コード例 #1
0
ファイル: Gif.cs プロジェクト: Banane9/SharpGif
        public void WriteToStream(Stream stream)
        {
            Header.WriteToStream(stream);
            LogicalScreenDescriptor.WriteToStream(stream);

            if (LogicalScreenDescriptor.HasGlobalColorTable)
            {
                GlobalColorTable.WriteToStream(stream);
            }

            foreach (var frame in Frames)
            {
                frame.WriteToStream(stream);
            }

            stream.WriteByte(trailer);
        }
コード例 #2
0
        /// <summary>
        /// Populates the global color table byte[] from the source image, and performs lexical parsing on the array.
        /// </summary>
        /// <param name="bytes"></param>
        public static GlobalColorTable ParseGlobalColorTable(byte[] bytes)
        {
            GlobalColorTable gct = new GlobalColorTable()
            {
                TotalBlockLength   = bytes.Length,
                Bytes              = (byte[])bytes.Clone(),
                DistinctColorCount = bytes.Length / 3
            };

            for (int i = 0; i <= bytes.Length - 3; i += 3)
            {
                gct.Colors.Add(new byte[3] {
                    bytes[i], bytes[i + 1], bytes[i + 2]
                });
            }

            return(gct);
        }
コード例 #3
0
ファイル: GIF.cs プロジェクト: ewxrjk/Defect
        private void WriteLogicalScreenDescriptor()
        {
            if (Debug)
            {
                Console.Error.WriteLine("Writing logical screen descriptor");
            }
            WriteShort(ScreenWidth);
            WriteShort(ScreenHeight);
            int packedFields = 0;

            if (GlobalColorTable != null)
            {
                packedFields |= 128 | (GlobalColorTable.BitSize() - 1);
                if (GlobalColorTable.Ordered)
                {
                    packedFields |= 8;
                }
            }
            packedFields |= (ColorResolution - 1) << 4;
            WriteByte(packedFields);
            if (GlobalColorTable != null)
            {
                WriteByte(GlobalColorTable.BackgroundColorIndex);
            }
            else
            {
                WriteByte(0);
            }
            if (PixelAspectRatio != 0)
            {
                WriteByte((int)(64 * PixelAspectRatio - 15));
            }
            else
            {
                WriteByte(0);
            }
        }
コード例 #4
0
        private void Read(BinaryReader br)
        {
            ReadSignature(br);
            ReadVersion(br);
            ReadScreenConfig(br);
            ReadGlobalColorTable(br);
            ReadBackgroundColorIndex(br);
            ReadAspectRatio(br);

            GlobalColorTable?.ReadTable(br);

            GraphicsControlExtensionBlock gcb = null;

            do
            {
                var b = br.ReadByte();
                if (b == 0x2C)
                {
                    var frame = new GifFrame {
                        ControlExtension = gcb
                    };
                    frame.Read(br);
                    gcb = null;
                    Frames.Add(frame);
                }
                else if (b == 0x21)
                {
                    var label = br.ReadByte();
                    if (label == 0xF9)
                    {
                        gcb = new GraphicsControlExtensionBlock(br);
                    }
                    else if (label == 0x01)
                    {
                        var frame = new GifFrame {
                            PlainTextExtension = new PlainTextExtensionBlock(br),
                            ControlExtension   = gcb
                        };
                        gcb = null;
                        Frames.Add(frame);
                    }
                    else if (label == 0xFF)
                    {
                        ApplicationExtensionBlocks.Add(new ApplicationExtensionBlock(br));
                    }
                    else if (label == 0xFE)
                    {
                        CommentExtensionBlocks.Add(new CommentExtensionBlock(br));
                    }
                    else
                    {
                        throw new GifDecodingException($"Unknown extension label {label:X2}");
                    }
                }
                else if (b == 0x3B)
                {
                    break;
                }
                else
                {
                    throw new GifDecodingException($"Unknown separator {b:X2}");
                }
            } while (true);
        }
コード例 #5
0
 public GlobalColorTableMangler(ref VcvjImage vcvjImage)
 {
     VcvjImage        = vcvjImage;
     GlobalColorTable = VcvjImage.DataStream.LogicalScreen.GlobalColorTable;
 }