build system and module refactoring + simple histogram scratch (#20)

* scratch adding histogram to image views

Histograms should come from some sort of histogram service. This is
currently just a POC.

* custom logger implementation w/o spdlog

* missing cmake file

* fix tests

* use operator<< over direct stream exposure

* rm print header

* add threading test + refactor towards interface libraries

omits the need for =target_include_directories= calls /everywhere/

* rm print header

* rm constexpr

* templated thread_pool

* fix doxyfile

* default enable doc building

* czi reader refactor

* rm erroneous include expression

* clang-format

* single lib include with PUBLIC visibility

* compile imgui stdlib

* clang format

* documentation update

centralize `LogLevelToString` to `ILog.hpp`

update docs and examples

lib/app/rendering/PixelariumImageViewCzi.cpp

@@ -2,11 +2,12 @@
 
 #include <format>
 #include <memory>
+#include <stdexcept>
 
 #include "CvMatRender.hpp"
+#include "IPixelariumImage.hpp"
+#include "PixelariumCzi.hpp"
 #include "RenderHelpers.hpp"
-#include "imaging/IPixelariumImage.hpp"
-#include "imaging/impl/PixelariumCzi.hpp"
 #include "imgui.h"
 
 void pixelarium::application::PixelariumImageViewCzi::RefreshCachedImage()
@@ -26,7 +27,7 @@ void pixelarium::application::PixelariumImageViewCzi::RefreshCachedImage()
 }
 
 pixelarium::application::PixelariumImageViewCzi::PixelariumImageViewCzi(std::shared_ptr<Image> img, const Log& log)
-    : log_(log), render_(std::make_unique<CvMatRender>(*img->TryGetImage()))
+    : log_(log)
 {
     img_ = img;
     auto czi_img = std::static_pointer_cast<imaging::PixelariumCzi>(this->img_);
@@ -39,6 +40,18 @@ pixelarium::application::PixelariumImageViewCzi::PixelariumImageViewCzi(std::sha
             return true;
         });
 
+    auto render_mat = img->TryGetImage();
+    if (render_mat.has_value())
+    {
+        this->render_ = std::make_unique<CvMatRender>(render_mat.value());
+    }
+    else
+    {
+        auto msg{std::format("{}: fetching image failed: {}", __PRETTY_FUNCTION__, img->Name())};
+        log_.Error(msg);
+        throw std::runtime_error(msg);
+    }
+
     // this->SetInitialSize();
     log_.Info(std::format("{}: dimension map size: {}", __PRETTY_FUNCTION__, dimension_map_.size()));
 }