Unity：支持base64转Image和自定义生成文本图片

红太狼 2024-04-20 12:21 90阅读 0赞

##### 1、支持base64转Image #####

/// <summary>
    /// base64转Image
    /// </summary>
    /// <param name="filePath"></param>
    /// <param name="imageBase64"></param>
    public static void GetImageByBase64(string filePath, string imageBase64)
    {
      try
      {
          byte[] arr2 = Convert.FromBase64String(imageBase64);
          using (MemoryStream ms2 = new MemoryStream(arr2))
          {
              Bitmap bmp2 = new Bitmap(ms2);
    
              //这里复制一份对图像进行保存，否则会出现“GDI+ 中发生一般性错误”的错误提示
              Bitmap bmpNew = new Bitmap(bmp2);
              ms2.Close();
              bmpNew.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);
              bmpNew.Dispose();
              bmp2.Dispose();
              
          }
      }
      catch(Exception e)
      {
          Debug.LogError("GetImageByBase64:" + e.ToString());
      }          
    }

##### 2、支持自定义生成文本图片 #####

/// <summary>
    /// 创建文本图片
    /// </summary>
    /// <param name="filePath"></param>
    /// <param name="text"></param>
    public static void CreateTextImage(string filePath, string text)
    {
        try
        {
            System.Drawing.Font font = new System.Drawing.Font("宋体", 14);
            Bitmap bmpNew = TextToBitmap(text, font, Rectangle.Empty,
                 System.Drawing.Color.Black, System.Drawing.Color.FromArgb(0, System.Drawing.Color.White));
            bmpNew.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);
            bmpNew.Dispose();
        }
        catch (Exception e)
        {
            Debug.LogError("CreateTextImage:" + e.ToString());
        }
    }

文字转换Bitmap

/// <summary>
    /// 把文字转换才Bitmap
    /// </summary>
    /// <param name="text"></param>
    /// <param name="font"></param>
    /// <param name="rect">用于输出的矩形，文字在这个矩形内显示，为空时自动计算</param>
    /// <param name="fontcolor">字体颜色</param>
    /// <param name="backColor">背景颜色</param>
    /// <returns></returns>
    private static Bitmap TextToBitmap(string text, System.Drawing.Font font, Rectangle rect
    , System.Drawing.Color fontcolor
    , System.Drawing.Color backColor)
    {
        Graphics g;
        Bitmap bmp;
        StringFormat format = new StringFormat(StringFormatFlags.NoClip);
        if (rect == Rectangle.Empty)
        {
            bmp = new Bitmap(1, 1);
            g = Graphics.FromImage(bmp);
            //计算绘制文字所需的区域大小（根据宽度计算长度），重新创建矩形区域绘图
            SizeF sizef = g.MeasureString(text, font, PointF.Empty, format);
    
            int width = (int)(sizef.Width + 1);
            int height = (int)(sizef.Height + 1);
            rect = new Rectangle(0, 0, width, height);
            bmp.Dispose();
    
            bmp = new Bitmap(width, height);
        }
        else
        {
            bmp = new Bitmap(rect.Width, rect.Height);
        }
    
        g = Graphics.FromImage(bmp);
    
        //使用ClearType字体功能
        g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
        g.FillRectangle(new SolidBrush(backColor), rect);
        g.DrawString(text, font, Brushes.Black, rect, format);
        return bmp;
    }

##### 3、调用函数demo #####

生成透明背景的图片，可以自定义图片格式。

private void main()
    {
    	string strText = "到此一游";
    	string path = "d:\\image.png";
    	CreateTextImage(path, strText);
    }