[cairo] Testsuite changes this week
psychon at znc.in
Wed Apr 2 00:41:44 PDT 2014
On 02.04.2014 00:07, Bryce W. Harrington wrote:
> I'm going to try to do ~weekly test runs and post deltas, in hopes this
> helps us spot test regressions more swiftly.
Thanks a lot, that sounds great! (Although weekly might be a little often)
> == Changes since last week (03-17 to 03/29) ==
> 2 PASS -> FAIL
That's the following change which I cannot reproduce with Xephyr:
PASS -> FAIL # filter-nearest-transformed.xcb-window.rgb24
PASS -> FAIL # filter-nearest-transformed.xlib-window.rgb24
> == Changes since last release (v. 1.12 to 03/29) ==
> 2 FAIL -> CRASHED
FAIL -> CRASHED # random-clip.test-mask.argb32
FAIL -> CRASHED # random-clip.test-mask.rgb24
Only happens randomly. Valgrind smells a use-after-free. What happens begins in
cairo-mask-compositor.c, function get_clip_source() (simplified):
surface = _cairo_clip_get_image (clip, dst, bounds);
_cairo_pattern_init_for_surface (&pattern, surface);
surface = compositor->pattern_to_surface (dst, &pattern.base, TRUE,
&r, &r, out_x, out_y);
We have an image surface for which a surface pattern is created. This surface
pattern then owns the only reference to the surface. For this pattern, a new
surface is created (belonging to a different surface backend) and the pattern is
cleaned up and thus the original surface gets finished / destroyed.
Now let's skip into cairo-image-source.c function _pixman_image_for_surface()
(which gets called through _cairo_image_source_create_for_pattern() ->
_pixman_image_for_pattern()). This function notices that we are creating a
pixman image for a cairo image surface and thus skips the copy:
pixman_image = pixman_image_create_bits (source->pixman_format,
(uint32_t *) source->data,
So instead of creating a copy of the data, this function just makes the new
pixman_image_t refer to the same data and it assumes that this image won't live
longer than the original image. As we've seen, this assumption is wrong for this
Figuring out a way to fix this without possibly introducing a reference cycle
loop will be left as an exercise for the interested reader (Chris?). Oh and this
code already uses pixman's image destroy function for other purposes anyway.
> 1 FAIL -> UNTESTED
> 11 PASS -> UNTESTED
> 1 XFAIL -> UNTESTED
These are all on gl-window&. Can't say more than that.
> 3 XFAIL -> FAIL
XFAIL -> FAIL # record90-paint-alpha-clip.script.argb32
XFAIL -> FAIL # record90-paint-alpha-clip-mask.script.argb32
XFAIL -> FAIL # record-paint-alpha-clip-mask.script.argb32
Dunno. Script is too much black magic for me and I cannot find any commit
touching the ref images for record-paint-alpha-clip-mask.
> 703 PASS -> FAIL
Haven't looked into this. I'll just claim that this is due to the new image
scaling together with outdated reference images.
Sent from my Game Boy.
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