Add reset and hasImage methods and make generate public (#339)

* Add reset and hasImage methods

* Make generate method public

* Update README

README.md

@@ -187,6 +187,15 @@ Generates an image string.
 
 Returns a SimpleImage object.
 
+#### `generate($mimeType, $options)`
+
+Generates an image.
+
+- `$mimeType` (string) - The image format to output as a mime type (defaults to the original mime type).
+- `$options` (array|int) - Array of options or Image quality as a percentage (default 100).
+
+Returns an array: [mimeType, data]
+
 #### Options array
 
 Instead of providing the quality as an integer as the last function parameter you can also set various options depending on the targeted Mime type using an associative array.
@@ -296,6 +305,18 @@ Gets the image's current width.
 
 Returns the width as an integer.
 
+#### `hasImage()`
+
+Checks if the SimpleImage object has loaded an image.
+
+Returns a boolean.
+
+#### `reset()`
+
+Destroys the image resource.
+
+Returns a SimpleImage object.
+
 ### Manipulation
 
 #### `autoOrient()`

src/claviska/SimpleImage.php

@@ -116,15 +116,33 @@ public function __construct(string $image = '', array $flags = [])
      */
     public function __destruct()
     {
-        if ($this->image instanceof GdImage) {
-            imagedestroy($this->image);
-        }
+        $this->reset();
     }
 
     //////////////////////////////////////////////////////////////////////////////////////////////////
     // Helper functions
     //////////////////////////////////////////////////////////////////////////////////////////////////
 
+    /**
+     * Checks if the SimpleImage object has loaded an image.
+     */
+    public function hasImage(): bool
+    {
+        return $this->image instanceof GdImage;
+    }
+
+    /**
+     * Destroys the image resource.
+     */
+    public function reset(): static
+    {
+        if ($this->hasImage()) {
+            imagedestroy($this->image);
+        }
+
+        return $this;
+    }
+
     /**
      * Set flag value.
      *
@@ -313,7 +331,7 @@ public function fromString(string $string): SimpleImage|static
      *
      * @throws Exception Thrown when WEBP support is not enabled or unsupported format.
      */
-    protected function generate(string $mimeType = null, array|int $options = []): array
+    public function generate(string $mimeType = null, array|int $options = 100): array
     {
         // Format defaults to the original mime type
         $mimeType = $mimeType ?: $this->mimeType;