QGraphicsView (using int array) advice and display help

[enricong]

I receive image data from an API as an int pointer to an array laid out in memory like a C array x[i][j][k]

What would be the recommended way to display this image in a graphics view?
I am currently using a nested loop to loop through the entire array and "QImage::setPixel(x,y,Qrgb)" to set every the color of every pixel. Then I turn the QImage into a Qpixmap, add it to a GraphicsScene, then link it to a GraphicsView.

[ChrisW67]

What would be the recommended way to display this image in a graphics view?

We have no idea what your three-dimensional integer array data represents or what a logical way to display it would be. How does a 3d array represent image data? Is it a stack of multiple images?

I am currently using a nested loop to loop through the entire array and "QImage::setPixel(x,y,Qrgb)" to set every the color of every pixel.

Where do x, y, and the arguments for the colour come from in the three-dimensional array?

[enricong]

Sorry, I should have provided more info

it is an int array of width,height,color
color is a RGB triplet of three integers (0-255)

for (int i=0; i<height; i++)
  for (int j=0; j<width; j++)
        {
            int pix = i*width*3+j*3;
            img->setPixel(i,j,qRgb(data[pix],data[pix+1],data[pix+2]));
        }

for (int i=0; i<height; i++)
  for (int j=0; j<width; j++)
        {
            int pix = i*width*3+j*3;
            img->setPixel(i,j,qRgb(data[pix],data[pix+1],data[pix+2]));
        }

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The above codes works but I don't know if there is a better way to do this

[ChrisW67]

If the data is an array of ints (i.e. 4 byte numbers) then there's no better way I am aware of.

If the array is actually of bytes (unsigned char) then:

// Some test data: grey gradient 64x64 pixel image
uchar data[64 * 64 * 3];
int offset = 0;
for (int i = 0; i < 64; ++i) {
    for (int j = 0; j < 64; ++j) {
        data[offset++] = (i+j)*2;
        data[offset++] = (i+j)*2;
        data[offset++] = (i+j)*2;
    }
}
 
// Create an image from that
QImage image(data, 64, 64, 64 * 3, QImage::Format_RGB888);
image.save("test.png");

// Some test data: grey gradient 64x64 pixel image
uchar data[64 * 64 * 3];
int offset = 0;
for (int i = 0; i < 64; ++i) {
    for (int j = 0; j < 64; ++j) {
        data[offset++] = (i+j)*2;
        data[offset++] = (i+j)*2;
        data[offset++] = (i+j)*2;
    }
}

// Create an image from that
QImage image(data, 64, 64, 64 * 3, QImage::Format_RGB888);
image.save("test.png");

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works.

[enricong]

I did not realize that is what RGB888 meant. I am able to request the size of the int so I was able to put it in a uchar.

Thanks