async Task DoImageMagickCommandForGif(CommandContext ctx, byte[] buffer, ImageEditMode mode)
{
if (mode == ImageEditMode.Rescale)
{
await ctx.RespondAsync("이 모드는 속도가 느리고 이미지사이즈에 기반해서 느려지기 때문에 gif는 지원하지 않습니다.");
return;
}
MagickImageCollection image;
try
{
image = new MagickImageCollection(buffer);
}
catch (MagickMissingDelegateErrorException)
{
await ctx.RespondAsync("이미지 파일확장자를 알아볼 수 없다.");
return;
}
int originalWidth = image[0].Width, originalHeight = image[0].Height;
if (originalHeight * originalWidth > 1000000)
{
await ctx.RespondAsync($"Gif exceeds maximum size of 1000000 pixels (Actual size: {originalHeight * originalWidth})");
return;
}
if (image.Count > 100)
{
await ctx.RespondAsync($"Gif exceeds maximum frame count of 100 pixels (Actual count: {image.Count})");
return;
}
image.Coalesce();
long rawLength;
using (MemoryStream stream = new MemoryStream())
{
image.Write(stream);
rawLength = stream.Length;
}
double exceed = rawLength / 4194304d;
double rescale = 1f;
if (exceed > 1.0)
{
rescale = Math.Sqrt(exceed);
}
await ctx.TriggerTypingAsync();
for (int i = 0; i < image.Count; i++)
{
IMagickImage frame = image[i];
if (rescale > 1f)
{
if (rescale > 2f)
{
frame.AdaptiveResize((int)(frame.Width / rescale), (int)(frame.Height / rescale));
}
else
{
frame.Resize((int)(frame.Width / rescale), (int)(frame.Height / rescale));
}
}
DoMagic(mode, frame, originalWidth, originalHeight);
}
await ctx.TriggerTypingAsync();
image.OptimizeTransparency();
using (Stream stream = new MemoryStream())
{
image.Write(stream);
stream.Seek(0, SeekOrigin.Begin);
await ctx.RespondWithFileAsync(stream, "magic.gif");
}
}