#378 ‘class GLArea’ has no member named ‘devicePixelRatio' in glarea.cpp

[Gregory Smith]

Detailed compiler error is below. gcc 4.8.1, QT4.8.4 under ubuntu
Presumably I have incompatible versions, across meshlab and vcglib? Both are latest trunk:

 meshlab: svn://svn.code.sf.net/p/meshlab/code/trunk/meshlab  -r 6272
 vcglib: svn://svn.code.sf.net/p/vcg/code/trunk/vcglib  -r 5054

Is there a combination that is known to work?
The reason I'm doing this build is that ubuntu distribution gives me meshlab 1.3.0, and the distribution kit for 1.3.2 "Download MeshLabSrc_AllInc_v132.tgz" has a strange problem in vcglib (and a persistent one, as reported in tickets 292, 308,354 - at least the trunk version of vcglib does not seem to have this issue).

glarea.cpp: In member function ‘void GLArea::setView()’:
glarea.cpp:1378:41: error: ‘class GLArea’ has no member named ‘devicePixelRatio’
     glViewport(0,0, this->width()*this->devicePixelRatio(),this->height()*this->devicePixelRatio());
                                         ^
glarea.cpp:1378:81: error: ‘class GLArea’ has no member named ‘devicePixelRatio’
     glViewport(0,0, this->width()*this->devicePixelRatio(),this->height()*this->devicePixelRatio());

[Matthew Ewer]

I'm having the same problem. It may be related to Qt somehow - glarea.cpp is a subclass of QGLWidget. Not sure what to do about it yet, though.

[Viorik]

Hi,
I have Qt4.8.1, and I wanted to install Meshlab 1.3.2 for the "Mutual Information" filter. However, the latest trunk in svn is 1.3.3, which I didn't manage to compile; I got the same error as the one mentioned above, and I don't understand what is happening. Clearly, it is a compatibility problem with the Qt version. devicePixelRatio seems to be defined in QWindow, which was introduced in Qt5, so Meshlab 1.3.3 needs maybe Qt5? Anyway, I tried to compile after installing Qt5, but then it complained about a missing QAction, which existed in Qt4, but not anymore in Qt5. So I don't understand the problem.
Luckily, I managed to compile MeshLabSrc_AllInc_v132.tgz, (using the vcglib from the package), in command line (not with Qtcreator). There are two parts in the compilation, first compile external libraries, and then meshlab. It worked for me.
I am curious though about the 1.3.3 issue.

cheers,
v.

[Rosewelltech]

Based on this description -> http://qt-project.org/doc/qt-4.8/qwidget.html#width-prop

"By default, this property contains a value that depends on the user's platform and screen geometry."

Change: glViewport(0,0, this->width()this->devicePixelRatio(),this->height()this->devicePixelRatio());

To: glViewport(0,0, this->width(),this->height());

This change does not seem to affect the application and will allow it to compile. I do not know much about the QT libs, so I am unsure of the authors original intention, but at least you will be able to compile from SVN.

Now kick back, relax, and download Monkey! for Android 2.2+ -> http://tinyurl.com/qzheslg

[Guido Ranzuglia]

You should compile MeshLab with a Qt version >= 5.0. This change has
been introduced to support retina display.

Il 13/02/2014 21:35, Rosewelltech ha scritto:

Based on this description ->
http://qt-project.org/doc/qt-4.8/qwidget.html#width-prop

"By default, this property contains a value that depends on the user's
platform and screen geometry."

Change: glViewport(0,0,
this->width()/this->devicePixelRatio(),this->height()/this->devicePixelRatio());

To: glViewport(0,0, this->width(),this->height());

This change does not seem to affect the application and will allow it
to compile. I do not know much about the QT libs, so I am unsure of
the authors original intention, but at least you will be able to
compile from SVN.

Now kick back, relax, and download Monkey! for Android 2.2+ ->
http://tinyurl.com/qzheslg

---

[bugs:#378] http://sourceforge.net/p/meshlab/bugs/378/ ‘class
GLArea’ has no member named ‘devicePixelRatio' in glarea.cpp

Status: open
Created: Fri Dec 27, 2013 10:24 PM UTC by Gregory Smith
Last Updated: Thu Jan 16, 2014 09:33 PM UTC
Owner: nobody

Detailed compiler error is below. gcc 4.8.1, QT4.8.4 under ubuntu
Presumably I have incompatible versions, across meshlab and vcglib?
Both are latest trunk:

meshlab: svn://svn.code.sf.net/p/meshlab/code/trunk/meshlab -r 6272
vcglib: svn://svn.code.sf.net/p/vcg/code/trunk/vcglib -r 5054

Is there a combination that is known to work?
The reason I'm doing this build is that ubuntu distribution gives me
meshlab 1.3.0, and the distribution kit for 1.3.2 "Download
MeshLabSrc_AllInc_v132.tgz" has a strange problem in vcglib (and a
persistent one, as reported in tickets 292, 308,354 - at least the
trunk version of vcglib does not seem to have this issue).

glarea.cpp: In member function ‘void GLArea::setView()’:
glarea.cpp:1378:41: error: ‘class GLArea’ has no member named ‘devicePixelRatio’
glViewport(0,0, this->width()this->devicePixelRatio(),this->height()this->devicePixelRatio());
^
glarea.cpp:1378:81: error: ‘class GLArea’ has no member named ‘devicePixelRatio’
glViewport(0,0, this->width()this->devicePixelRatio(),this->height()this->devicePixelRatio());

---

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[Paolo Cignoni]

Closed.
https://sourceforge.net/p/meshlab/code/6299/

It was a leftover in the process of adding nice retina display support using qt5 features.