Add UiFont class

openVulkanoCpp/Scene/UI/UiFont.cpp

@@ -0,0 +1,47 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "UiFont.hpp"
+#include <Base/Logger.hpp>
+#include "Host/FontResolver.hpp"
+#include <map>
+#include <imgui.h>
+
+namespace OpenVulkano::Scene::UI
+{
+	void UiFont::SetActive()
+	{
+		if (!m_font) MakeFont();
+		if (m_font) ImGui::PushFont(m_font);
+	}
+
+	void UiFont::MakeFont()
+	{
+		if (m_pixelSize <= 0 || m_font) return;
+		auto fontData = FontResolver::GetFontData(m_name);
+		if (!fontData)
+		{
+			Logger::APP->warn("Failed to find font {}", m_name);
+			m_pixelSize = 0;
+			return;
+		}
+		ImFontConfig conf;
+		strlcpy(conf.Name, m_name.data(), std::min(m_name.size(), sizeof(conf.Name)));
+		conf.FontDataOwnedByAtlas = false;
+		conf.RasterizerDensity = 3; // TODO check window scale factor
+		ImGuiIO& io = ImGui::GetIO();
+		m_font = io.Fonts->AddFontFromMemoryTTF(fontData.Data(), static_cast<int>(fontData.Size()), m_pixelSize, &conf);
+	}
+
+	UiFont* UiFont::GetFont(const std::string& fontName, int pixelSize)
+	{
+		static std::map<std::pair<std::string, int>, UiFont> FONTS;
+		UiFont& font = FONTS[{fontName, pixelSize}];
+		if (font.m_pixelSize != pixelSize) font = UiFont(fontName, (float)pixelSize);
+		font.MakeFont();
+		return &font;
+	}
+}