public static GifEncoder CreateEncoder(string fileName, int width, int height, ImageHandlerConfig config)
{
switch (config.GifEncoder.Value)
{
default:
case 0:
{
var enc = new BuildInGifEncoder(fileName, width, height);
return(enc);
}
case 1:
{
var enc = new IndexGifEncoder(fileName, width, height);
return(enc);
}
case 2:
{
var enc = new BuildInApngEncoder(fileName, width, height);
enc.OptimizeEnabled = config.PaletteOptimized;
return(enc);
}
}
}
public void SaveAsGif(AnimationItem aniItem, string fileName, ImageHandlerConfig config)
{
//保存动画 天坑代码
var rec = new AnimationRecoder(this.GraphicsDevice);
rec.Items.Add(aniItem);
int length = rec.GetMaxLength();
//rec.GetGifTimeLine(30); 放弃获取时间轴
//预判大小阶段
rec.ResetAll();
Microsoft.Xna.Framework.Rectangle?bounds = null;
int delay = Math.Max(10, config.MinDelay);
for (int d = 0; d <= length; d += delay)
{
rec.Update(TimeSpan.FromMilliseconds(delay));
var rect = aniItem.Measure();
rect.Offset(aniItem.Position);
bounds = (bounds == null || bounds.Value.IsEmpty) ? rect
: Microsoft.Xna.Framework.Rectangle.Union(rect, bounds.Value);
}
//绘制阶段
rec.ResetAll();
switch (config.BackgroundType.Value)
{
default:
case ImageBackgroundType.Transparent:
rec.BackgroundColor = Color.TransparentBlack;
break;
case ImageBackgroundType.Color:
rec.BackgroundColor = System.Drawing.Color.FromArgb(255, config.BackgroundColor.Value).ToXnaColor();
break;
case ImageBackgroundType.Mosaic:
rec.BackgroundImage = MonogameUtils.CreateMosaic(GraphicsDevice,
config.MosaicInfo.Color0.ToXnaColor(),
config.MosaicInfo.Color1.ToXnaColor(),
Math.Max(1, config.MosaicInfo.BlockSize));
break;
}
byte[] buffer = new byte[bounds.Value.Width * bounds.Value.Height * 4];
byte[] bufferPrev = null, bufferGif = null;
int gifTime = 0, prevTime = 0;
string dirName = Path.Combine(Path.GetDirectoryName(fileName),
Path.GetFileNameWithoutExtension(fileName) + ".frames");
if (config.SavePngFramesEnabled && !Directory.Exists(dirName))
{
Directory.CreateDirectory(dirName);
}
//选择encoder
GifEncoder enc;
switch (config.GifEncoder.Value)
{
default:
case 0:
enc = new BuildInGifEncoder(fileName, bounds.Value.Width, bounds.Value.Height);
break;
case 1:
enc = new IndexGifEncoder(fileName, bounds.Value.Width, bounds.Value.Height);
break;
}
Action <int> writeFrame = (curTime) =>
{
unsafe
{
string pngFileName = Path.Combine(dirName, prevTime + ".png");
fixed(byte *pBuffer = bufferPrev, pBufferGif = bufferGif)
{
using (var bmp = new System.Drawing.Bitmap(bounds.Value.Width, bounds.Value.Height, bounds.Value.Width * 4, System.Drawing.Imaging.PixelFormat.Format32bppArgb, new IntPtr(pBuffer)))
{
var tasks = new List <Task>();
if (config.SavePngFramesEnabled) //保存单帧图像
{
tasks.Add(Task.Factory.StartNew(
() => bmp.Save(pngFileName, System.Drawing.Imaging.ImageFormat.Png)
));
}
//保存gif帧
int frameDelay = curTime - gifTime;
frameDelay = (int)(Math.Round(frameDelay / 10.0) * 10);
if (frameDelay > 0)
{
gifTime += frameDelay;
var pData = new IntPtr(pBufferGif);
tasks.Add(Task.Factory.StartNew(() =>
enc.AppendFrame(pData, frameDelay)
));
}
Task.WaitAll(tasks.ToArray());
}
}
}
};
rec.Begin(bounds.Value);
//0长度补丁
for (int d = 0; d <= length; d += delay, rec.Update(TimeSpan.FromMilliseconds(delay)))
{
rec.Draw();
using (var rt = rec.GetPngTexture())
{
rt.GetData(buffer);
//比较上一帧
if (bufferPrev != null)
{
//跳过当前帧
if (memcmp(buffer, bufferPrev, (IntPtr)buffer.Length) == 0)
{
continue;
}
else //计算时间 输出
{
writeFrame(d);
}
}
else
{
bufferPrev = new byte[bounds.Value.Width * bounds.Value.Height * 4];
}
//交换缓冲区
var temp = buffer;
buffer = bufferPrev;
bufferPrev = temp;
prevTime = d;
//透明 额外导出一份gif
if (config.BackgroundType.Value == ImageBackgroundType.Transparent)
{
using (var rt2 = rec.GetGifTexture(config.BackgroundColor.Value.ToXnaColor(), config.MinMixedAlpha))
{
if (bufferGif == null)
{
bufferGif = new byte[bufferPrev.Length];
}
rt2.GetData(bufferGif);
}
}
else
{
bufferGif = bufferPrev;
}
}
}
//输出最后一帧
if (prevTime < length)
{
writeFrame(length);
}
else if (length <= 0) //0长度补丁
{
writeFrame(100);
}
//保存动画长度
if (config.SavePngFramesEnabled)
{
File.WriteAllText(Path.Combine(dirName, "delay.txt"), length.ToString());
}
rec.End();
enc.Dispose();
}
