Image: fixed lost of alpha after imagecrop() [Closes #202]

nette · Oct 21, 2019 · 8b72022 · 8b72022
1 parent 211b159
commit 8b72022
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diff --git a/src/Utils/Image.php b/src/Utils/Image.php
@@ -366,6 +366,7 @@ public function crop($left, $top, $width, $height)
 		[$r['x'], $r['y'], $r['width'], $r['height']]
 			= static::calculateCutout($this->getWidth(), $this->getHeight(), $left, $top, $width, $height);
 		$this->image = imagecrop($this->image, $r);
+		imagesavealpha($this->image, true);
 		return $this;
 	}
 

diff --git a/tests/Utils/Image.resize.phpt b/tests/Utils/Image.resize.phpt
@@ -140,6 +140,14 @@ test(function () use ($main) { // rotate
 });
 
 
+test(function () use ($main) { // alpha crop
+	$image = Image::fromFile(__DIR__ . '/fixtures.images/alpha1.png');
+	$image->crop(1, 1, 8, 8);
+	Assert::same(file_get_contents(__DIR__ . '/expected/Image.alpha.crop.gd2'), toGd2($image));
+	Assert::same(file_get_contents(__DIR__ . '/expected/Image.alpha.crop.png'), $image->toString($image::PNG));
+});
+
+
 test(function () use ($main) { // alpha resize
 	$image = Image::fromFile(__DIR__ . '/fixtures.images/alpha1.png');
 	$image->resize(20, 20);

diff --git a/tests/Utils/expected/Image.alpha.crop.gd2 b/tests/Utils/expected/Image.alpha.crop.gd2
diff --git a/tests/Utils/expected/Image.alpha.crop.png b/tests/Utils/expected/Image.alpha.crop.png