[cairo-bugs] [Bug 99054] New: cairo snapshot 1.15.[2, 4], win32 backend: assertion (surface->is_clear) failed

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Dec 11 12:06:31 UTC 2016


            Bug ID: 99054
           Summary: cairo snapshot 1.15.[2,4], win32 backend: assertion
                    (surface->is_clear) failed
           Product: cairo
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: win32 backend
          Assignee: cairo-bugs at cairographics.org
          Reporter: wippbox at gmx.net
        QA Contact: cairo-bugs at cairographics.org

Created attachment 128411
  --> https://bugs.freedesktop.org/attachment.cgi?id=128411&action=edit

I cross-compiled cairo-1.15.2 and cairo-1.15.4 for windows.
When running a test program, I get the following:

>   Assertion failed!
>   File: src/cairo-surface.c, Line 545
>   Expression: surface->is_clear
>   abnormal program termination

This happens in cairo_surface_create_similar.
Adding a line
> new_surf->is_clear = TRUE;
at the end of _cairo_win32_display_surface_create_similar in
fixes the issue (see patch).

Remark: The particular case occured only for width = 0 in
cairo_surface_create_similar. For width > 0 the issue did not happen.

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