metaforce/specter/include/Specter/FontCache.hpp

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#ifndef SPECTER_FONTCACHE_HPP
#define SPECTER_FONTCACHE_HPP
#include <ft2build.h>
#include FT_FREETYPE_H
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#include <boo/boo.hpp>
#include <HECL/Runtime.hpp>
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#include <Athena/FileReader.hpp>
#include <Athena/FileWriter.hpp>
namespace Specter
{
class FontTag
{
friend class FontCache;
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uint64_t m_hash = 0;
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FontTag(const std::string& name, bool subpixel, float points, unsigned dpi);
public:
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FontTag() = default;
operator bool() const {return m_hash != 0;}
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uint64_t hash() const {return m_hash;}
bool operator==(const FontTag& other) const {return m_hash == other.m_hash;}
};
}
namespace std
{
template <> struct hash<Specter::FontTag>
{
size_t operator() (const Specter::FontTag& handle) const NOEXCEPT
{return size_t(handle.hash());}
};
}
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namespace Specter
{
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class FreeTypeGZipMemFace
{
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FT_Library m_lib;
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FT_StreamRec m_comp = {};
FT_StreamRec m_decomp = {};
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FT_Face m_face = nullptr;
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public:
FreeTypeGZipMemFace(FT_Library lib, const uint8_t* data, size_t sz);
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FreeTypeGZipMemFace(const FreeTypeGZipMemFace& other) = delete;
FreeTypeGZipMemFace& operator=(const FreeTypeGZipMemFace& other) = delete;
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~FreeTypeGZipMemFace() {close();}
void open();
void close();
operator FT_Face() {open(); return m_face;}
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};
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class FontAtlas
{
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friend class FontCache;
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FT_Face m_face;
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boo::ITextureSA* m_tex;
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uint32_t m_dpi;
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FT_Fixed m_ftXscale;
FT_UShort m_ftXPpem;
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public:
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struct Glyph
{
atUint32 m_unicodePoint;
atUint32 m_layerIdx;
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float m_layerFloat;
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float m_uv[4];
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atInt32 m_leftPadding;
atInt32 m_advance;
atInt32 m_rightPadding;
atUint32 m_width;
atUint32 m_height;
atInt32 m_verticalOffset;
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};
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private:
std::vector<Glyph> m_glyphs;
std::unordered_map<atUint16, std::vector<std::pair<atUint16, atInt16>>> m_kernAdjs;
struct TT_KernHead : Athena::io::DNA<Athena::BigEndian>
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{
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DECL_DNA
Value<atUint32> length;
Value<atUint16> coverage;
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};
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struct TT_KernSubHead : Athena::io::DNA<Athena::BigEndian>
{
DECL_DNA
Value<atUint16> nPairs;
Value<atUint16> searchRange;
Value<atUint16> entrySelector;
Value<atUint16> rangeShift;
};
struct TT_KernPair : Athena::io::DNA<Athena::BigEndian>
{
DECL_DNA
Value<atUint16> left;
Value<atUint16> right;
Value<atInt16> value;
};
void buildKernTable(FT_Face face);
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std::unordered_map<atUint32, size_t> m_glyphLookup;
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public:
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FontAtlas(boo::IGraphicsDataFactory* gf, FT_Face face, uint32_t dpi,
bool subpixel, Athena::io::FileWriter& writer);
FontAtlas(boo::IGraphicsDataFactory* gf, FT_Face face, uint32_t dpi,
bool subpixel, Athena::io::FileReader& reader);
FontAtlas(const FontAtlas& other) = delete;
FontAtlas& operator=(const FontAtlas& other) = delete;
uint32_t dpi() const {return m_dpi;}
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FT_Fixed FT_Xscale() const {return m_ftXscale;}
FT_UShort FT_XPPem() const {return m_ftXPpem;}
boo::ITexture* texture() const {return m_tex;}
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const Glyph* lookupGlyph(atUint32 charcode) const
{
auto search = m_glyphLookup.find(charcode);
if (search == m_glyphLookup.end())
return nullptr;
return &m_glyphs[search->second];
}
atInt16 lookupKern(atUint32 left, atUint32 right) const
{
auto leftSearch = m_glyphLookup.find(left);
if (leftSearch == m_glyphLookup.cend())
return 0;
size_t leftIdx = leftSearch->second;
auto rightSearch = m_glyphLookup.find(right);
if (rightSearch == m_glyphLookup.cend())
return 0;
size_t rightIdx = rightSearch->second;
auto pairSearch = m_kernAdjs.find(leftIdx);
if (pairSearch == m_kernAdjs.cend())
return 0;
for (const std::pair<atUint16, atInt16>& p : pairSearch->second)
if (p.first == rightIdx)
return p.second;
return 0;
}
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};
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class FontCache
{
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const HECL::Runtime::FileStoreManager& m_fileMgr;
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HECL::SystemString m_cacheRoot;
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struct Library
{
FT_Library m_lib;
Library();
~Library();
operator FT_Library() {return m_lib;}
} m_fontLib;
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FreeTypeGZipMemFace m_regFace;
FreeTypeGZipMemFace m_monoFace;
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std::unordered_map<FontTag, std::unique_ptr<FontAtlas>> m_cachedAtlases;
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public:
FontCache(const HECL::Runtime::FileStoreManager& fileMgr);
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FontCache(const FontCache& other) = delete;
FontCache& operator=(const FontCache& other) = delete;
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FontTag prepCustomFont(boo::IGraphicsDataFactory* gf,
const std::string& name, FT_Face face, bool subpixel=false,
float points=10.0, uint32_t dpi=72);
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FontTag prepMainFont(boo::IGraphicsDataFactory* gf,
bool subpixel=false, float points=10.0, uint32_t dpi=72)
{return prepCustomFont(gf, "droidsans-permissive", m_regFace, subpixel, points, dpi);}
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FontTag prepMonoFont(boo::IGraphicsDataFactory* gf,
bool subpixel=false, float points=10.0, uint32_t dpi=72)
{return prepCustomFont(gf, "bmonofont", m_monoFace, subpixel, points, dpi);}
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void closeBuiltinFonts() {m_regFace.close(); m_monoFace.close();}
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const FontAtlas& lookupAtlas(FontTag tag) const;
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};
}
#endif // SPECTER_FONTCACHE_HPP