62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
// Copyright 2016 Minho. All rights reserved.
|
|
// Copyright 2021 Flamego. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package captchautil
|
|
|
|
import (
|
|
"embed"
|
|
"path"
|
|
"sync"
|
|
|
|
"github.com/golang/freetype"
|
|
"github.com/golang/freetype/truetype"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
//go:embed fonts/*.ttf
|
|
var fonts embed.FS
|
|
|
|
var (
|
|
fontFamilyNames []string
|
|
fontFamilies map[string]*truetype.Font
|
|
fontFamilyOnce sync.Once
|
|
fontFamilyErr error
|
|
)
|
|
|
|
func randFontFamily() (*truetype.Font, error) {
|
|
fontFamilyOnce.Do(func() {
|
|
files, err := fonts.ReadDir("fonts")
|
|
if err != nil {
|
|
fontFamilyErr = errors.Wrap(err, "read directory")
|
|
return
|
|
}
|
|
|
|
fontFamilyNames = make([]string, 0, len(files))
|
|
fontFamilies = make(map[string]*truetype.Font, len(files))
|
|
for _, fi := range files {
|
|
data, err := fonts.ReadFile(path.Join("fonts", fi.Name()))
|
|
if err != nil {
|
|
fontFamilyErr = errors.Wrapf(err, "read file %q", fi.Name())
|
|
return
|
|
}
|
|
|
|
f, err := freetype.ParseFont(data)
|
|
if err != nil {
|
|
fontFamilyErr = errors.Wrapf(err, "parse font %q", fi.Name())
|
|
return
|
|
}
|
|
|
|
fontFamilyNames = append(fontFamilyNames, fi.Name())
|
|
fontFamilies[fi.Name()] = f
|
|
}
|
|
})
|
|
|
|
if fontFamilyErr != nil {
|
|
return nil, fontFamilyErr
|
|
}
|
|
|
|
name := fontFamilyNames[r.Intn(len(fontFamilyNames))]
|
|
return fontFamilies[name], nil
|
|
}
|