2013-11-03 23:53:49 +13:00
|
|
|
|
#region License Information (GPL v3)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
ShareX - A program that allows you to take screenshots and share any file type
|
|
|
|
|
Copyright (C) 2008-2013 ShareX Developers
|
|
|
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
|
|
|
modify it under the terms of the GNU General Public License
|
|
|
|
|
as published by the Free Software Foundation; either version 2
|
|
|
|
|
of the License, or (at your option) any later version.
|
|
|
|
|
|
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
|
GNU General Public License for more details.
|
|
|
|
|
|
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
|
|
|
along with this program; if not, write to the Free Software
|
|
|
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
|
|
|
|
|
|
|
|
Optionally you can also view the license at <http://www.gnu.org/licenses/>.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#endregion License Information (GPL v3)
|
|
|
|
|
|
|
|
|
|
using System;
|
|
|
|
|
using System.Drawing;
|
|
|
|
|
using System.IO;
|
|
|
|
|
|
|
|
|
|
namespace HelpersLib
|
|
|
|
|
{
|
|
|
|
|
public class GifCreator : IDisposable
|
|
|
|
|
{
|
|
|
|
|
private byte[] graphicControlExtensionBlock, loopBlock;
|
|
|
|
|
private MemoryStream gifStream;
|
|
|
|
|
private BinaryWriter binaryWriter;
|
|
|
|
|
private int frameNum;
|
|
|
|
|
|
|
|
|
|
public GifCreator(int delay, int repeat = 0)
|
|
|
|
|
{
|
|
|
|
|
byte[] signature = new byte[] { (byte)'G', (byte)'I', (byte)'F', (byte)'8', (byte)'9', (byte)'a' };
|
|
|
|
|
graphicControlExtensionBlock = CreateGraphicControlExtensionBlock(delay);
|
|
|
|
|
loopBlock = CreateLoopBlock(repeat);
|
|
|
|
|
gifStream = new MemoryStream();
|
|
|
|
|
binaryWriter = new BinaryWriter(gifStream);
|
|
|
|
|
binaryWriter.Write(signature);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public void AddFrame(Image img, GIFQuality quality = GIFQuality.Default)
|
|
|
|
|
{
|
|
|
|
|
GifClass gif = new GifClass();
|
|
|
|
|
gif.LoadGifPicture(img, quality);
|
|
|
|
|
|
|
|
|
|
if (frameNum == 0)
|
|
|
|
|
{
|
|
|
|
|
binaryWriter.Write(gif.m_ScreenDescriptor.ToArray());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
binaryWriter.Write(graphicControlExtensionBlock);
|
|
|
|
|
binaryWriter.Write(gif.m_ImageDescriptor.ToArray());
|
|
|
|
|
binaryWriter.Write(gif.m_ColorTable.ToArray());
|
|
|
|
|
binaryWriter.Write(gif.m_ImageData.ToArray());
|
|
|
|
|
|
|
|
|
|
frameNum++;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public void AddFrame(string path, GIFQuality quality = GIFQuality.Default)
|
|
|
|
|
{
|
2013-11-21 06:59:00 +13:00
|
|
|
|
using (Image img = ImageHelpers.LoadImage(path))
|
2013-11-03 23:53:49 +13:00
|
|
|
|
{
|
|
|
|
|
AddFrame(img, quality);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public void Finish()
|
|
|
|
|
{
|
|
|
|
|
binaryWriter.Write(CreateLoopBlock());
|
|
|
|
|
binaryWriter.Write(0x3B); // Image terminator
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public void Save(string filePath)
|
|
|
|
|
{
|
|
|
|
|
gifStream.WriteToFile(filePath);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private byte[] CreateGraphicControlExtensionBlock(int delay)
|
|
|
|
|
{
|
|
|
|
|
byte[] buffer = new byte[8];
|
|
|
|
|
buffer[0] = 0x21; // Extension introducer
|
|
|
|
|
buffer[1] = 0xF9; // Graphic control extension
|
|
|
|
|
buffer[2] = 0x04; // Size of block
|
|
|
|
|
buffer[3] = 0x09; // Flags: reserved, disposal method, user input, transparent color
|
|
|
|
|
buffer[4] = (byte)(delay / 10 % 0x100); // Delay time low byte
|
|
|
|
|
buffer[5] = (byte)(delay / 10 / 0x100); // Delay time high byte
|
|
|
|
|
buffer[6] = 0xFF; // Transparent color index
|
|
|
|
|
buffer[7] = 0x00; // Block terminator
|
|
|
|
|
return buffer;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private byte[] CreateLoopBlock(int repeat = 0)
|
|
|
|
|
{
|
|
|
|
|
byte[] buffer = new byte[19];
|
|
|
|
|
buffer[0] = 0x21; // Extension introducer
|
|
|
|
|
buffer[1] = 0xFF; // Application extension
|
|
|
|
|
buffer[2] = 0x0B; // Size of block
|
|
|
|
|
buffer[3] = (byte)'N';
|
|
|
|
|
buffer[4] = (byte)'E';
|
|
|
|
|
buffer[5] = (byte)'T';
|
|
|
|
|
buffer[6] = (byte)'S';
|
|
|
|
|
buffer[7] = (byte)'C';
|
|
|
|
|
buffer[8] = (byte)'A';
|
|
|
|
|
buffer[9] = (byte)'P';
|
|
|
|
|
buffer[10] = (byte)'E';
|
|
|
|
|
buffer[11] = (byte)'2';
|
|
|
|
|
buffer[12] = (byte)'.';
|
|
|
|
|
buffer[13] = (byte)'0';
|
|
|
|
|
buffer[14] = 0x03; // Size of block
|
|
|
|
|
buffer[15] = 0x01; // Loop indicator
|
|
|
|
|
buffer[16] = (byte)(repeat % 0x100); // Number of repetitions
|
|
|
|
|
buffer[17] = (byte)(repeat / 0x100); // 0 for endless loop
|
|
|
|
|
buffer[18] = 0x00; // Block terminator
|
|
|
|
|
return buffer;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public void Dispose()
|
|
|
|
|
{
|
|
|
|
|
if (gifStream != null) gifStream.Dispose();
|
|
|
|
|
if (binaryWriter != null) binaryWriter.Close();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|