feat: expose vertical/horizontal alignment and max font size to metadata yamls

server/meme/text_slot.go

@@ -1,6 +1,7 @@
 package meme
 
 import (
+	"fmt"
 	"image"
 	"image/color"
 	"image/draw"
@@ -20,6 +21,19 @@ const (
 	Right  HorizontalAlignment = 1
 )
 
+func ParseHorizontalAlignment(s string) (HorizontalAlignment, error) {
+	switch s {
+	case "left":
+		return Left, nil
+	case "center":
+		return Center, nil
+	case "right":
+		return Right, nil
+	default:
+		return 0, fmt.Errorf("invalid horizontal alignment: %s", s)
+	}
+}
+
 type VerticalAlignment int
 
 const (
@@ -28,6 +42,19 @@ const (
 	Bottom VerticalAlignment = 1
 )
 
+func ParseVerticalAlignment(s string) (VerticalAlignment, error) {
+	switch s {
+	case "top":
+		return Top, nil
+	case "middle":
+		return Middle, nil
+	case "bottom":
+		return Bottom, nil
+	default:
+		return 0, fmt.Errorf("invalid vertical alignment: %s", s)
+	}
+}
+
 type TextSlot struct {
 	Bounds              image.Rectangle
 	Font                *truetype.Font

server/memelibrary/metadata.go

@@ -20,12 +20,15 @@ type Pattern struct {
 }
 
 type Slot struct {
-	X         int
-	Y         int
-	Width     int
-	Height    int
-	Font      string
-	TextColor []int `yaml:"text_color"`
+	X                   int
+	Y                   int
+	Width               int
+	Height              int
+	Font                string
+	TextColor           []int   `yaml:"text_color"`
+	HorizontalAlignment string  `yaml:"halign"`
+	VerticalAlignment   string  `yaml:"valign"`
+	MaxFontSize         float64 `yaml:"max_font_size"`
 }
 
 type Metadata struct {
@@ -76,6 +79,26 @@ func (m *Metadata) TextSlots(bounds image.Rectangle) (slots []*meme.TextSlot) {
 			if c := sliceToColor(slot.TextColor); c != nil {
 				textSlot.TextColor = c
 			}
+
+			var err error
+			if slot.HorizontalAlignment != "" {
+				textSlot.HorizontalAlignment, err = meme.ParseHorizontalAlignment(slot.HorizontalAlignment)
+				if err != nil {
+					panic(err)
+				}
+			}
+
+			if slot.VerticalAlignment != "" {
+				textSlot.VerticalAlignment, err = meme.ParseVerticalAlignment(slot.VerticalAlignment)
+				if err != nil {
+					panic(err)
+				}
+			}
+
+			if slot.MaxFontSize != 0 {
+				textSlot.MaxFontSize = slot.MaxFontSize
+			}
+
 			slots = append(slots, textSlot)
 		}
 		return