Description of problem: In the Qt-project online document, QImage is mentioned to be able to read JPEG format. But The program build by mingw32-qt cannot read JPEG image. The function QImageReader::supportedImageFormats() does not returns JPEG. Version-Release number of selected component (if applicable): mingw32-qt-4.8.4-1.fc18 How reproducible: Always failed. Steps to Reproduce: 1. Build the source file below. 2. Execute it on Windows. $ cat main.cc #include <QApplication> #include <QImage> #include <QImageReader> #include <cstdio> int main(int argc, char **argv) { QApplication app(argc, argv); QList<QByteArray> list = QImageReader::supportedImageFormats(); for(int i=0; i<list.size(); i++) { const QByteArray &x = list.at(i); printf("%s\n", (const char*)x.data()); } return 0; } $ cat qimage-jpeg.pro #! /usr/bin/mingw32-qmake-qt4 SOURCES = main.cc CONFIG += console Actual results: bmp pbm pgm png ppm xbm xpm Expected results: bmp gif ico jpeg jpg mng pbm pgm png ppm svg svgz tga tif tiff xbm xpm Additional info: The expected result is the output made by qt-devel-4.8.4-14.fc18.x86_64.
I just tried to reproduce the testcase you provided using wine and mingw32-qt-4.8.4-2.fc19 and here it shows the expected output: $ mingw32-qmake-qt4 qimage-jpeg.pro $ make make -f Makefile.Release make[1]: Entering directory `/home/erik/fedora_mingw_testsuite/trunk/testcases/qt4/qimage' i686-w64-mingw32-g++ -c -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 --param=ssp-buffer-size=4 -fno-keep-inline-dllexport -O2 -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -I'/usr/i686-w64-mingw32/sys-root/mingw/include/QtCore' -I'/usr/i686-w64-mingw32/sys-root/mingw/include/QtGui' -I'/usr/i686-w64-mingw32/sys-root/mingw/include' -I'/usr/i686-w64-mingw32/sys-root/mingw/include/ActiveQt' -I'release' -I'/usr/i686-w64-mingw32/sys-root/mingw/share/qt4/mkspecs/win32-g++-cross' -o release/main.o main.cc i686-w64-mingw32-g++ -g -Wl,-subsystem,console -mthreads -o release/qimage-jpeg.exe release/main.o -L'/usr/i686-w64-mingw32/sys-root/mingw/lib' -lQtGui4 -lQtCore4 make[1]: Leaving directory `/home/erik/fedora_mingw_testsuite/trunk/testcases/qt4/qimage' $ cd release $ wine qimage-jpeg.exe p11-kit: couldn't load module: /usr/lib/pkcs11/p11-kit-trust.so: /usr/lib/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory p11-kit: couldn't load module: /usr/lib/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directory bmp gif ico jpeg jpg mng pbm pgm png ppm svg svgz tga tif tiff xbm xpm I do have to notice that libjpeg-62.dll is in my PATH. Is this library also bundled with your executable?
If I run it on Windows Server 2008 R2 not wine, JPEG is not included. I copied libgcc_s_sjlj-1.dll libjpeg-62.dll libpng15-15.dll libstdc++-6.dll libopenjpeg.dll libturbojpeg.dll QtCore4.dll QtGui4.dll zlib1.dll from /usr/i686-w64-mingw32/sys-root/mingw/bin/ to the directory containing qimage-jpeg.exe. I also confirm that JPEG is included in wine environment and it work as you showed.
Qt has support for optional image formats. These optional image formats are all implemented in special plugin dll's which can be found in /usr/i686-w64-mingw32/sys-root/mingw/lib/qt4/plugins/imageformats. To get JPEG support in Qt you need to bundle qjpeg4.dll which can be found in the mentioned folder along with your application. To make Qt able to detect these optional image formats you need to create a folder called 'imageformats' and put all image format plugins you desire in it. In your case you would end up with this file/directory structure: myapp\qimage-jpeg.exe myapp\libgcc_s_sjlj-1.dll myapp\libjpeg-62.dll myapp\libpng15-15.dll myapp\libstdc++-6.dll myapp\QtCore4.dll myapp\QtGui4.dll myapp\zlib1.dll myapp\imageformats\qjpeg4.dll
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