Date: Wed, 8 Oct 2008 01:04:45 -0700 (PDT) From: "Dorr H. Clark" <dclark@engr.scu.edu> To: bug-followup@FreeBSD.org Cc: freebsd-x11@FreeBSD.org, freebsd-bugs@FreeBSD.org, "Mikhail T." <mi@aldan.algebra.com> Subject: Re: ports/122924: XCreateImage fails in most recent x11/XOrg Message-ID: <Pine.GSO.4.21.0810080057330.7795-100000@nova41.dc.engr.scu.edu>
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Bug Number 122924: XcreateImage fails in most recent x11/XOrg
This is actually not a bug in FreeBSD, in fact during the investigation
of this bug we were able to reproduce it on Linux (although at a higher
level).
To resolve a bug in XOrg file, we need to have the source files for XOrgalong
with the mandatory external dependencies. Code changes have been made in file
ImUtil.c in directory /usr/ports/distfiles/xorg/lib/libX11-1.1.3/src
and at the bottom of this writeup is an explanation of how to retrieve
the software needed for investigating this bug.
The function XCreateImage takes image_bytes_per_line as one of the inputs.
This parameter determines the value for Number of bytes between a pixel
on one line and the pixel with the same X coordinate on the next line.
In case the calling function sets this parameter to 0, XCreateImage
calculates the minimum value for image_bytes_per_line depending upon
the format of image and the required depth.
Thus, if the input value for image_bytes_per_line is zero or less than
the minimum value, it is set equal to the minimum value.
Here is the patch:
--- ImUtil_org.c 2008-08-21 12:46:15.000000000 +0000
+++ ImUtil.c 2008-08-21 12:47:37.000000000 +0000
@@ -372,10 +372,8 @@
min_bytes_per_line =
ROUNDUP((width + offset), image->bitmap_pad);
}
- if (image_bytes_per_line == 0 ) {
+ if (image_bytes_per_line == 0 ||image_bytes_per_line < min_bytes_per_line ) {
image->bytes_per_line = min_bytes_per_line;
- } else if (image_bytes_per_line < min_bytes_per_line) {
- return 0;
}
else {
image->bytes_per_line = image_bytes_per_line;
Shikha Bansal , engineer
Dorr H. Clark, advisor
Graduate School of Engineering
Santa Clara University,
Santa Clara CA
http://www.cse.scu.edu/~dclark/coen_284_FreeBSD/122924.txt
1) GET THE XORG SOURCES
a) cd /usr/ports/x11/xorg
b) make (you must be connected to internet)
This copies the source files into /usr/ports/distfiles
2) GET THE EXTERNAL DEPENDENCIES
a) go to xcb.freedesktop.org/dist/
b) Download libxcb-0.9.93.tar.gz and xcb-proto-0.9.93.tar.gz in directory /usr/ports/distfiles/xorg/lib
c) cd xcb-proto-0.9.93
d) make
e) cp *.pc /usr/local/libdata/pkgconfig
f) make install
g) similarly install libxcb-0.9.93
3) INSTALL XORG AS A PORT
a) cd /usr/ports/distfiles/xorg/lib/libX11-1.1.3/include
b) mkdir xcb
c) copy the following 4 headers from libxcb-0.9.93 to xcb folder created in previous step:
xcb.h,xproto.h,xcbext.h,xcblib.h
d) make install
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