From: Ilia Alshanetsky <iliaa@php.net>
Date: Sun, 12 Apr 2009 14:43:21 +0000 (+0000)
Subject: Fixed bug #47946 (ImageConvolution overwrites background)
X-Git-Tag: php-5.3.0RC2~173
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c593790b62f165f976d57cce6b3bb45b1b07c09b;p=php

Fixed bug #47946 (ImageConvolution overwrites background)
# original patch by  jcolby at acsol dot net
---

diff --git a/ext/gd/libgd/gd.c b/ext/gd/libgd/gd.c
index 7760fecf20..8971dcc3b8 100644
--- a/ext/gd/libgd/gd.c
+++ b/ext/gd/libgd/gd.c
@@ -3870,7 +3870,7 @@ 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;
 
@@ -3880,6 +3880,10 @@ 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) {