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Custom image plugin testing difficulties

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  • C Offline
    C Offline
    ChrisM87
    wrote on last edited by ChrisM87
    #3

    Oops, instantiate... okay, my bad. Thanks

    EDIT: Still doesn't work, and QT_DEBUG_PLUGINS shows normal results:

    Found metadata in lib /home/admin/Documents/Qt-extra/imageformats/tim/timtest/imageformats/libtim.so, metadata=
    {
    "IID": "TimPlugin",
    "MetaData": {
    "Keys": [
    "tim"
    ]
    },
    "className": "TimPlugin",
    "debug": true,
    "version": 328705
    }

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #4

      The most simple is to copy your plugin in Qt's plugin folder or you can tell your application to search in the folder containing your plugin with QCoreApplication::addLibraryPath

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • C Offline
        C Offline
        ChrisM87
        wrote on last edited by
        #5

        Well as I showed above, with the QT_DEBUG_PLUGINS variable set, the program is picking it up. However, it still refuses to load it. Is the IID or keys array invalid? I figured if it was choking on the plugin code itself, it would either error, segfault, or spit out a corrupt PNG.

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #6

          Without seeing your code, it's pretty much Crystal Ball Debugging (™) I can't say

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • C Offline
            C Offline
            ChrisM87
            wrote on last edited by ChrisM87
            #7

            Well, I had posted my code in the original post. However, my handler class was tweaked a bit after spotting some errors, so here's the updated class code:

            EDIT: I did a few tests on QImageReader that should fail with unsupported format error, but I keep getting "unknown error." I attempted to load my ".pro" qmake file to see which error it would get but still unknown error. However, I compiled qtraw from Github, dropped it into an imageformats subdirectory and it ran fine.

            #include <QDataStream>
            #include <QImage>
            #include <QIODevice>
            #include <QtGlobal>
            #include <QtMath>
            #include <QVariant>
            #include <QVector>
            #include <QImageIOHandler>
            
            class TimHandler final: public QImageIOHandler
            {
            public:
            	bool canRead() const;
            	bool read(QImage *img);
            	QVariant option(ImageOption op) const override;
            	bool supportsOption(ImageOption op) const override;
            };
            
            #define BIT16 0.121568627451
            
            bool TimHandler::canRead() const
            {
            	return device()->peek(4) == "\x10\x0\x0\x0";
            }
            
            static inline quint32 rgba5551ToArgb32(quint16 c)
            {
            	quint32 r = ((c & 0xf800) >> 11) / BIT16;
            	quint32 g = ((c & 0x7c0) >> 6) / BIT16;
            	quint32 b = ((c & 0x3e) >> 1) / BIT16;
            	quint32 a = c & 1 ? 0 : 0xff;
            	
            	return ((a << 24) | (r << 16) | (g << 8) | b);
            }
            
            bool TimHandler::read(QImage *img)
            {
            	QDataStream ds(device());
            	ds.setByteOrder(QDataStream::LittleEndian);
            	quint32 magic, flags;
            	
            	ds >> magic >> flags;
            	if (ds.status() != QDataStream::Ok || magic != 0x10)
            		return false;
            	bool hasClut = flags & 0x8 ? true : false;
            	quint8 pxlMode = flags & 0x7;
            	
            	quint8 bpp;
            	switch (pxlMode)
            	{
            		case 0: bpp = 4; break;
            		case 1: bpp = 8; break;
            		case 2: bpp = 16; break;
            		case 3: bpp = 24; break;
            		default: bpp = 4;
            	}
            	
            	QVector<QRgb> clut;
            	if (hasClut)
            	{
            		quint32 colors, npals;
            		ds.skipRawData(12);
            		ds >> colors >> npals;
            		
            		for (quint16 i = 0; i < (colors*npals); i++)
            		{
            			quint16 c;
            			ds >> c;
            			clut.append(rgba5551ToArgb32(c));
            		}
            	}
            	
            	ds.skipRawData(8);
            	quint16 w, h;
            	ds >> w >> h;
            	w = (w*16)/bpp;
            	
            	if (img) delete img;
            	img = new QImage(w, h, QImage::Format_ARGB32);
            	if (hasClut) img->setColorTable(clut);
            	
