How to using GIF image for QT ?

Nguyen Thang Phong

QT : 6.7.3
Installer Framework : 4.9
MSVC : 2022
1. Step build QT Static

git clone https://code.qt.io/qt/qt5.git
set PATH=C:\Phong\Libraries\Strawberry\perl\bin;%PATH%
cd qt5
git checkout 6.7.3
perl init-repository --module-subset=qtbase,qtsvg,qtdeclarative,qttools,qt5compat
set INCLUDE=C:\Phong\Libraries\MSVC\VC\Tools\MSVC\14.43.34808\atlmfc\include;%INCLUDE%
C:\Phong\Libraries\MSVC\setup_x64.bat
configure -static -prefix C:\Phong\Libraries\Qt-Static -opensource -confirm-license -qt-libpng -qt-libjpeg -qt-zlib -gif
cmake --build . --parallel
cmake --install . --prefix C:\Phong\Libraries\Qt-Static
2. Step build QT installer framework
git clone https://github.com/qtproject/installer-framework.git
cd installer-framework
git checkout 4.9
C:\Phong\Libraries\MSVC\setup_x64.bat
set PATH=C:\Phong\Libraries\Qt-Static\bin;%PATH%
set LIB=C:\Phong\Libraries\Qt-Static\lib;%LIB%
set INCLUDE=C:\Phong\Libraries\Qt-Static\include;%INCLUDE%
qmake -r
nmake
When using QMovie for GIF image, image not display ?

JonB

@Nguyen-Thang-Phong
Can you display the GIF image in, say, a QLabel rather than a QMovie?

Nguyen Thang Phong

@JonB
m_movie = new QMovie(gif);
m_label->setMovie(m_movie);
m_movie->start();
and add QTPLUGIN += qgif into file .pro
But not display when check using
qDebug() << "supported formats: " << QImageReader::supportedImageFormats();
supported formats: QList("bmp", "pbm", "pgm", "png", "ppm", "xbm", "xpm")

JonB

@Nguyen-Thang-Phong Per https://forum.qt.io/topic/53280/qmovie-gif-and-qrc where is your qgif.dll? Assuming that is still needed for Qt6.

Nguyen Thang Phong

@JonB
I build qt static to custom installer framework is the path plugins/imageformats/qgif.lib, but when using binary creator to build app.exe using QLabel and QMovie but not display image ?

Christian Ehrlicher

See https://doc.qt.io/qt-6/qtplugin.html#Q_IMPORT_PLUGIN and https://doc.qt.io/qt-6/plugins-howto.html#static-plugin on how to use static plugins

Nguyen Thang Phong

@Christian-Ehrlicher @JonB
I added QTPLUSGIN += qgif into installer.pro
After, I build source installer framework done.
But I tested not display GIF image.

Christian Ehrlicher

My post contains two links...

Nguyen Thang Phong

@Christian-Ehrlicher

I tried but not working

Christian Ehrlicher

Then the path you given to QMovie does not exist. Check it

Nguyen Thang Phong

@Christian-Ehrlicher
I using pixmap to assign direct for GIF image but run not appear ?
No away to solution ...

Christian Ehrlicher

Again: Check if the file exists. E.g. with QFile::exists() ...

Nguyen Thang Phong

@Christian-Ehrlicher @JonB

So, check supported image format to print formats bmp,pbm,pgm,png,ppm,xbm,xpm not found gif ?

JonB

I do not know for sure that GIF should appear in supportedImageFormats(), though I agree I would have thought it should.
I suggested earlier that you try to display a GIF as an image on a QLabel, not in a QMovie.
@Christian-Ehrlicher asked you to verify that the path to the GIF file you test really does exist via QFile::exists().

Nguyen Thang Phong

@Christian-Ehrlicher @JonB

I tried add to pixmap

JonB

@Nguyen-Thang-Phong
I do not use resources and I do not know whether that ../..../additonal.qrc path is right.
What does QFile::exists(":/loading.gif") return?
If you place a .gif file in your actual file system and try

qDebug() << QFile::exists("c:/full/path/to/file.gif");
// `label` is some `QLabel *` you have created and is visible in your UI
label->setPixmap(new QPixmap("c:/full/path/to/file.gif"));

(I think the above is right, untested, adjust as necessary) does that work?

Otherwise I guess it is indeed a "static" issue, and only someone like @Christian-Ehrlicher knows what the issue might be.

JoeCFD

@JonB I play a GIF file in a QMovie in a QLabel.

JoeCFD

@Nguyen-Thang-Phong Did you try the following in the pro file?

CONFIG   += static
# For static plugins
static {
    # Include the GIF plugin
    QTPLUGIN += qgif
}

JonB

@JoeCFD said in How to using GIF image for QT ?:

@JonB I play a GIF file in a QMovie in a QLabel.

I know you do. And I have suggested removing the QMovie level, to eliminate that, by assigning a created QPixmap from a GIF file directly to the QLabel, which can display GIF images, to see if that works. And I have also suggested using an external, actual GIF file instead of one in a Qt resource, and various QFile::exists() checks to verify the file or resource can be found. Up to you whether you do these things, but they check for various problems. It may well be that your issue is static-related and these will not show anything wrong, but it is what I would do before proceeding.

JoeCFD

@JonB It is not a QMovie issue. May be better to try to make his code to run dynamically with gif plugin first. And then build his app with gif plugin statically.