/*
 * 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 "Text.hpp"
#include "fmt/core.h"
#include "msdfgen.h"
#include "msdfgen-ext.h"
#include "msdf-atlas-gen/msdf-atlas-gen.h"

namespace OpenVulkano::Scene
{
	using namespace msdfgen;
	using namespace msdf_atlas;

	void Text::Init(const std::string_view fontFile, char8_t symbol, const std::string_view outputFile)
	{
		FreetypeHandle *ft = initializeFreetype();
		if (!ft)
		{
			throw std::runtime_error("Failed to initialize freetype");
		}
		FontHandle *font = loadFont(ft, fontFile.data());
		if (!font)
		{
			deinitializeFreetype(ft);
			throw std::runtime_error(fmt::format("Failed to load font freetype from file {0}", fontFile.data()));
		}

		Shape shape;
		if (loadGlyph(shape, font, symbol, FONT_SCALING_EM_NORMALIZED))
		{
			shape.normalize();
			Bitmap<float, 1> sdf(m_cfg.outputSize, m_cfg.outputSize);
			// scale, translation (in em's)
			Projection proj(m_cfg.outputSize, Vector2(0.125, 0.125));
			// distance mapping
			Range rng(0.075);
			SDFTransformation t(proj, rng);
			generateSDF(sdf, shape, t);
			savePng(sdf, outputFile.data());
		}
		destroyFont(font);
		deinitializeFreetype(ft);
	}
}