Add CropModifier

src/Drivers/Abstract/AbstractImage.php

@@ -345,6 +345,18 @@ abstract class AbstractImage implements ImageInterface
         );
     }
 
+    public function crop(
+        int $width,
+        int $height,
+        string $position = 'center',
+        int $offset_x = 0,
+        int $offset_y = 0
+    ): ImageInterface {
+        return $this->modify(
+            $this->resolveDriverClass('Modifiers\CropModifier', $width, $height, $position, $offset_x, $offset_y)
+        );
+    }
+
     public function removeAnimation(int $position = 0): ImageInterface
     {
         return $this->modify(

src/Drivers/Gd/Modifiers/CropModifier.php

@@ -0,0 +1,94 @@
+<?php
+
+namespace Intervention\Image\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Geometry\Rectangle;
+use Intervention\Image\Interfaces\FrameInterface;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+use Intervention\Image\Interfaces\SizeInterface;
+
+class CropModifier implements ModifierInterface
+{
+    public function __construct(
+        protected int $width,
+        protected int $height,
+        protected string $position = 'center',
+        protected int $offset_x = 0,
+        protected int $offset_y = 0
+    ) {
+        //
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        $crop = new Rectangle($this->width, $this->height);
+        $crop->align($this->position);
+        $crop->alignPivotTo($image->getSize(), $this->position);
+
+        foreach ($image as $frame) {
+            $this->cropFrame($frame, $crop);
+        }
+
+        return $image;
+    }
+
+    protected function cropFrame(FrameInterface $frame, SizeInterface $resizeTo): void
+    {
+        // create new image
+        $modified = imagecreatetruecolor(
+            $resizeTo->getWidth(),
+            $resizeTo->getHeight()
+        );
+
+        // get current image
+        $current = $frame->getCore();
+
+        // preserve transparency
+        imagealphablending($modified, false);
+        $transIndex = imagecolortransparent($current);
+
+        if ($transIndex != -1) {
+            $rgba = imagecolorsforindex($modified, $transIndex);
+            $transColor = imagecolorallocatealpha($modified, $rgba['red'], $rgba['green'], $rgba['blue'], 127);
+            imagefill($modified, 0, 0, $transColor);
+        } else {
+            imagesavealpha($modified, true);
+        }
+
+        // copy content from resource
+        imagecopyresampled(
+            $modified,
+            $current,
+            0,
+            0,
+            $resizeTo->getPivot()->getX(),
+            $resizeTo->getPivot()->getY(),
+            $resizeTo->getWidth(),
+            $resizeTo->getHeight(),
+            $resizeTo->getWidth(),
+            $resizeTo->getHeight(),
+        );
+
+        imagedestroy($current);
+
+        if ($transIndex != -1) { // @todo refactor because of duplication
+            imagecolortransparent($modified, $transIndex);
+            for ($y = 0; $y < $resizeTo->getHeight(); ++$y) {
+                for ($x = 0; $x < $resizeTo->getWidth(); ++$x) {
+                    if (((imagecolorat($modified, $x, $y) >> 24) & 0x7F) >= 100) {
+                        imagesetpixel(
+                            $modified,
+                            $x,
+                            $y,
+                            $transIndex
+                        );
+                    }
+                }
+            }
+        }
+
+        // set new content as recource
+        $frame->setCore($modified);
+    }
+}

src/Drivers/Imagick/Modifiers/CropModifier.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Intervention\Image\Drivers\Imagick\Modifiers;
+
+use Intervention\Image\Geometry\Rectangle;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+
+class CropModifier implements ModifierInterface
+{
+    public function __construct(
+        protected int $width,
+        protected int $height,
+        protected string $position = 'center',
+        protected int $offset_x = 0,
+        protected int $offset_y = 0
+    ) {
+        //
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        $crop = new Rectangle($this->width, $this->height);
+        $crop->align($this->position);
+        $crop->alignPivotTo($image->getSize(), $this->position);
+
+        foreach ($image as $frame) {
+            $frame->getCore()->extentImage(
+                $crop->getWidth(),
+                $crop->getHeight(),
+                $crop->getPivot()->getX() + $this->offset_x,
+                $crop->getPivot()->getY() + $this->offset_y
+            );
+        }
+
+        return $image;
+    }
+}

tests/Drivers/Gd/Modifiers/CropModifierTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Drivers\Gd\Modifiers\CropModifier;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateGdTestImage;
+
+/**
+ * @requires extension gd
+ * @covers \Intervention\Image\Drivers\Gd\Modifiers\CropModifier
+ */
+class CropModifierTest extends TestCase
+{
+    use CanCreateGdTestImage;
+
+    public function testModify(): void
+    {
+        $image = $this->createTestImage('blocks.png');
+        $image = $image->modify(new CropModifier(200, 200, 'bottom-right'));
+        $image->toPng()->save('./test.png');
+        $this->assertEquals(200, $image->getWidth());
+        $this->assertEquals(200, $image->getHeight());
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(5, 5));
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(100, 100));
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(190, 190));
+    }
+}

tests/Drivers/Imagick/Modifiers/CropModifierTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Imagick\Modifiers;
+
+use Intervention\Image\Drivers\Imagick\Modifiers\CropModifier;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateImagickTestImage;
+
+/**
+ * @requires extension gd
+ * @covers \Intervention\Image\Drivers\Imagick\Modifiers\CropModifier
+ */
+class CropModifierTest extends TestCase
+{
+    use CanCreateImagickTestImage;
+
+    public function testModify(): void
+    {
+        $image = $this->createTestImage('blocks.png');
+        $image = $image->modify(new CropModifier(200, 200, 'bottom-right'));
+        $image->toPng()->save('./test.png');
+        $this->assertEquals(200, $image->getWidth());
+        $this->assertEquals(200, $image->getHeight());
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(5, 5));
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(100, 100));
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(190, 190));
+    }
+}