Unity3D实现播放gif图功能

unity是不识别gif格式图的，需要我们使用c#将gif里多帧图转化为texture2d格式。需要使用system.drawing.dll.此dll在unity安装目录下就可以找到。由于unity没有gif格式的文件，所以我们无法在面板指定，需要动态加载。所以将gif图放在streamingassets文件夹下。以下为源代码：

using system;
using system.collections;
using system.collections.generic;
using system.drawing;
using system.drawing.imaging;
using system.io;
using unityengine;
 
public class playgif : monobehaviour {
 
  public unityengine.ui.image im;
  public string gifname = "";
  public gameobject[] ims;
  [serializefield]
  private float fps = 5f;
  private list<texture2d> tex2dlist = new list<texture2d>();
  private float time;
  bitmap mybitmp;
  void start()
  {
    system.drawing.image image = system.drawing.image.fromfile(application.streamingassetspath + "/"+gifname+".gif");
    tex2dlist = mygif(image);
  }
 
  // update is called once per frame
  void update()
  {
    if (tex2dlist.count > 0)
    {
      time += time.deltatime;
      int index = (int)(time * fps) % tex2dlist.count;
      if (im != null)
      {
        im.sprite = sprite.create(tex2dlist[index], new rect(0, 0, tex2dlist[index].width, tex2dlist[index].height), new vector2(0.5f, 0.5f));
      }
      if (ims.length != 0)
      {
        for (int i = 0; i < ims.length; i++)
          ims[i].getcomponent<renderer>().material.maintexture = tex2dlist[index];
 
      }
    }
  }
  private list<texture2d> mygif(system.drawing.image image)
  {
 
    list<texture2d> tex = new list<texture2d>();
    if (image != null)
    {
 
      //debug.log("图片张数：" + image.framedimensionslist.length);
      framedimension frame = new framedimension(image.framedimensionslist[0]);
      int framcount = image.getframecount(frame);//获取维度帧数
      for (int i = 0; i < framcount; ++i)
      {
 
        image.selectactiveframe(frame, i);
        bitmap frambitmap = new bitmap(image.width, image.height);
        using (system.drawing.graphics graphic = system.drawing.graphics.fromimage(frambitmap))
        {
          graphic.drawimage(image, point.empty);
        }
        texture2d frametexture2d = new texture2d(frambitmap.width, frambitmap.height, textureformat.argb32, true);
        frametexture2d.loadimage(bitmap2byte(frambitmap));
        tex.add(frametexture2d);
      }
    }
    return tex;
  }
  private byte[] bitmap2byte(bitmap bitmap)
  {
    using (memorystream stream = new memorystream())
    {
      // 将bitmap 以png格式保存到流中
      bitmap.save(stream, imageformat.png);
      // 创建一个字节数组，长度为流的长度
      byte[] data = new byte[stream.length];
      // 重置指针
      stream.seek(0, seekorigin.begin);
      // 从流读取字节块存入data中
      stream.read(data, 0, convert.toint32(stream.length));
      return data;
    }
  }
}

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