109 lines
2.1 KiB
Go
109 lines
2.1 KiB
Go
// Copyright 2010 The draw2d Authors. All rights reserved.
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// created: 13/12/2010 by Laurent Le Goff
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package draw2d
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import (
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"io/ioutil"
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"log"
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"path"
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"path/filepath"
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"github.com/golang/freetype/truetype"
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)
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var (
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fontFolder = "../resource/font/"
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fonts = make(map[string]*truetype.Font)
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fontNamer FontFileNamer = FontFileName
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)
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// FontStyle defines bold and italic styles for the font
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// It is possible to combine values for mixed styles, eg.
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// FontData.Style = FontStyleBold | FontStyleItalic
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type FontStyle byte
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const (
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FontStyleNormal FontStyle = iota
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FontStyleBold
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FontStyleItalic
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)
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type FontFamily byte
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const (
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FontFamilySans FontFamily = iota
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FontFamilySerif
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FontFamilyMono
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)
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type FontData struct {
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Name string
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Family FontFamily
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Style FontStyle
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}
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type FontFileNamer func(fontData FontData) string
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func FontFileName(fontData FontData) string {
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fontFileName := fontData.Name
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switch fontData.Family {
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case FontFamilySans:
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fontFileName += "s"
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case FontFamilySerif:
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fontFileName += "r"
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case FontFamilyMono:
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fontFileName += "m"
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}
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if fontData.Style&FontStyleBold != 0 {
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fontFileName += "b"
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} else {
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fontFileName += "r"
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}
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if fontData.Style&FontStyleItalic != 0 {
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fontFileName += "i"
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}
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fontFileName += ".ttf"
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return fontFileName
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}
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func RegisterFont(fontData FontData, font *truetype.Font) {
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fonts[fontNamer(fontData)] = font
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}
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func GetFont(fontData FontData) *truetype.Font {
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fontFileName := fontNamer(fontData)
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font := fonts[fontFileName]
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if font != nil {
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return font
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}
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fonts[fontFileName] = loadFont(fontFileName)
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return fonts[fontFileName]
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}
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func GetFontFolder() string {
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return fontFolder
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}
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func SetFontFolder(folder string) {
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fontFolder = filepath.Clean(folder)
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}
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func SetFontNamer(fn FontFileNamer) {
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fontNamer = fn
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}
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func loadFont(fontFileName string) *truetype.Font {
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fontBytes, err := ioutil.ReadFile(path.Join(fontFolder, fontFileName))
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if err != nil {
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log.Println(err)
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return nil
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}
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font, err := truetype.Parse(fontBytes)
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if err != nil {
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log.Println(err)
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return nil
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}
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return font
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}
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