unity 生成缩略图 , 图片缩放

 

public static Texture2D Resize(Texture2D source, int newWidth, int newHeight)
        {
            source.filterMode = FilterMode.Point;
            RenderTexture rt = RenderTexture.GetTemporary(newWidth, newHeight);
            rt.filterMode = FilterMode.Point;
            RenderTexture.active = rt;
            Graphics.Blit(source, rt);
            var nTex = new Texture2D(newWidth, newHeight);
            nTex.ReadPixels(new Rect(0, 0, newWidth, newHeight), 0, 0);
            nTex.Apply();
            RenderTexture.active = null;
            return nTex;
        }