<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - raster source pattern callback weirdness" href="https://bugs.freedesktop.org/show_bug.cgi?id=101866#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - raster source pattern callback weirdness" href="https://bugs.freedesktop.org/show_bug.cgi?id=101866">bug 101866</a> from <a class="email" href="mailto:reiter.christoph@gmail.com" title="Christoph Reiter <reiter.christoph@gmail.com>"> Christoph Reiter</a> <pre>(In reply to Uli Schlachter from <a href="show_bug.cgi?id=101866#c1">comment #1</a>) > Use cairo_raster_source_pattern_set_callback_data() to set the closure > argument of your callback: > <a href="https://www.cairographics.org/manual/cairo-Raster-Sources.html#cairo-raster">https://www.cairographics.org/manual/cairo-Raster-Sources.html#cairo-raster</a>- > source-pattern-set-callback-data Thanks. I'm using that now. I'd would have preferred to use cairo_pattern_get/set_user_data() so there can be no conflict if Python gets passed an existing object with configured callbacks/callback data from C. But I guess that's unlikely to happen anyway. > The pattern argument is a static, stack-allocated copy that cairo creates > internally. I have to admit that I am not sure why this pattern is given to > the callback at all. The backtrace for the creation of the copy looks like > that (I guess that both calls create copies of the raster pattern): If there is no use for it I'll just not pass it to the Python callback then, thanks. > For this bug report: I would argue that your expected behavior just is not > the behavior that cairo provides, so there is no bug here. I'm not sure what > you mean exactly with "it is dead, so doing anything with it crashes". Your > example program does not crash here. I meant that the object has a reference count of 0 and wrapping it, which involved refing/unrefing it, made it crash if I remember correctly. The example program should not crash but show a reference count of 0. Closing is fine with me, thanks.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>