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