            	for (quint16 y = 0; y < h; y++)
            	{
            		for (quint16 x = 0; x < w; x++)
            		{
            			switch (bpp)
            			{
            				case 4:
            				{
            					quint8 p;
            					ds >> p;
            					img->setPixel(x++, y, p & 0xf0);
            					img->setPixel(x, y, p & 0xf);
            				}
            					break;
            				case 8:
            				{
            					quint8 p;
            					ds >> p;
            					img->setPixel(x, y, p);
            				}
            					break;
            				case 16:
            				{
            					quint16 p;
            					ds >> p;
            					img->setPixel(x, y, rgba5551ToArgb32(p));
            				}
            					break;
            			}
            		}
            	}
            	
            	return true;
            }
            
            bool TimHandler::supportsOption(ImageOption op) const
            {
            	switch (op)
            	{
            		case Size:
            			return true;
            		default:
            			return false;
            	}
            }
            
            QVariant TimHandler::option(ImageOption op) const
            {
            	switch (op)
            	{
            		case Size:
            		{
            			quint32 size;
            			quint16 w, h;
            			QDataStream ds(device());
            			ds.skipRawData(8);
            			ds >> size;
            			size -= 4; // 12 - image size - palette x - palette y
            			ds.skipRawData(size);
            			ds >> w >> h;
            			return QSize(w, h);
            		}
            		default:
            			return QVariant();
            	}
            }
            
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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #8

              Sorry about the code part, I had a problem when I read it first and only saw the end of it.
              What about a more simple json ?

              {
                  "Keys": [ "tim" ],
                  "MimeTypes": [ "image/x-tim" ]
              }
              
              

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • C Offline
                C Offline
                ChrisM87
                wrote on last edited by ChrisM87
                #9

                Well, while I could try that, I don't know if that's the mime type for TIM files. A Google search doesn't help either. My examination of qtraw shows that it too lacks a mime type entry. Thus, I thought it was unnecessary.

                EDIT: tried it anyway, still nothing

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  Just thought of something… Your plugin code is correct but:

                  img.load("0025.tim", "tim");

                  "0025.tim" is a relative path, is that image in the same folder as your executable ? You should rather give the full path to it.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • C Offline
                    C Offline
                    ChrisM87
                    wrote on last edited by ChrisM87
                    #11

                    Same directory, yep. Though of course in a real world scenario this would be different.

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #12

                      I forgot a correction I made:

                      Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "tim.json")

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • C Offline
                        C Offline
                        ChrisM87
                        wrote on last edited by
                        #13

                        Yeah, I changed it to that in my progress trying to fix it, but no go. I booted up QtCreator and created a new project from Qt plugin template but I see nothing unusual in comparison with my code, aside from the constructor with QObject* parameter, which I skipped in my code because I saw no point for an empty constructor/destructor.

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                        • C Offline
                          C Offline
                          ChrisM87
                          wrote on last edited by
                          #14

                          So after a little tinkering, I got qmake to generate main.moc which I thought was needed, but I'm still having issues with the plugin not being discovered. Additionally, the RGBA5551 conversion function was incorrect, which I fixed, but that shouldn't be the make-or-break factor.

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #15

                            Not being discovered or not loaded ? Did you put your plugin in a imageformats subfolder ?

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                            • C Offline
                              C Offline
                              ChrisM87
                              wrote on last edited by ChrisM87
                              #16

                              Yep. Even set target.path in my .pro file thinking that was the issue. Qt seems very nitpicky.

                              EDIT: Just debugged again, found this gem of an error:

                              QLibraryPrivate::loadPlugin failed on "/home/admin/Documents/Qt-extra/imageformats/qtim/timtest/imageformats/libqtim.so" : "Cannot load library /home/admin/Documents/Qt-extra/imageformats/qtim/timtest/imageformats/libqtim.so: (/home/admin/Documents/Qt-extra/imageformats/qtim/timtest/imageformats/libqtim.so: undefined symbol: _ZN11QTimHandler9setOptionEN15QImageIOHandler11ImageOptionERK8QVariant)"
                              
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                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #17

                                Which version of Qt are you using ?
                                What happens if you try to load it by hand using QLibrary ?

                                Interested in AI ? www.idiap.ch
                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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