rendering tests fixed

internal/generator/text.go

@@ -87,9 +87,8 @@ func NewTextOverlay(text string, frameW, frameH, posX, posY int, textPos string,
 		return nil, fmt.Errorf("text: box %dpx wider than frame %dpx", w, frameW)
 	}
 	h := 2*padY + textH
-	const topMargin = 48
-	if topMargin+h > frameH {
-		return nil, fmt.Errorf("text: box %dpx does not fit frame height %dpx", topMargin+h, frameH)
+	if h > frameH {
+		return nil, fmt.Errorf("text: box %dpx higher than frame %dpx", h, frameH)
 	}
 
 	if textPos != "" {
@@ -120,6 +119,18 @@ func NewTextOverlay(text string, frameW, frameH, posX, posY int, textPos string,
 			posY = frameH - h
 		}
 	}
+	if posX < 0 || posY < 0 {
+		return nil, fmt.Errorf("text: position (%d, %d) must not be negative", posX, posY)
+	}
+	if posX%6 != 0 {
+		return nil, fmt.Errorf("text: x position %d must be divisible by 6 for v210", posX)
+	}
+	if posX+w > frameW || posY+h > frameH {
+		return nil, fmt.Errorf(
+			"text: box at (%d, %d), size %dx%d, does not fit frame %dx%d",
+			posX, posY, w, h, frameW, frameH,
+		)
+	}
 	o := &TextOverlay{
 		frameW: frameW,
 		x:      posX,