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Bug 356442

Summary:

GraphicsConfiguration: setAntialias() causes drawOval() inconsistency

Product:

[Eclipse Project] Platform

Reporter:

Matthias Wienand <matthias.wienand>

Component:

SWT

Assignee:

Platform-SWT-Inbox <platform-swt-inbox>

Status:

CLOSED WONTFIX

QA Contact:

Severity:

normal

Priority:

CC:

akurtakov, arunkumar.thondapu, eclipse.felipe, ericwill, jolkdarr, nyssen, remy.suen, Silenio_Quarti

Version:

3.7

Keywords:

triaged

Target Milestone:

---

Hardware:

OS:

Linux

Whiteboard:

stalebug

Attachments:

Description	Flags
Code snippet to test the described behaviour	none
Code snippet to test the described behaviour	none
Resulting application window under Ubuntu	none
Resulting application window under Mac	none

Description Matthias Wienand

2011-09-01 05:13:03 EDT

Build Identifier: I20110613-1736

The appended code-snippet produces different results for Linux and Mac. If I run it on my Ubuntu system with the setAntialias() call commented out, the empty oval is not drawn, but the others are. If I enable the setAntialias() call, no ovals are drawn. The same code works on Mac as expected, that is, the empty oval is not drawn, but the other three are.

The value that is given to setAntialias(value) is not important.

Reproducible: Always

Steps to Reproduce:
1. Start the attached code snippet with the setAntialias() call in it.
2. Start the attached code snippet with the setAntialias() call commented out.

Comment 1 Matthias Wienand

2011-09-01 05:15:43 EDT

Created attachment 202595 [details]
Code snippet to test the described behaviour

Comment 2 Matthias Wienand

2011-09-01 11:43:25 EDT

Created attachment 202609 [details]
Code snippet to test the described behaviour

Comment 3 Matthias Wienand

2011-09-01 11:47:41 EDT

Created attachment 202610 [details]
Resulting application window under Ubuntu

Comment 4 Matthias Wienand

2011-09-01 11:48:18 EDT

Created attachment 202611 [details]
Resulting application window under Mac

Comment 5 Felipe Heidrich

2011-09-06 10:10:09 EDT

Arun, can you please investigate this problem?

Comment 6 Arun Thondapu

2011-09-12 09:25:22 EDT

I figured that the SWT code on Linux makes use of Cairo library calls to draw when setAntialias() is invoked whereas it directly uses GDK API in the other case.
I'm still trying to understand why the Cairo library calls seem to be failing.
Felipe, do you have any idea why this could happen?

Thanks!

Comment 7 B. Djoudi

2015-07-13 07:04:06 EDT

Hi all

With: e.gc.fillOval(235, 5, 200, 1);
Ovals get drawn.

Something is persistently wrong with zero-pixel heighs for ovals (and maybe other shapes?).

Comment 8 Alexander Kurtakov

2019-01-30 08:55:52 EST

Running on Fedora 29 ends up with:

(SWT:16924): Gtk-WARNING **: 15:55:06.102: drawing failure for widget 'SwtFixed': invalid matrix (not invertible)

(SWT:16924): Gtk-WARNING **: 15:55:06.102: drawing failure for widget 'GtkScrolledWindow': invalid matrix (not invertible)

(SWT:16924): Gtk-WARNING **: 15:55:06.102: drawing failure for widget 'GtkBox': invalid matrix (not invertible)

(SWT:16924): Gtk-WARNING **: 15:55:06.102: drawing failure for widget 'GtkWindow': invalid matrix (not invertible)

(SWT:16924): Gtk-WARNING **: 15:55:06.154: drawing failure for widget 'SwtFixed': invalid matrix (not invertible)

(SWT:16924): Gtk-WARNING **: 15:55:06.154: drawing failure for widget 'GtkScrolledWindow': invalid matrix (not invertible)

(SWT:16924): Gtk-WARNING **: 15:55:06.154: drawing failure for widget 'GtkBox': invalid matrix (not invertible)

(SWT:16924): Gtk-WARNING **: 15:55:06.154: drawing failure for widget 'GtkWindow': invalid matrix (not invertible)

Comment 9 Eric Williams

2019-01-30 16:01:14 EST

Looks like some bug in our Cairo drawing, toggling anti-alias does nothing.

Comment 10 Eclipse Genie

2021-01-20 05:23:45 EST

This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. As such, we're closing this bug.

If you have further information on the current state of the bug, please add it and reopen this bug. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant.

--
The automated Eclipse Genie.