From 0da7022eb6ed7c0939756d670b958173265b70d9 Mon Sep 17 00:00:00 2001
From: Niels Dossche <7771979+nielsdos@users.noreply.github.com>
Date: Thu, 25 Jan 2024 23:30:23 +0100
Subject: [PATCH] Fix GH-10614: imagerotate will turn the picture all black,
 when rotated 90

This is a backport of the upstream libgd PR that was recently committed
[1].

[1] https://github.com/libgd/libgd/pull/862
---
 ext/gd/libgd/gd_rotate.c  |   6 +--
 ext/gd/tests/gh10614.phpt |  93 ++++++++++++++++++++++++++++++++++++++
 ext/gd/tests/gh10614.png  | Bin 0 -> 98 bytes
 3 files changed, 96 insertions(+), 3 deletions(-)
 create mode 100644 ext/gd/tests/gh10614.phpt
 create mode 100644 ext/gd/tests/gh10614.png

diff --git a/ext/gd/libgd/gd_rotate.c b/ext/gd/libgd/gd_rotate.c
index cc89652f03f79..53c6c9470db79 100644
--- a/ext/gd/libgd/gd_rotate.c
+++ b/ext/gd/libgd/gd_rotate.c
@@ -216,7 +216,7 @@ gdImagePtr gdImageRotate90 (gdImagePtr src, int ignoretransparent)
 	if (dst != NULL) {
 		int old_blendmode = dst->alphaBlendingFlag;
 		dst->alphaBlendingFlag = 0;
-
+		dst->saveAlphaFlag = 1;
 		dst->transparent = src->transparent;
 
 		gdImagePaletteCopy (dst, src);
@@ -263,7 +263,7 @@ gdImagePtr gdImageRotate180 (gdImagePtr src, int ignoretransparent)
 	if (dst != NULL) {
 		int old_blendmode = dst->alphaBlendingFlag;
 		dst->alphaBlendingFlag = 0;
-
+		dst->saveAlphaFlag = 1;
 		dst->transparent = src->transparent;
 
 		gdImagePaletteCopy (dst, src);
@@ -311,7 +311,7 @@ gdImagePtr gdImageRotate270 (gdImagePtr src, int ignoretransparent)
 	if (dst != NULL) {
 		int old_blendmode = dst->alphaBlendingFlag;
 		dst->alphaBlendingFlag = 0;
-
+		dst->saveAlphaFlag = 1;
 		dst->transparent = src->transparent;
 
 		gdImagePaletteCopy (dst, src);
diff --git a/ext/gd/tests/gh10614.phpt b/ext/gd/tests/gh10614.phpt
new file mode 100644
index 0000000000000..c0689141837cd
--- /dev/null
+++ b/ext/gd/tests/gh10614.phpt
@@ -0,0 +1,93 @@
+--TEST--
+GH-10614 (imagerotate will turn the picture all black, when rotated 90)
+--EXTENSIONS--
+gd
+--SKIPIF--
+<?php
+if (!GD_BUNDLED && version_compare(GD_VERSION, '2.3.4', '>=')) die("skip test requires GD 2.3.4 or older");
+?>
+--FILE--
+<?php
+
+$input = imagecreatefrompng(__DIR__ . '/gh10614.png');
+
+for ($angle = 0; $angle <= 270; $angle += 90) {
+    echo "--- Angle $angle ---\n";
+    $output = imagerotate($input, $angle, 0);
+    for ($i = 0; $i < 4; $i++) {
+        for ($j = 0; $j < 4; $j++) {
+            var_dump(dechex(imagecolorat($output, $i, $j)));
+        }
+    }
+}
+
+?>
+--EXPECT--
+--- Angle 0 ---
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+--- Angle 90 ---
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+--- Angle 180 ---
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+string(1) "0"
+--- Angle 270 ---
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
+string(1) "0"
+string(1) "0"
+string(8) "7f000000"
+string(8) "7f000000"
diff --git a/ext/gd/tests/gh10614.png b/ext/gd/tests/gh10614.png
new file mode 100644
index 0000000000000000000000000000000000000000..baf1ea92fc9ce3dcf9c432876ec32f4de97d8dc4
GIT binary patch
literal 98
zcmeAS@N?(olHy`uVBq!ia0vp^EFjFm1|(O0oL2|p6gzo_Z~#FKM@k2fFX`#x7{W0#
oIUyn82metX5b)v2XxPBOP&0*z_4C4BZ=fOuPgg&ebxsLQ0Hm}QTmS$7

literal 0
HcmV?d00001