper.ReadByte(gifImage.LogicalScreenDescriptor.GlobalColorTableSize * 3); } int nextFlag = streamHelper.Read(); while (nextFlag != 0) { if (nextFlag == GifExtensions.ImageLabel) { ReadImage(streamHelper, fs, gifImage, graphics, frameCount); frameCount++; } else if (nextFlag == GifExtensions.ExtensionIntroducer) { int gcl = streamHelper.Read(); switch (gcl) { case GifExtensions.GraphicControlLabel: { GraphicEx graphicEx = streamHelper.GetGraphicControlExtension(fs); graphics.Add(graphicEx); break; } case GifExtensions.CommentLabel: { CommentEx comment = streamHelper.GetCommentEx(fs); gifImage.CommentExtensions.Add(comment); break; } case GifExtensions.ApplicationExtensionLabel: { ApplicationEx applicationEx = streamHelper.GetApplicationEx(fs); gifImage.ApplictionExtensions.Add(applicationEx); break; } case GifExtensions.PlainTextLabel: { PlainTextEx textEx = streamHelper.GetPlainTextEx(fs); gifImage.PlainTextEntensions.Add(textEx); break; } } } else if (nextFlag == GifExtensions.EndIntroducer) { //到了文件尾 break; } nextFlag = streamHelper.Read(); } // } // catch // { // throw; // } // finally // { fs.Close(); // } return(gifImage); }