Add percent values as input for ImageInterface::removeAnimation()

src/Drivers/Abstract/AbstractImage.php

@@ -374,7 +374,7 @@ public function crop(
         );
     }
 
-    public function removeAnimation(int $position = 0): ImageInterface
+    public function removeAnimation(int|string $position = 0): ImageInterface
     {
         return $this->modify(
             $this->resolveDriverClass('Modifiers\RemoveAnimationModifier', $position)

src/Drivers/Abstract/Modifiers/AbstractRemoveAnimationModifier.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Intervention\Image\Drivers\Abstract\Modifiers;
+
+use Intervention\Image\Exceptions\InputException;
+use Intervention\Image\Interfaces\FrameInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+
+abstract class AbstractRemoveAnimationModifier implements ModifierInterface
+{
+    protected function chosenFrame($image, int|string $position): FrameInterface
+    {
+        if (is_int($position)) {
+            return $image->frame($position);
+        }
+
+        if (preg_match("/^(?P<percent>[0-9]{1,3})%$/", $position, $matches) != 1) {
+            throw new InputException(
+                'Input value of Image::removeAnimation() must be either integer or a percent value as string.'
+            );
+        }
+
+        $total = count($image);
+        $position = intval(round($total / 100 * intval($matches['percent'])));
+        $position = $position == $total ? $position - 1 : $position;
+
+        return $image->frame($position);
+    }
+}

src/Drivers/Gd/Modifiers/RemoveAnimationModifier.php

@@ -3,36 +3,25 @@
 namespace Intervention\Image\Drivers\Gd\Modifiers;
 
 use Intervention\Image\Collection;
-use Intervention\Image\Drivers\Gd\Image;
-use Intervention\Image\Exceptions\RuntimeException;
+use Intervention\Image\Drivers\Abstract\Modifiers\AbstractRemoveAnimationModifier;
 use Intervention\Image\Interfaces\ImageInterface;
-use Intervention\Image\Interfaces\ModifierInterface;
 use Intervention\Image\Traits\CanCheckType;
+use Intervention\Image\Drivers\Gd\Image;
 
-class RemoveAnimationModifier implements ModifierInterface
+class RemoveAnimationModifier extends AbstractRemoveAnimationModifier
 {
     use CanCheckType;
 
-    public function __construct(protected int $position = 0)
+    public function __construct(protected int|string $position = 0)
     {
         //
     }
 
     public function apply(ImageInterface $image): ImageInterface
     {
-        if (!$image->isAnimated()) {
-            throw new RuntimeException('Image is not animated.');
-        }
-
         $image = $this->failIfNotClass($image, Image::class);
-
-        $frames = new Collection();
-        foreach ($image as $key => $frame) {
-            if ($this->position == $key) {
-                $frames->push($frame);
-            }
-        }
-
-        return $image->setFrames($frames);
+        return $image->setFrames(new Collection([
+            $this->chosenFrame($image, $this->position)
+        ]));
     }
 }

src/Drivers/Imagick/Modifiers/RemoveAnimationModifier.php

@@ -3,36 +3,28 @@
 namespace Intervention\Image\Drivers\Imagick\Modifiers;
 
 use Imagick;
-use Intervention\Image\Exceptions\RuntimeException;
+use Intervention\Image\Drivers\Abstract\Modifiers\AbstractRemoveAnimationModifier;
 use Intervention\Image\Interfaces\ImageInterface;
-use Intervention\Image\Interfaces\ModifierInterface;
 use Intervention\Image\Drivers\Imagick\Image;
 use Intervention\Image\Traits\CanCheckType;
 
-class RemoveAnimationModifier implements ModifierInterface
+class RemoveAnimationModifier extends AbstractRemoveAnimationModifier
 {
     use CanCheckType;
 
-    public function __construct(protected int $position = 0)
+    public function __construct(protected int|string $position = 0)
     {
         //
     }
 
     public function apply(ImageInterface $image): ImageInterface
     {
-        if (!$image->isAnimated()) {
-            throw new RuntimeException('Image is not animated.');
-        }
-
         $image = $this->failIfNotClass($image, Image::class);
 
         // create new imagick with just one image
         $imagick = new Imagick();
-        foreach ($image->getImagick() as $key => $core) {
-            if ($key == $this->position) {
-                $imagick->addImage($core->getImage());
-            }
-        }
+        $frame = $this->chosenFrame($image, $this->position);
+        $imagick->addImage($frame->core()->getImage());
 
         return $image->setImagick($imagick);
     }

src/Exceptions/InputException.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Intervention\Image\Exceptions;
+
+class InputException extends \RuntimeException
+{
+    //
+}

src/Interfaces/ImageInterface.php

@@ -79,10 +79,10 @@ public function isAnimated(): bool;
     /**
      * Remove all frames but keep the one at the specified position
      *
-     * @param  int $position
+     * @param  int|string $position
      * @return ImageInterface
      */
-    public function removeAnimation(int $position = 0): ImageInterface;
+    public function removeAnimation(int|string $position = 0): ImageInterface;
 
     /**
      * Apply given modifier to current image

tests/Drivers/Gd/Modifiers/RemoveAnimationModifierTest.php

@@ -22,4 +22,13 @@ public function testApply(): void
         $this->assertEquals(1, count($image));
         $this->assertEquals(1, count($result));
     }
+
+    public function testApplyPercent(): void
+    {
+        $image = $this->createTestImage('animation.gif');
+        $this->assertEquals(8, count($image));
+        $result = $image->modify(new RemoveAnimationModifier('20%'));
+        $this->assertEquals(1, count($image));
+        $this->assertEquals(1, count($result));
+    }
 }

tests/Drivers/Imagick/Modifiers/RemoveAnimationModifierTest.php

@@ -22,4 +22,13 @@ public function testApply(): void
         $this->assertEquals(1, count($image));
         $this->assertEquals(1, count($result));
     }
+
+    public function testApplyPercent(): void
+    {
+        $image = $this->createTestImage('animation.gif');
+        $this->assertEquals(8, count($image));
+        $result = $image->modify(new RemoveAnimationModifier('20%'));
+        $this->assertEquals(1, count($image));
+        $this->assertEquals(1, count($result));
+    }
 }