高级 gif 库 [英] advanced gif library
问题描述
我正在寻找一个 .NET C# gif 动画库(不一定是免费的),它允许我获取一个 gif 文件并将其附加到一个 jpeg 帧甚至另一个 gif 文件中.我还需要能够在帧之间添加更改延迟.这里对类似问题的回答通常参考一个只允许你在静态图像之间添加固定延迟的基本库.
I'm looking for a .NET C# gif animation library (doesn't have to be free) that will allow me to take a gif file and attach it a frame of jpeg or even another gif file. i will also need to be able to add changing delay between the frames. The answer to similar questions here usually reference to a basic library that only allows you to add a fixed delay between static images.
推荐答案
我最终修改了 http://www.codeproject.com/KB/GDI-plus/Nif.aspx 代码来获得我需要的东西并且它起作用了!:)
I ended up modifying http://www.codeproject.com/KB/GDI-plus/NGif.aspx code to get what I needed and it worked! :)
对于 gif 源文件处理,我添加了此方法:
for the gif source file handling I added this method:
private bool AddGifFrames(Image image)
{
// implementation
var fd = new FrameDimension(image.FrameDimensionsList[0]);
int frameCount = image.GetFrameCount(fd);
var frames = new List<Tuple<int, Image>>();
if (frameCount > 1)
{
frames = new List<Tuple<int, Image>>();
//0x5100 is the property id of the GIF frame's durations
//this property does not exist when frameCount <= 1
byte[] times = image.GetPropertyItem(0x5100).Value;
for (int i = 0; i < frameCount; i++)
{
//selects GIF frame based on FrameDimension and frameIndex
image.SelectActiveFrame(fd, i);
//length in milliseconds of display duration
int length = BitConverter.ToInt32(times, 4 * i);
//save currect image frame as new bitmap
frames.Add(new Tuple<int, Image>(length, new Bitmap(image)));
}
} // Not animated
foreach (var frame in frames)
{
HandleFrame(frame.Item2, frame.Item1);
}
return true;
}
至于自定义延迟,我修改了此方法:
and as for the custom delays I've modified this method:
protected void WriteGraphicCtrlExt(int? delay)
{
Fs.WriteByte(0x21); // extension introducer
Fs.WriteByte(0xf9); // GCE label
Fs.WriteByte(4); // data block size
int transp, disp;
if (Transparent == Color.Empty)
{
transp = 0;
disp = 0; // dispose = no action
}
else
{
transp = 1;
disp = 2; // force clear if using transparent color
}
if (Dispose >= 0)
{
disp = Dispose & 7; // user override
}
disp <<= 2;
// packed fields
Fs.WriteByte(Convert.ToByte(0 | // 1:3 reserved
disp | // 4:6 disposal
0 | // 7 user input - 0 = none
transp)); // 8 transparency flag
WriteShort(delay ?? Delay); // delay x 1/100 sec
Fs.WriteByte(Convert.ToByte(TransIndex)); // transparent color index
Fs.WriteByte(0); // block terminator
}
总结一下 - 此代码可以通过将 gif 拆分为帧并添加它们来将 gif 添加为帧,还可以添加自定义延迟.
to sum it up - this code can add a gif as a frame by splitting it to frames and adding them, and it can also add custom delays.
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