FontData.h

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#pragma once
 
#include "common/Resource.h"
 
#include <cstdint>
#include <string>
#include <vector>
 
struct FT_FaceRec_;
typedef struct FT_FaceRec_ *FT_Face;
 
namespace eve {
namespace image {
class ImageData;
}
 
namespace font {
 
class FontData : public Resource {
public:
    FontData(std::vector<uint8_t> bytes, int pixelSize, std::string uri = "");
    ~FontData() override;
 
    int getSize() const;
    float getAscent() const;
    float getDescent() const;
    float getLineHeight() const;
    float getBaseline() const;
 
    std::string getFamilyName() const;
    std::string getStyleName() const;
    int getGlyphCount() const;
 
    bool hasGlyph(int codepoint) const;
    bool hasGlyphs(std::string text) const;
    float getWidth(std::string text) const;
    float getKerning(int leftCodepoint, int rightCodepoint) const;
 
    void adopt(eve::Resource &replacement) override;
 
    int getGlyphWidth(int codepoint) const;
    int getGlyphHeight(int codepoint) const;
    int getGlyphBearingX(int codepoint) const;
    int getGlyphBearingY(int codepoint) const;
    int getGlyphAdvance(int codepoint) const;
 
    image::ImageData *newGlyphImageData(int codepoint);
 
private:
    struct GlyphCache {
        int width = 0;
        int height = 0;
        int bearingX = 0;
        int bearingY = 0;
        int advance = 0;
        bool loaded = false;
        bool empty = true;
    };
 
    const GlyphCache &ensureGlyph(int codepoint) const;
    unsigned int glyphIndex(int codepoint) const;
 
    std::vector<uint8_t> bytes;
    FT_Face face = nullptr;
    int pixelSize = 16;
    mutable std::vector<GlyphCache> glyphCache;  // indexed by glyph index
};
 
}  // namespace font
}  // namespace eve