Bug 99054

Summary: cairo snapshot 1.15.[2,4], win32 backend: assertion (surface->is_clear) failed
Product: cairo Reporter: Gerhard Bräunlich <wippbox>
Component: win32 backendAssignee: cairo-bugs mailing list <cairo-bugs>
Status: RESOLVED MOVED QA Contact: cairo-bugs mailing list <cairo-bugs>
Severity: critical    
Priority: medium Keywords: patch
Version: unspecified   
Hardware: Other   
OS: All   
i915 platform: i915 features:
Attachments: Fix

Description Gerhard Bräunlich 2016-12-11 12:06:31 UTC
Created attachment 128411 [details] [review]

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 src/win32/cairo-win32-display-surface.c
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.
Comment 1 Simon 2017-01-13 08:42:25 UTC
I have a similar bug in ruby rcairo.

Full story is available on the rcairo issue :
Comment 2 GitLab Migration User 2018-08-25 13:56:50 UTC
-- GitLab Migration Automatic Message --

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