76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
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package font
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import (
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"fmt"
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"log"
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"sync"
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"github.com/golang/freetype/truetype"
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fontlib "golang.org/x/image/font"
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"zworld/assets"
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"zworld/engine/util"
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)
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var parseCache map[string]*truetype.Font = make(map[string]*truetype.Font, 32)
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var faceCache map[string]T = make(map[string]T, 128)
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func loadTruetypeFont(filename string) (*truetype.Font, error) {
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// check parsed font cache
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if fnt, exists := parseCache[filename]; exists {
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return fnt, nil
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}
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fontBytes, err := assets.ReadAll(filename)
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if err != nil {
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return nil, fmt.Errorf("failed to load font: %w", err)
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}
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fnt, err := truetype.Parse(fontBytes)
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if err != nil {
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return nil, fmt.Errorf("failed to parse font: %w", err)
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}
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// add to cache
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parseCache[filename] = fnt
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return fnt, nil
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}
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func Load(filename string, size int, scale float32) T {
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key := fmt.Sprintf("%s:%dx%.2f", filename, size, scale)
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if font, exists := faceCache[key]; exists {
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return font
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}
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ttf, err := loadTruetypeFont(filename)
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if err != nil {
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panic(err)
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}
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name := ttf.Name(truetype.NameIDFontFullName)
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log.Printf("+ font %s %dpt x%.2f\n", name, size, scale)
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dpi := 72.0 * scale
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face := truetype.NewFace(ttf, &truetype.Options{
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Size: float64(size),
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DPI: float64(dpi),
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Hinting: fontlib.HintingFull,
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SubPixelsX: 8,
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SubPixelsY: 8,
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})
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fnt := &font{
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size: float32(size),
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scale: scale,
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name: name,
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face: face,
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glyphs: util.NewSyncMap[rune, *Glyph](),
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kern: util.NewSyncMap[runepair, float32](),
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drawer: &fontlib.Drawer{Face: face},
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mutex: &sync.Mutex{},
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}
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faceCache[key] = fnt
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return fnt
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}
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