97 lines
2.7 KiB
C++
97 lines
2.7 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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#pragma once
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#include "Math/Math.hpp"
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#include "Scene/FreetypeHelper.hpp"
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#include <vector>
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#include <optional>
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namespace OpenVulkano::Scene
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{
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struct GlyphForPacking
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{
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uint32_t code;
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Math::Vector2i size;
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Math::Vector2d atlasPos;
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size_t firstGlyphByteInAtlas;
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};
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struct Shelf
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{
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inline static std::vector<Shelf> CreateShelves(uint32_t atlasWidth, std::vector<GlyphForPacking>& glyphs,
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const FtFaceRecPtr& face);
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Shelf(uint32_t width, uint32_t height) : m_width(width), m_height(height), m_remainingWidth(width) {}
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bool HasSpaceForGlyph(uint32_t glyphWidth, uint32_t glyphHeight) const
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{
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return m_remainingWidth >= glyphWidth && m_height >= glyphHeight;
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}
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uint32_t GetWidth() const { return m_width; }
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uint32_t GetHeight() const { return m_height; }
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uint32_t GetNextGlyphPos() const { return m_nextGlyphPos; };
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uint32_t GetOccupiedSize() const { return ((m_width - m_remainingWidth) * m_height); }
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std::optional<uint32_t> AddGlyph(uint32_t glyphWidth, uint32_t glyphHeight)
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{
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if (!HasSpaceForGlyph(glyphWidth, glyphHeight))
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{
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return {};
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}
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uint32_t insertionPos = m_nextGlyphPos;
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m_nextGlyphPos += glyphWidth;
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m_remainingWidth -= glyphWidth;
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return insertionPos;
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}
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private:
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uint32_t m_width;
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uint32_t m_height;
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uint32_t m_remainingWidth;
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uint32_t m_nextGlyphPos = 0;
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};
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std::vector<Shelf> Shelf::CreateShelves(uint32_t atlasWidth, std::vector<GlyphForPacking>& glyphs,
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const FtFaceRecPtr& face)
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{
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std::vector<Shelf> shelves;
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for (GlyphForPacking& glyph : glyphs)
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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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continue;
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}
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FT_GlyphSlot slot = face->glyph;
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bool needNewShelf = true;
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uint32_t totalPrevShelvesHeight = 0;
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for (Shelf& shelf : shelves)
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{
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if (std::optional<uint32_t> insertionPosX = shelf.AddGlyph(glyph.size.x, glyph.size.y))
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{
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glyph.firstGlyphByteInAtlas = *insertionPosX + (totalPrevShelvesHeight * atlasWidth);
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glyph.atlasPos.x = *insertionPosX;
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glyph.atlasPos.y = totalPrevShelvesHeight;
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needNewShelf = false;
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break;
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}
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totalPrevShelvesHeight += shelf.GetHeight();
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}
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if (needNewShelf)
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{
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shelves.emplace_back(atlasWidth, glyph.size.y);
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shelves.back().AddGlyph(glyph.size.x, glyph.size.y);
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glyph.firstGlyphByteInAtlas = totalPrevShelvesHeight * atlasWidth;
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glyph.atlasPos.x = 0;
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glyph.atlasPos.y = totalPrevShelvesHeight;
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}
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}
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return shelves;
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}
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}
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