Throw an exception if a parameter is missing for FillMax.

src/Drivers/Imagick/ImagickDriver.php

@@ -22,6 +22,7 @@
 use Spatie\Image\Enums\FlipDirection;
 use Spatie\Image\Enums\Orientation;
 use Spatie\Image\Exceptions\InvalidFont;
+use Spatie\Image\Exceptions\MissingParameter;
 use Spatie\Image\Exceptions\UnsupportedImageFormat;
 use Spatie\Image\Point;
 use Spatie\Image\Size;
@@ -132,6 +133,10 @@ public function fit(
         }
 
         if ($fit === Fit::FillMax) {
+            if (is_null($desiredWidth) || is_null($desiredHeight)) {
+                throw new MissingParameter('Both desiredWidth and desiredHeight must be set when using Fit::FillMax');
+            }
+
             return $this->fitFillMax($desiredWidth, $desiredHeight, $backgroundColor);
         }
 
@@ -153,7 +158,7 @@ public function fit(
         return $this;
     }
 
-    public function fitFillMax(?int $desiredWidth = null, ?int $desiredHeight = null, ?string $backgroundColor = null, ?bool $relative = false): static
+    public function fitFillMax(int $desiredWidth, int $desiredHeight, string $backgroundColor, bool $relative = false): static
     {
         $this->resize($desiredWidth, $desiredHeight, [Constraint::PreserveAspectRatio]);
         $this->resizeCanvas($desiredWidth, $desiredHeight, AlignPosition::Center, $relative, $backgroundColor);