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-rw-r--r--ext/gd/libgd/gd_gif_out.c2
-rw-r--r--ext/gd/tests/bug77700.phpt24
2 files changed, 25 insertions, 1 deletions
diff --git a/ext/gd/libgd/gd_gif_out.c b/ext/gd/libgd/gd_gif_out.c
index 2e1f38af70..60f34ddc27 100644
--- a/ext/gd/libgd/gd_gif_out.c
+++ b/ext/gd/libgd/gd_gif_out.c
@@ -144,7 +144,7 @@ static int _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. */
diff --git a/ext/gd/tests/bug77700.phpt b/ext/gd/tests/bug77700.phpt
new file mode 100644
index 0000000000..07b7ffbbba
--- /dev/null
+++ b/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');
+?>