2026-10-16 04:18:00 +02:00
1 changed files with 3 additions and 1 deletions
@@ -29,7 +29,9 @@ var (
 const MaxDimension = imageprocessor.MaxOutputDimension

 // ValidateDimension checks one requested width or height; name ("width" or
-// "height") appears in the error. 0 means "original size" and is valid.
+// "height") appears in the error. 0 is valid: that side is then worked out from
+// the source's proportions and the other requested side, rounded down but at
+// least 1, or is the source's own side when the other side is 0 too.
 func ValidateDimension(name string, value int) error {
 	if value < 0 {
 		return fmt.Errorf("%w: %s is negative", ErrInvalidSize, name)