Unity WWW.texture 加载图片质量差

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public Texture2D texture
{
  get
  {
    return this.CreateTextureFromDownloadedData(false);
  }
}

private Texture2D CreateTextureFromDownloadedData(bool markNonReadable)
{
  if (!this.WaitUntilDoneIfPossible())
    return new Texture2D(2, 2);
  if (this._uwr.isNetworkError)
    return (Texture2D) null;
  DownloadHandler downloadHandler = this._uwr.downloadHandler;
  if (downloadHandler == null)
    return (Texture2D) null;
  Texture2D tex = new Texture2D(2, 2);
  tex.LoadImage(downloadHandler.data, markNonReadable);
  return tex;
}


public Texture2D(int width, int height)
  : this(width, height, TextureFormat.RGBA32, true, false, IntPtr.Zero)
{
}

internal Texture2D(
  int width,
  int height,
  TextureFormat textureFormat,
  bool mipChain,
  bool linear,
  IntPtr nativeTex)
{
  if (!this.ValidateFormat(textureFormat))
    return;
  GraphicsFormat graphicsFormat = GraphicsFormatUtility.GetGraphicsFormat(textureFormat, !linear);
  TextureCreationFlags flags = TextureCreationFlags.None;
  if (mipChain)
    flags |= TextureCreationFlags.MipChain;
  if (GraphicsFormatUtility.IsCrunchFormat(textureFormat))
    flags |= TextureCreationFlags.Crunch;
  Texture2D.Internal_Create(this, width, height, graphicsFormat, flags, nativeTex);
}

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var texture = new Texture2D(2, 2, TextureFormat.RGBA32, false);
www.LoadImageIntoTexture(texture);