private static void GenerateThumbGif(GifDecoder decoder, string thumbPath, Size thumbSize)
{
GifEncoder encoder = new GifEncoder();
encoder.Start(thumbPath);
encoder.SetSize(thumbSize.Width, thumbSize.Height);
encoder.SetRepeat(decoder.GetLoopCount());
Bitmap bitmap = new Bitmap(thumbSize.Width, thumbSize.Height);
for (int i = 0; i < decoder.GetFrameCount(); i++)
{
encoder.SetDelay(decoder.GetDelay(i));
int dispose = decoder.GetDispose(i);
Color tranColor = decoder.GetTransparent(i);
if (tranColor.IsEmpty == false)
{
encoder.SetTransparent(decoder.GetTransparent(i));
}
if (dispose != 1)
{
bitmap.Dispose();
bitmap = new Bitmap(thumbSize.Width, thumbSize.Height);
}
using (Graphics g = Graphics.FromImage(bitmap))
{
if (dispose == 2)
{
g.FillRectangle(new SolidBrush(tranColor), 0, 0, thumbSize.Width, thumbSize.Height);
}
//else if(dispose == 5)
//{
// g.FillRectangle(new SolidBrush(Color.Black), 0, 0, thumbSize.Width, thumbSize.Height);
//}
g.DrawImage(decoder.GetFrame(i), 0, 0, thumbSize.Width, thumbSize.Height);
}
encoder.AddFrame(bitmap);
}
bitmap.Dispose();
//using (Bitmap bitmap = new Bitmap(thumbSize.Width, thumbSize.Height))
//{
// for (int i = 0; i < decoder.GetFrameCount(); i++)
// {
// encoder.SetDelay(decoder.GetDelay(i));
// Color tran = decoder.GetTransparent(i);
// using (Graphics g = Graphics.FromImage(bitmap))
// {
// if (tran != Color.Empty)
// {
// g.FillRectangle(new SolidBrush(tran), 0, 0, thumbSize.Width, thumbSize.Height);
// }
// else
// {
// }
// g.DrawImage(decoder.GetFrame(i), 0, 0, thumbSize.Width, thumbSize.Height);
// }
// encoder.AddFrame(bitmap);
// }
//}
encoder.Finish();
}