Support AVIF in GD driver (requires PHP 8.1)

src/Gd/Drawer.php

@@ -446,7 +446,7 @@ private function getColor(ColorInterface $color)
             throw new InvalidArgumentException('GD driver only supports RGB colors');
         }
 
-        $gdColor = imagecolorallocatealpha($this->resource, $color->getRed(), $color->getGreen(), $color->getBlue(), (100 - $color->getAlpha()) * 127 / 100);
+        $gdColor = imagecolorallocatealpha($this->resource, $color->getRed(), $color->getGreen(), $color->getBlue(), round((100 - $color->getAlpha()) * 127 / 100));
         if ($gdColor === false) {
             throw new RuntimeException(sprintf('Unable to allocate color "RGB(%s, %s, %s)" with transparency of %d percent', $color->getRed(), $color->getGreen(), $color->getBlue(), $color->getAlpha()));
         }

src/Gd/Image.php

@@ -608,6 +608,26 @@ private function saveOrOutput($format, array $options, $filename = null)
         $args = array(&$this->resource, $filename);
 
         switch ($format) {
+            case 'avif':
+                // ranges from 0 (worst quality, smaller file) to 100 (best quality, larger file). If -1 is provided, the default value is used
+                $quality = -1;
+                // ranges from 0 (slow, smaller file) to 10 (fast, larger file). If -1 is provided, the default value is used
+                $speed = -1;
+                if (!empty($options[$format . '_lossless'])) {
+                    $quality = 100;
+                } else {
+                    if (!isset($options[$format . '_quality'])) {
+                        if (isset($options['quality'])) {
+                            $options[$format . '_quality'] = $options['quality'];
+                        }
+                    }
+                    if (isset($options[$format . '_quality'])) {
+                        $quality = max(0, min(100, $options[$format . '_quality']));
+                    }
+                }
+                $args[] = $quality;
+                $args[] = $speed;
+                break;
             case 'bmp':
                 if (isset($options['compressed'])) {
                     $args[] = (bool) $options['compressed'];
@@ -812,6 +832,9 @@ private static function getSupportedFormats()
             if (function_exists('imagewebp')) {
                 $supportedFormats['webp'] = array('mimeType' => 'image/webp');
             }
+            if (function_exists('imageavif') && function_exists('imagecreatefromavif')) {
+                $supportedFormats['avif'] = array('mimeType' => 'image/avif');
+            }
             ksort($supportedFormats);
         }
 

tests/tests/Gd/ImageTest.php

@@ -193,7 +193,10 @@ public function testSaveCompressionQuality($format, array $smallSizeOptions, arr
         if ($format === 'webp' && !function_exists('imagewebp')) {
             $this->markTestSkipped('GD webp support is not enabled');
         }
-        if ($format === 'avif' || $format === 'heic' || $format === 'jxl') {
+        if ($format === 'avif' && !function_exists('imageavif')) {
+            $this->markTestSkipped('GD avif support is not enabled');
+        }
+        if ($format === 'heic' || $format === 'jxl') {
             $this->markTestSkipped('GD does not support ' . strtoupper($format));
         }
 

tests/tests/Gd/ImagineTest.php

@@ -48,15 +48,17 @@ public function testShouldOpenAWebPImage()
     }
 
     /**
-     * @group always-skipped
-     *
      * {@inheritdoc}
      *
      * @see \Imagine\Test\Image\AbstractImagineTest::testShouldOpenAAvifImage()
      */
     public function testShouldOpenAAvifImage()
     {
-        $this->markTestSkipped('GD does not support AVIF');
+        if (!function_exists('imageavif')) {
+            $this->markTestSkipped('GD imageavif support is not enabled');
+        }
+
+        return parent::testShouldOpenAAvifImage();
     }
 
     /**