GetImageDescriptor() приватный Метод

从文件数据流中读取 图象标识符(Image Descriptor)
private GetImageDescriptor ( Stream stream ) : ImageDescriptor
stream Stream
Результат ImageDescriptor
Документация по классу StreamHelper
Пример #1
0
        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);
        }
Пример #2
0
 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);
 }