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The test works fine, eventual issues have been fixed on master
reviously.
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This updates the function prototype to similar changes in pixman.
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The function is necessary for all users that need to support arbitrary
pixman formats, where the cairo_format_t enum is not enough.
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The test isn't useful on vector backends and fails there due to
antialiasing issues.
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When the reference point was tirggering _line_exceeds_16_16() and got
adjusted, the code failed to compute the srcX and srcY arguments for the
call to XRenderCompositeTrapezoids() correctly and caused the resulting
source image to be misaligned.
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This test fills a slightly rotated surface slightly above the 0 line.
This hits some corner cases in the XRenderComposite path.
I discovered these issues while playing with video rendering onto the
canvas in HTML5 (both Webkit and Mozilla have this problem).
I used CAIRO_ANTIALIAS_NONE and a single-color source in the test to get
rid of aliasing issues in the output images. This makes some issues
slightly less visible, but still fails for all of them. If you want to
get a clearer view, disable it and use romedalen.png instead - it has
the same size as the red surface.
(At least) 3 bugs are at work here:
- if _line_exceeds_16_16() triggers for the reference point, the
source surface will be misaligned.
- the intel driver seems to have an off-by-one bug on my i945 when
positioning the source surface, causing black seams at the top
(not visible in the test unless using romedalen.png) and on the left
of the image.
- My Xvfb fails completely in picture up/download in the xlib-fallback
path.
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Try again, this time for real hopefully.
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Switching to pthread-stubs broke the build for sphinx on unbroken
platforms [those that do not unnecessarily link against -lpthreads].
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By filling the background with grey, we can see that Xlib fills areas
with black that it shouldn't. Xlib therefore now fails this test.
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Only the very first line-to following a move-to can have any
significance if degenerate whilst stroking, so skip all others.
In other words,
0 0 m 0 0 l stroke
produces a capped degenerate path (i.e a dot),
0 0 m 0 0 l 0 0 l stroke
produces the same degenerate stroke, and
0 0 m 0 0 l 1 0 l stroke
produce a horizontal line.
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Malte Nuhn reported hitting an assertion:
cairo-path-stroke.c:1816: _cairo_rectilinear_stroker_line_to: Assertion `a->x == b->x || a->y == b->y' failed.
http://bugs.freedesktop.org/show_bug.cgi?id=24797
when stroking an apparently simple path:
0 8.626485 m
0 8.626485 l
5.208333 2.5 l
10.416667 2.5 l
15.625 2.5 l
20.833333 2.5 l
26.041667 2.5 l
31.25 2.5 l
36.458333 2.5 l
41.666667 2.5 l
46.875 2.5 l
52.083333 2.5 l
57.291667 2.5 l
62.5 2.5 l
67.708333 2.5 l
72.916667 2.5 l
78.125 2.5 l
83.333333 2.5 l
88.541667 2.5 l
93.75 2.5 l
98.958333 2.5 l
104.166667 2.5 l
109.375 2.5 l
114.583333 2.5 l
119.791667 2.5 l
125 2.5 l
stroke
which upon reduction becomes:
0.000000 8.625000 m 5.207031 2.500000 l 125.000000 2.500000 l stroke
The bug is that after spotting a repeated line-to we move the previous
end-point without reclassifying the path, hence we miss the
non-rectilinear step.
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The glibc versions are slow in utf8 locales.
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Whilst creating the xlib surface wrapper for gradient Pictures, the
corresponding attributes require ComponentAlpha disabled.
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Bug 24730 -- New: misleading use cases in cairo_scaled_font_text_to_glyphs's docs
http://bugs.freedesktop.org/show_bug.cgi?id=24730
An apparent copy'n'paste error from the code which has to deal with
indirect pointers crept into the documentation for the same functions.
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The sort order was unstable resulting in incorrect ordering dependent
upon libc version.
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Peter Clifton spotted that we failed to properly wrap
_cairo_int64_32_div() for systems without a native 64 bit type.
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If the pattern is for example a repeating 0x0 image, then treat it as
having zero extents.
This should workaround the bug presented here:
https://bugs.freedesktop.org/show_bug.cgi?id=24693
Attached PDF crashes evince with a Floating point exception
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The new name is more descriptive than the rather opaque meta surface.
Discussed with vigour on the mailing list and #cairo:
http://lists.cairographics.org/archives/cairo/2009-July/017571.html
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Within our code base we carried a few hacks to utilize the component
alpha capabilities of pixman, whilst not supporting the concept for our
own masks. Thus we were setting it upon the pixman_image_t that we
passed around through code that was blissfully unaware and indeed the
component-alpha property was forgotten (e.g. upgrading glyph masks).
