76 lines
1.2 KiB
Go
76 lines
1.2 KiB
Go
package gui
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import (
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"bytes"
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"io"
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"os"
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"golang.org/x/image/font"
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"golang.org/x/image/font/opentype"
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"golang.org/x/image/font/sfnt"
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)
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type Font struct {
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font *sfnt.Font
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faces map[int]font.Face
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}
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func LoadOpenTypeFont(otfFile string) (*Font, error) {
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ff, err := os.Open(otfFile)
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if err != nil {
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return nil, err
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}
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return LoadFontFromReaderAt(ff)
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}
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func LoadFontFromBytes(data []byte) (*Font, error) {
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return LoadFontFromReaderAt(bytes.NewReader(data))
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}
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func LoadFontFromReaderAt(r io.ReaderAt) (*Font, error) {
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fnt, err := opentype.ParseReaderAt(r)
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if err != nil {
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return nil, err
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}
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return &Font{
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font: fnt,
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faces: map[int]font.Face{},
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}, nil
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}
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func (f *Font) FaceErr(fontSize int) (face font.Face, err error) {
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if v, ok := f.faces[fontSize]; ok {
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return v, nil
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}
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face, err = opentype.NewFace(f.font, &opentype.FaceOptions{
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Size: float64(fontSize),
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DPI: 72,
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Hinting: font.HintingFull,
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})
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if err == nil {
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f.faces[fontSize] = face
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}
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return face, err
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}
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func (f *Font) Face(fontSize int) font.Face {
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face, err := f.FaceErr(fontSize)
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if err != nil {
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panic(err)
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}
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return face
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}
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func (f *Font) Close() error {
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for _, face := range f.faces {
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if err := face.Close(); err != nil {
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return err
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}
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}
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return nil
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}
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