QImage::load() returning NULL in embedded qt

kevinjjames

Hi,

I am trying to load a BMP image on an ARM platform. QImage::load() works well on my host for a sample program., but the same program when run on ARM gives NULL. Any suggestion what could be wrong here?

I have two separate copies of Qt. One configured for amd_64(host) and the other configured as embedded for ARM platform(for cross compiling).

Thanks,
Kevin

SGaist

Hi and welcome to devnet,

Did you check that the arm version has all plugins (specially imageformats) deployed properly ?

kevinjjames

@SGaist

Thanks for the reply.

Sorry, how can I check if the imageformats are properly deployed or not? I have disabled almost all the image supports using -no-libpng etc and I am using -prefix-install for a local build.

Are the image libraries like say libqjpeg.so need to be deployed on the ARM platform if I want to load a BMP image?

-Kevin

SGaist

You should find them in the plugins/imageformats folder from your Qt installation

kevinjjames

Yes, I can see certain .so files specific to various image files like libqjpeg.so in my embedded Qt build. But are those necessary for a BMP file? I cannot find say, libqbmp.so in plugins/imageformats folder. Is there any particular flag which I should pass explicitly to configure qt to support BMP?

kevinjjames

Hi,

Any ideas?
If I copy the plugin folder to my arm platform(from embedded-arm build) and change the QT_PLUGIN_PATH; will that solve the issue?

As I have said I am using a BMP image file. I can try loading a JPEG image using libqjpeg.so. But still what is the right way to load a BMP file?

Thanks,
Kevin

SGaist

Just had a silly idea: what path are you using to get the image ? Are you sure the file is there ?

kevinjjames

I am using the path "/mnt/<image>.bmp". Both the application and the image are on a pendrive(FAT32). I mount the pendrive on my target platform at "/mnt" and run it from there.

Even tried using only "<image>.bmp" as the path since both the application and the image are in the same location; but load() returned NULL. :(

SGaist

So you have read access to image.bmp ?

kevinjjames

@SGaist

I think my embedded build qconfig had the macro QT_NO_IMAGEFORMAT_BMP defined. Trying to build the Qt libraries after undefining the macro.