reduce size to 56x56 and add a black border around images

plugins/palette.go

@@ -15,7 +15,7 @@ type Palette struct {
 
 // Descr describes this plugin
 func (h *Palette) Descr() string {
-	return "Creates an solid 256x56 image of the color specified."
+	return "Creates an solid 56x56 image of the color specified."
 }
 
 // Re is the regex for matching color messages.
@@ -44,11 +44,29 @@ func (h *Palette) parseHexColor(s string) (*color.RGBA, error) {
 	return c, nil
 }
 
+func isEdge(x, y int) bool {
+	if x == 0 || x == 55 {
+		return true
+	}
+
+	if y == 0 || y == 55 {
+		return true
+	}
+
+	return false
+}
+
 // RespondText to color request events
 func (h *Palette) RespondText(c *gomatrix.Client, ev *gomatrix.Event, user, post string) {
-	const width, height = 256, 56
+	const width, height = 56, 56
 
-	img := image.NewRGBA(image.Rect(0, 0, 256, 56))
+	img := image.NewRGBA(image.Rect(0, 0, 56, 56))
+	border := &color.RGBA{
+		R: 0x00,
+		G: 0x00,
+		B: 0x00,
+		A: 0xff,
+	}
 	color, err := h.parseHexColor(post)
 	if err != nil {
 		fmt.Println(err)
@@ -57,7 +75,11 @@ func (h *Palette) RespondText(c *gomatrix.Client, ev *gomatrix.Event, user, post
 
 	for y := 0; y < height; y++ {
 		for x := 0; x < width; x++ {
-			img.Set(x, y, color)
+			if isEdge(x, y) {
+				img.Set(x, y, border)
+			} else {
+				img.Set(x, y, color)
+			}
 		}
 	}