Copy to a memory image png or bmp

Hello everyone, I have an image assets / stall.png where asset is a directory located under the root of my program. I would like to copy my image in memory starting from img_flip.
This is the code that I wrote:

Code:

---

QImage img;
    img.load(filename);
    if (img.isNull())
    {
        printf( "unable to open image: %s\n", filename );
        return 0;
    }
 
    QImage gldata = QGLWidget::convertToGLFormat(img);
    uchar *pixels = (uint8_t *)gldata.bits();
 
    //vertically flip the image
    int img_size = gldata.width() * gldata.height() * gldata.depth();
    uint8_t *img_flip = new uint8_t[ img_size ];
 
    const int row_width = gldata.width() * gldata.depth();
 
    for( int i = 0; i < gldata.height(); i++ )
        memcpy( img_flip + ( i * row_width ), pixels + ( (gldata.height() - i - 1) * row_width ),  
                                                                                                                         row_width );

---

I must have made a mistake because the execution stops after copying with i = 7.
Can you help me fix my error ?

gldata.depth(); return the size in bit(s), so you will have to use gldata.depth()/8 for size in byte. Also bit depth 1 has to taken are of.

Thanks Santosh Reddy