#region 多图片合成
        /// <summary>
        /// 插入图像
        /// </summary>
        /// <param name="srcBmp">原始图像</param>
        /// <param name="insertBmp">需要要插入的图像</param>
        /// <param name="p">位置</param>
        /// <param name="imgpath">保存路径</param>
        /// <param name="filename">文件名称</param>
        /// <returns></returns>
        public string InsertImage(Bitmap srcBmp, List<Bitmap> insertBmp, List<Point> p, string imgpath, string filename)
        {
            string resturnfilename = "";
            try
            {
                Bitmap temp = (Bitmap)srcBmp;
                Bitmap bmap = (Bitmap)temp.Clone();
                Graphics gr = Graphics.FromImage(bmap);
                for (int i = 0; i < insertBmp.Count; i++)
                {
                    Rectangle rect = new Rectangle(p[i].X, p[i].Y, insertBmp[i].Width, insertBmp[i].Height);
                    gr.DrawImage(insertBmp[i], rect);
                }

                //创建一个Endoder对象
                System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
                ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);

                // 创建一个EncoderParameters对象.
                EncoderParameters myEncoderParameters = new EncoderParameters(1);
                EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 100L);//这里的50L用来设置保存时的图片质量
                                                                                            //测试时400多K的图片保存为100多K，图片失真也不是很厉害
                myEncoderParameters.Param[0] = myEncoderParameter;
                string savePath = filename + ".jpeg";

                bmap.Save(imgpath + savePath, jgpEncoder, myEncoderParameters);
                resturnfilename = savePath;

            }
            catch (Exception ex)
            {
                resturnfilename = "";
            }
            return resturnfilename;
        }

        /// <summary>
        /// 获取特定的图像编解码信息
        /// </summary>
        /// <param name="format"></param>
        /// <returns></returns>
        private static ImageCodecInfo GetEncoder(ImageFormat format)
        {
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();

            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                    return codec;
                }
            }
            return null;
        }
#endregion

 //调用
 List<Point> plist = new List<Point>();  //坐标集合
 List<Bitmap> blist = new List<Bitmap>();   //图片及大小集合【对应上述坐标对应】


//处理点位
   Point point1 = new Point(PointX, PointY);
   plist.Add(point1);

//处理图片大小
   string DownUrl = Server.MapPath("//" + item.DownUrl);
   Image image = Image.FromFile(DownUrl);
   Bitmap bitmap1 = new Bitmap(image, location.Width, location.Height);
   blist.Add(bitmap1);

 string DownUrl2 = Server.MapPath("//" + resources.DownUrl);
 Image image2 = Image.FromFile(DownUrl2);
 Bitmap bitmap2 = new Bitmap(image2);

 string imgpath = Server.MapPath("\\SaleOver\\" + GroupInfoPID + "\\"); //保存路径
 if (!Directory.Exists(imgpath))
 {
      Directory.CreateDirectory(imgpath);
 }
 string resurnfilename = InsertImage(bitmap2, blist, plist, imgpath, "文件名称");

 

在工作中遇到了需要把两张图片合成一张图片的需求，在网上没有查找到好的解决方法，经过查找和询问别人解决了这个问题。话不多说上干货！
 public Texture2D TwoToOne(Texture2D source, Texture2D target)//图片合成
        { for (int x = 0; x < target.width; x++)
              {  for (int y = 0; y < target.height; y++)
               if (target.GetPixel(x, y).a != 0)
                    {
                        source.SetPixel(x, y, new Color(target.GetPixel(x, y).r, target.GetPixel(x, y).g,
    target.GetPixel(x, y).b, target.GetPixel(x, y).a));
                    } 
                      }
            }
                      source.Apply();
                            return source;
这次干货分享就到这里 如果对你有所帮助请给我点个赞！

下面是一个方法，用的时候只用调用这个方法并给他传一张你要的合成的图片就好



//截图
-(UIImage*)convertViewToImage{

    CGSize muhuSize = CGSizeMake(HXWidth,HXWidth);
    UIGraphicsBeginImageContextWithOptions(muhuSize, NO, [UIScreen mainScreen].scale);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage*theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    CGRect rect = CGRectMake(0, 0, theImage.size.width*3, theImage.size.height*3);
    CGImageRef imageRef = theImage.CGImage;
    CGImageRef imagePartRef = CGImageCreateWithImageInRect(imageRef, rect);
    UIImage *cropImage = [UIImage imageWithCGImage:imagePartRef];
    CGImageRelease(imagePartRef);
    return cropImage;
}


调用的代码



UIImage *image = [self convertViewToImage];
publish.croppedImage = image;

js代码
function hecheng(){
draw(function(){
document.getElementById('imgBox').innerHTML='
合成图片成功！可以鼠标另存图片查看我是否是一张图片~~！
';
})
}
var data=['img1.png','img2.png','img3.png','img4.png'],base64=[];
function draw(fn){
var c=document.createElement('canvas'),
ctx=c.getContext('2d'),
len=data.length;
c.width=290;
c.height=290;
ctx.rect(0,0,c.width,c.height);
ctx.fillStyle='#fff';
ctx.fill();
function drawing(n){
if(n
var img=new Image;
//img.crossOrigin = 'Anonymous'; //解决跨域
img.src=data[n];
img.οnlοad=function(){
ctx.drawImage(img,0,0,290,290);
drawing(n+1);//递归
}
}else{
//保存生成作品图片
base64.push(c.toDataURL("image/jpeg",0.8));
//alert(JSON.stringify(base64));
fn();
}
}
drawing(0);
}