113 lines
4.7 KiB
C++
113 lines
4.7 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 "BitmapFontAtlasGenerator.hpp"
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#include "Base/Logger.hpp"
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namespace OpenVulkano::Scene
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{
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void BitmapFontAtlasGenerator::GenerateAtlas(const std::string& fontFile, const std::set<uint32_t>& charset,
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const std::optional<std::string>& pngOutput)
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{
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Generate(fontFile, charset, pngOutput);
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}
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void BitmapFontAtlasGenerator::GenerateAtlas(const Array<char>& fontData, const std::set<uint32_t>& charset,
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const std::optional<std::string>& pngOutput)
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{
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Generate(fontData, charset, pngOutput);
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}
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void BitmapFontAtlasGenerator::Generate(const std::variant<std::string, Array<char>>& source,
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const std::set<uint32_t>& chset,
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const std::optional<std::string>& pngOutput)
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{
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if (chset.empty())
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{
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Logger::APP->info("Charset is empty. Nothing to generate.");
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return;
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}
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m_atlasData = std::make_shared<AtlasData>();
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const auto& [lib, face] = FontAtlasGeneratorBase::InitFreetype(source);
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FT_Set_Pixel_Sizes(face.get(), 0, m_pixelSizeConfig.CalculatePixelSize());
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auto [allGlyphs, area] = InitGlyphsForPacking(chset, face);
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const double atlasWidth = ceil(sqrt(area));
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std::vector<Shelf> shelves = Shelf::CreateShelves(atlasWidth, allGlyphs, face);
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uint32_t atlasHeight = 0;
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std::for_each(shelves.begin(), shelves.end(), [&](const Shelf& shelf) { atlasHeight += shelf.GetHeight(); });
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const Math::Vector2ui atlasResolution = { atlasWidth, atlasHeight };
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// same as in msdfgen lib by default. see import-font.h for reference
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// TODO: probably also support keeping coordinates as the integer values native to the font file
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// but since some algorithms have already been implemented for EM_NORMALIZED mode, currently there is no support for default font metrics (ints)
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// The coordinates will be normalized to the em size, i.e. 1 = 1 em
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const double scaleFactor = (1. / face->units_per_EM);
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SetupAtlasData(atlasResolution, face->height * scaleFactor, FontAtlasType::BITMAP);
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size_t loadedGlyphs = 0;
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for (const GlyphForPacking& glyph : allGlyphs)
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{
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FT_Error error = FT_Load_Char(face.get(), glyph.code, FT_LOAD_RENDER);
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if (error)
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{
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Logger::SCENE->error("FT_Load_Char for codepoint {} has failed. {}", glyph.code,
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GetFreetypeErrorDescription(error));
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continue;
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}
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FT_GlyphSlot slot = face->glyph;
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for (int row = 0; row < slot->bitmap.rows; row++)
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{
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std::memcpy(&m_atlasData->img->data[glyph.firstGlyphByteInAtlas + row * atlasResolution.x],
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&slot->bitmap.buffer[(slot->bitmap.rows - 1 - row) * slot->bitmap.pitch],
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slot->bitmap.width);
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}
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GlyphInfo& glyphInfo = m_atlasData->glyphs[glyph.code];
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const Math::Vector2d glyphMetrics = { slot->metrics.width * scaleFactor,
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slot->metrics.height * scaleFactor };
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const Math::Vector2d glyphBearing = { slot->metrics.horiBearingX * scaleFactor,
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slot->metrics.horiBearingY * scaleFactor };
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Math::AABB glyphAtlasAABB(Math::Vector3f(glyph.atlasPos.x, glyph.atlasPos.y, 0), Math::Vector3f(glyph.atlasPos.x + slot->bitmap.width, glyph.atlasPos.y + slot->bitmap.rows, 0));
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SetGlyphData(glyphInfo, glyphBearing, glyphMetrics, glyphAtlasAABB, slot->advance.x * scaleFactor);
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loadedGlyphs++;
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}
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if (pngOutput)
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{
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SavePng(*pngOutput);
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}
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Logger::SCENE->debug("Created atlas with {} glyphs, {} glyphs could not be loaded", loadedGlyphs, chset.size() - loadedGlyphs);
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}
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std::pair<std::vector<GlyphForPacking>, double>
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BitmapFontAtlasGenerator::InitGlyphsForPacking(const std::set<uint32_t>& chset, const FtFaceRecPtr& face)
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{
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FT_Error error = 0;
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double area = 0;
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std::vector<GlyphForPacking> allGlyphs;
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allGlyphs.reserve(chset.size());
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for (uint32_t codepoint : chset)
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{
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error = FT_Load_Char(face.get(), codepoint, FT_LOAD_RENDER);
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if (error)
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{
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Logger::SCENE->error("FT_Load_Char for codepoint {} has failed. {}", codepoint,
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GetFreetypeErrorDescription(error));
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continue;
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}
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FT_GlyphSlot slot = face->glyph;
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GlyphForPacking& glyph = allGlyphs.emplace_back(codepoint, Math::Vector2ui(slot->bitmap.width, slot->bitmap.rows));
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area += slot->bitmap.rows * slot->bitmap.width;
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}
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std::sort(allGlyphs.begin(), allGlyphs.end(),
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[](const GlyphForPacking& a, const GlyphForPacking& b) { return a.size.y > b.size.y; });
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return { allGlyphs, area };
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}
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}
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