From e01840cc02873dafebe8175c4254b6a509433a48 Mon Sep 17 00:00:00 2001
From: Jay MOULIN <jaymoulin@gmail.com>
Date: Sat, 24 Jun 2017 17:25:19 +0200
Subject: [PATCH] [#2] Fixes black pixels on alpha layer for PNG

---
 src/ResizeEngine.php       |  8 +++-----
 tests/ResizeEngineTest.php | 15 ---------------
 2 files changed, 3 insertions(+), 20 deletions(-)

diff --git a/src/ResizeEngine.php b/src/ResizeEngine.php
index 6df0f05..e0dde84 100644
--- a/src/ResizeEngine.php
+++ b/src/ResizeEngine.php
@@ -147,9 +147,9 @@ protected function prepareImageResized($width, $height, $type, $image)
         $imageResized = $libGd->imagecreatetruecolor($width, $height);
         if (($type == IMAGETYPE_GIF) || ($type == IMAGETYPE_PNG)) {
             $transparency = $libGd->imagecolortransparent($image);
-            $palletsize = $libGd->imagecolorstotal($image);
+            $palletSize = $libGd->imagecolorstotal($image);
 
-            if ($transparency >= 0 && $transparency < $palletsize) {
+            if ($type !== IMAGETYPE_PNG && $transparency >= 0 && $transparency < $palletSize) {
                 $transparentColor = $libGd->imagecolorsforindex($image, $transparency);
                 $transparency = $libGd->imagecolorallocate(
                     $imageResized,
@@ -159,10 +159,8 @@ protected function prepareImageResized($width, $height, $type, $image)
                 );
                 $libGd->imagefill($imageResized, 0, 0, $transparency);
                 $libGd->imagecolortransparent($imageResized, $transparency);
-            } elseif ($type == IMAGETYPE_PNG) {
+            } elseif ($type === IMAGETYPE_PNG) {
                 $libGd->imagealphablending($imageResized, false);
-                $color = $libGd->imagecolorallocatealpha($imageResized, 0, 0, 0, 127);
-                $libGd->imagefill($imageResized, 0, 0, $color);
                 $libGd->imagesavealpha($imageResized, true);
             }
         }
diff --git a/tests/ResizeEngineTest.php b/tests/ResizeEngineTest.php
index 78f1e5c..b6ae879 100644
--- a/tests/ResizeEngineTest.php
+++ b/tests/ResizeEngineTest.php
@@ -509,8 +509,6 @@ public function testPrepareImageResizedPng()
                     'imagecolorstotal',
                     'imagecolorsforindex',
                     'imagealphablending',
-                    'imagecolorallocatealpha',
-                    'imagefill',
                     'imagesavealpha',
                 )
             )
@@ -529,19 +527,6 @@ public function testPrepareImageResizedPng()
         $mockGd->expects($this->once())
             ->method('imagealphablending')
             ->with($this->equalTo($resource2), $this->equalTo(false));
-        $mockGd->expects($this->once())
-            ->method('imagecolorallocatealpha')
-            ->with(
-                $this->equalTo($resource2),
-                $this->equalTo(0),
-                $this->equalTo(0),
-                $this->equalTo(0),
-                $this->equalTo(127)
-            )
-            ->willReturn(5000);
-        $mockGd->expects($this->once())
-            ->method('imagefill')
-            ->with($this->equalTo($resource2), $this->equalTo(0), $this->equalTo(0), $this->equalTo(5000));
         $mockGd->expects($this->once())
             ->method('imagesavealpha')
             ->with($this->equalTo($resource2), $this->equalTo(true));