OpenDiablo2/d2core/d2asset/font_manager.go

package d2asset

import (
	"fmt"
	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2cache"
	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
)

const (
	fontBudget = 64
)

// Static checks to confirm struct conforms to interface
var _ d2interface.FontManager = &fontManager{}
var _ d2interface.Cacher = &fontManager{}

type fontManager struct {
	cache d2interface.Cache
}

func createFontManager() d2interface.FontManager {
	return &fontManager{d2cache.CreateCache(fontBudget)}
}

// LoadFont loads a font from the archives managed by the ArchiveManager
func (fm *fontManager) LoadFont(tablePath, spritePath, palettePath string) (d2interface.Font,
	error) {
	cachePath := fmt.Sprintf("%s;%s;%s", tablePath, spritePath, palettePath)
	if font, found := fm.cache.Retrieve(cachePath); found {
		return font.(d2interface.Font), nil
	}

	font, err := loadFont(tablePath, spritePath, palettePath)
	if err != nil {
		return nil, err
	}

	if err := fm.cache.Insert(cachePath, font, 1); err != nil {
		return nil, err
	}

	return font, nil
}

// ClearCache clears the font cache
func (fm *fontManager) ClearCache() {
	fm.cache.Clear()
}

// GetCache returns the font managers cache
func (fm *fontManager) GetCache() d2interface.Cache {
	return fm.cache
}