From: Ilia Alshanetsky <iliaa@php.net>
Date: Sun, 12 Apr 2009 14:45:05 +0000 (+0000)
Subject: MFB: Fixed bug #47946 (ImageConvolution overwrites background)
X-Git-Tag: php-5.4.0alpha1~191^2~3930
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0bb885a441b19a7b2534c05ecb33481bbd301488;p=php

MFB: Fixed bug #47946 (ImageConvolution overwrites background)
---

diff --git a/ext/gd/libgd/gd.c b/ext/gd/libgd/gd.c
index 70f4e31c78..7bc25e710f 100644
--- a/ext/gd/libgd/gd.c
+++ b/ext/gd/libgd/gd.c
@@ -3863,7 +3863,7 @@ int gdImageConvolution(gdImagePtr src, float filter[3][3], float filter_div, flo
 	int         x, y, i, j, new_a;
 	float       new_r, new_g, new_b;
 	int         new_pxl, pxl=0;
-	gdImagePtr  srcback;
+	gdImagePtr  srcback, srctrans;
 	typedef int (*FuncPtr)(gdImagePtr, int, int);
 	FuncPtr f;
 
@@ -3873,6 +3873,10 @@ int gdImageConvolution(gdImagePtr src, float filter[3][3], float filter_div, flo
 
 	/* We need the orinal image with each safe neoghb. pixel */
 	srcback = gdImageCreateTrueColor (src->sx, src->sy);
+	srcback->saveAlphaFlag = 1;
+	srctrans = gdImageColorAllocateAlpha(srcback, 0, 0, 0, 127);
+	gdImageFill(srcback, 0, 0, srctrans);
+
 	gdImageCopy(srcback, src,0,0,0,0,src->sx,src->sy);
 
 	if (srcback==NULL) {