Merge branch 'PHP-7.2' into PHP-7.3

* PHP-7.2:
  Fix #77700: Writing truecolor images as GIF ignores interlace flag

Author: cmb69

NEWS

@@ -14,6 +14,10 @@ PHP                                                                        NEWS
   . Fixed bug #77677 (FPM fails to build on AIX due to missing WCOREDUMP).
     (Kevin Adler)
 
+- GD:
+  . Fixed bug #77700 (Writing truecolor images as GIF ignores interlace flag).
+    (cmb)
+
 - MySQLi:
   . Fixed bug #77597 (mysqli_fetch_field hangs scripts). (Nikita)
 

ext/gd/libgd/gd_gif_out.c

@@ -132,7 +132,7 @@ void gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
 	BitsPerPixel = colorstobpp(tim->colorsTotal);
 	/* All set, let's do it. */
 	GIFEncode(
-		out, tim->sx, tim->sy, tim->interlace, 0, tim->transparent, BitsPerPixel,
+		out, tim->sx, tim->sy, interlace, 0, tim->transparent, BitsPerPixel,
 		tim->red, tim->green, tim->blue, tim);
 	if (pim) {
 		/* Destroy palette based temporary image. */

ext/gd/tests/bug77700.phpt

@@ -0,0 +1,24 @@
+--TEST--
+Bug #77700 (Writing truecolor images as GIF ignores interlace flag)
+--SKIPIF--
+<?php
+if (!extension_loaded('gd')) die('skip gd extension not available');
+?>
+--FILE--
+<?php
+$im = imagecreatetruecolor(10, 10);
+imagefilledrectangle($im, 0, 0, 9, 9, imagecolorallocate($im, 255, 255, 255));
+imageinterlace($im, 1);
+imagegif($im, __DIR__ . 'bug77700.gif');
+
+$im = imagecreatefromgif(__DIR__ . 'bug77700.gif');
+var_dump(imageinterlace($im));
+?>
+===DONE===
+--EXPECT--
+int(1)
+===DONE===
+--CLEAN--
+<?php
+unlink(__DIR__ . 'bug77700.gif');
+?>