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123 lines
4 KiB
C#
123 lines
4 KiB
C#
#region License Information (GPL v3)
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/*
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ShareX - A program that allows you to take screenshots and share any file type
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Copyright (C) 2008-2013 ShareX Developers
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Optionally you can also view the license at <http://www.gnu.org/licenses/>.
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*/
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#endregion License Information (GPL v3)
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using System;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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namespace HelpersLib
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{
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public class AnimatedGif : IDisposable
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{
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private byte[] buf1, buf2, buf3;
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private MemoryStream gifStream;
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private BinaryWriter binaryWriter;
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private int frameNum;
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public AnimatedGif(int delay, int repeat = 0)
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{
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buf2 = new byte[19];
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buf2[0] = 0x21; // Extension introducer
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buf2[1] = 0xFF; // Application extension
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buf2[2] = 0x0B; // Size of block
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buf2[3] = 78; // N
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buf2[4] = 69; // E
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buf2[5] = 84; // T
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buf2[6] = 83; // S
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buf2[7] = 67; // C
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buf2[8] = 65; // A
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buf2[9] = 80; // P
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buf2[10] = 69; // E
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buf2[11] = 50; // 2
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buf2[12] = 46; // .
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buf2[13] = 48; // 0
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buf2[14] = 0x03; // Size of block
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buf2[15] = 0x01; // Loop indicator
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buf2[16] = (byte)(repeat % 0x100); // Number of repetitions
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buf2[17] = (byte)(repeat / 0x100); // 0 for endless loop
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buf2[18] = 0x00; // Block terminator
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buf3 = new byte[8];
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buf3[0] = 0x21; // Extension introducer
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buf3[1] = 0xF9; // Graphic control extension
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buf3[2] = 0x04; // Size of block
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buf3[3] = 0x09; // Flags: reserved, disposal method, user input, transparent color
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buf3[4] = (byte)(delay / 10 % 0x100); // Delay time low byte
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buf3[5] = (byte)(delay / 10 / 0x100); // Delay time high byte
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buf3[6] = 0xFF; // Transparent color index
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buf3[7] = 0x00; // Block terminator
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gifStream = new MemoryStream();
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binaryWriter = new BinaryWriter(gifStream);
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}
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public void AddFrame(Image img)
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{
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using (MemoryStream ms = new MemoryStream())
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{
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img.Save(ms, ImageFormat.Gif);
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buf1 = ms.ToArray();
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}
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if (frameNum == 0)
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{
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// only write these the first time
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binaryWriter.Write(buf1, 0, 781); // Header & global color table
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binaryWriter.Write(buf2, 0, 19); // Application extension
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}
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binaryWriter.Write(buf3, 0, 8); // Graphic extension
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binaryWriter.Write(buf1, 789, buf1.Length - 790); // Image data
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frameNum++;
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}
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public void AddFrame(string path)
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{
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using (Image img = ImageHelpers.LoadImage(path))
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{
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AddFrame(img);
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}
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}
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public void Finish()
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{
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// only write this one the last time
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binaryWriter.Write(59); // Image terminator
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}
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public void Save(string filePath)
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{
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gifStream.WriteToFile(filePath);
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}
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public void Dispose()
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{
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if (gifStream != null) gifStream.Dispose();
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if (binaryWriter != null) binaryWriter.Close();
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}
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}
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} |