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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