image watch自定义

安装image watch模块除了可以查看OpenCV，也可以查看自定义的图像格式。

可以参考的官方文档： https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-2015/debugger/image-watch/image-watch-reference?view=vs-2015

可以从 C:\Users\USERNAME\AppData\Local\Microsoft\VisualStudio\17.0_6e3f40f8\Extensions\a14eewtt.z12 文件夹看到OpenCV的配置文件 ImageWatchOpenCV.natvis 进行对照参考

<?xml version="1.0" encoding="utf-8"?>
<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010"><UIVisualizer ServiceId="{A452AFEA-3DF6-46BB-9177-C0B08F318025}" Id="1" MenuName="Add to Image Watch"/><!-- OpenCV cv::Mat --><Type Name="cv::Mat"><AlternativeType Name="cv::Mat_&lt;*&gt;"/><UIVisualizer ServiceId="{A452AFEA-3DF6-46BB-9177-C0B08F318025}" Id="1" /></Type><Type Name="cv::Mat"><AlternativeType Name="cv::Mat_&lt;*&gt;"/><DisplayString Condition="(flags&amp;7)==0">{{UINT8, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><DisplayString Condition="(flags&amp;7)==1">{{INT8, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><DisplayString Condition="(flags&amp;7)==2">{{UINT16, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><DisplayString Condition="(flags&amp;7)==3">{{INT16, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><DisplayString Condition="(flags&amp;7)==4">{{INT32, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><DisplayString Condition="(flags&amp;7)==5">{{FLOAT32, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><DisplayString Condition="(flags&amp;7)==6">{{FLOAT64, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><DisplayString Condition="(flags&amp;7)==7">{{USER, {((flags&amp;0xfff)&gt;&gt;3)+1} x {cols} x {rows}}}</DisplayString><Expand><Synthetic Name="[type]" Condition="(flags&amp;7)==0"><DisplayString>UINT8</DisplayString></Synthetic><Synthetic Name="[type]" Condition="(flags&amp;7)==1"><DisplayString>INT8</DisplayString></Synthetic><Synthetic Name="[type]" Condition="(flags&amp;7)==2"><DisplayString>UINT16</DisplayString></Synthetic><Synthetic Name="[type]" Condition="(flags&amp;7)==3"><DisplayString>INT16</DisplayString></Synthetic><Synthetic Name="[type]" Condition="(flags&amp;7)==4"><DisplayString>INT32</DisplayString></Synthetic><Synthetic Name="[type]" Condition="(flags&amp;7)==5"><DisplayString>FLOAT32</DisplayString></Synthetic><Synthetic Name="[type]" Condition="(flags&amp;7)==6"><DisplayString>FLOAT64</DisplayString></Synthetic><Item Name="[channels]">((flags&amp;0xfff)&gt;&gt;3)+1</Item><Item Name="[width]">cols</Item><Item Name="[height]">rows</Item><Item Name="[data]">data</Item><Item Name="[stride]">step.p[0]</Item></Expand></Type>
</AutoVisualizer>

然后结合官方示例文档：

struct My8BitRGBImage 
{ unsigned int ncols; unsigned int nrows; unsigned char* data; 
};--------------------
<?xml version="1.0" encoding="utf-8"?> 
<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010"> <UIVisualizer ServiceId="{A452AFEA-3DF6-46BB-9177-C0B08F318025}" Id="1"  MenuName="Add to Image Watch"/> <Type Name="My8BitRGBImage"> <UIVisualizer ServiceId="{A452AFEA-3DF6-46BB-9177-C0B08F318025}" Id="1" /> </Type> <Type Name="My8BitRGBImage"> <Expand> <Synthetic Name="[type]"> <DisplayString>UINT8</DisplayString> </Synthetic> <Synthetic Name="[channels]"> <DisplayString>RGB</DisplayString> </Synthetic> <Item Name="[width]">ncols</Item> <Item Name="[height]">nrows</Item> <Item Name="[data]">data</Item> <Item Name="[stride]">ncols*3</Item> </Expand> </Type>   
</AutoVisualizer>

所以Type Name设置为class类名，图像内部需要设置 type|channels|width|height|data|stride等参数。
如果要对模板类进行处理（模版类的中括号<(<) >(*>) &（&）），需要针对类型去做type区分， 这里的Condition=就相当于 switch-case,type支持的数据类型从官方文档可以查到：

image Watch supports these channel types:
INT8, UINT8
INT16, UINT16
INT32
FLOAT16
FLOAT32
FLOAT64

编写好.natvis 并保存在

C:\Users\%USERNAME%\Documents\Visual Studio 2022\Visualizers

即可支持自定义图像格式。