Qt crash at drawImage

[Chaitra Sridhar]

Hi,
I am relatively new to Qt programming. I have hit a dead end and seek help.
I am running Qt in Linux.
Following is my code -

QPainter painter;
    QImage rcptImage(216, 560, QImage::Format_Mono);
 
    painter.begin(&rcptImage);
 
    QImage img("./test1.bmp");
    QImage::Format f = img.format();
    printf("%d\n", f);
    uchar* tempData = img.bits();
 
   QImage img1(img.bits(), 320, 240, QImage::Format_Mono);
   QImage::Format f1 = img1.format();
 
    painter.drawImage(QPoint(10,10), img1);
 
    painter.end();
 
    rcptImage.save("/home/chaitras/output1.bmp");

QPainter painter;
    QImage rcptImage(216, 560, QImage::Format_Mono);

    painter.begin(&rcptImage);

    QImage img("./test1.bmp");
    QImage::Format f = img.format();
    printf("%d\n", f);
    uchar* tempData = img.bits();

   QImage img1(img.bits(), 320, 240, QImage::Format_Mono);
   QImage::Format f1 = img1.format();

    painter.drawImage(QPoint(10,10), img1);

    painter.end();

    rcptImage.save("/home/chaitras/output1.bmp");

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Program is crashing at "painter.drawImage(QPoint(10,10), img1);"

test1.bmp is a 1bpp image - 360 x 260 x 1. Attached the image.

I am trying to reading the bits from "img" and create a new image img1 using these bits.
And using img1, which results in a crash.

Stacktrace is pointing to a function "convertIndexedToARGB32PM Line 95"


convertIndexedToARGB32PM Line 95
blend_untransformed_generic Line 4264
fillRect_normalized Line 1491
QRasterPaintEngine::drawImage Line 2187
QPainter::drawImage Line 5356
QPainter::drawImage qpainter.h Line 852
main


Any help on this would be appreciated.

[d_stranz]

So none of the sizes of your images match. One is 216 x 560, one is 320 x 240, another is 360 x 260. What do you think will happen if you try to load one image of 360 x 260 into another image of 320 x 240, and then try to paint that into an image of 216 x 560? Do you expect QImage and QPainter to try to understand what you really want to do and just do it for you despite the fact that nothing matches?