Add a fallback face set

internal/faces/fallback/face.go

@@ -0,0 +1,35 @@
+package fallbackFaces
+
+import "golang.org/x/image/font"
+import "git.tebibyte.media/tomo/tomo"
+import "golang.org/x/image/font/basicfont"
+import "git.tebibyte.media/tomo/backend/style"
+
+type faceSet struct {
+	regular    font.Face
+	bold       font.Face
+	italic     font.Face
+	boldItalic font.Face
+}
+
+// New creates a new fallback face set.
+func New () style.FaceSet {
+	// TODO maybe pre-generate different variations of this face
+	return &faceSet {
+		regular:    basicfont.Face7x13,
+		bold:       basicfont.Face7x13,
+		italic:     basicfont.Face7x13,
+		boldItalic: basicfont.Face7x13,
+	}
+}
+
+func (this *faceSet) Face (face tomo.Face) font.Face {
+	bold   := face.Weight >= 500
+	italic := face.Italic >= 0.1 || face.Slant >= 0.1
+	switch {
+	case bold && italic: return this.boldItalic
+	case bold:           return this.bold
+	case italic:         return this.italic
+	default:             return this.regular
+	}
+}

internal/icons/fallback/icon.go

@@ -412,23 +412,23 @@ func generateSource (data []byte, width int) map[tomo.Icon] canvas.Texture {
 	return source
 }
 
-type iconTheme struct {
+type iconSet struct {
 	texturesSmall map[tomo.Icon] canvas.Texture
 	texturesLarge map[tomo.Icon] canvas.Texture
 }
 
-// New creates a new fallback icon theme.
+// New creates a new fallback icon set.
 func New () style.IconSet {
-	return new(iconTheme)
+	return new(iconSet)
 }
 
-func (this *iconTheme) ensure () {
+func (this *iconSet) ensure () {
 	if this.texturesSmall != nil { return }
 	this.texturesSmall = generateSource(atlasSmallBytes, 16)
 	this.texturesLarge = generateSource(atlasLargeBytes, 32)
 }
 
-func (this *iconTheme) selectSource (size tomo.IconSize) map[tomo.Icon] canvas.Texture {
+func (this *iconSet) selectSource (size tomo.IconSize) map[tomo.Icon] canvas.Texture {
 	if size == tomo.IconSizeSmall {
 		return this.texturesSmall
 	} else {
@@ -436,7 +436,7 @@ func (this *iconTheme) selectSource (size tomo.IconSize) map[tomo.Icon] canvas.T
 	}
 }
 
-func (this *iconTheme) Icon (icon tomo.Icon, size tomo.IconSize) canvas.Texture {
+func (this *iconSet) Icon (icon tomo.Icon, size tomo.IconSize) canvas.Texture {
 	this.ensure()
 	source := this.selectSource(size)
 	if texture, ok := source[icon]; ok {
@@ -445,7 +445,7 @@ func (this *iconTheme) Icon (icon tomo.Icon, size tomo.IconSize) canvas.Texture
 	return nil
 }
 
-func (this *iconTheme) MimeIcon (mime data.Mime, size tomo.IconSize) canvas.Texture {
+func (this *iconSet) MimeIcon (mime data.Mime, size tomo.IconSize) canvas.Texture {
 	this.ensure()
 	source := this.selectSource(size)
 	if mime == data.M("inode", "directory") {