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font_filetype.go
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/
font_filetype.go
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package common
import (
"fmt"
"io"
"io/ioutil"
"engo.io/engo"
"github.com/golang/freetype"
"github.com/golang/freetype/truetype"
)
// FontResource is a wrapper for `*truetype.Font` which is being passed by the the `engo.Files.Resource` method in the
// case of `.ttf` files.
type FontResource struct {
Font *truetype.Font
url string
}
func (f FontResource) URL() string {
return f.url
}
// fontLoader is responsible for managing `.ttf` files within `engo.Files`
type fontLoader struct {
fonts map[string]FontResource
}
// Load processes the data stream and parses it as a freetype font
func (i *fontLoader) Load(url string, data io.Reader) error {
ttfBytes, err := ioutil.ReadAll(data)
if err != nil {
return err
}
ttf, err := freetype.ParseFont(ttfBytes)
if err != nil {
return err
}
i.fonts[url] = FontResource{Font: ttf, url: url}
return nil
}
// Load removes the preloaded font from the cache
func (i *fontLoader) Unload(url string) error {
delete(i.fonts, url)
return nil
}
// Resource retrieves the preloaded font, passed as a `FontResource`
func (i *fontLoader) Resource(url string) (engo.Resource, error) {
texture, ok := i.fonts[url]
if !ok {
return nil, fmt.Errorf("resource not loaded by `FileLoader`: %q", url)
}
return texture, nil
}
func init() {
engo.Files.Register(".ttf", &fontLoader{fonts: make(map[string]FontResource)})
}