add avif support

closes #260

Signed-off-by: bnomei <b@bnomei.com>

.gitattributes

@@ -0,0 +1,4 @@
+/examples           export-ignore
+/.github            export-ignore
+/.gitattributes     export-ignore
+/.gitignore         export-ignore

README.md

@@ -42,7 +42,7 @@ try {
 
 ## Features
 
-- Supports reading, writing, and converting GIF, JPEG, PNG, WEBP, BMP formats.
+- Supports reading, writing, and converting GIF, JPEG, PNG, WEBP, BMP, AVIF formats.
 - Reads and writes files, data URIs, and image strings.
 - Manipulation: crop, resize, overlay/watermark, adding TTF text
 - Drawing: arc, border, dot, ellipse, line, polygon, rectangle, rounded rectangle

src/claviska/SimpleImage.php

@@ -316,7 +316,18 @@ protected function generate($mimeType = null, $quality = 100) {
           );
         }
         imageinterlace($this->image, true);
-        imagebmp($this->image, null, $quality);
+        imagebmp($this->image, null, $quality < 100);
+        break;
+      case 'image/avif':
+        // Not all versions of PHP support avif
+        if(!function_exists('imageavif')) {
+          throw new \Exception(
+            'AVIF support is not available in your version of PHP.',
+            self::ERR_UNSUPPORTED_FORMAT
+          );
+        }
+        imageinterlace($this->image, true);
+        imageavif($this->image, null, $quality);
         break;
       default:
         throw new \Exception('Unsupported format: ' . $mimeType, self::ERR_UNSUPPORTED_FORMAT);