IC.CoolWatermark.dll vs Graphics - 性能速度 [英] IC.CoolWatermark.dll vs Graphics - perfomance speed

问题描述

i需要在图像上添加水印。



i以双向方式进行水印。



第一种方法，



使用IC.CoolWatermark.dll



string WaterMarkText =Comp Name; //水印文本

System.Drawing.Image bitmap = System.Drawing.Image.FromStream（stream）; //从数据库获取图像



IC.CoolWatermark.Writer writer = new Writer（bitmap）;

writer.PositionStyle = PositionStyle.MiddleCenter ;

writer.Shadow = new Shadow（Color.Transparent，0,0）;

writer.FontStyle = FontStyle.Regular;

writer .Border = new Border（Pens.Gray）;

writer.FontFamily = new FontFamily（Cambria）;

writer.FontSize = watermarkfontsize（writer.Image.Width ）;

writer.Colors [0] = Color.Transparent;

IC.CoolWatermark.Shape shape = new IC.CoolWatermark.Shape（）;

shape.ShapeStyle = IC.CoolWatermark.ShapeStyle.ShearVertical;

writer.Shape = shape;

writer.Angle = 320;

bitmap = new Bitm ap（writer.WriteText（WaterMarkText））;



MemoryStream oStream = new MemoryStream（）;

bitmap.Save（oStream，System。 Drawing.Imaging.ImageFormat.Png）;

context.Response.BinaryWrite（oStream.ToArray（））;

bitmap.Dispose（）;



第二种方式：



使用System.Drawing.Graphics





string path = context.Server.MapPath（〜/ Image / water_02.png）; //水印图片



位图_watermarkImage =新位图（路径）; //水印图片

位图_baseImage = new Bitmap（stream）; //来自数据库的图像应该与水印图像重叠



//从左边10个像素和从基础图像顶部10个像素绘制水印偏移。 br />


图形画布= Graphics.FromImage（_baseImage）;





canvas .DrawImage（_watermarkImage，new Rectangle（20,10，_ watermarkImage.Width，_watermarkImage.Height），0,10，



_watermarkImage.Width，



_watermarkImage.Height，



GraphicsUnit.Pixel）;

canvas.Save（）;

_baseImage.Save（context.Response.OutputStream，ImageFormat.Jpeg）;



//清理

_baseImage.Dispose（）;

canvas.Dispose（）;



在第一种方法中，我使用IC.CoolWatermark.dll编写文本。但是在sencod方法中，我正在绘制图像以将两个图像重叠在一起。



两者都是有效的。但是哪一个最适合表现明智。哪一个我可以用于我的项目？



谢谢！

Hi,

i need to watermark on images.

i did it in two way.

first method,

using IC.CoolWatermark.dll

string WaterMarkText = "Comp Name"; // watermark text
System.Drawing.Image bitmap = System.Drawing.Image.FromStream(stream); // got image from database

IC.CoolWatermark.Writer writer = new Writer(bitmap);
writer.PositionStyle = PositionStyle.MiddleCenter;
writer.Shadow = new Shadow(Color.Transparent, 0, 0);
writer.FontStyle = FontStyle.Regular;
writer.Border = new Border(Pens.Gray);
writer.FontFamily = new FontFamily("Cambria");
writer.FontSize = watermarkfontsize(writer.Image.Width);
writer.Colors[0] = Color.Transparent;
IC.CoolWatermark.Shape shape = new IC.CoolWatermark.Shape();
shape.ShapeStyle = IC.CoolWatermark.ShapeStyle.ShearVertical;
writer.Shape = shape;
writer.Angle = 320;
bitmap = new Bitmap(writer.WriteText(WaterMarkText));

MemoryStream oStream = new MemoryStream();
bitmap.Save(oStream, System.Drawing.Imaging.ImageFormat.Png);
context.Response.BinaryWrite(oStream.ToArray());
bitmap.Dispose();

second way:

using " System.Drawing.Graphics"


string path = context.Server.MapPath("~/Image/water_02.png"); // watermark image

Bitmap _watermarkImage = new Bitmap(path); // watermark image
Bitmap _baseImage = new Bitmap(stream); // image from database which should overlap with watermark image

//Draw the watermark offset 10 pixels from the left and 10 pixels from the top of the base image.

Graphics canvas = Graphics.FromImage(_baseImage);


canvas.DrawImage(_watermarkImage,new Rectangle(20, 10, _watermarkImage.Width, _watermarkImage.Height), 0, 10,

_watermarkImage.Width,

_watermarkImage.Height,

GraphicsUnit.Pixel);
canvas.Save();
_baseImage.Save(context.Response.OutputStream, ImageFormat.Jpeg);

//clean up
_baseImage.Dispose();
canvas.Dispose();

In first method, i am writing text using IC.CoolWatermark.dll. But in sencod method i am drawing image to get overlapped two images together.

Both are works. But which one is best in order performance wise. which one i can use for my project?

Thanks!

推荐答案

如果你已经开发了代码对于所有方法，只需使用类 System.Diagnostics.Stopwatch 类解决一些特征任务由一个和另一个解决的问题：

http://msdn.microsoft.com/en-us/library/ system.diagnostics.stopwatch％28v = vs.110％29.aspx [ ^ ]。



在计时中，有一个微妙的时刻：你必须从时间中排除JIT编译器。由于编译器基于每个方法工作，您需要做一件简单的事情来实现：在开始计时之前至少调用所涉及的所有方法一次。有关JIT的理解，请参阅： http://en.wikipedia.org/wiki/Just-in-time_compilation [ ^ ]。

-SA

If you already developed the code for all methods, just time some characteristic tasks solved by one and another one, using the class System.Diagnostics.Stopwatch:
http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch%28v=vs.110%29.aspx[^].

In timing, there is one delicate moment: you have to exclude JIT compiler from timing. As the compiler works on per-method basis, you need to do one simple thing to achieve that: call all the methods involved at least once before you start timing. For understanding JIT, please see: http://en.wikipedia.org/wiki/Just-in-time_compilation[^].

—SA

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