The real issue is that without explicit support that a pattern carries
subpixel masking information, that information is lost when using that
pattern with composite. Again we can look at the example of compositing
a sub-pixel glyph mask onto a remote xlib surface for further failure.
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Create a scratch surface that will be initialised as required for
internal use. External surfaces, i.e. those returned to the user, are
cleared as normal.
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A nasty surprise whilst profiling is that performing redundant clear
operations is extremely painful. We can mitigate this somewhat by
tracking the cleared state of surfaces and skipping repeated attempts to
clear a surface.
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Or perhaps, more importantly, when the contents are left unmodified.
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Test the results of compositing ALPHA and COLOR_ALPHA surfaces
with different operators.
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Update this test case so the background is not the default border colour
so that we spot when the backend pads out the transformed image surface.
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AO_compare_and_swap_full() doesn't have the same semantic as
_cairo_atomic_int_cmpxchg(). The former returns a TRUE on success
FALSE otherwise while the later returns the atomic value.
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Previously target device offsets were applied in cairo-surface.c which
could cause bugs when paths were taken as fallbacks, as for example
pointed out by ade55037ffa596b690c6a1051394589f76eb1f48 and quick-fixed
by 79190d89853958ee8252440d35a662fabf122afd. The quick-fix is now
unnecessary and was removed.
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ranma42 found a bug in compositing with a radial gradient using the
SOURCE operator with EXTEND_NONE, as exercised here.
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Gah, that was a horrible mistake. It was a flawed hack to create Pixmaps
of the correct depth when cloning patterns for blitting to the xlib
backend. However, it had the nasty side-effect of discarding alpha when
targeting Window surfaces. The correct solution is to simply correct the
Pixmap of the desired depth and render a matching pattern onto the
surface - i.e. a reversal the current acquire -> clone. See the
forthcoming revised xcb backend on how I should have done it originally.
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Honour the incoming surface format when we are asked to create a similar
surface with identical content. The goal of
cairo_surface_create_similar() is to create an intermediate with similar
characteristics to the original that can be used in place of the
original and be quick to copy to the original. Matching the format for
the same content, ensures that the blits between the two need only be a
memcpy.
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The goal is to create a similar surface with an identical format to
maximise performance in the subsequent blit, e.g. the xlib backend could
make the similar surface with an identical depth and so use the core
protocol, or the image surface could indeed make an identical copy so
that pixman only has to do a fast memcpy. As there is no direct method
to specify such a clone, we ask the backend for a similar surface of
identical content, and trust that the semantics are clear enough for the
intent to obvious.
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Just after the 1.9.4 snapshot.
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Again, the kind of thing that only gets fixed at release time.
But at least we have a nice test for this.
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Otherwise, it was disrupting my attempts to release a snapshot, (since
it doesn't respect CAIRO_TEST_TARGET=" " and not run like most of the
tests do).
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In preparation for the 1.9.4 snapshot.
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This is just one of those things that we don't get right until
someone tries running "make distcheck".
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Turns out we were passing suncc warning suppression flags to gcc
by mistake since -e<entry point> is actually a valid option for
gcc. This caused the -erroff=E_ENUM_TYPE_MISMATCH_ARG and other
-erroff options to be passed to the linker. In the normal case
of a GNU ld linker this doesn't matter since it ignores bogus
entry points, but the GNU gold linker replaces a bogus entry
point with NULL. This patch makes the CAIRO_CC_TRY_FLAG()
check stricter by testing that the flag doesn't interfere with
linking executables.
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_cairo_surface_fallback_paint() attempts to avoid a clipped operation if
we can convert the paint into a fill of the clipmask. However by calling
_cairo_surface_fill() we incur a double application of device offset to
the source, triggering various failures.
Company spotted this and managed to extract an excellent minimal test
case, test/clip-device-offset. This commit fixes that failure.
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Exercises a bug demonstrated by WebKit with clipping + device offsets.
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Avoid pulling in the real pthread library if the application is single
threaded and not using pthreads, by linking against pthread-stubs
instead.
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Use libatomic-ops-dev in preference to mutex-based atomics, if we do not
have the builtin atomic intrinsics available.
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As noted in the comments we could also compute the pattern extents for
gradients with CAIRO_EXTEND_NONE under certain circumstances, i.e.
radial gradients and device axis aligned linear gradients.
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Bug 24240 acroread prints error message when printing
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