Fix #319: gdImageRotateInterpolated can have wrong background color

We backport the fix for <https://bugs.php.net/65070>, and also the fix for
<https://bugs.php.net/70976> which was introduced by fixing 65070.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/gd.c b/src/gd.c
index 0f80faa..e3edf43 100644
--- a/src/gd.c
+++ b/src/gd.c
@@ -4385,6 +4385,12 @@ BGD_DECLARE(int) gdImagePaletteToTrueColor(gdImagePtr src)
 	src->pixels = NULL;
 	src->alphaBlendingFlag = 0;
 	src->saveAlphaFlag = 1;
+
+	if (src->transparent >= 0) {
+		const unsigned char c = src->transparent;
+		src->transparent =  gdTrueColorAlpha(src->red[c], src->green[c], src->blue[c], src->alpha[c]);
+	}
+
 	return 1;
 
 clean_on_error: