106 lines
3.0 KiB
C++
106 lines
3.0 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include "FontAtlasGeneratorBase.hpp"
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#include "FontAtlas.hpp"
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#include "Base/Logger.hpp"
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#include <filesystem>
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namespace OpenVulkano::Scene
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{
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std::pair<FtLibraryRecPtr, FtFaceRecPtr>
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FontAtlasGeneratorBase::InitFreetype(const std::variant<std::string, Array<char>>& source)
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{
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FT_Library library;
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auto error = FT_Init_FreeType(&library);
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if (error)
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{
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throw std::runtime_error(fmt::format("Could not initalize freetype library. {}", GetFreetypeErrorDescription(error)));
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}
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FT_Face face;
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if (std::holds_alternative<std::string>(source))
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{
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error = FT_New_Face(library, std::get<0>(source).c_str(), 0, &face);
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}
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else
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{
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auto& arr = std::get<1>(source);
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error = FT_New_Memory_Face(library, (const FT_Byte*) (arr.Data()), arr.Size(), 0, &face);
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}
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if (error == FT_Err_Unknown_File_Format)
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{
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throw std::runtime_error("Unknown font file format\n");
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}
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else if (error)
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{
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throw std::runtime_error(fmt::format("Font file could not be opened or read or it's corrupted. {}", GetFreetypeErrorDescription(error)));
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}
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// some fancy font without unicode charmap
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if (face->charmap == nullptr)
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{
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throw std::runtime_error("Selected font doesn't contain unicode charmap");
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}
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return { FtLibraryRecPtr(library), FtFaceRecPtr(face) };
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}
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std::string FontAtlasGeneratorBase::GetFreetypeErrorDescription(FT_Error error)
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{
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if (const char* s = FT_Error_String(error))
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{
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return s;
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}
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return fmt::format("Error code is {}", error);
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}
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void FontAtlasGeneratorBase::SetGlyphData(GlyphInfo& info, Math::Vector2d bearing, Math::Vector2d size,
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const Math::AABB& aabb, double advance)
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{
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const auto& resolution = m_atlasData->GetTexture()->resolution;
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const double l = aabb.min.x;
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const double r = aabb.max.x;
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const double t = aabb.max.y;
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const double b = aabb.min.y;
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info.pos[0].x = bearing.x;
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info.pos[0].y = size.y - bearing.y;
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info.uv[0].x = l / resolution.x;
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info.uv[0].y = b / resolution.y;
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info.pos[1].x = bearing.x + size.x;
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info.pos[1].y = size.y - bearing.y;
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info.uv[1].x = r / resolution.x;
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info.uv[1].y = b / resolution.y;
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info.pos[2].x = bearing.x + size.x;
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info.pos[2].y = bearing.y;
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info.uv[2].x = r / resolution.x;
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info.uv[2].y = t / resolution.y;
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info.pos[3].x = bearing.x;
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info.pos[3].y = bearing.y;
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info.uv[3].x = l / resolution.x;
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info.uv[3].y = t / resolution.y;
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info.advance = advance;
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}
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std::set<uint32_t> FontAtlasGeneratorBase::LoadAllGlyphs(const std::variant<std::string, Array<char>>& data)
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{
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const auto& [lib, face] = InitFreetype(data);
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std::set<uint32_t> s;
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FT_UInt glyphIndex;
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FT_ULong unicode = FT_Get_First_Char(face.get(), &glyphIndex);
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while (glyphIndex != 0)
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{
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s.insert(unicode);
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unicode = FT_Get_Next_Char(face.get(), unicode, &glyphIndex);
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}
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return s;
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}
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}
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