Bug 5128

Summary:	Issues with font drawing on non-RENDER X server
Product:	cairo	Reporter:	Bogdan Nicula <bogdanni>
Component:	freetype font backend	Assignee:	Owen Taylor <otaylor>
Status:	RESOLVED INVALID	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	normal
Priority:	high
Version:	1.1.1
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Bogdan Nicula 2005-11-23 01:52:53 UTC

Not sure if the component (i.e. ft font backend) is correct.

I'm seeing this with a GTK+ application on X server without RENDER (VNC), cairo
HEAD (something similar happens with 1.0.2):

==30218== Use of uninitialised value of size 4
==30218==    at 0x1B96DC22: fbBltOne (icbltone.c:400)
==30218==    by 0x1B96927A: fbCompositeSolidMask_nx1xn (fbpict.c:953)
==30218==    by 0x1B96A7E4: INT_pixman_composite (fbpict.c:1894)
==30218==    by 0x1B94803E: _cairo_image_surface_composite
(cairo-image-surface.c:599)
==30218==    by 0x1B94F1DE: _cairo_surface_composite (cairo-surface.c:870)
==30218==    by 0x1B94DF6A: _cairo_scaled_font_show_glyphs (cairo-scaled-font.c:890)
==30218==    by 0x1B9507A5: _cairo_surface_old_show_glyphs_draw_func
(cairo-surface.c:1877)
==30218==    by 0x1B945668: _cairo_gstate_clip_and_composite (cairo-gstate.c:1123)
==30218==    by 0x1B9508B1: _cairo_surface_show_glyphs (cairo-surface.c:1927)
==30218==    by 0x1B9469E6: _cairo_gstate_show_glyphs (cairo-gstate.c:1987)
==30218==    by 0x1B9419CB: cairo_show_glyphs (cairo.c:2158)
==30218==    by 0x4355419A: (within /usr/lib/libpangocairo-1.0.so.0.1001.0)
==30218==    by 0x4363AA67: pango_renderer_draw_glyphs (in
/usr/lib/libpango-1.0.so.0.1001.0)
==30218==    by 0x43554733: pango_cairo_show_glyph_string (in
/usr/lib/libpangocairo-1.0.so.0.1001.0)

Comment 1 Chris Wilson 2008-09-30 03:29:26 UTC

Thanks for the report. The complication here is that composite() is such a generic function (it's passed 3 buffer pointers) that identifing the culprit is impossible without at least a minimal test-case (the new valgrind --track-origins=yes tool is a promising, though oft-confusing guide.)

Marking as invalid due to its age and lack of necessary info to reproduce. Though please if you can identify problematic cases, I'll add them to the test suite.

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