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List: cairo-bugs
Subject: [cairo-bugs] [Bug 42421] New: It looks like Clipping of cairo
From: bugzilla-daemon () freedesktop ! org
Date: 2011-10-31 11:52:02
Message-ID: bug-42421-4039 () http ! bugs ! freedesktop ! org/
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https://bugs.freedesktop.org/show_bug.cgi?id=42421
Bug #: 42421
Summary: It looks like Clipping of cairo doesn't work
correctly.
Classification: Unclassified
Product: cairo
Version: 1.10.3
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: critical
Priority: medium
Component: image backend
AssignedTo: cworth@cworth.org
ReportedBy: seongwon79@hanafos.com
QAContact: cairo-bugs@cairographics.org
Created attachment 52943
--> https://bugs.freedesktop.org/attachment.cgi?id=52943
test code and result files
Hi,
I make test app which it contains 4 clips and 1 path and call cairo_fill() on
cairo 1.11.3 (upstream latest)
Each clips may have different AA option and path has CAIRO_ANTIALIAS_DEFAULT.
In this scenario clipping doesn't work correctly.
If I change the AA of path to CAIRO_ANTIALIAS_NONE clipping works well.
As I analysis of cairo clip_and_composite_boxes() in cairo-spans-compositor.c
has problem.
Even I set clip on application, composite_needs_clip() in composite_boxes()
returns FALSE and call scan converter without clip information.
I attached test code with png files.
Thanks.
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