add imgui stylign window + change how texture filters are applied

src/main.cpp

@@ -55,8 +55,29 @@ int main(int argc, char** argv) {
 	IMGUI_CHECKVERSION();
 	ImGui::CreateContext();
 
-	//ImGui::StyleColorsDark();
-	setThemeGreen();
+	if (SDL_GetSystemTheme() == SDL_SYSTEM_THEME_LIGHT) {
+		ImGui::StyleColorsLight();
+	} else {
+		//ImGui::StyleColorsDark();
+		setThemeGreen();
+	}
+
+	{
+		ImGui::GetIO().Fonts->ClearFonts();
+		ImFontConfig fontcfg;
+
+		// upsampling to int looks almost ok
+		const float font_size_scale = 1.3f;
+		const float font_oversample = 4.f;
+
+		// default font is pixel perfect at 13
+		fontcfg.SizePixels = 13.f * font_size_scale;
+		fontcfg.RasterizerDensity = font_oversample/font_size_scale;
+		// normally density would be set to dpi scale of the display
+
+		ImGui::GetIO().Fonts->AddFontDefault(&fontcfg);
+		ImGui::GetIO().Fonts->Build();
+	}
 
 	ImGui_ImplSDL3_InitForSDLRenderer(window.get(), renderer.get());
 	auto imgui_sdl_scope = std::async(std::launch::deferred, &ImGui_ImplSDL3_Shutdown);

src/main_screen.cpp

@@ -191,6 +191,12 @@ Screen* MainScreen::render(float time_delta, bool&) {
 
 					ImGui::EndMenu();
 				}
+				if (ImGui::BeginMenu("Settings")) {
+					if (ImGui::MenuItem("ImGui Style Editor")) {
+						_show_tool_style_editor = true;
+					}
+					ImGui::EndMenu();
+				}
 				ImGui::EndMenuBar();
 			}
 
@@ -198,6 +204,12 @@ Screen* MainScreen::render(float time_delta, bool&) {
 		ImGui::End();
 	}
 
+	if (_show_tool_style_editor) {
+		if (ImGui::Begin("Dear ImGui Style Editor", &_show_tool_style_editor)) {
+			ImGui::ShowStyleEditor();
+		}
+		ImGui::End();
+	}
 
 	if constexpr (false) {
 		ImGui::ShowDemoWindow();

src/main_screen.hpp

@@ -64,6 +64,8 @@ struct MainScreen final : public Screen {
 	ToxUIUtils tuiu;
 	ToxDHTCapHisto tdch;
 
+	bool _show_tool_style_editor {false};
+
 	bool _window_hidden {false};
 	bool _window_hidden_ts {0};
 	float _time_since_event {0.f};

src/sdlrenderer_texture_uploader.cpp

@@ -7,7 +7,7 @@ SDLRendererTextureUploader::SDLRendererTextureUploader(SDL_Renderer* renderer_)
 {
 }
 
-uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height) {
+uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height, Filter filter) {
 	// TODO: test if pitch is 4 or 4*width
 	SDL_Surface* surf = SDL_CreateSurfaceFrom(
 		(void*)data,
@@ -20,6 +20,12 @@ uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t wi
 	SDL_Texture* tex = SDL_CreateTextureFromSurface(renderer, surf);
 	assert(tex); // TODO: add error reporting
 
+	if (filter == NEAREST) {
+		SDL_SetTextureScaleMode(tex, SDL_SCALEMODE_NEAREST);
+	} else if (filter == LINEAR) {
+		SDL_SetTextureScaleMode(tex, SDL_SCALEMODE_LINEAR);
+	}
+
 	SDL_DestroySurface(surf);
 
 	return reinterpret_cast<uint64_t>(tex);

src/sdlrenderer_texture_uploader.hpp

@@ -10,7 +10,7 @@ struct SDLRendererTextureUploader : public TextureUploaderI {
 	SDLRendererTextureUploader(SDL_Renderer* renderer_);
 	~SDLRendererTextureUploader(void) = default;
 
-	uint64_t uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height) override;
+	uint64_t uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height, Filter filter) override;
 	void destroy(uint64_t tex_id) override;
 };
 

src/settings_window.cpp

@@ -116,7 +116,6 @@ void SettingsWindow::render(void) {
 				}
 				ImGui::EndMenuBar();
 			}
-
 		}
 		ImGui::End();
 	}

src/texture_uploader.hpp

@@ -5,10 +5,14 @@
 struct TextureUploaderI {
 	static constexpr const char* version {"1"};
 
+	enum Filter {
+		NEAREST,
+		LINEAR,
+	};
+
 	virtual ~TextureUploaderI(void) {}
 
-	//virtual uint64_t uploadRGBA(const uint8_t* data, uint64_t data_size) = 0;
-	virtual uint64_t uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height) = 0;
+	virtual uint64_t uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height, Filter filter = LINEAR) = 0;
 
 	virtual void destroy(uint64_t tex_id) = 0;
 };

src/tox_avatar_loader.cpp

@@ -203,7 +203,7 @@ std::optional<TextureEntry> ToxAvatarLoader::load(TextureUploaderI& tu, Contact3
 	new_entry.timestamp_last_rendered = Message::getTimeMS();
 	new_entry.current_texture = 0;
 
-	const auto n_t = tu.uploadRGBA(pixels.data(), 5, 5);
+	const auto n_t = tu.uploadRGBA(pixels.data(), 5, 5, TextureUploaderI::NEAREST);
 	new_entry.textures.push_back(n_t);
 	new_entry.frame_duration.push_back(250);