Reintroduce ::assertImageEquals()

cmb69 · Mar 22, 2023 · a31eff9 · a31eff9
1 parent 21ada95
commit a31eff9
Showing 1 changed file with 68 additions and 3 deletions.
diff --git a/tests/VisualCaptchaTest.php b/tests/VisualCaptchaTest.php
@@ -71,9 +71,7 @@ public function testCreateImage()
     {
         $sut = new FakeVisualCaptcha(vfsStream::url('test/images/'), '../cryptographp/fonts', self::CONFIG);
         $actual = $sut->createImage('ABCD');
-        ob_start();
-        imagegif($actual);
-        Approvals::verifyStringWithFileExtension(ob_get_clean(), "gif");
+        $this->assertImageEquals('image', $actual);
     }
 
     public function testCreateErrorImage()
@@ -203,4 +201,71 @@ public function testWordwrapInErrorImage()
         imagegif($actual);
         Approvals::verifyStringWithFileExtension(ob_get_clean(), "gif");
     }
+
+    /**
+     * @param string $expected
+     * @param resource $actual
+     * @return void
+     */
+    private function assertImageEquals($expected, $actual)
+    {
+        $im1 = imagecreatefrompng(__DIR__ . "/images/$expected.png");
+        $im2 = $actual;
+
+        $w1 = imagesx($im1);
+        $h1 = imagesy($im1);
+
+        $w2 = imagesx($im2);
+        $h2 = imagesy($im2);
+
+        if ($w1 !== $w2 || $h1 !== $h2) {
+            $this->assertTrue(false);
+        }
+
+        $im3 = imagecreatetruecolor($w1, $h1);
+        imagealphablending($im3, false);
+
+        $difference = 0.0;
+        for ($i = 0; $i < $w1; $i++) {
+            for ($j = 0; $j < $h1; $j++) {
+                $c1 = imagecolorat($im1, $i, $j);
+                $c2 = imagecolorat($im2, $i, $j);
+
+                $a1 = ($c1 >> 24) & 0x7f;
+                $r1 = ($c1 >> 16) & 0xff;
+                $g1 = ($c1 >>  8) & 0xff;
+                $b1 = ($c1 >>  0) & 0xff;
+
+                $a2 = ($c2 >> 24) & 0x7f;
+                $r2 = ($c2 >> 16) & 0xff;
+                $g2 = ($c2 >>  8) & 0xff;
+                $b2 = ($c2 >>  0) & 0xff;
+
+                if ($a1 !== 0 || $a2 !== 0) {
+                    $this->assertTrue(false);
+                }
+
+                $d = sqrt(($r1 - $r2)**2 + ($g1 - $g2)**2 + ($b1 - $b2)**2) / sqrt(3 * 255**2);
+                $difference += $d;
+
+                $a3 = 127 - (int) (127 * $d);
+                $r3 = (int) (sqrt($r1**2 + $r2**2) / sqrt(2 * 255**2) * 255);
+                $g3 = (int) (sqrt($g1**2 + $g2**2) / sqrt(2 * 255**2) * 255);
+                $b3 = (int) (sqrt($b1**2 + $b2**2) / sqrt(2 * 255**2) * 255);
+
+                $c3 = ($a3 << 24) | ($r3 << 16) | ($g3 << 8) | $b3;
+
+                imagesetpixel($im3, $i, $j, $c3);
+            }
+        }
+
+        if ($difference > 0.0) {
+            imagesavealpha($im2, true);
+            imagepng($im2, __DIR__ . "/images/$expected.out.png");
+            imagesavealpha($im3, true);
+            imagepng($im3, __DIR__ . "/images/$expected.diff.png");
+        }
+
+        return $this->assertEqualsWithDelta(0.0, $difference, 0.1);
+    }
 }