Load texture from memory, but imgui display nothing

[InfernoidZero]

I need to read a picture and use opencv to do some preprocess, then display the result in imgui. I try use stb_image to convert cv::Mat to texture, like the example imgui wiki provides. But when I run it, the window plays nothing. Here is my code

    cv::Mat image = cv::imread(FilePath, cv::IMREAD_COLOR);
    cv::cvtColor(image, image, cv::COLOR_BGR2RGBA);
    unsigned char* image_data = image.data;
    int width = image.cols;
    int height = image.rows;
    bool ret = LoadTextureFromMemory(image_data, width, height, &my_texture);
    ImGui::Image((void*)my_texture, ImVec2(my_image_width, my_image_height));

bool LoadTextureFromMemory(unsigned char* data, int width, int height, ID3D11ShaderResourceView** out_srv)
 {
     D3D11_TEXTURE2D_DESC desc;
     ZeroMemory(&desc, sizeof(desc));
     desc.Width = width;
     desc.Height = height;
     desc.MipLevels = 1;
     desc.ArraySize = 1;
     desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
     desc.SampleDesc.Count = 1;
     desc.Usage = D3D11_USAGE_DEFAULT;
     desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
     desc.CPUAccessFlags = 0;

     D3D11_SUBRESOURCE_DATA subResource;
     subResource.pSysMem = data;
     subResource.SysMemPitch = width * 4;
     subResource.SysMemSlicePitch = 0;

     ID3D11Texture2D* pTexture = NULL;
     g_pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);

     D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
     ZeroMemory(&srvDesc, sizeof(srvDesc));
     srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
     srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
     srvDesc.Texture2D.MipLevels = desc.MipLevels;
     srvDesc.Texture2D.MostDetailedMip = 0;
     g_pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, out_srv);

     pTexture->Release();

     return true;
 }

[rygorous]

There is no usage of stb_image in the code you posted and it wouldn't be useful for what you're trying to do if it was.

If you have the data in a cv::Mat, it's already decoded raw pixels in memory. stb_image is for decoding formatted image files (like PNG or JPEG) from disk.