Texture2d 缩略图

     
/// <summary>
/// Texture 扩展
/// </summary>
public static class TextureExtent
{

    /// <summary>
    /// 创建新尺寸的 Texture
    /// </summary>
    /// <param name="tex"></param>
    /// <param name="width"></param>
    /// <param name="height"></param>
    /// <returns></returns>
    public static Texture NewSize(this Texture tex, int width, int height)
    {
        if (null == tex)
            return null;

        tex.filterMode = FilterMode.Point;
        RenderTexture rt = RenderTexture.GetTemporary(width, height);
        rt.filterMode = FilterMode.Point;
        RenderTexture.active = rt;
        Graphics.Blit(tex, rt);
        var nTex = new Texture2D(width, height);
        nTex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        nTex.Apply();
        RenderTexture.active = null;
        return nTex;
    }

}