public static byte[] GetThumbnailGIF89a(Stream stream, Size min, Size thumb)
{
long offset = stream.Position;
GifDecoder decoder = new GifDecoder();
decoder.Read(stream);
Size sz = decoder.GetFrameSize();
stream.Seek(offset, SeekOrigin.Begin);
if (min != null && sz.Width < min.Width && sz.Height < min.Height)
{
throw new InvalidImageSizeException(
string.Empty, sz, min);
}
return GetResizedImageBytesGIF89a(decoder, stream, thumb, s_ImageQuality);
}
public static void Resize(GifDecoder decoder, Stream outStream, int width, int height, int quality)
{
AnimatedGifEncoder encoder = new AnimatedGifEncoder();
Size sourcesize = decoder.GetFrameSize();
encoder.SetSize(sourcesize.Width < sourcesize.Height ? new Size(width, height) : new Size(height, width));
encoder.SetRepeat(decoder.GetLoopCount());
// encoder.SetQuality(quality);
encoder.Start(outStream);
for (int i = 0; i < decoder.GetFrameCount(); i++)
{
GifDecoder.GifFrame frame = decoder.GetFrame(i);
encoder.SetDelay(frame.delay);
encoder.SetTransparent(Color.FromArgb(frame.bgcolor));
encoder.AddFrame(decoder.GetFrameImage(i));
}
encoder.Finish();
outStream.Flush();
}
public static void Resize(GifDecoder decoder, Stream outStream, int width, int height, int quality)
{
AnimatedGifEncoder encoder = new AnimatedGifEncoder();
Size sourcesize = decoder.GetFrameSize();
encoder.SetSize(sourcesize.Width < sourcesize.Height ? new Size(width, height) : new Size(height, width));
encoder.SetRepeat(decoder.GetLoopCount());
// encoder.SetQuality(quality);
encoder.Start(outStream);
for (int i = 0; i < decoder.GetFrameCount(); i++)
{
GifDecoder.GifFrame frame = decoder.GetFrame(i);
encoder.SetDelay(frame.delay);
encoder.SetTransparent(Color.FromArgb(frame.bgcolor));
encoder.AddFrame(decoder.GetFrameImage(i));
}
encoder.Finish();
outStream.Flush();
}
public static byte[] GetResizedImageBytesGIF89a(GifDecoder originalimage, Stream stream, Size ts, int quality)
{
Size sz = originalimage.GetFrameSize();
if (sz.Height > ts.Height || sz.Width > ts.Width)
{
MemoryStream ms = new MemoryStream();
AnimatedGifEncoder.Resize(originalimage, ms, ts.Width, ts.Height, quality);
ms.Flush();
byte[] result = new byte[ms.Length];
MemoryStream resultstream = new MemoryStream(result);
ms.WriteTo(resultstream);
return result;
}
else
{
stream.Seek(0, SeekOrigin.Begin);
BinaryReader sr = new BinaryReader(stream);
return sr.ReadBytes((int)stream.Length);
}
}
public static bool TryGetResizedImageBytesGIF89a(Stream stream, Size ts, int quality, out Size sz, out byte[] bytes)
{
bytes = null;
sz = default(Size);
GifDecoder originalimage = new GifDecoder();
if (!originalimage.TryRead(stream))
return false;
sz = originalimage.GetFrameSize();
bytes = GetResizedImageBytesGIF89a(originalimage, stream, ts, quality);
return true;
}
public static byte[] GetResizedImageBytesGIF89a(Stream stream, Size ts, int quality, out Size sz)
{
GifDecoder originalimage = new GifDecoder();
originalimage.Read(stream);
sz = originalimage.GetFrameSize();
return GetResizedImageBytesGIF89a(originalimage, stream, ts, quality);
}
